The use of current transformer should be paid attention to the following content

 electric motor stator rotor lamination motor parts 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 
5. stunning performance
1) current transformer secondary side absolutely not open during use. Used in ac electric motor the process of removing instrument or relay, should be prior to secondary side short circuit. When installation, wiring should be reliable, should not be secondary side installation fuse; 2) secondary side must be grounded at one end. Prevent damage of the primary and secondary side insulation, high voltage into the secondary side, endangers one's personal and equipment safety; 3) when wiring should pay attention to polarity. The polarity of the primary electric motor low rpm and secondary side of current transformer terminals, all show that the polarity with letters. 4) primary side concatenated in line, the secondary side of relay or measuring instrument series. PT, voltage motor electric transformer, English spelling Phase voltage Transformers, is the primary side of high voltage meter or relay in proportion into suitable rated voltage of 100 v conversion equipment. The working principle of electromagnetic voltage transformer and transformer are the same. Also known as a TV or YH (old symbols).

Frequency conversion air conditioning inverter touch panel circuit analysis

IPM to work normally, besides the input dc 300 v power supply, each power unit must also be provided by the switch power supply circuit dc + 15 v working voltage and the trigger voltage. The principle of switch power supply, as shown in figure 8, IPM and switch power supply in a circuit board. In the switch tube components for IC11, for power triode. Switching power supply control for discrete component polyester packaging IC8, internal control for double circuit. Terminal 5, 6, as an independent of the secondary power supply circuit, voltage of + 12 v, the control voltage output. generator set spare parts The rest of the terminal for www.dongfeng-motor.com primary power supply circuit, oscillation and regulating role. 

Terminals for power supply side, and 300 v dc, terminal 1 for oscillation positive feedback input, performance value is + 12 v, terminal 2 for switch pulse output, performance value of + 6 v. Close analysis of the 3 phase induction motor circuit to refer to figure 7 can find some special points in the following: 1. The + 12 v power supply (cold) constitute a loop, and common used for sampling and main circuit power supply voltage control. 2. Eu and U power supply constitute a separate circuit, trigger control signal U. 3. The Ev and AC synchronous generator V power supply constitute a separate circuit, control signal V trigger. 4. Ew and U power supply constitute a separate circuit, control signal trigger w. 5. Power supply and dc re E N composition circuit, control signal trigger of x, y, z, because x, y, z three signal common dc re N.

The classification and characteristics of ac regulated power supply

Able to provide a stable voltage and frequency of power supply according to ac regulated power supply.At present most domestic manufacturers is the work done by ac voltage stability.Below the market some ac regulated power supply,the classification characteristics. motor vehicle spare parts Parameter adjustment (resonance):this kind of regulated power supply,voltage stability is the basic principle of LC series resonance,the early type of magnetic saturation voltage stabilizer is belong to this category.It has the advantage of simple structure,without many of the components,reliability is quite high ac electric motor voltage range is wide,strong anti-jamming and resistance to overload ability.The disadvantage is that large energy consumption,noise big,bulky and high cost.On the basis of the principle of magnetic saturation of development into the formation parameters voltage stabilizer and China have been popular in the 50 s of "magnetic amplifier gather digital ac voltage stabilizer" (614) are the principle of ac voltage stabilizer.Autoformer (than) gather: 1,mechanical pressure regulating type,i.e.,according to the servo motor to drive the carbon brushes in autotransformer winding sliding surface move,change Vo on the ratio of the Vi,in order to realize the adjustment of the output voltage and stability.

The voltage stabilizer can from several hundred to several kilowatts.It is characterized by simple structure,low cost,the output waveform distortion small; But because the carbon brush sliding contact are prone to edm,brush damage that burned and failure; Slow speed and voltage regulation.Type 2,change the tap,autotransformer to make multiple fixed tap,through a relay or SCR (SSR) as switch machine 10,automatically change the tap position,so as to realize the stability of output voltage.This type of circuit voltage regulator the method is simple,wide voltage stabilizing range (130 v to 280 v),high efficiency (95%) or higher,the price is low.While the disadvantage is that low voltage stabilizing precision (plus or minus 8 ~ 10%) working life is short,it is suitable for the family to the air conditioner power supply.Power voltage compensation type electrical motor - purifying type (including precise voltage stabilizer) it USES compensation link to realize the output voltage stability,easy to implement microcomputer control.It has the advantage of good anti-jamming performance,high precision voltage (+ / - 1%) or less,fast response (40 ~ 60 ms),simple circuit,reliable operation.


