Low-noise stable permanent magnet switch reluctance motor and manufacturing process and heat dissipation method thereof

Abstract

The invention relates to a low-noise stable permanent magnet switch reluctance motor and a manufacturing process and a heat dissipation method thereof. A permanent magnet circular ring is fixed to a rotor bracket of the motor, the permanent magnet circular ring is formed by an even number of stepped circular-arc-shaped permanent magnets in a head-tail oppositely matched mode, the magnetic polaritydirection of the circular-arc-shaped permanent magnets is radial, and the magnetic polarity of the adjacent circular-arc-shaped permanent magnets is different. When a double-magnetic-polarity cambered surface part section of the permanent magnet circular ring passes through a stator excitation salient pole pair, the change of magnetic acting force between the stator excitation salient pole pair and the rotor permanent magnet circular ring is obviously slowed down, and thus the motor operates more stably. Through the manufacturing process provided by the invention, a basic condition is createdfor improving the machining precision and the assembly efficiency of the motor. Various heat dissipation methods are ingeniously fused into overall design and manufacturing of the motor, convection heat dissipation of the motor structure, conduction heat dissipation of a metal material and heat-conducing heat dissipation of heat-conducting sealant are fully considered, and thus the optimal heat dissipation effect of the motor is achieved.

Description

technical field [0001] The invention relates to a permanent magnet switched reluctance motor and its manufacturing process and heat dissipation method, in particular to a permanent magnet switched reluctance motor with low noise and stable rotation speed, its manufacturing process and its heat dissipation and cooling method. Background technique [0002] Traditional permanent magnet switched reluctance motors are undergoing continuous improvement in mechanical structure and control methods. In recent years, a new type of "salient pole pair structure" motor with "excitation salient pole pair" and "permanent magnet salient pole pair" as the basic structural unit and a special excitation control method for motors with this structure have appeared in our country. . See Chinese patents CN2011104562663, CN2011104562841, CN2013105845226, CN2013105844505. This new type of motor changes and shortens the "shortest closed magnetic circuit" of the traditional permanent magnet switched...

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Problems solved by technology

However, the above-mentioned novel motor still has the following deficiencies: 1. When the number of "excitation salient pole pairs" on the stator and the number of "permanent magnet salient pole pairs" on the rotor are relatively small, that is, the ring-shaped permanent magnet When the distance between the salient pole pairs is large, the motor does not rotate smoothly, and there is a phenomenon of frustration; 2. When the excitation current in the excitation coil of the "excitation salient pole pair" suddenly changes direction, the rotor and stator are in the reverse flux linkage state of the magnetic circuit , the inductance in the winding is very small, which will generate a large inrush current, which will form a reverse magnetic field in the excitation coil, and this reverse magnetic field will have a demagnetization effect on the "permanent magnet salient pole pairs" on the rotor, thereby affecting Magnetic stability to permanent magnet salient pole pairs

There is an inter-turn gap between the windings of a traditional motor, and there is an air gap between the iron core and the winding. The heat conduction heat is conducted by air with high thermal resistance between the heating body winding and iron core, the heat sink casing and the stator seat. less efficient

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