ELECTRIC MOTOR, COMPRESSOR, AND METHOD FOR CONTROLLING ELECTRIC MOTOR OR COMPRESSOR

摘要

An electric motor, a compressor including the electric motor and a method for controlling the electric motor or the compressor are provided. The electric motor includes: a stator; single-phase or multiphase windings disposed on the stator; and a rotor, where the rotor includes a permanent magnet, and at least part of the permanent magnet is ferrite. By using a permanent magnet synchronous motor in a variable-speed compressor, costs of the variable-speed compressor are significantly reduced, and the performance thereof is basically the same as that of a variable-speed compressor using a rare-earth permanent magnet synchronous motor. By controlling the electric motor or the compressor, costs of the electric motor or the compressor are reduced, and moreover, and the ferrite in the electric motor can be protected from irreversible demagnetization at a low temperature, thereby improving the reliability of the compressor.

主权项

1. An electric motor, comprising:
a stator; single-phase or multiphase windings disposed on the stator; and a rotor, wherein the rotor comprises a permanent magnet, and at least part of the permanent magnet is ferrite; a heating element disposed on a surface of or close to the ferrite of the rotor and operable for heating the ferrite.