PMSM Motor Permanent - Magnet Synchronous Motor For Electric Vehicles

PMSM Motor Permanent-Magnet Synchronous Motor for Electric Vehicles

Introduction

In AC asynchronous motor, the formation of rotor magnetic field should be divided into two steps: the first step is that the stator rotating magnetic field first induces current in the rotor winding; The second step is to induce current to generate rotor magnetic field. Under the action of Lenz's law, the rotor rotates with the rotating magnetic field of the stator, but it "can never catch up", so it is called asynchronous motor. If the current in the rotor winding is not induced by the stator rotating magnetic field, but generated by itself, the rotor magnetic field is independent of the stator rotating magnetic field, and its magnetic pole direction is fixed, then according to the principle of same-sex repulsion and opposite-sex attraction, the stator rotating magnetic field will pull the rotor to rotate, and make the rotor magnetic field and the rotor rotate "synchronously" with the stator rotating magnetic field. This is the working principle of synchronous motor.
According to the different generation modes of rotor self generated magnetic field, synchronous motors can be divided into two types:
First, connect the rotor winding with external direct current (excitation current), and then generate the rotor magnetic field by the excitation current, so as to make the rotor rotate synchronously with the stator magnetic field. This kind of synchronous motor with rotor magnetic field generated by excitation current is called excitation synchronous motor.
Second, permanent magnets are simply embedded in the rotor to directly generate a magnetic field, eliminating the link of excitation current or induced current. This kind of synchronous motor with rotor magnetic field generated by permanent magnet is called permanent magnet synchronous motor.

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