Odd-pole three-phase linear permanent-magnet vernier motor

Abstract

The invention discloses an odd-pole three-phase linear permanent-magnet vernier motor, comprising an armature winding, a primary iron core yoke part, a primary iron core tooth part, permanent magnet poles and a secondary iron core, wherein the permanent magnet poles are uniformly distributed on the secondary iron core in the form of an array, and the polarities of adjacent permanent magnet poles are opposite; the armature winding, the primary iron core yoke part and the primary iron core tooth part form a motor primary stage; the permanent magnet poles and the secondary iron core form a motorsecondary stage; and an air gap exists between the linear motor primary stage and the linear motor secondary stage, and the linear motor primary stage and the linear motor secondary stage can move relative to each other. According to the invention, the constraint that the number of effective permanent magnet poles in a traditional linear permanent-magnet vernier motor is an even number is eliminated, and the concept of odd poles is provided, so the number of the effective permanent magnet poles of the linear permanent-magnet motor can be an odd number, a possible pole groove matching scheme isexpanded, and the design freedom degree of the linear motor is improved; and while the high thrust density characteristic of the linear permanent-magnet vernier motor is maintained, and the horizontal thrust fluctuation and the longitudinal magnetic tension fluctuation of the linear permanent-magnet vernier motor are reduced, so the control precision and the response speed of the motor are improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and more specifically relates to an odd pole three-phase vernier permanent magnet linear motor. Background technique [0002] Compared with the solution of rotating motor and ball screw to form linear motion, the solution of using linear motor to directly generate linear motion has a simpler structure, higher efficiency and better stability. Therefore, linear motors are becoming more and more popular in industrial fields that require linear motion. Linear motors are divided into two categories: linear induction motors and linear permanent magnet motors. Compared with linear induction motors, linear permanent magnet motors have better thrust density, power factor and efficiency performance. Among the many linear motor topologies, the vernier permanent magnet linear motor using the principle of permanent magnet and vernier motor has the characteristics of simple structure and high...

AI Technical Summary

Problems solved by technology

[0004] When the linear permanent magnet vernier motor is running, there will be a longitudinal magnetic pull between the permanent magnet pole and the primary of the linear motor; at the same time, due to the inherent edge effect of the traditional permanent magnet linear motor, the electromagnetic thrust and Longitudinal magnetic pull has large fluctuations

The fluctuating longitudinal magnetic pull will not only increase the deformation risk of the motor guide rail and system support components, but also introduce a variable resistance to the system, increase the difficulty of motor control, and reduce the control accuracy and response speed of the system

[0005] Generally speaking, since the traditional vernier permanent magnet linear motor is evolved from the rotary vernier permanent magnet motor, in the design process of the pole-slot fit, the constraint that the number of magnetic poles in the effective range of the motor is an even number is still followed. This constraint is actually Redundant, there is also the problem of the end being too long

At the same time, the longitudinal magnetic pull of the traditional vernier permanent magnet linear motor fluctuates greatly during operation

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