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.

Motor model parameters

Motor model is easy to use,design,manufacturing and other departments for business contact and simplified technology files in the product name,specification,type of narration and referenced by a symbol.Product code is made up of motor type codes,codes of characteristics and design of the serial number of three section sequence.Motor type code with:Y-said asynchronous motor;T-synchronous motor;Motor 220v electric motor characteristic code represent the performance of the motor,the structure or purpose and use of the Chinese phonetic alphabet. Such as explosion-proof type letters EXE (type) of increasing safety,EXB (flameproof),EXP (positive pressure type),etc.Design the serial number is high in center,core diameter,frame number,the flange 12v motor length,length of frame,core code,power,speed,or series of said.Such as:Y2-160 M1-8 diesel generator Y:models,asynchronous motor.

2:design the serial number,"2" for the first time based on the improved design of the product;160:high center,is the shaft center to the base plane height;M1:frame length specifications,M is medium,including footnotes "2" is the second M type core specification,type and "2" longer than "1" type iron core.8:pole,"8" refers to eight pole motor.Such as:Y 630-10/1180 Y said asynchronous motor;630 said power 630 kw;10,stator core diameter 1180 mm;The length of the frame adopt the internationally used symbol of letter;S is short frame type,M is the base type,type L is the length.Core length of letter with www.dongfeng-motor.com Numbers 1,2,3,in turn,said.

Three-phase asynchronous motor variable frequency speed regulation method

Frequency control of motor speed is to change the frequency of the motor stator power,to change its

synchronous speed control method.Variable frequency speed regulation system is the main equipment to provide frequency conversion power of inverter,the inverter can be divided into permanent magnet motors for saleac-dc-ac frequency converter and ac-www.dongfeng-motor.com ac frequency converter two kinds big,cross-straight-to pay inverter are mostly used in China at present.Its features:There is no additional loss of high efficiency and speed the process;Application range is wide,can be used in the cage type asynchronous motor;Large range of speed regulation,and the characteristics of ac motor wind generator hard and high precision;Technology is complex,high cost,difficult maintenance;This method is suitable for the requirement of high precision,220v ac electric motors better speed control performance.

A common faults and elimination method of induction motor

1) the motor can't start motor starting,ringing or low speed,this is the most common fault.Its reason is: power disconnection or blown fuse,switch starting equipment or a poor contact or broken line in the stator coil;Or because of lag in the brush brush card,no contact with the slip ring;Stator voltage is too low or excessive load on the permanent magnet generator reason leads to the failure.Processing methods available voltmeter to check voltage of the motor,such as a phase power lines to check the power supply of power,insurance,switch and starting equipment contact,repair or update processing respectively.If starting rheostat is damaged,can be used to check the lamp or shaking table test,find out the fault wholesalemotor.blogspot.com repair;If it is found that the load is too big,should reduce or change the capacity of the larger motor.(2) motor overheating causes overload or stator terminal voltage is too high,too low,poor ventilation,may also have a bolt stator coil,etc.Measures should be taken,such as reducing load,to adjust the mechanical and electrical pressure rating,remove the body ventilation slot dirties dustiness,bolt repair.(3) the spark to appear on the slide Reason is lack of the pressure on the slip ring or carbon brush and slip ring dirt,etc.,can be used sand paper to grind is good,with the cleaning brush frame,make the carbon brush block,adjust the spring pressure;Also can use clean cloth dipped in a small amount of gasoline,cleaning brush.If spark acmotortrading.blogspot.com for slip ring is not round,can take fine car slip ring polishing.(4) motor violent vibration Reason to install more bad,basic not firm,foot screw is not tight;The individual may also be due to rotor copper bar tensile fracture or short circuit ring.Find out that the former should be correct,which can replace the new copper,the fracture of the available copper weld repair.Sometimes because the rotational part touching the fixed place.Should check the shaft wear and clearance of the stator and rotor,take the fine car rotor or replacement of wearing parts.(5) motor no-load current balance,but value is big 1.The cause of the problem (1) to repair,the stator winding turns to reduce too much;(2) power supply voltage is too high;(3) Y after motor misconnection Δ;(4) in the motor assembly,rotor installed backwards,motor lamination making the stator core unaligned,effective length cut short;(5) the air gap is too large or uneven;6 overhaul when the demolition of the old winding,using hot tear open method is undeserved,make the iron core loss.2.The troubleshooting (1) rewind stator winding,restore the correct number of turns;(2) managed to restore rated voltage;(3) to connect to Y;(4) to assembly;(3) to replace the new rotor or adjust the air gap;(5) maintenance core or recalculate winding,appropriately increase the number of turns.

Electrical Induction Iron Motors Frame

Motor is a kind of rotary electric machine,it will be electrical energy into mechanical energy,which mainly includes a magnetic field to produce electromagnetic winding or the distribution of the stator winding and a spin three phase generator Turn the armature or rotor.Under the effect of rotating magnetic field of stator winding,its a current in the armature squirrel-cage aluminum box by and by the magnetic field effect and make the turn.Some of these machine types can be used as a motor,also can use as a generator.It is the electrical energy into mechanical energy of a machine.Usually the work of the wholesalemotor.blogspot.com motor rotating parts Movement,called the motor rotor motor; Also has a linear movement,known as linear motor.Electric function provides a large range of power,class from milliwatts to kw.Machine tools,water pumps,belt machine,fan motor drive; motor fan Electric locomotive,elevators,traction motor is required.Family life of the electric fans,refrigerators,washing machines,even each Kind of motor toys is inseparable from the motor.Motor has been used in all aspects of modern social life.