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A method for magnetic field analysis and torque calculation of permanent magnet motor based on analytical method

A technology of permanent magnet motor and calculation method, applied in calculation, magnetic circuit, electromechanical device, etc., can solve the problems of calculation accuracy, iterative accuracy, long calculation time, etc.

Active Publication Date: 2018-09-28
CHINA THREE GORGES UNIV
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Problems solved by technology

The combination of analytical method and numerical method can accurately deal with various complex groove shapes, and the calculation speed is faster than the numerical method, but repeated iterations are required in the calculation process, so the calculation time is still long, and the calculation accuracy is affected by the iteration accuracy

Method used

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  • A method for magnetic field analysis and torque calculation of permanent magnet motor based on analytical method
  • A method for magnetic field analysis and torque calculation of permanent magnet motor based on analytical method
  • A method for magnetic field analysis and torque calculation of permanent magnet motor based on analytical method

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Embodiment Construction

[0053] Such as figure 1 As shown, a permanent magnet motor magnetic field analysis and torque calculation method based on the analytical method includes the following steps:

[0054] Step 1: Establish a mathematical model of the vector magnetic potential in the air gap area and the permanent magnet area;

[0055] Step 2: Establish a mathematical model of the vector magnetic potential in the groove area;

[0056] Step 3: Calculate the cogging torque;

[0057] Step 4: Analyze and compare the analytical calculation results.

[0058] Described step one includes the following content:

[0059] The permanent magnet is radially magnetized. In the two-dimensional polar coordinate system, only the z-axis component is effective. The expression of its magnetization intensity is r and θ functions by Fourier decomposition:

[0060]

[0061] in:

[0062] In the formula, p is the number of pole pairs, αp is the pole arc coefficient, and θ0 is the offset angle between the permanent ...

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Abstract

Provided is an analytical method based permanent magnet motor field analysis and torque calculation method. The method comprises the following steps of: step 1: establishing a magnetic vector potential mathematical model of a gap zone and a permanent magnet region; step 2: establishing a magnetic vector potential mathematical model of a slot area; step 3: calculating a cogging torque; and step 4: analyzing and comparing an analytical calculating result. The invention provides an analytical method based permanent magnet motor field analysis and torque calculation method. According to the structural features of a surface mounted radially magnetized permanent magnet motor model, the analytical model is divided into three sub-regions, namely a permanent magnet region, a gap zone and a slot area; a magnetic vector Laplace equation or a Poisson equation is established in each region; sub-region equations are connected through junction conditions, so as to obtain the analytical expression of a load air gap field and a slot field by using a direct analytical method.

Description

technical field [0001] The invention relates to a method for analyzing the magnetic field of a permanent magnet motor and calculating the torque based on an analytical method. Background technique [0002] Air gap magnetic field analysis of permanent magnet motor is the basis of motor design and performance calculation. The two-dimensional air-gap magnetic field of surface-mounted permanent magnet motor can be solved by numerical method or analytical method. The finite element method has strong adaptability and high calculation accuracy, but it takes a long time for modeling and calculation, which is not convenient in the optimal design of the motor. The physical concept of the analytical method is clear, and the analytical function can more intuitively reflect the relationship between each parameter and the magnetic field distribution. The parameter adjustment is convenient, the calculation amount is small, and the speed is fast, which is beneficial to the optimal design a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H02K1/00H02K29/00
Inventor 井立兵柳霖罗正豪代春燕
Owner CHINA THREE GORGES UNIV
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