The disadvantage is that: with the computer,program-controlled switches,such as nonlinear load are low frequency oscillation phenomenon; Input side current distortion degree is big,the source power factor is low; The output voltage to input voltage phase shift.Against interference function to demand higher units,it is advisable to apply in the city,computer power supply,must choose the computer about 2 to 3 times the total power voltage regulator to use.Because has stabilized,anti-jamming,the advantages of fast response speed,moderate price,so widely used.Switching regulated power supply: it is applied to the high frequency pulse width modulation technology,and it is the difference between general switch power supply output must be with the input side of the same frequency and phase ac voltage.It had quasi square wave output voltage wave type,type of ladder wave,sine wave,etc.,in the market for uninterruptible power supply (UPS) from the storage power supplies and chargers,ac voltage regulator is a switch mode power supply voltage regulator and control function is strong,easy to realize intelligent,is a very promising ac regulated power supply.But because of its circuit www.facebook.com/dongfeng.motor is complex,the price is higher,so to promote more slowly.

What is the meaning of power rating?The input power is what mean?

Would be rated power 100 w, 100 w?electric vehicle motor The input power of 350 w is must be 350 w?The input power, is the ac electric motor electric power consumed. Rated power generally refers to the effective power of the electrical appliances can be continuous output;Which is under normal working conditions electricalmotor1.blogspot.com the maximum power of can continue to work.

More than 110 kv transformer fault processing method

110 kv and above defective transformer.Treatment methods mainly include core inspection,repair,replace the seal leakage,oil change,vacuum drying,structure improvement,etc.For body slightly and can only deal with at the scene of be affected with damp be affected with damp,generally USES the vacuum hot oil circulation processing,after the hot oil into electrical motor the transformer,heat insulation,its internal moisture will evaporate,and filter oil machine from transformer top discharge,through continuous loop to achieve the purpose of drying. Using vacuum drying process be affected with www.facebook.com/guohong.trading damp be affected with damp,body,vacuum to remain above 750 MMHG column,after the body into the chamber,from low to high temperature to increase slowly.


When temperature 40 ℃ drying 48 h,48 h,to 60 ℃ drying to 75 ℃ in 48 h,finally to 95 ℃,the insulation resistance should detect every hour,when its value in 6 ~ 8 h remain unchanged or changed little,the vacuum drying.Practice has proved that the chamber upper and lower temperature regulation in 10 ℃,the best drying effect,should pay attention to is asynchronous motor in the process of drying to prevent seal heat aging,to them,and put an end and the secondary outlet end of the small porcelain set loose.On the oil storage tank sealing and sealing capsule quality is poorer,can be equipped with corrugated expansion method is used to change the sealing performance; To secondary board be affected with damp be generator generator set affected with damp in the tg of the delta slants big,can replace the original secondary wiring board,change the way to solve small secondary outlet casing.

The category of dc regulated power supply and choose

Dc stable power supply according to the habit can be divided into chemical power supply,linear

regulated power supply stability and switch mode power supply,they respectively have different types:Chemical power source,we used ordinary dry-cell batteries,lead-acid batteries,nickel cadmium,nickel metal hydride,lithium ion batteries are belong to this category,each have their advantages and disadvantages.With the single phase asynchronous motordevelopment of science and technology,and the intelligent battery;In rechargeable battery materials,American researchers found that manganese a iodide,use it can produce cheap,small,discharge time is long,many times after charging still maintain good performance and environmentally friendly rechargeable batteries.Linear stable power supply,linear regulated power supply is a common feature is that it is power device adjusting pipe work in the linear area,stable output by adjust the voltage drop between the tube.

Due to adjust the tube static loss is big,need to install a large radiator to electric motors 12

voltheat it.And because the transformer work in power frequency (50 hz),so the weight

is bigger.This kind of power source advantage is high stability,small ripple,high reliability,easy to make it more road,continuous adjustable output of finished products.The disadvantage is that large volume,heavy,efficiency is relatively low.Such a stable power supply and there are 5kw permanent magnet generator many,from the output properties can be divided into www.dongfeng-motor.com regulated power supply and current regulator and voltage regulator,steady into voltage steady flow (bistable) power supply.From the point of the output value can be divided into fixed point switch to adjust output power,band and several continuous adjustable potentiometer.From the output indicator can be divided into pointer on type and digital display type and so on.

