How do motor companies grasp the development trend of the automotive market and strive for technical overtaking?
The motor technology is not as simple as we think. The domestic manufacturers of permanent magnet synchronous motors for vehicles are about 5 years behind the foreign countries. The difference lies in the design concept, raw materials and equipment, and the need to avoid foreign patents. ). In addition, there are gaps in the control of material loss, process and key parameters, and the product update speed is also slow. Future trends in motor products are higher output density, wider speed range, lower manufacturing costs, and easier integration (currently the most meaningful integration is the combination of motors, transmissions and controllers). Companies that can make breakthroughs in technology and customer response in the future are expected to win.
First, the motor magnetic field and working principle
Principle of electromagnetic force: Electromagnetic force means that the energized wire is subjected to electromagnetic force in the magnetic field. The electromagnetic force is opposite to the opposite sex and is repelled by the same sex. The opposite sex attraction here is definitely correct, but the same-sex refraction here means that the same polarity refers to the same polarity, but refers to the same electromagnetic magnetic properties. The current motor generating force mainly depends on suction.
Power generation principle: The conductor is induced in the magnetic field of the generated electricity, so that the circuit forms a loop to generate current.
The working principle of the permanent magnet synchronous motor: the rotating magnetic field is generated after the stator is connected to the alternating current, and the rotating magnetic field attracts the magnetic field of the rotor, which is the rotation of the rotor following the stator magnetic field.
It should be noted here that most of the motors used in the car are permanent magnet synchronous motors, and most of them are in-line synchronous motors. The main reason is that the in-line synchronous motors make good use of the reluctance torque. The effect of reluctance torque on the motor system is:
Under the same motor back EMF system, achieving the same torque can reduce the released current, which is beneficial to improve the efficiency of the motor under low speed and high torque, and also to create conditions for reducing the cost of the main components of the controller.
Under the same controller hardware condition, the high reluctance torque motor has higher idle speed than the low reluctance torque motor, which is beneficial to improve the working efficiency of high speed and small torque of the motor, improve electromagnetic noise and improve the speed of the motor system. range.
