Modeling Method of Equivalent Air Gap of Stator Double Windings in Temperature Field Analysis of Switched Reluctance Motor

Abstract

The invention provides a method for modeling the equivalent air gap of the stator double windings in the temperature field analysis of the switched reluctance motor, which includes the following steps: according to the first winding air gap, the second winding air gap and the winding surface insulation layer, the three structures Determine the equivalent model of the stator double winding with the width; according to the equivalent model of the stator double winding, establish the three-dimensional finite element model of the switched reluctance motor; Field analysis to obtain the temperature field distribution map of the switched reluctance motor; according to the numerical fitting of the data in the temperature field distribution map, the functional relationship between the first winding air gap width and the temperature of the stator double-winding equivalent model is obtained; through the actual measurement of the motor The actual temperature of the area corresponding to the surface of the stator winding and its equivalent model is used to calculate the air gap width corresponding to the current model of the stator double winding of the switched reluctance motor. The method of the invention enhances the accuracy of the temperature field analysis results of the switched reluctance motor.

Description

technical field [0001] The invention relates to the field of temperature field analysis of switched reluctance motors, in particular to a modeling method for equivalent air gaps of stator double windings in the temperature field analysis of switched reluctance motors. Background technique [0002] Switched reluctance motors have been widely used in many fields because of their advantages such as simple structure, large starting torque, small starting current, wide speed range and high reliability. During the operation of the switched reluctance motor, a large amount of heat is generated due to loss inside the motor. On the one hand, the heat causes the internal temperature of the motor to rise rapidly. The temperature of each component inside the motor reaches a certain stable value; if the internal temperature of the motor is too high, the insulation of the motor will age rapidly, which will seriously affect its service life. Therefore, it is of great significance to carry...

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Problems solved by technology

However, when using the finite element method to analyze the temperature field of the switched reluctance motor, the accuracy of the model is high, especially the accuracy of the stator double winding model; however, if the actual structure of the switched reluctance motor is used to establish its The three-dimensional finite element model has many problems such as long modeling time, complex model structure, large amount of calculation, and high requirements for computer performance, so it is difficult to popularize and apply

Therefore, when actually modeling the switched reluctance motor, it is often necessary to simplify the model appropriately, especially for the winding air gap existing in the double winding of the stator. The irregular structure of the air gap between the stator slot wedges makes it extremely difficult to model, so it is often ignored in actual modeling; although this treatment simplifies the modeling process of the stator double winding, it significantly reduces the switching magnetic field. The accuracy of the resistance motor model affects the accuracy of the temperature field analysis results of the switched reluctance motor

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