A Method for Measuring the Leakage Inductance at the End of Concentric Winding of AC Motor Stator

Abstract

The invention belongs to the field of AC motor analysis and design, and relates to a method for measuring the end leakage inductance of concentric windings of an AC motor stator. The method comprisesthe steps: classifying the concentric windings into different types according to pitch; enabling different types of coils with the same symmetric axis to be connected in series to form coil groups ofthe same structure, and carrying out the solving through taking the coil groups as the basic units; determining the end leakage inductance between the concentric winding groups through combining witha method for obtaining magnetic flux through vector magnetic potential; obtaining the inter-phase end leakage inductance between any two phases of the stator winding through a correlation matrix. Themethod accords with the structural characteristics of the concentric windings in a better way, employs the correlation matrix, is simple, is high in universality, and can achieve the value obtaining process through a standard and unified program. The method is high in determining speed of parameters, is easy to modify, and facilitates the detection of concentric windings in different sizes. The method is remarkable in advantages at a motor design state when the stator winding is adjusted continuously, and provides a new way for the more accurate and quicker obtaining of the end leakage inductance of the concentric windings of the AC motor stator.

Description

Technical field: [0001] The invention belongs to the technical field of analysis and design of an AC motor, and relates to a method for measuring the leakage inductance at the end of a concentric winding of an AC motor stator, which is used for the optimal design of the electromagnetic structure of the motor with the concentric winding and the precise analysis of the operating performance. Background technique: [0002] The winding is the hub of the electromechanical energy conversion of the motor, and plays an irreplaceable role in the operation of the motor. Winding design is an important part of motor design. When designing windings, factors such as harmonic attenuation, heat dissipation, and insulation must be taken into account, and they are often designed in different forms. Compared with other forms of windings, concentric windings can not only weaken high-order harmonics, but also save wire materials. It is recognized as a low-harmonic winding. Due to its excellent p...

AI Technical Summary

Problems solved by technology

In the process of determining the parameters of the motor, the measurement of the end leakage reactance is a difficult point. At present, there are relatively complete analysis methods, but most of the studies are aimed at the lapped windings with relatively standardized connections at the ends of the windings, and for the more complex structures. There is no way to obtain the end leakage reactance of the concentric winding of the motor stator

Although the three-dimensional electromagnetic field method can be used to measure the end leakage reactance of concentric windings more accurately, the modeling is too complicated and the calculation time is long, which is difficult to meet the needs of actual engineering, especially motor design

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