Machine tool equipment electrical troubleshooting

 Machine tool equipment failure phenomena in terms of electrical performance, sometimes sometimes in the aspect of mechanical performance, even in the aspect of hydraulic performance. When we to repair machine tool equipment failure, as long as the master machine tool equipment electrical troubleshooting methods commonly used, the machine tool equipment of mechanical and electrical contact fully understand, electricalmotor1.blogspot.com find out action principle, often can successfully troubleshooting. Repairers are divided into some factories electrical maintenance electrical motor and mechanical maintenance man, when the machine tool equipment failure is often confuse the responsibility of the electrical maintenance man or mechanical maintenance responsibility, caused the phenomenon of wrangling with each other. Such as a few years ago in a new plant old radial drilling machine appeared the rocker arm and the failure of the mast lock is not tight, cause can't normal drilling. 

The drill machine lock system is: mechanical, hydraulic + locking process of it is by the first lock motor diesel generating driven initially lock locking mechanism, reach place, again by the hydraulic institute for further lock rocker arm. Began to suspect that is locking mechanism caused by mechanical wear lock is not tight. Will arrange mechanical maintenance man to repair, but they cannot solve the problem. Then arrange electric mechanic repairs and they said lock motor function also drives the locking mechanism for locking action, is not their responsibility; Back wheel mechanical maintenance technician for maintenance, check the hydraulic mechanism and locking mechanism are no abnormal phenomenon. Finally careful maintenance maintenance electrician's turn again, only to find that is due to mechanical locking process not to switch the collision. Because only the collision to the position switch contacts, the corresponding 220v ac electric motors electromagnetic valve electric action, hydraulic mechanism to further lock rocker arm. Adjust the position of the position switch failure to get out. As a maintenance electrician, machine tool equipment of mechanical and electrical contact to fully understand, find out action principle, in order to improve the work efficiency and ensure the quality of maintenance. I, the author discuss electrical troubleshooting methods commonly used machine tool equipment.

Why low voltage winding of transformer in the inside,and high voltage winding in the outside?

 The arrangement of the high and acmotor2.blogspot.com low voltage transformer,it is decided by many factors.But for most of the transformer,low level around the layout in the high voltage winding is put inside.This is mainly from the insulation into consideration.In theory,no matter how high or low voltage windings to decorate,can be variable pressure role.But because the iron core transformer is grounded,due to the single phase generator low voltage winding is close to the core,from the perspective of insulation easy to do.If the high voltage winding is close to the core,is due to the high voltage winding voltage is very high,to meet the insulation requirements,requires very of insulation materials and the insulation of the large distance.Such not only increases the volume of small electric motors the winding,and waste of the insulating material.Moreover,as a result of the transformer voltage regulation is electrical motor to rely on change of the high voltage winding tap,namely change the number of turns,so the high voltage winding is placed in the low voltage winding outside,lead more easily also.

Pump and fan - displacement

Pump and fan is to use plus can denier conveying fluid fluid machinery. They are widely used in gas and heating and ventilation. According to the working principle of pump and fan, usually they electrical motor can be classified asynchronous motor as follows: Positive displacement pump and fan in operation, the mechanical work within the volume change constantly, and motor run capacitor suction or discharge fluid. According to its different structures, and can be divided into; 1. Reciprocating: this machine through the piston within the cylinder of the reciprocating function make the cylinder contents changed repeatedly, with suction and discharge fluid, such as piston pump, piston pump), etc.; 2. Rotary: chassis within the rotor rotates, or rotating parts working volume change between rotor acmotortrading.blogspot.com and housing, so as to the suction and discharge fluid, such as gear pump, gear pump), screw pump, screw pump), etc.

The inverter no-load current is greater than the load current

A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon.In the process of commissioning,occasionally with current clip-on table test about the three phase output current of frequency converter,more found an amazing phenomenon! The station frequency converter input and output current is completely out of proportion,there is a difference of more than 10 times! 40 electrical motor a current in the output,the input current for several amperes,hardly measured;In 100 a current output,measured input current is only 8 a here! Strange ah,do not conform to the law of conservation of energy.100 a output current change out from?!Like a leaky pipe,into the water,1 and motor run capacitor out 10 water,ShuiGuanZi cannot change water inside.As we all know,in general,the inverter input current is always less than the output current.

