Modeling method of variable magnetic flux leakage permanent magnet synchronous motor based on multi-working-condition operation

Abstract

The invention discloses a modeling method of a variable magnetic flux leakage permanent magnet synchronous motor based on multi-working-condition operation, which comprises the following steps of: establishing a finite element model of the variable magnetic flux leakage permanent magnet synchronous motor and simulating to obtain change data between quadrature-axis current iq and direct-axis inductance Ld, quadrature-axis inductance Lq, air gap flux psi delta and magnetic flux leakage psi sigma; performing data fitting on the quadrature-axis current iq and change data among the direct-axis inductance Ld, the quadrature-axis inductance Lq, the air-gap flux psi delta and the leakage flux psi sigma to obtain a corresponding change formula; substituting the change formula into a mathematical model of a traditional motor considering iron loss change to obtain a flux linkage equation, a voltage equation and a torque equation. A model of the variable flux leakage permanent magnet synchronous motor is established, neglected influence factors of magnetic field changes on modeling in a traditional motor model are taken into consideration, the established motor model is established based on multi-working-condition operation of the motor for the electric automobile, and the actual operation effect of the motor under multi-factor driving can be reflected more truly.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a modeling method of a variable flux leakage motor with high sensitivity to electromagnetic parameters and variable electrical losses under multiple working conditions. The established motor is particularly suitable for use in electric vehicles under actual low-speed heavy load , frequent start and stop, high-speed cruise and other multi-working conditions. Background technique [0002] Accurate simulation calculation of steady state and dynamic performance plays a vital role in the design, analysis and control of permanent magnet synchronous motor drive system. For variable flux leakage motors, different operating conditions in the same driving cycle will cause different degrees of magnetic saturation in the flux leakage bypass, and its electromagnetic parameters are prone to change, especially the air gap flux is more severe than that of traditional motors. At the same time, ...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a variable flux leakage permanent magnet motor based on multi-working conditions for the existing permanent magnet synchronous motor model that does not consider the problem that the electromagnetic parameters are easy to change and the motor loss exists under the actual operation of the motor such as low-speed heavy load and high-speed cruise. The modeling method of the magnetic synchronous motor, which considers both the loss factor and the parameter change, improves the accuracy of the motor model under multi-working conditions

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