Measuring rotor winding connection is wrong use method of failure

Put the rotor under small electric fan motor test in a test in the mouth,use the turn-to-turn short circuit tester electricity,tester within the closed magnetic circuit core and rotor core has alternating magnetic flux.Multimeter is 10 v ac voltage profile,wholesalemotor.blogspot.com adjacent commutator segment and commutator segment,every piece of commutator segment,every two pieces of commutator segment,every three to every more pieces commutator segment between the voltage value.Rotor winding connection correct voltage size should electricalmotor1.blogspot.com be consistent,if you have below normal,it is possible that some components lead to reverse,with the fault of rotor winding to repair to meet again. "Little experience" Described above with a multimeter ac 10 v voltage profile measuring voltage between adjacent the commutator segment,as there are below normal,should turn the rotor position,and then look at the voltage value,so as high efficiency electric motor to avoid miscalculation.If still below normal,should be cleaned of mica slot commutator conductive material (such as charcoal powder),then test again,in order to avoid miscalculation.

Ac motor speed control method

Three-phase asynchronous motor speed control method,can have change very logarithmic p (speed regulating pole change motor),change frequency f1 (VVVF) and s (change slip acmotor2.blogspot.com speed) three.Change the power supply frequency f,slip ratio of the motor very logarithmic p and s can be too much to change speed.From the perspective of the nature of speed regulation,different ways of governing is nothing but change synchronous ac motor synchronous speed or not turn two.Widely used in the production of machinery is not the change in speed control method of synchronous speed of wound rotor motor rotor series resistance speed governing,chopping speed regulation,cascade speed regulation and application of the electromagnetic slip clutch,hydraulic coupling,such as oil film clutch speed regulation.


Changes of the synchronous speed logarithmic multi-speed motor,stator can change of the stator voltage,frequency,frequency control of electric motors 12 volt motor speed has no commutator motor speed regulation and so on.From energy point of view,when there is high speed control method and low speed control method of two kinds: an induction refers to the ac electric motor motor effective speed control is constant,so there is no slip loss,such as multi-speed motor,frequency control of motor speed and slip loss can be recovered speed control methods (such as cascade speed regulation,etc.).Have slip loss speed regulation method belongs to the low speed,such as rotor series resistance speed control method,the energy loss in the rotor circuit; Electromagnetic clutch speed regulation method of energy loss in the clutch coil; Hydraulic coupler speed regulation and energy loss in the oil of single phase asynchronous hydraulic coupling.In general slip loss increases with expanding range of speed regulation,if the speed range is not big,energy loss is small.

Stepper motor

Stepper motor no-load start frequency,often referred to as "empty frequency".This is to choose an indicator of step motor is more important.If required frequent start,stop,in a flash,and the speed at 1000 r/min or so (or higher),usually need to "accelerate the start".Directly if you need to start the

high-speed operation,had better choose asynchronous motor reactive or permanent magnet stepper motor.The step motor "empty frequency" are high.Keep the torque stepper motor,similar to the "power" referred to in the traditional motor.Of course,the distinction that having

essence.Physical structure of step motor,is completely different from ac,dc motor,the output power of the stepper motor is variable.Series three phase asynchronous motor no load start frequency,often referred to www.facebook.com/guohong.trading as "empty frequency".This is to choose an indicator stator of step motor is more important.If required frequent

start,stop,in a flash,and the speed at 1000 r/min or so (or higher),usually need to "accelerate the

start".Directly if you need to start the high-speed operation,had better choose reactive or permanent

magnet stepper motor.The step motor "empty frequency" are high.

Motor starting before the examination

New or stop using the motor for a long time, before the use should check between the winding and winding insulation resistance ac induction motor to ground. Usually below 500 v for the motor insulation resistance meter with 500 v; The 500-1000 with 1000 v v motor insulation resistance meter; Of more than 1000 v motor insulation resistance meter with 2500 v. Insulation resistance shall not be less than 1 m Ω work every kv voltage, and measured in the condition of motor cooling. (2) check whether there is any crack on motor appearance, all fastening screws and parts are complete, the thinking of www.dongfeng-motor.com fixed situation are in good condition. (3) check the motor drive induction motor sales mechanism work is reliable. As shown in (4) according to the nameplate data, such as voltage, power, frequency, coupling, rotating speed and power supply, if load is consistent. (5) monitor the ventilation of the motor and bearing lubrication situation is normal. (6) turn the motor shaft, check that the rotor can free rotation, the rotation has no noise. (7) to check the motor brush and brush lifting mechanism is flexible assembly, for the location of the brush handle is correct. (8) check reliable electrical grounding device.