Three-phase asynchronous motor fault analysis and processing method

Winding is part and parcel of the motors,aging,be affected with damp be affected with

damp,heat,erosion,foreign bodies,intrusion,the impact of the external force can cause damage to

winding,motor overload,under voltage,over voltage,lack of phase operation can also cause winding fault.Winding grounding,short circuit,open circuit fault generally fall into winding,connection errors.Now separately failure phenomena,causes and inspection method.A,winding grounding Refers to the winding and iron core or with insulation casing damage caused by the grounding.1,failure

phenomenon Chassis charged,heat control circuit is out of control,winding short circuit,the normal

operation of the motor.2,the reason Winding insulation resistance decreased,motor overload long-term operation of be affected with damp be affected with damp,harmful gas corrosion,metal foreign body into internal damage to the wholesalemotor.blogspot.com insulation,rewind stator windings insulation when damage to core,winding end touch end cover frame,stator rotor friction cause burns,lead insulation insulation damage and shell,and overvoltage (such as lightning) insulation breakdown.Methods to examine 

3.(1) the method of observation.Through visual winding overhang and line slot insulation observed with and without damage and charred traces,is the pick up location.(2) the multimeter test.The multimeter low-resistance archives check,reading is very small,it is grounded (3) megohmmeter.Selected according to different levels of different measuring each group resistance of insulation resistance by megger are,if the reading is zero,then the winding grounding,but the motor insulation be affected with damp be affected with damp or breakdown due to accident,must determine on the basis of experience,generally pointer swing timing in "0" place,its have certain resistance value can be thought of.(4) water pump motor try to light.If try lights,winding grounding,if found somewhere with a spark or smoke,is the place for winding grounding fault point.If lights dim the insulated grounding breakdown.If the light is not bright,but also showed a spark when the test stick ground,winding yet breakdown,just seriously be affected with damp be affected with damp.Also can use hardwood on the edge of the shell of the seam allowance tapping,to a certain place when a out a bright,when electrical current when broken,it is ground.

(5) current wear burning www.facebook.com/guohong.trading method.With a regulating transformer,after the power is connected,ground quickly small electric motors heating and insulation smoke is the pick up location.Should pay special attention to small motor shall not be more than twice the rated current,no more than half a minute,large motor as 20% - 20% of rated current or increasing current,burning to the ground just immediately without electricity.(6) packet elimination method.For the pick up location in iron core and burning more severe,in my heart burning loss of copper and iron core melt together.Approach is to put the grounding of one phase winding is divided into two and a half,and so on,finally find out the ground.In addition,there is high pressure test method,magnetic exploration method,power frequency vibration method,etc.4.The processing method (1) winding drying should be affected with damp be affected with damp cause ground,when cooled to about 60-70 ℃,pour insulating paint again after drying.(2) the end winding insulation damage,on the insulation processing is located in the back,painted and drying.(3) windings to place in the groove,should rewind or replace part windings components.Finally apply different measured by megger,meet the technical requirements.

Induction motor drive system

Asynchronous motor is characterized by simple structure,strong and durable,low cost,reliable operation,low torque ripple,low noise,do not need to position sensor,high speed limit.Induction motor vector control speed regulation technology is mature,the asynchronous motor drive system has obvious advantages,so the earlier was applied in electric vehicle drive system,the current is still the mainstream of the electric vehicle drive system products,but have been other new type of brushless permanent magnet traction motor driving system is gradually replaced.Biggest disadvantage is that driver circuit is complex,high cost; Relatively permanent magnet motor,induction motor efficiency and power density is low.2.The brushless permanent magnet synchronous motor drive system three phase induction motor Brushless permanent

magnet synchronous motor can use cylindrical radial magnetic field structure or disc axial magnetic

field structure,due to the power density and high efficiency and magnet prices wide speed

range,development prospect is very broad,is a strong competitor in the traction motor of electric

vehicle,had been used in a variety of electric vehicles at home and abroad.

Built-in permanent magnet synchronous motor,also known as hybrid permanent magnet reluctance motor.The motor on the www.dongfeng-motor.com basis of the permanent magnet torque superposition of the magnetic resistance torque,the existence of the magnetic resistance torque to improve motor overload capacity and power density,and easy to weak magnetic speed regulating,expanding the scope of the constant power operation.Built-in permanent magnet synchronous motor drive system design theory is increasingly perfect and further,with flexible structure,design degrees of freedom,is expected to get high performance,suitable for electric

cars,high efficiency,high density and wide speed traction drive.These cause the attention of the

peers in the major car companies,especially the Japanese car company colleague's favor.

