Advantages and disadvantages of brushless motors

Advantages and disadvantages of brushless motors

advantage: 

a) Electronic commutation replaces traditional mechanical commutation, with reliable performance, no wear and tear, low failure rate, and a lifespan about 6 times longer than that of brushed motors, representing the development direction of electric vehicles;

b) It is a static motor with small no-load current;

c) high efficiency;

d) Small size.

 shortcoming: 

a) There is slight vibration when starting at low speed. If the speed increases and the commutation frequency increases, the vibration phenomenon will not be felt;

b) The price is high and the controller requirements are high;

c) Resonance is easy to form, because everything has a natural vibration frequency. If the vibration frequency of the brushless motor is the same or close to the vibration frequency of the frame or plastic parts, it is easy to form resonance, but the resonance can be adjusted by adjusting phenomenon is reduced to a minimum. Therefore, it is a normal phenomenon that an electric vehicle driven by a brushless motor sometimes emits a buzzing sound.

d) It is more laborious when pedalling, it is best to combine electric drive and pedal assist