Motor equivalent air gap model

Abstract

The invention discloses a motor equivalent air gap model. The equivalent air gap model is established on the basis of a unified air gap magnetic field modulation theory, and a typical induction motorand synchronous motor structure is divided into initial excitation magnetomotive unit, a modulator and a filter which are cascaded. An initial excitation source establishes initial magnetomotive distribution in the physical air gap; the modulator modulates the initial magnetomotive distribution to generate a series of magnetomotive harmonic components, and all the magnetomotive harmonic componentsgenerate corresponding magnetic flux density harmonic components in the air gap; and an armature winding, as the spatial harmonic filter, extracts the effective air-gap magnetic flux density harmoniccomponents to generate a magnetic link or an electromotive force and further to supply power to a load or receive synchronous current, so that corresponding mechanical output is generated. Mathematical expression of the equivalent air gap model is clear and concise, an air gap magnetic field modulation behavior can be described clearly, effectively and qualitatively, an operation characteristic of the motor is reflected, internal connection as well as difference between inductive motor and the synchronous motor is verified and sensed visually, and theoretical understanding is deepened.

Description

technical field [0001] The invention relates to the technical field of AC motors, in particular to an equivalent air gap model of a motor. Background technique [0002] Induction motors and synchronous motors are the most traditional AC motors. Due to their advantages of stability, reliability, mature development, easy processing and convenient control, they have always been research hotspots in the field of traditional motors, such as fault-tolerant control under fault conditions, and effective torque transmission. Scholars have done a lot of work in terms of the ability and overall efficiency of the motor, the establishment of a theoretical analysis model of the motor to analyze the loss characteristics, the analysis of the saturation characteristics, and the exploration of new topology structures. Because of their completely different topological structures and operating principles, induction motors and synchronous motors have always been divided into different chapters i...

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Problems solved by technology

Although these works use mathematical expression techniques such as matrix, transfer function, and block diagram, the mathematical expression is too complicated and the physical meaning is not obvious enough. In particular, the air gap energy conversion and transfer mechanism is not well expressed, so it cannot effectively reflect the operation of the motor. characteristic

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