Bearingless switched reluctance motor, power converter and control method

Abstract

The invention discloses a bearingless switched reluctance motor, a power converter and a control method. One phase is used as a suspension phase, and its four windings adopt an improved low-cost half-bridge circuit. Suspension force and torque; the other two phases are used as torque phases, which only generate torque, respectively using an asymmetrical half-bridge circuit; in control, the suspension phase is divided into three types: positive torque, negative torque and zero torque. Each interval uses a different suspension control algorithm, and in the negative torque interval, use another torque to compensate for the negative torque generated by the suspension phase, thereby eliminating the current control algorithm for the suspension phase and torque phase The output torque fluctuations caused by the difference; due to the real-time adjustment of the instantaneous torque, the compensation accuracy is high, and the torque output quality is high; in addition, the power conversion circuit power tubes in the system are small, and the required digital control resources and drive detection circuits are few , the cost is significantly low, which is conducive to enhancing market competitiveness.

Description

technical field [0001] The invention relates to a bearingless switched reluctance motor, a power converter and a control method, and belongs to the technical field of power conversion and control of a bearingless switched reluctance motor. Background technique [0002] The bearingless switched reluctance motor is a new type of magnetic levitation motor developed in the 1990s. Since the bearingless switched reluctance motor integrates the functions of rotation and suspension, it can not only effectively solve the problems of loss and heat caused by bearing friction during high-speed operation, but also further exert the high-speed adaptability of the switched reluctance motor, thereby strengthening its Application base in high-speed fields such as aerospace, flywheel energy storage, and ships. [0003] According to the number of windings wound on the stator, the bearingless switched reluctance motor can be divided into two structural forms: single winding and double winding....

AI Technical Summary

Problems solved by technology

[0004] However, each winding of a bearingless switched reluctance motor with a single-winding structure requires a set of power converters and independent control, resulting in high power system costs, a large number of drive circuits and current inspection circuits, high digital control resource requirements and more complex control. Complicated, which delays the engineering practice application of this type of motor

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