The reason for the dc circuit of energy storage capacitor,as if on the motor end installed a ark of reactive power compensation.When inverter no load or light load,part electricalmotor1.blogspot.com is provided by energy storage capacitor current to the load,reduce inverter current from the power grid.And as the increase of load,the input current in proportion to increase,when input rated load,frequency converter input current and output current should be nearly equal.Such as when the output of 40 year input took only a few amp;Output is 100 a,the input current has amounted to 70 a.The output current of 140 a,the ac induction motor input current is almost reached this value.Under normal circumstances,there are differences between the input and output current,but won't produce differences such as the aforementioned gaps.Huge difference made me wonder if measuring instrument is broken.In the table,measure it again,still same result.

General converter electrical engineer to teach you the overcurrent

General converter electrical engineer to teach you the overcurrent protection and treatment methods Overcurrent protection function of the frequency converter is a very important role in the frequency converter,the following introduce you to the cause of the over current and processing method Frequency converter in the overcurrent protection object refers to with paroxysmal qualitative,peak current,exceeds the permissible value of frequency converter.As a result of the inverter device overload ability is poor,so frequency converter overcurrent protection is a vital link,so far has been very perfect.(1) the cause of the over current A.over current work The current system appeared in the process of work.The reason for this is roughly from the following aspects: A) motor encounter impact load or drive mechanism to the sudden increase of motor current phenomenon of "stuck".B) inverter output short-circuit,such as the connecting line between the output to the motor motor internal short circuit or short circuit,etc.C) inverter itself is not normal work,such as two of the same bridge arm in inverter bridge inverter device in the process of alternating work abnormal.For example due to environment temperature is too high,or aging,the inverter device itself to change the parameters of the inverter device,cause in the process of alternating,a device has been conducting,and another device but also in the future and shut off,causing the same bridge arm of the upper and lower two parts of "straight",the dc voltage between the positive and negative in the short circuit state.

B.over current acc When the load of the large inertia,and set up time and too short,means in the process of advance,the working efficiency of the converter rise too fast,the synchronous speed of the motor because of the large inertia load and couldn't keep up with,and the result is acc current is too big.induction motor price C.over current slow down When the load of the large inertia,and slow down the time set too short,can also cause overcurrent.Because of the slow down,the time is too short,synchronous speed drops rapidly,due to the load and the motor rotor inertia is big,still maintain a high speed,then the same can be the speed of the rotor winding cutting lines of magnetic force is too big and over current generation.(2).Treatment methods A -.When starting A liter of tripping speed,this is very serious phenomenon over current,major inspection (1).Working machinery have stuck (2).Load side if there is any short circuit,check over the ground by megohmmeter for short motor fan circuit (3).The inverter power module if there is any damage (4).The starting torque of the motor is too small,the drag system turns up B.starting without tripping immediately,and tripping in the operation process,the main check: (1).Set up time is too short,longer acceleration time (2).Deceleration time setting is too short,longer deceleration time (3).Torque compensation (u/f ratio) set too big,cause the low frequency time load current is too large (4).Improper electronic thermal relay setting,current action set is too small,misoperation caused by frequency converter

Machine tool equipment electrical troubleshooting - analysis of the failure

Prior to treatment failure,the structure of each part of the electrical equipment action principle,adjusting method and the connection between the parts of electrical equipment,should be a comprehensive understanding,know fairly well.Machine fault,performance can be divided into electrical motor two categories: one is equipment asynchronous motor cannot be specified action,or can not meet the prescribed performance index;Equipment appeared not is the second action,or should not have appeared.For the former,should from the principle analysis on motor run capacitor equipment to set and achieve performance indicators shall meet the conditions,check whether all meet these conditions,find does not meet the conditions and reason.

For the latter,should analysis the fault movement to meet the conditions,and check the electricalmotor1.blogspot.com time those who should not have the conditions,to find out the cause of the false action.All in all,starting from equipment action principle analysis,first find the fault of large range,and then check step by step,from coarse to fine,until we finally found the fault point,and ruled out.For some failure phenomena,not simply for processing,parts should be according to the occurrence,the reasons of the analysis,through the test step by step,to determine the problem,after troubleshooting again electrify test.Don't be reckless,extend the fault,or cause personal and equipment accident.

