Electric vehicle is the development trend of the automobile industry. We all know that the core of its principle is to replace the engine with the automobile driving motor to realize the electric drive. But have you ever thought about whether the driving motor of electric vehicle is the same as that of ordinary motor? The answer is definitely No. compared with conventional induction motors, electric vehicle motors are quite different in performance requirements and driving principles

   1. Electric vehicle motor should have large starting torque, good starting performance and good acceleration performance to meet the requirements of frequent starting and stopping, acceleration and deceleration or climbing. In the motor test, the response time is required to be short when the motor is in the speed or torque control; at the same time, when the external load changes step by step, the response of the motor itself should be fast enough to adjust the output power and speed;

   2. The constant power range of electric vehicle motor should be designed wider to meet the torque output of electric vehicle at high speed;

   3. The electric vehicle motor should have a wide range of speed regulation ability, with large torque at low speed and high power at high speed. It can adjust the driving speed and corresponding driving force at any time according to the driving needs;

   4. The electric vehicle motor should have good efficiency characteristics. In a wide range of speed / torque, it can achieve good efficiency and improve the continuous driving mileage after charging. Generally, it is required to obtain 85% ~ 93% efficiency in typical driving cycle area;

   5. The size of electric vehicle motor should be as small as possible, the weight should be as light as possible, and the power density should be optimized;

   6. Electric vehicle motor should have good stability, temperature and humidity resistance, long-term work in harsh environment, low noise and easy maintenance;

   7. Whether the motor controller can effectively recover the energy generated by braking.