Unlike motor, industrial applications, used in electric car motor usually require frequent start-stop, fast dynamic response, constant torque running at low speed and overload capacity is strong, wide speed range, can run for four quadrant, while fully meet car running function should also meet the comfort when driving, the ability to adapt to the environment, etc.
1)High torque density and high power density, in order to meet the demanding of space electric cars, at the same time also can reduce the body quality.
2)Wide speed range and can meet the needs of low grade and high speed cruise.
3)In a wide range of working speed and torque has higher efficiency.
4)Wide constant power operation ability, can reduce the motor rated power, which can reduce the cost.
5)High reliability and stability of vehicle running environment, any circumstances shall ensure the safety of the highly, especially controllable failure mode.
6)Low noise, including electromagnetic noise and audio noise, meet the needs of the electromagnetic compatibility of motor vehicles and driving comfort.
7)Reasonable cost, and cost for the popularity of electric cars has always been a big obstacle.
the evaluation indicator system of a brushless motor drive system with external characteristic (Maximum output torque and rotational speed), constant power speed range and driving system efficiency map (. It wasn't a point efficiency separate motor efficiency of ontology or controller)And the drive system torque density and power density.