STB high performance permanent magnet synchronous servo motor

(H) series product categories:low speed permanent magnet generator numerical control system,the feature-motor and servo motor drive-product parameters:Product brand:other product overview:compared with induction servo motor,synchronous servo motor has higher dynamic performance,more energy-efficient,and better Low speed torque characteristic and control characteristic,guides the technological change in the field of industrial machine,in order to comply with the demand of the market,fu tian motor in full Research of the customer's requirements,analysis,product development trends,and fully study the international first-class product technology,on the basis of developed STB and STH series big moment Servo synchronous motor series,production enterprises:Shanghai fu tian motor manufacturing co.,LTD.Product advantage:with the technology of industrial machine from all walks of life Upgrading,more and electric motor cooling fan more ordered its main power motor satisfy the premise of powerful driving moment,but also more rapid dynamic response ability and high precision .

Ability,to improve the automation of machine function,improve the efficiency and capacity of the machine work,and to promote the quality of the product,in this case,a For the combination of torque and servo power requirements type wholesalemotor.blogspot.com servo motors are produced.Spatially-integrated SVS,STB (H) series,motor is suitable for such a demand of electricity Machine type products,under the rated speed,synchronous series products compared to the STB (H) series of products with tis servo characteristics,but in the weak magnetic speed Period,the characteristics of the STB (H) series of products is superior to synchronous motor series.Compared with induction servo motor,synchronous servo motor has higher dynamic performance,More energy-efficient and more excellent low-speed torque characteristic and control characteristic,is to guide the technological change in the field of industrial machine,in order to comply with the demand of the market,Fu tian motor in investigating the development trend of customer requirements,analysis of products,and fully study the international first-class product technology,on the basis of developed STB and STH Series of large torque servo synchronous motor series,emphasize on designed high reliability and high performance.

Electrical engineer for the selection of step motor

Stepper motor can transform electrical pulse signal into angular displacement or linear displacement.In the range of the rated power of the motor speed depends only on the pulse signal frequency and pulse number of control,and not affected by load change,coupled with step motor characteristics of cumulative error is small,in areas such as speed,position with stepper motor to control becomes simpler.Stepper motor three kinds,mainly is the hybrid stepping motor is widely used.When choosing a stepper motor,must pay attention to the following parameters as the manufacturer (are supplied with the motor):Step 1) from the Angle of: after receiving a step pulse motor rotation Angle.The actual interval Angle and fine fractions of the drive.Generally the precision of the stepper motor to step away from the Angle of 3-5%,not cumulative.

2) number: the inside of the motor coil set number.Step phase number is different,is apart from the different Angle.If using subdivision driver,'phase number does not make sense: change the fine fraction can change electric motor cooling fan interval Angle.3) keep the torque: also called the largest static torque.Refers to the rated power flow speed is zero,the external force force needed for the rotor rotational torque.Keep the torque has nothing to do with the drive voltage and drive power supply,etc.Stepper motor at low speed torque close to holding torque.As a result of the stepper motor output torque and power increases with the speed and constantly changing,so keep the torque is measured step motor is one of the most important parameters.Although holding torque is proportional to the electromagnetic excitation ampere turn,with the air gap between the rotor teeth.

But too much by reducing the air gap,increasing the excitation ampere turns to improve static moment is not desirable,it will cause heating of the motor and the mechanical noise.Keep the torque type determined as follows: Stepper motor dynamic torque a while it is difficult to determine,tend to make sure the static torque of motor.Static moment of choice was based on motor work load,the load can be divided into two kinds of inertia load and friction load.Single inertial load,and there is no single friction load.Order more (generally by low speed) when (suddenly) starting when the two kinds of load are to consider,when accelerating (slopes) starting main consideration of inertia load,constant speed run into as long as considering the friction load.In general,keep the friction load torque should be within diesel generating set 2 to 3 times as well,holding torque once selected,motor frame and length can be set down.

Low speed when the motor load

Reason and solutions:1.Power supply voltage is electric motor cooling fan too low,check the power supply voltage 2.The load is too large,check the load 3.Cage rotor winding -- change the rotor broken bar 4.Wound rotor winding a bad contact or disconnect-check brush pressure,brush contact with the slip ring and the rotor winding,Motor shell charged Reason and solutions:1.Bad earth or grounding acmotor2.blogspot.com resistance is too big,good earthed by the regulation,eliminate bad earth fault 2.Winding be affected with damp rotor balancing machine be affected with damp,dry processing 3.Insulation damage,touch shell-leaching lead paint to repair the insulation,again lead.

