Tangential-magnetized magnetic flux reversed mixed excitation linear motor

Abstract

The invention discloses a tangential-magnetized magnetic flux reversed mixed excitation linear motor, which comprises a primary rotor and a secondary stator; the primary rotor is formed by connecting primary modules in parallel; the primary rotor and the secondary stator are all made of a permeability magnetic material; the secondary stator is of a salient pole structure with equal tooth width; an air gap exists between the primary rotor and the secondary stator; two armature teeth are respectively arranged at two sides of each primary module; one excitation tooth is arranged between two armature teeth; one set of armature winding is wound on each armature tooth; one set of excitation winding is wound on each excitation tooth; two tangential-magnetized permanent magnets with opposite polarity are pasted at the end part of each armature tooth. The risk that the permanent magnets can not be reversely demagnetized is reduced, the reliability of a motor is improved, the problem of easy saturation of a narrow permeability magnetic bridge is solved, the fault tolerance performance of the motor is improved and the tangential-magnetized magnetic flux reversed mixed excitation linear motor is suitable for the application occasions needing large-range speed change operation.

Description

technical field [0001] The invention relates to a flux reversal motor, in particular to a tangentially magnetized flux reversal hybrid excitation linear motor. Background technique [0002] Where linear transmission is required, linear motors have higher transmission efficiency than rotary motors, which can improve the performance of the entire system. Especially in the wheel-rail transportation system, the linear motor has the advantages of strong climbing ability, strong line applicability, low engineering cost and low noise. Today, induction linear motors have been used in urban rail transit in various countries. However, induction motors have large excitation losses and low power factors. Compared with induction motors, permanent magnet linear motors have higher power index, higher efficiency, and higher power factor. However, for traditional permanent magnet linear motors, no matter whether the winding or permanent magnets are laid along the track, the manufacturing ...

AI Technical Summary

Problems solved by technology

However, the width of the magnetic bridge is narrow and easy to saturate, which restricts the magnetic adjustment ability of the motor

Segmented rotors also bring troubles to manufacturing, processing and installation

In addition, in the above motor structure, the magnetization direction of the permanent magnet is radial, and the magnetic potential generated by the current passing through the armature and the field winding is connected in series. The permanent magnet is prone to irreversible demagnetization, which will cause the motor to fail.

Images