Sectional type Halbach array permanent magnet motor magnetic field calculation method

Abstract

The invention relates to a sectional type Halbach array permanent magnet motor magnetic field calculation method. The sectional type Halbach array permanent magnet motor magnetic field calculation method comprises the steps of determining solution areas, respectively building Laplace's equations or Poisson's equations for the different solution areas, calculating the interval between magnetic blocks of a sectional type Halbach array, solving the radial and tangential component amplitudes under each order of harmonic waves of residual magnetization intensity of a permanent magnet, solving the built Laplace's equations or Poisson's equations, obtaining an expression of a scalar magnetic potential in the solution areas, and further obtaining radial and tangential components of flux densities of the areas. The sectional type Halbach array permanent magnet motor magnetic field calculation method can accurately solve the magnetic field of an inner and outer rotor sectional type Halbach array permanent magnet motor with any magnetic block number of each pole and any number of pole pairs.

Description

technical field [0001] The invention relates to a segmented Halbach array permanent magnet motor. Background technique [0002] The Halbach array of the Halbach array permanent magnet motor generally has two forms, that is, the full-ring Halbach array and the segmented Halbach array. However, since the full-ring Halbach array requires a special magnetizing device and is difficult to process, the segmented Halbach array is commonly used in engineering, that is, the pre-magnetized magnetic blocks are combined and arranged in a specific order to obtain the required In the Halbach array, the magnetic force between the magnetic blocks will inevitably cause gaps between the magnetic blocks, which will affect the air gap magnetic field, and then affect the electromagnetic properties such as the back electromotive force and electromagnetic torque of the motor. The air-gap magnetic field of segmented Halbach array permanent magnet motor is of great significance. [0003] The calcul...

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Problems solved by technology

However, since the full-ring Halbach array requires a special magnetizing device and is difficult to process, the segmented Halbach array is commonly used in engineering, that is, the pre-magnetized magnetic blocks are combined and arranged in a specific order to obtain the required In the Halbach array, the magnetic force between the magnetic blocks will inevitably cause gaps between the magnetic blocks, which will affect the air gap magnetic field, and then affect the electromagnetic properties such as the back electromotive force and electromagnetic torque of the motor. The air gap magnetic field of segmented Halbach array permanent magnet motor is of great significance

[0003] The calculation of the air gap magnetic field generally adopts the analytical method and the finite element method. The calculation result of the finite element method is accurate, but it consumes a long calculation time and takes up a lot of calculation resources. These factors cause a lot of inconvenience to the magnetic field analysis.

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