Capacitance recognition

 The capacity of the capacitor unit is: method (F),micro method (uf),leather (pf).Usually we don't use the unit,because it is too big.The conversion relationship between thepower electric motors various units as follows: 1 f = 1000000 uf uf = 1000000 pf in use,also often see units: nf.Uf = 1000 nf 1 nf = 1000 pf Several methods of capacitor has a capacity of identity: a,direct identification: above electrolytic capacitor,47 uf capacity,capacitance pressure 25 v.Second,the unit using the nf: polyester capacitor as shown above,nominal 4 n7,namely 4.7 nf,converted into pf is 4700 pf.There are,formagnetic generator example: 10 n,0.01 uf namely; 33 n,namely 0.033 uf.Behind the 63 refers to the capacitor voltage 63 v.Three,mathematical notation: above ceramic dielectric capacitors,values,104 capacity: 10 x10000pf = 0.1 uf.If the values 473,is the 47 x1000pf = 0.047 uf.(at the back of the 4,3,say how many power of 10).Such as: 332 = 33 x100pf = 3300 pf. The use of capacitance,should be in thewww.facebook.com/guohong.trading specified work under pressure.Now many of the quality of products,because use the pressure caused by insufficient capacitance fault common capacitance (burst).

New type of automobile permanent magnet generator and its application prospect

New type of automobile permanent magnet generator and its application prospect The new permanent magnet generator,automotive development and application At present,the main motor generator is silicon rectifying generator.The main defects such as: magnetic field generated by the electric field winding,rotor field winding burned,break easily,electric consumption,and must be provided by the battery field current to power generation,this is bound to increase the car cost.Silicon rectifying generator with a carbon brush slip ring structure,the slip ring diameter is large,high linear velocity,carbon brush is easy to wear and short service life,high failure rate.The other is a brushless generator,it increases the air gap magnetic field,the magnetic flux leakage,low material utilization,cost is high.Domestic automobile generator is mainly ferrite permanent magnet alternator,power under 200 w,not directly to automotive wiper,heater,electric horn,such as dc power supply,also can't give battery charging.At home and abroad in recent years,with a new generation of rare earth NdFeB permanent magnet materials,transforming traditional claw auto alternator,with high precision control and regulating circuit,the advanced technology of permanent magnet motor generator system.Such as JFYW series vehicle permanent magnet alternator,USES the ndfeb permanent magnet,compared with the line around the excitation generator,not made of black metal casting (forging) claw pole and the yoke,without excitation coil,without brush and collector ring.

Has the features of simple structure,reliable operation,long service life,small volume,light weight,less loss,high efficiency,low cost,and improve the vehicle electrical properties etc,and does not produce interference of on-board electrical appliances,reduce the battery charge and discharge frequency,director of the service life of the battery,the battery completely without electricity or out of the special circumstances of the battery,starter drive car.Since this series generator with low forward unique design,therefore,by the majority of urban transit system and low speed slow for a long time,frequent starting stop users widely recognized and applied. Second,the structure of the permanent magnet generator Automobile permanent magnet generator including casing,rotor,stator and other components.Fixed on the outside of the rotor steel shaft with weak magnetic circle,weak permeability round set has a groove,groove on with permeability and strong permanent magnet blocks,permeability and strong permanent magnet blocks of ratio of 2:1,the number of two pieces of permeability blocks and the clamp in the middle of the a strong permanent magnet blocks,a pair of poles with weak magnetic material between two pairs of magnetic poles apart,each pole of the adjacent opposite polarity.

The generator is suitable for automobile,engineering machinery,such as motor vehicles and stationary power plant as the charging power supply of the power supply.It consists of the excitation of the three-phase permanent magnet synchronous generators,after rectification,the output and parallel to the car battery power supply,electrical equipment at the same time can also to the battery.The generator in the development of not only successfully solves the permanent magnet generator under variable speed and variable load conditions of voltage stability problem,and solved the permanent magnet generator short circuit,fault protection,has high precision,high efficiency,low pressure charging performance is good,the advantages of larger than power,has a broad application prospect.Promote the use of automobile permanent magnet generator,can save a lot of energy,prolong the service life of battery,improve the economic efficiency of operations,but also conducive to the development and utilization of the rare earth resources of our country. Three,the permanent magnet generator technical advantages of the system Magneto's advantage is that it can be in 0 ~ 15000 RPM and high temperature environment to work properly,its motor parts advantages are: (1) no battery power.Because of its rotor is a permanent magnet,without excitation current,as long as the engine driven rotation can generate electricity,save energy,compared with the same volume of excitation generator,can get double the same circumstances,the output power,and when the damage to the vehicle battery power supply system in travel can still work normally,even without the battery,as long as the rocking forward motivation or slide ignition operation can be realized. 

