How to visually distinguish between ac and dc motor?

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 
Look from the other end of the motor output shaft, a blade is ac motor, can see the commutator (or see 3 phase ac auto parts induction motor commutator and carbon brush dc motor. If told two motors as big power, small volume of ac motor. Generally it is. Don't look at brand dc and ac motor is to judge? Can only see the inside of the motor acmotor2.blogspot.com terminal block wiring board, from Induction motor below strips can tell, is the dc and ac motor.

Direct torque control

 Direct Torque Control (Direct Torque Control, DTC), the text of the abroad some also called Direct self - Control, DSC, literal translation for Direct self Control, the concept of Direct self Control for Torque as the center for www.dongfeng- motor.com integrated Control, not only to Control the Torque, also used for the amount of flux linkage Control and flux linkage Control. The difference between the direct torque control and vector control is that it is not by controlling current, flux amount of indirect spare parts torque control, but the torque directly accused of quantity control, as the essence of which is using space vector analysis method, with the stator magnetic field orientation, the motor electric stator flux and electromagnetic torque in direct control. In 1985 Germany's ruhr university DiPu brock (m. epenbrock) professor is presented based on the first hexagon and round flux trajectory of the Direct torque control theory, he is called Direct self - control - DSC. This method does not need complex coordinate transformation, but directly on the motor fan cover stator coordinate computing the size of the torque and flux of the mold, and by direct tracking of flux and torque PWM pulse width modulation and high dynamic performance of the system.

Electric equipment maintenance procedures

 Oil-immersed transformer maintenance procedures are in operation or shutdown transformer routine maintenance once a year,stop running transformer increase maintenance once before put into use. Maintenance steps:(1) off to maintain the low voltage side of transformer circuit breaker,pull the isolating switch,hang on the permanent magnet motor corresponding sign.(2) disconnect the transformer high side load switch,confirmed after the disconnected position on grounding knife,and complete the switch security insurance and hanging sign.(3) into the transformer oil chamber,the first application of high-pressure electroscope to confirm whether the station transformer in the ac induction motor power state,and then pulled high voltage isolation knife,check the shell,porcelain and lead any deformation phenomenon,there is any breakage should be replaced,the oil level is normal,if there are any oil leakage phenomenon,should replace the rubber gasket,check whether the silica gel is effective,if there are any discoloration or serious failure,should be replaced immediately.

(4) retightened lead terminal,pin,grounding screw; Screw into the line,if there are any loose,should remove the screw with a flat file file interface,touch no uneven feeling after use clean cloth to wipe the dust,wipe on vaseline,change new spring washer,tighten the screw.(5) check whether the lighting,cooling and dust removal equipment surrounding the transformer is in good condition,with a clean cloth wipe away the diesel generators prices dust on the transformer body and vases.(6) check the transformer high side load switch,to ensure the flexible operation,good contacts,transmission part of the lubrication process.(7) 2500 v of the shaking table was used to measure high and low voltage transformer coil insulation resistance (to) and alternate with,in order (at room temperature 30 ℃,1 okv transformer high voltage side is more than 20 m Ω,low voltage side is more than 13 m Ω.Before the test,can good grounding wires,determination to end,should be discharge.

(8) check whether there is any legacy tools on transformer room and www.facebook.com/dongfeng.motor transformer,and verified,and on the high side isolating switch,evacuate the scene.(9) pulled high voltage earthing knife,after check grounding in the off position correctly,closed high-voltage load switch,let the transformer,and remove the high pressure side id CARDS,pay attention to in the open or close the transformer high voltage load switch,the site must have at least two people.Record maintenance results in detail,after delivery document preservation.(10) of the dry type transformer maintenance procedures and maintenance of oil-immersed very much the same. Maintenance of transformer's note: to ensure the use environment of transformer,in the absence of corrosive environment,the environment temperature should be within the - 30 ℃ to + 40 ℃,wind speed is not more than 350 meters per second,in the transformer high voltage side such as high voltage load switch,the operator should be three-phase transformer side short sub,and makes operation records at any time.High voltage transformer operating personnel should wear insulated shoes,wear insulated gloves.To prevent the transformer in the power and the transformer job mother discharge of electricity.

electric starting motor common fault analysis and maintenance of failure

When electric power,the motor does not work,and the motor without any sound.To analyze its main reason is the permanent magnet motor starter motor matching with electric equipment,if the electric fan,fan,washing machine motor adopts capacitor start running,and refrigerators,freezers starting mechanism adopts resistance split-phase start running,so once starting ac induction motor capacitor in the circuit and phase splitting resistance damage destroyed,seizing work,lead to motor testing should be excluded when starting or resistance after failure,to check the motor fault.Another case is inside www.facebook.com/guohong.trading the motor winding short circuit,partial winding burned,cause the motor to stop working.


When there is a failure in the once suspected the motor itself,the most simple detection with multimeter resistance of the winding resistance measurement.Will first motor three root lead ABC use multimeter to distinguish the judgment,here in double barrel of washing machine motor,for example,when measuring the resistance value between AB in 95 ohms,resistance value between the BC in 130 ohms,AB resistance in 12 ohms,so it is easy to determine the C for linear,AC for running winding,BC for starting winding.Above all is normal of the motor winding resistance value,in the event diesel generators prices of a short circuit,the resistance value are less than the above normal,motor windings of various kinds of problems.Again like a refrigerator motor starting winding short-circuit,23 ohm resistance around,no running winding short circuit,resistance value between 10 ohms,starting and running the concatenated winding resistance in 35 normal ohm.

Single-phase capacitor motor operation,do not run capacitor can turn,? What it up yesterday?

Single-phase capacitor motor operation,do not run capacitor can turn,? What it up yesterday? Capacitor is used to split phase,the purpose is to make two spare set of the current produce nearly 90 ゜ phase wholesalemotor.blogspot.com difference,in order to produce a rotating magnetic field.Three-phase electricity,each current itself has a phase difference between two

phase,there is no split phase.Start capacitor as acmotortrading.blogspot.com a

start.Running capacitor to improve the power of the machine.If don't running capacitor can also turn? Or perkins diesel generator set a smaller power?Single-phase motor in operation,and

capacitance is not can be removed.He is vice winding magnetic field,remove the induction

motorrunning capacitor if during motor operation,a little bit more motor with load will

stop.