Currently there are 5 kinds of electric vehicles

brush series brushless dc motor,permanent magnet dc motor,ac motor (induction motor),permanent magnet synchronous motor and BLDC motor FM.Brushless dc series motor are: the advantage is that big start torque,overload capacity is strong,the disadvantage is that need to change the carbon brush,high speed has the ring of fire,not suitable for high speed running,low efficiency,large volume,protection and energy feedback is poor,mainly used in electric tricycle.Brush with permanent magnet dc motor: advantage is better than brushless diesel generator dc series motor has high efficiency,energy feedback is good,starting torque and overload ability general,defect is need to change the carbon brush,high speed has the ring of fire,not suitable for high speed operation,efficiency,large volume,moderate protective ability is poor,mainly used in electric tricycle.

Ac motor,the advantage is simple structure,high reliability of motor itself,the disadvantage is that starting torque is small,large starting current,motor depends on increasing the starting current to produce a large torque,but due to the battery characteristics,the battery provides large current,affects the motor torque,the motor efficiency is low,the control of complex,energy feedback performance is poor.Switched reluctance motor: advantage is in low speed with large torque,defect is low speed vibration,noise,low efficiency,poor energy feedback,rarely used.Permanent magnet synchronous motor,the advantage is with high efficiency,energy feedback acmotortrading.blogspot.com is good,the disadvantage is that when the low speed torque cannot ascend,lose the step problem,rarely used.

Brushless dc motor: advantages are: (1) motor external characteristic is good,very accord with the load characteristics of electric vehicles especially motor has low speed high torque characteristics of the precious,can provide large starting torque,satisfy the requirement of the vehicle acceleration.(2) the wide speed range,the motor can run tall in the low speed range,due to mechanical commutator and brush motor,the motor can run under low.(3) motor with high efficiency,especially under the light load cars,motor can still keep high efficiency,it is very important for precious battery power.(4) overload capacity is strong,this kind of motor than Y series motor overload capacity can be improved more than 2 times,can meet the needs of the vehicle bumps blocked.(5) regenerative braking effect is single phase generator good,because of the permanent IE2/IE3 electric motor magnetic motor rotor has the very high,when the car downhill or brake motor generator can be completely into the state,to recharge the battery,the electric braking effect at the same time,reduce the financial burden on mechanical brake.

6.Motor small volume,light weight,high power,can effectively reduce weight,save a space.7 no mechanical commutator motor,USES the totally enclosed structure,prevent dust from entering the motor internal,high reliability.Simple than asynchronous motor was motor control system.Faults is more complicated than the ac motor motor itself,brushless dc motor controller than there are complex.