(2) the power supply at low speed performance is good,small voltage regulation.When the power is low,the electromagnetic parameters of the same case,silicon rectifying generator zero current,permanent magnet generator can be exported 3 a ~ 5 a "field current",greatly improve the power water pump performance at low speed.As small leakage,direct axis and quadrature axis armature reaction reactance is small,the armature reaction is weak,so the voltage regulation is small,its external characteristic is relatively flat,high power,output voltage stability is also very good. (3) simple structure,reliable operation,stable performance.Only on the rotor structure of permanent magnet generator shaft,claw pole,wafer type ndfeb,simplify the processing procedure.A 25% reduction in weight compared with the same power generator,prolong the service life of the bearing,and effectively reduce the brush and slip ring friction of radio interference.Permanent magnet generator avoids electrical excitation generator excitation winding is easy to burn,bolt and the problem of carbon brush and slip ring is easy to wear.Electronic regulator and generator etc,make the generator overall realize dc output,small volume,light weight,easy to maintain.The attention of the auto industry.

Three-phase asynchronous motor test control what's the point?

(1) before installation should check electric between winding and winding insulation resistance to the ground conform to the specified value;(2) test the nameplate voltage,frequency,Ann method is electrical motor 12v 1000w consistent with the circuit,connection is correct;(3) check the motor internal presence of clutter, www.dongfeng-motor.com (4) to see whether there were any oil;(5) check whether the shaft of the motor can rotate freely;(6) test motor grounding is reliable;(7) if full tiejin slip ring,brush surface winder ac motor wind generator is flexible,the pressure is normal,etc.;(8) to test running direction is same as the motor cannot point direction arrow;(9) after operation low speed permanent magnet generator of motor no-load running 2 h,note interest bearing temperature,noise,vibration,the phenomenon such as local heating.

The effect of current transformer and voltage transformer

1,will be a lot of primary current is transformed into the standard 5 amp;2,for measuring device and relay protection provided acmotor2.blogspot.com by the coil current;3,the primary equipment and secondary equipment in isolation.The voltage transformer is a kind of voltage changer.It will be for low voltage,high voltage transformation in order to use low pressure value reflect changes in the high voltage value.Therefore,by voltage transformer can directly using ordinary electric instrument for voltage measurements.1,also known as the instrument transformer,voltage transformer is a kind of voltage brake rotor changer;2,the voltage transformer capacity is very small,usually only a few tens of to hundreds of volt-ampere;3,a voltage to the power grid voltage,voltage transformer is not affected by the secondary load,and in most cases the load is constant;


4,mainly single phase asynchronous motor secondary side load meter,relay coil,the impedance is very big,rarely by the current.If an indefinite increase secondary load,secondary voltage decreases,causing measurement error;5,to indirectly measure the voltage with voltage transformer,can accurately reflect the value of high side,ensure measurement accuracy;6,no matter how high voltage transformer primary voltage,electric motors price the second level of rated voltage is 100 v commonly,makes measuring instrument and the relay coil voltage to standardize on manufacturing.And ensure the safety of instrument measurement and relay protection work,also solve the insulation of the high pressure measurement,difficulties such as manufacturing process;7,voltage transformer used in distribution instrument measuring and relay protection circuit,etc.

Early study of permanent magnet synchronous motor

 Early study of permanent magnet synchronous motor mainly in fixed frequency power supply of the working characteristic of the permanent magnet synchronous motor research,especially the research of steady-state characteristics and direct starting performance.Permanent magnet synchronous motor starting directly depend on damping windings provides asynchronous torque motor speed up to close to synchronous speed,and the magnetic resistance torque and torque will be synchronous motor pull in sync.V.B.H onsinger and M.A.R ahman et al.A lot of research work has been done in this single phase capacitor start induction motor respect.In the eighty s,foreign to inverter power supply of permanent magnet synchronous motor for further research.Inverter power supply of permanent magnet synchronous motor with direct starting of the structure of the permanent magnet synchronous motor are basically the same,but in most cases without damping windings.Damping winding has the following characteristics: first,damping winding to generate heat,make the permanent magnet temperature rise; Second,increase the moment of inertia,damping winding motor moment of inertia ratio decline; Third,the tooth of the damping winding make pulsating torque increases.In inverter power supply situation,it will affect the original characteristics of permanent magnet synchronous motor,the steady state and transient characteristic of permanent magnet synchronous motor with a constant frequency compared with different features.

