The advantages of asynchronous motor over traditional permanent magnet motor

The advantages of asynchronous motor over traditional permanent magnet motor

The asynchronous motor is a three-phase induction motor, not the rare earth permanent magnet motor used in traditional electric vehicles. What are the reasons for this? The difference between induction motors and permanent magnet motors. Permanent magnet motors are synchronous motors. Its rotor uses permanent magnets, and the stator generates electromagnetic torque to push the rotor's magnetic field to rotate around the axis. The stator and rotor's magnetic fields are synchronized. The induction motor is an asynchronous motor. It is an AC motor that generates electromagnetic torque to drive the rotor to rotate by interacting with the rotating magnetic field formed by the stator winding and the magnetic field of the induced current in the rotor winding.

　　 The biggest drawback of asynchronous motors in the past was that it was difficult to control the rotation speed of the rotor, but with the development of modern semiconductor control technology, this problem has been solved.

　　Asynchronous motor advantage 1: Can endure large operating temperature changes. On the contrary, a large change in temperature will damage the permanent magnet motor.

　　Asynchronous motor advantage 2: The output torque of the induction motor can be adjusted in a wide range, so there is no need to install a second or even third set of transmission mechanisms. The motor speed designed by Tesla can reach 6000 revolutions per minute and can produce a torque of up to 400 Newton meters. It can forcefully increase the output torque when accelerating or climbing (although the time is short), while the permanent magnet motor electric vehicle needs Through the gear box to output more torque to achieve speed.

　　 Three advantages of asynchronous motor: small size and light weight. On the one hand, due to the large temperature tolerance range, asynchronous motors do not need to be equipped with radiators, cooling fans, water pumps and related pipelines like other electric vehicles. On the other hand, there is no need to install extra transmission mechanisms. Therefore, the size and weight of the motor are greatly reduced. The asynchronous motor is similar in size to a watermelon and weighs only 52 kg.

　　 In summary, the motor power system of the asynchronous motor has the advantages of light weight, high efficiency and compact structure.