Magnetic field calculation method for axial magnetic field hybrid excitation motor with asymmetric air gap structure

Abstract

The invention discloses a magnetic field calculation method for an axial magnetic field hybrid excitation motor with an asymmetric air gap structure, and the method comprises the steps: firstly determining a solving coordinate system, distinguishing solving regions, building a Laplace equation or a Poisson equation, and listing corresponding boundary conditions; converting an equation under a rectangular coordinate system into a cylindrical coordinate system, and establishing an analytical general solution equation; determining an analytic special solution equation of the motor in combinationwith boundary conditions; determining the lengths of air gaps in different regions of the motor, and decomposing the residual magnetization intensity of the permanent magnet array into superposition of an axial component and a circumferential component; solving axial components and circumferential components of different permanent magnets in the form of Fourier pole numbers in combination with boundary conditions; and finally, substituting a component needing to be solved into an analytic special solution equation of the motor. The method is suitable for magnetic field calculation of an axialmagnetic field motor with a common symmetric air gap structure, magnetic field calculation of an axial magnetic field motor with an asymmetric air gap structure and magnetic field calculation of various permanent magnet hybrid excitation motors.

Description

technical field [0001] The invention relates to a calculation method of the air gap magnetic field, in particular to a calculation method of the air gap magnetic field of an axial magnetic field motor adopting hybrid permanent magnet Halbach array excitation. Background technique [0002] There are many analytical methods for calculating the air-gap magnetic field. For example, the patent No. CN109948298A proposes a method for calculating the magnetic field of a permanent magnet motor with a non-uniform segmented Halbach array. The magnetic field of a permanent magnet motor is accurately calculated. Patent No. CN104091060A proposes a method for calculating the magnetic field of a segmented array permanent magnet motor, which can accurately solve the magnetic field of an inner and outer rotor segmented array permanent magnet motor with any number of magnetic blocks per pole and number of pole pairs. However, most of the methods are calculation methods for radial magnetic fie...

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Problems solved by technology

The finite element method consumes a long calculation time, and it is not easy to study the influence of the motor structural parameters on the motor magnetic field

The calculation accuracy of the equivalent magnetic circuit method depends on the number of meshes, but the more the number of meshes, the longer the calculation time. Therefore, the calculation accuracy of this method is inversely proportional to the calculation time, which has its own limitations. sex

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