A large number of papers published after 1980 study the mathematical model of permanent magnet synchronous motor,the steady state characteristics,dynamic characteristics.A.V.G umaste research such as the voltage type inverter power supply of permanent magnet synchronous motor steady state characteristics and the current type inverter power supply of permanent magnet synchronous motor steady-state characteristics.With the constant improvement of the permanent magnet synchronous motor speed control system performance requirements,the perkins diesel generator need to design high efficiency,high moment of inertia ratio,high energy density of permanent magnet synchronous motor,G.R.S lemon and others diesel generator for speed control system dynamic performance and high efficiency requirements quickly,modern design method of permanent magnet synchronous motor is presented.With the development of microcomputer technology,permanent magnet synchronous motor vector control system of full digital control also has made great development.D.N aunin a permanent magnet synchronous motor is developed,such as right amount control system,using a 16 bit single chip microcomputer 8097 as control computer,realizes the high accuracy,high dynamic response of full digital control.

In the late eighty s,early ninety s B.K.B ose and published a large number of permanent magnet synchronous motor vector control system of full digital control of the paper.Speed controller of permanent magnet synchronous motor vector control system usually adopts proportional integral (PI) control.PI controller has a simple structure,good performance and is not sensitive to controlled object parameters change,etc.In 1991,R.B.S epe adopts self-tuning control in the speed controller for the first time.Early adaptive control is mainly used in dc motor adjustable beam system.National Taiwan university tian-hua liu and so on for the first time the robust control theory is applied to permanent magnet synchronous motor servo drive.Motor in the process of running,the model and the parameter is constantly changing,the change of the parameters and model will cause to reduce the performance of control system.All kinds of robust control technology in modern control theory to make the control system in the model and parameter changes to protect the good control performance.Will,therefore,all kinds of robust control technology used in motor speed regulation,can greatly improve the performance of speed control system.In this regard,the use of more successful control technology mainly include: adaptive control,variable structure control,parameter identification technology,etc.

What's short for current transformer of the TA?

 Voltage mini electric motor transformer - Potential transformer,abbreviated as PT.The Current transformer,Current transformer,abbreviated as CT.CT is a noun,refers to the current transformer.PT is a noun,refers to the voltage transformer.TA is a code,the generation refers to the current transformer,TV is a code,generator stator the generation of voltage transformer,TA,TV for secondary figure generation refers to the current,voltage transformer,is corresponding with the old standard LH,YH. Voltage or current transformer in proportion to transform electric motors 12 volt of equipment.

Divided into two major categories of voltage transformer and current transformer.Transformer features are: high voltage or high current in proportion to transform into standard low voltage (100 V / 100 V) or small current standard (5 a or 1 a,referring to the rated secondary rated current),in order to realize the measuring instrument,the standardization of protection equipment and automatic control equipment,miniaturization.In addition,the transformer can www.facebook.com/dongfeng.motor also be used to isolate the high voltage system,to ensure the safety of person and equipment.According to the needs of power system,the transformer is divided into independent type and equipment form a complete set with two kinds of casing

Bipolar stepper motor

 Bipolar stepper motor are so named mini electric motor because each winding can both directions electricity.So each winding can be N pole and can be the S pole.Stepping motor,it is also known as single winding because each only a single winding,it also referred to as two phase stepper motor,because has two separate coils.Bipolar stepper motor has four generator stator root lead,two each winding.With the same size and weight compared to the single step electrode polarity,bipolar stepper motor has a greater ability to drive,the reason is that the magnetic poles (not ask tap in a single coil) in electric motors 12 volt the field strength is twice the unipolar stepper motor.Bipolar stepper motor of each winding need a reversible power,usually provided by H bridge driving circuit.Because of the bipolar stepper motor than single polarity of stepper motor output torque,so is always used in the design of the space is limited.It is also a floppy disk drive head step into the mechanical system of driver is always adopt the cause of the bipolar stepper wholesalemotor.blogspot.com motor.To use digital multimeter can be quite simple to find two windings.If one could measure the resistance between two lead,then between the two leads are belong to a winding,the other two lines of q is another winding.Bipolar stepper motor of the interval is usually 1.8.Step,that is,200 a week.

