A Method for Obtaining Leakage Inductance Parameters of Stator End of Asynchronous Motor

Abstract

The invention belongs to the technical field of analysis and design of asynchronous motors, and relates to an acquisition method for an asynchronous motor stator end leakage inductance parameter. A model is established according to the structure of a stator winding end, coordinates are determined, numerical calculation is conducted, a conical bell mouth tilt angle of the winding end is processed, and meanwhile, points are determined in one-dimensional space along the edges of coils in the vector magnetic potential calculation process; after air-gap current and image current are introduced, a three-dimensional rectangular coordinate system is established, and coordinates of corresponding points are determined; vector magnetic potentials of all the points are obtained in combination with a numerical method, numerical integration is performed along an integration path, magnetic flow and magnetic linkage are calculated to obtain end leakage inductance between the coils, and end leakage inductance between any two phases of the motor stator winding end with different bell mouth angles is obtained according to the connection relation between a phase winding and the end coils. The acquisition method for the asynchronous motor stator end leakage inductance parameter is simple, the principle is scientific and reliable, the calculation speed is high, errors are small, accuracy and practicability are high, and the application range is wide.

Description

Technical field: [0001] The invention belongs to the technical field of analysis and design of asynchronous motors, and relates to a method for obtaining leakage inductance parameters of a stator end of an asynchronous motor. Background technique: [0002] The stator winding parameters of the motor are the basis for the analysis of the equivalent circuit in the motor design. The accuracy of the calculation of the stator leakage inductance parameters of the asynchronous motor plays an important role in the analysis of the steady state operation and transient operation of the motor. The stator leakage inductance parameters include slot leakage There are three parts: inductance, harmonic leakage inductance and end leakage inductance, among which the acquisition method of end leakage inductance is the most complicated. The existing semi-empirical formula for stator end leakage inductance is only suitable for three-phase motors and the accuracy is difficult to guarantee; the thre...

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Problems solved by technology

[0002] The stator winding parameters of the motor are the basis for the analysis of the equivalent circuit in the motor design. The accuracy of the calculation of the stator leakage inductance parameters of the asynchronous motor plays an important role in the analysis of the steady state operation and transient operation of the motor. The stator leakage inductance parameters include slot leakage Inductance, harmonic leakage inductance and end leakage inductance, among which the acquisition method of end leakage inductance is the most complicated

The existing semi-empirical formula for stator end leakage inductance is only suitable for three-phase motors and the accuracy is difficult to guarantee; the three-dimensional electromagnetic field method has shortcomings such as complex modeling and long calculation time; the analysis method based on the Biot-Savart law takes into account both calculation accuracy and speed, but this method cannot take into account the inclination angle of the tapered bell mouth of the end winding; although the analytical formula can consider the inclination angle of the bell mouth, the formula is complicated and the processing is cumbersome, which affects the practicability

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