Long armature linear motor with active control shielding coil

Abstract

The invention discloses a long armature linear motor with an active control shielding coil. The motor comprises a linear motor long stator and a linear motor rotor; the linear motor long stator is formed by arranging stator armature modules. The stator armature module is composed of an armature coil and an active control shielding coil module. The armature coil and the active control shielding coil module are concentrically arranged, and the active control shielding coil module is linked with a magnetic field generated by the armature coil. The active control shielding coil comprises a shielding switch and a shielding coil body, and the shielding switch is connected with the shielding coil body in series. And when the shielding switch is switched on, the magnetic field link generated by the shielding coil and the armature coil is counteracted. The long armature linear motor can effectively reduce the leakage inductance of the stator section of the long armature linear motor. The motorcan also be used in other forms of linear motors, the power factor of the linear motor is improved, the capacity of a motor driving converter is reduced, and the cost of a motor driving system is reduced.

Description

technical field [0001] The invention relates to a long armature linear motor. Background technique [0002] The long armature linear motor has the advantages of simple structure, high efficiency, energy saving, low noise, fast response, good controllability, and stable thrust. As the traction power mechanism, the long armature linear motor driven by the converter has broad application prospects in the fields of high-speed electromagnetic ejection equipment and high-speed maglev trains. [0003] The long-armature linear motors driven by converters are mainly divided into long-armature linear synchronous motors and long-armature linear asynchronous motors. Long-armature linear synchronous motors are widely used in long-distance electromagnetic launch and maglev trains due to their advantages such as high thrust density, simple control, and good speed regulation performance. The literature "Research on a new type of permanent magnet linear synchronous motor for electromagneti...

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Problems solved by technology

[0004] Therefore, when the current is passed through the long stator of the linear motor, the magnetic field generated by the stator not covered by the magnetic poles of the linear motor mover cannot interact with the magnetic field of the linear motor mover, forming a leakage magnetic field

This part of the leakage magnetic field will form reactive power in the power supply system, resulting in a decrease in the power factor of the long-armature linear motor and an increase in the DC bus voltage of the inverter, resulting in a higher cost of the drive system

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