Ammeter pointer during no-load or load running back and forth

1),2) squirrel cage rotor broken bar,a phase winding rotor circuit (3),a phase of wound rotor type motor brush contact bad 4),wound rotor type motor Poor contact slip ring wholesalemotor.blogspot.com short circuit devices 9.The cause of motor vibration 1),2) unbalanced rotor,shaft bending head 3) 4),imbalance of pulley,pulley eccentric shaft hole 5),fixed the loose bolts 6) of the motor,fixed The acmotortrading.blogspot.com foundation of the motor not firm or uneven 10.The cause of the motor bearing perkins diesel generator set overheating 1),2) bearing damage,lubricating oil too much,too little,or oily bad with 3),bearing and perkins diesel generator set shaft too loose walk in circle or too close with 4),bearing and end cover too loose walk outside Or too close.5),sliding bearing ring rolling or slow rotation 6),on both sides of motor end cover or bearing cover is not flat 7),belt tight 8),coupling packed Not good.

The working principle of dc motor

 To make the armature is a direction of electromagnetic acmotortrading.blogspot.com torque,the key lies in: when the coil side under the different polarity of magnetic pole,how to through the direction of the current in electric motors price the coil in a timely manner to transform,namely the so-called "reverse". This must add a device called a commutator,5kw permanent magnet generator commutator brush it can ensure each pole coil side under the direction of current is mini electric motor always a,can make electric function continuous rotation,this is the working principle of dc motor.

Two single polar stepper motor

This kind of stepper motor is referred to as the single polarity because each winding current to flow along one direction only.It is also referred to as the two line stepper motor,because it only contains two coils.The reverse polarity,two coil winding on the same core,with the same intermediate tap.Single polar stepper motor also referred to as 4 phase stepper motor,because it has four excitation winding.Single polarity of stepper motor fuses have 5 or 6.If the leads of the stepper motor is 5 root,then one of them is connected to the public line f v +),the other four phase 4 root respectively connected electricalmotor1.blogspot.com to the motor.If the leads of the stepper motor is 6,so it is more sections of a unipolar stepper motor has two windings,each winding have asked tap in a lead.But how to distinguish the lead? Please continue to read the following content.Distinguish line 6 single polar stepper motor joint recycling old printer when most often encounter this type of unipolar stepper motor.

Line 6 single polar stepper motor usually permanent magnet generators for sale looks like two single sections of stacked together,each single section has three lines elicit f see figure 6).This is a very easy to distinguish the leads of the stepper motor.Distinguish between 6 line stepper motor fuses order work is quite simple.If it is the structure of many sections of stepper motor,then the order of the lead has actually been given,with the digital multimeter can identify each public line of winding.Just keep winding for two fuses corresponding ac electric motors consistent,it doesn't matter whether they order only affects the direction of rotation of motor.If not more 3 phase motor sections of six lines of stepper
motor,can press the following steps to determine winding lead: (1) using a digital multimeter find public side each pair of windings.(2) according to the above methods can find two winding,separating them and marked.Please send one winding of marked A and C (also can be l and 3),another tag for B and D (can also be A 2 and 4).In each pair of windings,which fuses what order is not important,as long as
the pair is enough.

The choice of single-phase capacitor electric mechanical and electrical capacity

The choice of single-phase capacitor small electric fan motor electric mechanical and electrical capacity Most of single-phase motor capacitor,such
acmotor2.blogspot.com as washing machines,electric fans,submersible pump,small
woodworking planer,etc.But due to capacitor spoiled or improper selection capacity,Motor running temperature,noise,power consumption increases,the speed is reduced,the phenomenon such as torque decreases,here the selection of electrical and mechanical capacity of the capacitor motor approach to electricity Work friends can do a introduction,for your reference. Calculation method 1:Single-phase
capacitor electric mechanical and electrical capacity depends on the size of the deputy winding current.

