Permanent magnet motor modeling and electromagnetic performance calculating method based on magnetic network

Abstract

The invention discloses a permanent magnet motor modeling and electromagnetic performance calculating method based on a magnetic network. The method comprises a modeling method for a stator, a rotor and an air gap of a motor. The method comprises: dividing a solution domain into different parts according to motion conditions; generating a magnetic resistance model in the subdivision unit; adding amagnetic potential model generated by permanent magnet materials and current loading, connecting branches in the parts in series and in parallel, the parts following the magnetic field continuity theorem at a motion interface, achieving continuous smooth distribution of magnetic flux in adjacent branches through a Lagrange interpolation method, and obtaining a node magnetic pressure equation of the whole motor; calculating a corresponding jacobian matrix by adopting a Newton iteration method to obtain a faster model convergence rate; verifying accuracy of a model. The method has the advantages that the universality of the modeling method is guaranteed through part division and unit division, magnetic circuit analysis does not need to be conducted on different structures, the modeling efficiency is the same as that of finite elements, certain solving precision is guaranteed, and the method can serve as a tool for preliminary and rapid analysis of motor performance.

Description

technical field [0001] The invention relates to a permanent magnet motor modeling and electromagnetic performance calculation method based on a magnetic network, belonging to the field of electromagnetic field calculation. Background technique [0002] The equivalent magnetic circuit method has become an indispensable tool in the field of electromagnetic analysis. It was initially used to analyze the saturation state of the motor. Due to its advantages in calculation speed, it is gradually applied to electromagnetic design. The equivalent magnetic circuit method takes into account the calculation speed of the traditional magnetic circuit method and the high flexibility of the finite element method. The magnetic circuit in the motor is characterized by a lumped parameter circuit model. For example, the reluctance is represented by resistance, and the geometric parameters and Material properties can flexibly adjust the resistance value; at the same time, it can also be used to...

AI Technical Summary

Problems solved by technology

However, in specific use, it needs to be designed and adjusted according to the type and structure of the motor to ensure speed and accuracy at the same time, which limits its application.

MotorCAD, ANSYSMaxwell and other mainstream motor finite element analysis software have built-in magnetic circuit models of commonly used motor types, and the calculation speed is significantly improved compared with the finite element method, but it cannot support new motor topology analysis and calculation

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