At present,the American car companies peers in new model design mainly USES the built-in permanent magnet synchronous motor.generator stator Surface; also called permanent

magnet torque motor type permanent magnet synchronous motor,against the built-in permanent magnet synchronous motor,its weak magnetic speed range is small,low power density.The structure of the motor dynamic response is fast,and is expected to get low torque ripple,suitable for used in automobile electronic servo drive,such as automotive electronic power steering servo motor.Sensorless permanent magnet synchronous motor drive system is currently a hot topic in the research of permanent magnet synchronous motor drive system,will become the development trend of the permanent magnet synchronous motor drive system is one of the potential competitive advantage.Permanent magnet synchronous motor drive system often adopts vector control at low speed,high speed with weak magnetic control.

Structure and working principle of the generator is what?

Generators are usually made of stator and rotor,end cover and bearing www.facebook.com/guohong.trading components.By the stator core,stator line winding,stand and fixed the parts of other structures.Rotor by the rotor core (or a magnetic pole,the conjugate) 220v electric motor winding,retaining rings,central ring,slip ring,fan and shaft parts.The generator rotor rotate by the prime mover,when direct current (dc) after the rotor winding for carbon brush and slip ring access,rotor can produce magnetic fields.Due to the rotor is constantly perkins diesel generator rotating,so the diesel generator magnetic field is a rotating magnetic field,it and the relative motion is formed between the stillness of the stator winding,equivalent to the stator winding in constant cutting lines,and will in the stator winding induction electromotive force.The direction of the induced electromotive force of the stator,is decided by the right-hand rule.For Ren Yigen of coil wire,in the process of the rotation of the rotor,sometimes N pole toward it,S very on it,sometimes different polarity in the winding induction electric potential orientation is not the same.Back and forth direction change,this is an alternating current.

Before starting the phase asynchronous motor preparation and checking

1,check the brake motor and boot device grounding is reliable and complete,wiring is correct and in good condition.2,check the motor nameplate is shown in the voltage,frequency and power supply voltage and frequency.3,the newly installed or discontinued for a long time before starting the motor windings should check relative phase,the relatively insulation resistance.Insulation in the group should be greater than 0.5 ohms,if lower than this value,should be the winding drying.electric vehicle motor 4,should check the collector ring on the wound rotor on the brush device can work normally,brush pressure is in line with the requirements.5,check whether the motor rotation is flexible,whether within the sliding bearing oil reaches the oil level.6,check whether the rated current of fuse used motor meets the requirements.7,check the motor and installation bolt fastening bolt are on tight.After the above checks all meet the requirements,can start the motor.Motor starts,no-load running for 30 minutes,observe whether there are abnormal phenomena,such as noise,vibration,fever found abnormal situation,should take measures to stay is eliminated,can be put into operation.

When start the wound motor,should will start the rheostat connected to the rotor circuits.For motor with brush lifting mechanism,should put down the brush,and disconnect short circuit device,close the stator circuit switch,pull (rheostat.When the motor is close to the rated speed,brush,close the short circuit device,motor start over.The wholesalemotor.blogspot.com running maintenance 1,motor running after the regular maintenance,minor repair,overhaul two general points.Minor repair is a general maintenance,not big to the motor start device and a whole disassembly,about one in the first quarter,overhaul to all parts of all transmission device and motor is removed,and will remove the components of a comprehensive inspection and cleaning,usually once a year.2,use instrument monitoring power supply voltage,frequency and the load current of the motor.Power supply voltage,frequency,to comply with the motor nameplate data,motor load current shall not exceed the specified value,the plate of or to find out the reason,take measures to motor fan bad situation to eliminate the rear

can continue to run.3,take the necessary means to each part of the test motor temperature rise.4,for

wound rotor type motor,often should pay attention to the contact pressure between the collector ring

and brush,wear and spark.When motor stalling,should disconnect the switch inside the stator

circuit,then brush lifting mechanism to start position,disconnect short circuit device.5,motor should be always kept clean,there is no debris into the motor internal; Air inlet and outlet must be kept free of traffic.