Bearing-free switch reluctance motor having axial-direction parallel hybrid structure and control method of motor

Abstract

The invention discloses bearing-free switch reluctance motor having an axial-direction parallel hybrid structure and a control method of said motor. A motor stator is composed of a reluctance motor stator and a magnetic bearing stator. A rotor is composed of a salient pole rotor and a cylinder rotor. The windings are composed of torque windings and suspension windings. The torque windings are composed of reluctance motor windings and wide-tooth windings and the number of the torque windings is identical to phase number m. The suspension windings are two and are arranged in the radial direction. The magnetic bearing stator is composed of four E-shaped structures and the width of each middle tooth is twice of the rest. According to the invention, suspension current is calculated according to a suspension force direction. Current of the torque windings and switching-on and switching-off angles of a power circuit are controlled separately and rotation speed and torque are controlled in real time. Current of the two suspension windings is controlled separately, suspension forces are regulated in real time and mutual decoupling is realized in rotation and suspension. According to the invention, the quantity of control variables is small; suspension control is simple; and a power converter of a suspension system is low in cost.

Description

technical field [0001] The invention relates to an axial parallel hybrid structure bearingless switched reluctance motor and a control method thereof, belonging to the technical field of magnetic levitation switched reluctance motors and their control. 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] The study found that whether the rotation and levitation functions of the bearingless switched reluctance motor can be decoupled, as well as the tracking and chop...

AI Technical Summary

Problems solved by technology

The alternate conduction control method is often used, and the number of phases of the suspension winding is the same as that of the torque winding, resulting in a complex suspension power circuit and high cost

In addition, since the torque winding current needs to be chopper-controlled during the levitation excitation phase to provide the required bias flux for the levitation winding, it is also unable to be fully excited, resulting in limited output torque

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