A motor and the differences between the electricity principle of brushless motor
brush motors and brushless motor is inside the motor industry is now very popular motor, can be seen in all walks of life. There are a lot of customers are in with a brush motor starting to contact brushless motor, through the understanding of the performance characteristics of brushless motor, brushless motors can make their own equipment. So on the motor and the electric principle of the brushless motor what is the difference?
with motor and the differences between the electricity principle of brushless motor, a motor is mechanical commutation by carbon brush and commutator, brushless motor is based on hall element sensor signal by complete electronic commutation controller. A brush motor, unlike the electricity principle of brushless motor, its internal structure is different also. For the wheel hub motor, dongguan brushless dc motor, the motor torque output mode (Whether through gear deceleration deceleration)Is not the same, its mechanical structure is different also.
1. High speed motor internal mechanical structure. This wheel hub motor by the built-in high-speed brush motor, reduction gear group, overrunning clutch, wheel cover and other parts. The high-speed have brush gear hub motor belongs to the inner rotor motor.
2. Internal mechanical structure has a brush motor at low speed. The wheel hub motor consists of carbon brush, phase switcher, motor stator and rotor, motor shaft, the motor end cover, bearings and other parts. Low speed is brush not belong to the external rotor motor gear hub motor.
3. The internal mechanical structure of high-speed brushless motor. The heart by the built-in high-speed brushless motor wheel hub motor, planetary friction roller, the overload clutch, output flange, end cover, the wheel hub shells and other parts. High speed brushless gear hub motor belongs to the inner rotor motor.
4. Internal mechanical structure of brushless motor at low speed. The wheel hub motor by the motor rotor, stator, the motor shaft, the motor end cover, bearing and other parts. Low speed brushless gearless hub motor belongs to the external rotor motor. Key feature
brushless dc motor is widely used in electric vehicles, because it is compared with the traditional have a brush dc motor has the following two advantages.
（1)Long life, free maintenance, high reliability. In a brush dc motor, the motor speed is higher, yuntai brushless motor, brush and commutator wear faster, usually need to change the brush work 1000 hours or so. In addition the reduction gear box technology is difficult, especially the drive gear lubrication problem, is currently have brush in larger problem. So have a brush motor has big noise, low efficiency, easy to produce the problem such as fault. So the advantage of the brushless dc motor is very obvious.
（2)High efficiency and energy saving. In general, because of no mechanical commutation of brushless dc motor (BLDCM) friction loss and the consumption of gear box, and speed regulation circuit loss, efficiency is usually higher than 85%, but considering the actual design of the highest cost performance, in order to reduce material consumption, and the general design is 76%. And a brush dc motor efficiency due to the gear box and the consumption of overrunning clutch, usually at around 70%.
