Performance parameters of automotive permanent magnet synchronous motors

Automotive permanent magnet synchronous motors are about five years behind domestically compared to foreign countries. The main differences lie in design concepts, raw materials and equipment, as well as the need to avoid foreign patents (currently there are at least more than 4,000 patents from domestic manufacturers). The development trend of future automotive motors is higher output density, wider speed range, lower manufacturing cost, and easier integration. Therefore, we believe that future automotive permanent magnet synchronous motors are expected to win technically. So what are the performance parameters of automotive permanent magnet synchronous motors? Let’s find out together next!

The structure of the permanent magnet synchronous motor is somewhat complicated, but the principle of this motor is still easy to understand (the stator generates a rotating magnetic field after passing alternating current, and the rotating magnetic field attracts the rotor magnetic field, and the rotor rotates following the stator magnetic field).

The main performance parameters and interpretation of automotive drive permanent magnet synchronous motors are as follows:

To measure the main performance of automotive drive permanent magnet synchronous motors, we look at the following data:

1. Operating voltage of full power output: (Extra voltage is not important) What needs to be noted here is that automotive motors use alternating current, but the data generally given by manufacturers are direct current data that need to be converted into AC values. When converting direct current into alternating current, To pass through the controller, this process requires consuming part of the voltage.

2. Operating phase current: Do not use the data provided by the main engine manufacturer. It must be combined with the IGBT capability of the controller.

3. Peak torque: The only available stall torque value for commercial vehicle customers is the stalled torque value.

4. Peak power: It should be clear what the peak power is at what speed.

5. Extra power/torque: The operating point that is allowed to operate for a long time is called extra power. However, for the vehicle manufacturer, reasonable extra power should be continuous torque and power. For example, the operating power of the motor at high speed can be regarded as extra power and should be Consider the extra power at sewing speed.

6. Operating speed: The operating speed includes the power at the operating speed, the back electromotive force at the operating speed, and the mechanical stress at the operating speed (whether it can operate stably at high speed).

7. NVH: low cogging torque and negative back electromotive force spectrum wave.

8. Power: The data that needs attention here is the commonly used power of the motor. At the same time, it is also necessary to pay attention to the high-efficiency area to reasonably match the needs of the customer.