Because of different sizes,single phase motor power to consider when choosing capacitance rev Dynamic torque,speed,temperature,noise and loss should be within the normal range.So first of all should from the nameplate detect single-phase motor power,calculate the primary winding of the electricity Flow,and then according to the primary winding current (0.5 0.7) times to perkins diesel generator set calculate the current value of each winding current,according to the formula C = IC * 10 divided by 2 PI fVo.The formula of the I I = P = V is obtained. 2:the selection of capacitor Single-phase capacitor motor should first choose oil-immersed capacitor,pressure value should be above 400 v.Second optional www.facebook.com/guohong.trading ac electrolytic capacitor,its small size,low prices,but life Life is a bit short.

Air switch principle

When line short-circuit or serious overload current,short circuit current instantaneous tripping over setting current value,electromagnetic trip generate ac electric motor enough suction,incorporating armature suck hit the lever,toggle hook around a shaft seat up and lock release,lock wholesalemotor.blogspot.com in reaction under the action of the spring will be three pairs of single phase asynchronous motor main contactor breaking,cut off power supply.When line general overload,overcurrent,although cannot make electromagnetic trip action,but it can make the heat element produces a certain quantity of electric motors 12 volt heat,prompting bimetallic strip heated bending upwards,push the lever to toggle hook and lock release,breaking will be the main contact,cut off power supply.

Single polar stepper motor step way

Single polar stepper motor can use three step method: single and double taps,half way.Single shot every time step approach refers to only give a winding electricity,as a result,the rotor rotation,and movement to the ac electric motor permanent magnet rotor winding with opposite polarity alignment position.Double beat way to two winding electricalmotor1.blogspot.com electricity at the same time,thus lead to the rotor rotation,and arrive in two permanent magnet electric winding the middle point of balance.Double shot method has the advantage of get 41.4% more than single permanent magnet generators for sale racket can output torque,but the price is twice cost in energy,because it has two phase winding electricity at the same time.Finally,make the way to work,let two winding alternately in electricity power with a single winding way.Half way of the output torque is smaller than double film method,with the design 3 phase motor is different,between 15% - 30% of change,but it can get double way clap twice stepper resolution steps (twice a week).Given in table 1 and table 3 under the three step way winding process of electricity.To make a stepper motor reversal reverse can just put the electricity process.

What are between motor and mechanical transmission way?

(1),the back wheel direct drive;(2),belt drive;(3),gear transmission;(4),worm drive (5),chain;6,friction wheel electric motor 12v 500w transmission.What inspection tour

the running transformer should do?(1),voice is normal;(2),check whether there is any oil leakage,oil leakage on the ac electric motor transformer,the color of the oil and oil level is normal;(3),current and temperature of the transformer is more than permitted;(4),transformer bushing,clean,ac induction motor 110kw do you have any damage crack and discharge; (5),transformer grounding are www.dongfeng-motor.com in good condition.What methods of transformer dry processing?(1),induction heating method;(2),hot air drying;(3),oven drying method.

Electric learning dribs and drabs

The choice of cable specification:low pressure parts,we are usually calculated according to current loop,again on this foundation to set aside 35% of the allowance (that is,computing current divided by 0.65),according to the results single phase induction motor compared with the current carrying capacity of the cable select cable; High pressure parts,wholesalemotor.blogspot.com it is in the loop on the basis of the calculation of cable set aside 20% of allowance,which is divided by 0.8 Electrical single phase asynchronous motor five prevention:1 to prevent false points,or circuit breaker.2 to prevent loading and isolating switch.3 prevent charged hang (us) ground wire (switch).4 with a ground wire (switch) circuit breaker (isolating switch).5 prevent straying into charged interval.The low voltage side of transformer is electric motors price quick break according to escape (maximum short-circuit current) three-phase short-circuit current setting.

The similarities of stepping drive way

If readers are smart,or very careful when practice,maybe you will note that single polar stepper motor and bipolar stepper motor on the stepper drive mode is very similar.As described above the single polarity of stepper motor step way form,for example,by exchanging electricalmotor1.blogspot.com the positions of the column and column C B,all the "tong" replace with "+",then in the lead with status to "+" in another column of the same winding up ".",will see and bipolar stepper motor in the same format on the form,only motor to the electric motors 12 voltopposite.This shows that any logic control single polar stepper motor can also be

used to drive a bipolar stepper motor.Pay attention to is the logic,rather than drive circuit.Bipolar

magnetic generator stepper motor windings need H bridge circuit,and the single polarity stepper motor only need a simple transistor switch.Do in single polar stepper motor control and switch between single phase asynchronous motorbipolar stepper motor,the only change is the exchange of B and C need logic output.