Modeling method of axial split-phase hybrid excitation type magnetic suspension motor

Abstract

The invention discloses a modeling method of an axial split-phase hybrid excitation type magnetic suspension motor, which comprises the following steps of: firstly, calculating the length of an air gap between a stator and a rotor when the rotor of the motor generates eccentric displacement by using a plane coordinate method, and meanwhile, specifically equivalent a magnetic circuit of the motor by using an equivalent magnetic circuit method, and then, establishing a torque model and a suspension force model of the motor; when a motor torque model is established, an expression of electromagnetic torque and self-inductance of a torque winding are solved, and when a motor suspension force model is established, suspension magnetic flux at a suspension air gap is solved; furthermore, the expression of the suspension force is obtained, the air gap length corresponding to each air gap of the motor is calculated by using a plane coordinate method when the rotor generates eccentric displacement, the principle is more intuitive, and the result is more accurate; on the basis that the air gap length corresponding to each air gap is calculated by using a plane coordinate method, a mathematical model of the motor is established by using an equivalent magnetic circuit method and a basic circuit principle, so that the established model has good accuracy.

Description

technical field [0001] The invention relates to a magnetic levitation motor technology, in particular to a modeling method of an axial split-phase hybrid excitation type magnetic levitation motor. Background technique [0002] Considering that the traditional mechanical bearing has serious friction loss and heating problems, which restrict the working efficiency and high-speed running performance of the motor, the research on the magnetic levitation motor has arisen in recent years. By winding the suspension winding on the stator of the motor, the suspension force is generated, and through the active control of the suspension force, the stable suspension operation of the motor without bearing and friction is realized. For the control of the motor, an accurate mathematical model has an important position. [0003] For magnetic levitation motors without fixed bearings, the rotor position is not fixed at the center position. The eccentric displacement of the rotor will have a...

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Problems solved by technology

Although such an approximation can greatly reduce the difficulty of analysis, it will lead to the establishment of a model that is not accurate enough to match the actual situation

In subsequent studies, although the lateral offset α and the longitudinal offset β were considered at the same time, the effects of the two offsets were still mechanically considered separately, and then simply superimposed

In addition, the fact that the length of the air gap corresponding to each air gap is different when the rotor is eccentrically displaced is ignored

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