A method and system for calculating the magnetic field of a multi-phase cage induction motor

A technology for induction motor and magnetic field calculation, which is applied in the manufacture of motor generators, electromechanical devices, electrical components, etc. It can solve the limitations of motor optimization design, and the subdomain model cannot further study the influence of space harmonic electromagnetic performance of magnetic potential, etc. problem, to achieve the effect of high optimization design efficiency, time saving and wide applicability

Active Publication Date: 2022-06-21
NAVAL UNIV OF ENG PLA
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Problems solved by technology

This method assumes that the air gap of the rotating cage induction motor only contains the fundamental magnetic potential, and the established subdomain model cannot further study the influence of the space harmonics of the magnetic potential on the electromagnetic performance of the motor, which has limitations in the optimal design of the motor

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[0072] like figure 1 As shown, as the first embodiment of the present invention, a method for calculating the magnetic field of a polyphase cage induction motor is provided, and the method includes:

[0073] Step 1: Divide the motor solution area according to the excitation source type, so as to obtain the motor model, and obtain the distribution function of the stator winding current density based on the motor model;

[0074] Step 2: Aiming at the influence of the k-th harmonic current density, the vector magnetic potential in each subdomain is used as the solution object of the governing equation, and the Laplace equation, Poisson equation and Helmholtz equation are established respectively, and according to each The general solution of the vector magnetic potential is obtained by the boundary conditions between the interfaces;

[0075] Step 3, based on the general solution of the vector magnetic potential of each sub-domain, solve the harmonic coefficient of each sub-domai...

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Abstract

A method and system for calculating the magnetic field of a multiphase cage induction motor. The method includes: dividing the solution area of ​​the motor according to the type of excitation source to obtain a motor model, and obtaining the distribution function of the current density of the stator winding based on the motor model; for the first Influenced by the kth harmonic of the current density, the vector magnetic potential in each subdomain is taken as the solution object of the governing equation, and the Laplace equation, Poisson equation and Helmholtz equation are respectively established, and according to the The general solution of the vector magnetic potential is obtained based on the boundary conditions; based on the general solution of the vector magnetic potential of each subfield, the harmonic coefficients of each subfield are solved; based on the harmonic coefficients of each subfield, according to the expression of the vector magnetic potential of the air gap subfield Obtain the radial and tangential components of the air-gap magnetic density, according to the radial and tangential components of the air-gap magnetic density, and according to the Maxwell tensor method, obtain the torque caused by the kth space harmonic of the magnetomotive force and the total electromagnetic torque moment.

Description

technical field [0001] The invention relates to the field of electric machine magnetic field calculation, in particular to a method and system for calculating the magnetic field of a multiphase cage induction machine based on a subdomain harmonic model. Background technique [0002] T. Lubin, etc. "Analytic calculation of eddy currents in the slots of electrical machines: Application to cage rotor induction motors," IEEE Trans. Magn., vol. 47, no. 11, pp. 4650–4659, Nov. 2011. This method uses the equivalent current layer at the edge of the stator to replace the stator winding as the excitation source, and calculates the eddy current distribution and electromagnetic performance in the rotor bars of the cage rotor induction motor based on the subfield method, but does not consider the stator slot with tooth tips. Unable to calculate the effect of stator slotting on the electromagnetic performance of the motor; [0003] Xue Zhiqiang, Zhou Yu, Li Huaishu. Analytical calculatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K15/00G06F30/20
CPCH02K15/00G06F30/20
Inventor 陈瀚斯赵镜红许浩熊义勇张俊洪周杨威郭国强吴媚张书恒
Owner NAVAL UNIV OF ENG PLA
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