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Permanent magnet motor rotor eccentric magnetic field calculation method based on hyperbolic cotangent transformation method

A permanent magnet motor, rotor eccentricity technology, applied in design optimization/simulation, special data processing applications, CAD numerical modeling, etc., can solve problems such as error, perturbation method truncation error, etc., to achieve correct and effective analysis, analytical calculation speed Fast, concise and clear results

Active Publication Date: 2021-10-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

The analytical calculation of the eccentric air gap magnetic field of the permanent magnet motor rotor can use the perturbation method. The perturbation method is also called the small parameter method. There is a truncation error in the dynamic method itself, and obvious errors will appear when the eccentricity is large

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  • Permanent magnet motor rotor eccentric magnetic field calculation method based on hyperbolic cotangent transformation method
  • Permanent magnet motor rotor eccentric magnetic field calculation method based on hyperbolic cotangent transformation method
  • Permanent magnet motor rotor eccentric magnetic field calculation method based on hyperbolic cotangent transformation method

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Embodiment Construction

[0085] In order to make the technical means and effects realized by the present invention easy to understand, the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings.

[0086] In this embodiment, in order to facilitate the establishment of the mathematical model, it is assumed that the stator has no slots as follows; the magnetic permeability of the stator and rotor cores is infinite; the analysis area is a two-dimensional plane, and the saturation effect and end effect are ignored; the demagnetization curve of the permanent magnet is linear , the relative permeability μ r =1.

[0087] In this embodiment, the surface-mounted permanent magnet motor outer rotor eccentric motor is used as the analysis object for magnetic field calculation. The schematic diagram of the permanent magnet motor model with eccentric outer rotor is as follows: figure 1 As shown, the analytical region includes the permanent magnet region an...

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Abstract

The invention provides a permanent magnet motor rotor eccentric magnetic field calculation method based on a hyperbolic cotangent transformation method, which comprises the following steps of: 1, transforming an eccentric air gap region of a z plane under an x-y coordinate system into a w plane under a u-v coordinate system through hyperbolic cotangent transformation to obtain two groups of orthogonal eccentric circle clusters representing equipotential lines and magnetic lines, selecting two circles correspondingly coincident with a stator and a rotor of the permanent magnet motor from the eccentric circle cluster representing the equipotential lines, and obtaining the radial magnetic flux density of an eccentric air gap area on a w plane when the magnetic potential difference is 1; 2, calculating the radial magnetic flux density of the uniform air gap area when the stator and the rotor are concentric, and calculating the radial magnetic flux density of the eccentric air gap area and the radial magnetic flux density of the uniform air gap area to obtain a radial specific magnetic conductance function; 3, calculating a uniform air-gap magnetic field when the stator and the rotor are concentric; and 4, correcting the uniform air-gap magnetic field through a radial ratio magnetic conductance function to obtain the air-gap magnetic field when the rotor of the permanent magnet motor is eccentric.

Description

technical field [0001] The invention relates to a method for calculating the eccentric magnetic field of a permanent magnet motor rotor, in particular to a method for calculating the eccentric magnetic field of a permanent magnet motor rotor based on a hyperbolic cotangent transformation method. Background technique [0002] Compared with traditional motors, permanent magnet motors have the advantages of small size, high efficiency, and large speed range. During its assembly and operation, due to many reasons such as manufacturing errors, bearing wear, shaft bending, and external force impact, the rotor will be eccentric. When the rotor is eccentric, an unbalanced magnetic pull will be generated, resulting in noise and torque ripple of the permanent magnet motor. , vibration and other problems, in order to reduce the impact of the above problems, the accurate calculation of the permanent magnet motor rotor eccentric air gap magnetic field has become a research hotspot. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F111/10
CPCG06F30/20G06F2111/10
Inventor 刘蓉晖孙改平米阳唐静李阳赵增凯马天天陈腾韦江川
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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