Magnetic adjustment mechanism and magnetic adjustment method for permanent magnet motor

Abstract

The invention discloses a magnetic adjustment mechanism for a permanent magnet motor. The magnetic adjustment mechanism comprises a rotor, the rotor is surrounded by a ferromagnetic bridge, and the ferromagnetic bridge rotates with the rotor together. The ferromagnetic bridge comprises an N-pole ferromagnetic bridge and an S-pole ferromagnetic bridge. An axial single side or axial double sides ofthe rotor are correspondingly provided with axial magnetic adjustment devices, and axial air gaps are between the axial magnetic adjustment devices and sides of the ferromagnetic bridges. Each of theaxial magnetic adjustment devices is mainly formed by two magnetic adjustment groups in a concentric circle arrangement, and the two magnetic adjustment groups are corresponding to end sides of the N-pole ferromagnetic bridge and the S-pole ferromagnetic bridge. Each of the magnetic adjustment groups comprises two axial magnetization permanent magnets with opposite magnetization directions in a concentric circle arrangement, the two axial magnetization permanent magnets comprise an N pole axial magnetization permanent magnet and an S pole axial magnetization permanent magnet, and a magnetically conductive ring extends from one side of each of the axial magnetization permanent magnets away from a ferromagnetic bridge. Drawbacks of a traditional permanent magnet motor can be overcome, the adjustable air gap flux density of the permanent magnet motor is achieved, and the air gap flux density can realize the stepless magnetic adjustment within a variation range.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a permanent magnet motor magnetism adjustment mechanism and a magnetization adjustment method thereof. Background technique [0002] Due to its high efficiency, high power factor and high reliability, permanent magnet motors are widely used in social life and industrial production. However, the difficulty of adjusting the magnetic flux of permanent magnet motors limits further applications, such as wind power generation, electric vehicles and aerospace, which require a wide speed range. [0003] The invention patent with the notification number CN105914921A discloses an adjustable magnetic permanent magnet synchronous motor rotor with variable quadrature axis inductance, which belongs to the technical field of permanent magnet motor rotors. The invention aims to solve the problem that the efficiency of the system will be reduced due to the non-adjustable excitation of the permane...

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Problems solved by technology

The present invention aims to solve the problem that the system efficiency will decrease due to the non-adjustable excitation of the permanent magnet motor, when the permanent magnet motor operates at a speed above the rated speed and its speed is weakened

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