Second, the main performance parameters and interpretation of the vehicle drive motor
The main performance of the vehicle drive motor is mainly based on the following data:
1. The minimum working voltage of full power output: (rated voltage is not important) It should be noted here that the motor for the vehicle is all AC, but the data generally given by the manufacturer is that the DC data needs to be converted into an AC value, and the DC power is converted into an AC power. When passing the controller, this step requires a part of the voltage.
2. Maximum working phase current: The data given by the host factory cannot be used, and the IGBT capability of the controller should be combined.
3. Peak Torque: For commercial vehicle customers, it is possible to block the torque value.
4. Peak power: It should be clear what the peak power is at the speed.
5. Rated power/torque: The working point allowed for long-term operation is called rated power, but for the OEM, the reasonable rated power should be continuous torque and power. For example, the motor running power at high speed can be regarded as rated. Consider the rated power at the sewing speed.
6. Maximum working speed: The highest working speed includes the power at the highest working speed, the back potential at the highest speed, and the mechanical stress at the highest speed (is it stable at high speed).
7. NVH: low cogging torque and negative back EMF spectrum.
8. Efficiency: The data that needs attention here is the most commonly used efficiency of the motor, and it is also necessary to pay attention to the high efficiency area to properly match the customer's needs.
Third, the development trend
1. Higher output density - (the size of the fist is the best output 200kw)
Is there any material, low cost and high efficiency?
2. Wider speed range (0-18000 rpm, even 0-20000 rpm)
Is there a new principle that can bring costs down?
3. Lower manufacturing costs
New process (for example, is there any good insulating material that can increase the temperature resistance)
4. More easy to integrate
New applications (currently the most meaningful integration is the combination of motors, transmissions and controllers)
Fourth, IPMSM magnetic circuit structure
1. Common magnetic circuit structure
2. Development trend of magnetic circuit structure of permanent magnet synchronous motor for vehicle
The main trends are: high power density, low material loss, high speed rotation, and flexible control. The specific performance is:
Adapt to high reluctance torque performance and low magnetic steel consumption
Meet the integration needs of motors and gearboxes, pursue rotor size and thin design
Development of new magnetic steel process or high performance silicon steel sheet material
Catering to the special needs of the innovative control strategy for the motor magnetic circuit parameters
