Accurate conformal mapping-based rotor eccentric analysis method

A technology of rotor eccentricity and conformal mapping, which is applied in the field of rotor eccentricity analysis based on precise conformal mapping

Active Publication Date: 2019-10-18
ZHEJIANG UNIV
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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is the problem that it is difficult to analyze the electromagnetic field under the eccentricity of the motor rotor

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  • Accurate conformal mapping-based rotor eccentric analysis method
  • Accurate conformal mapping-based rotor eccentric analysis method
  • Accurate conformal mapping-based rotor eccentric analysis method

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Embodiment Construction

[0053] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0054] Embodiments of the present invention are as follows:

[0055] Step one, right figure 1 For the eccentric motor shown, the center of the rotor circle is O r , the center of the stator circle is O s , the center of the axis of rotation is O a , the stator inner diameter of the motor is R s , the outer diameter of the rotor is R r . When O a with O r Coincident but not with O s When reclosing, the motor is in static eccentricity; when O a with O s Coincident but not with O r When reclosing, the motor is in dynamic eccentricity; when O a neither with O r Coincident and not with O s When reclosing, the motor is in mixed eccentricity. The air gap area S of the surface-mounted mot...

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Abstract

The invention discloses an accurate conformal mapping-based rotor eccentric analysis method. The rotor eccentric analysis method comprises the following steps of mapping a rotor eccentric surface-mounted motor air gap region to a stator and rotor concentric annular air gap region with a tooth groove by dual-linear mapping, mapping the annular air gap region with the tooth groove to a polygonal airgap region by logarithmic mapping, mapping the polygonal air gap to a rectangular air gap region by Schwarz-Christoffel, and finally, mapping the rectangular air gap region to two groove-less concentric circle air gap regions by index mapping. The electromagnetic field distribution of the groove-less concentric circle air gap regions can be calculated by black square equation, the motor air gap magnetic field distribution under original rotor eccentricity can be obtained by inverse transformation of four conformal mapping, an induction voltage and electromagnetic torque of a rotor eccentric motor are further solved, the calculation time of movable eccentricity and static eccentricity is shorter than finite element calculation time, and a forecast result is completely consistent with a finite element result.

Description

technical field [0001] The invention relates to the field of electromagnetic field analysis of motors, in particular to a method for analyzing rotor eccentricity based on accurate angular mapping. Background technique [0002] The air-gap magnetic field analysis of permanent magnet motor is the basis of motor design and performance calculation, which is usually solved by numerical method or analytical method. The finite element has the characteristics of high calculation accuracy and wide application range, but the calculation time is long, which prolongs the calculation cycle. The analytical method has the characteristics of fast calculation speed, but its accuracy is lower than that of the finite element method. In the initial optimization design process of the motor, the analytical method is generally used for modeling optimization first. After obtaining a suitable basic structure of the motor stator and rotor, the finite element method is used for further optimization ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G06F17/50
CPCG01R31/34G06F30/20
Inventor 黄晓艳李赵凯朱加贝吴立建方攸同
Owner ZHEJIANG UNIV
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