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Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure

A permanent magnet motor and magnetic field analysis technology, which is applied in the control of generators, motor generator control, electronic commutation motor control, etc. uniform distribution etc.

Active Publication Date: 2014-11-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic field analysis method can quickly and accurately calculate the magnetic field distribution of the motor, but because the skewed slot will cause the radial component and tangential component of the motor air gap magnetic field to be unevenly distributed along the axial direction, the magnetic field analysis calculation process is relatively complicated, and has not been applied to the stator skewed slot In the magnetic field analysis of surface mount permanent magnet motor

Method used

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  • Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure
  • Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure
  • Magnetic field analytic calculating method for surface-mounted permanent magnet motor with tilted trough structure

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Experimental program
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Embodiment 1

[0034] 101: Divide the motor axially into N in three-dimensional space z The solution domain of the segmental magnetic field, and calculate the axial length of each segment of the motor, and the center position angle of the slot body and the notch;

[0035] This step is specifically as follows: Simplify the actual motor structure and parameters: ignore the saturation of the iron core, assume that the magnetic permeability is infinite; assume that the demagnetization curve of the permanent magnet material is linear; ignore the conductivity and eddy current effect of the ferromagnetic material; simplify the stator slot and notch as Fan-shaped structure; motor end effects are ignored. Divide the motor axially into N in three-dimensional space z Segment magnetic field solution domain, and calculate the axial length of each motor segment, and the center position angle of slots and notches.

[0036] The axial length L of the solution domain of the jth magnetic field zj for

[00...

Embodiment 2

[0061] The invention is applicable to the calculation and performance analysis of the magnetic field of the surface-mounted permanent magnet motor with the stator chute, and the optimization design process of the angle of the stator chute. The technical scheme and operation process of the present invention will be described below with specific examples.

[0062] In order to facilitate the establishment of the magnetic field analysis model in the present invention, the motor end effect and saturation effect are ignored, the magnetic permeability is assumed to be infinite, the demagnetization curve of the permanent magnet material is assumed to be linear, the conductivity of the ferromagnetic material and the eddy current effect are ignored, and the stator slot and slot The mouth is simplified to a fan-shaped structure. The stator structure of the surface-mounted permanent magnet motor with stator chute is as follows: figure 1 shown. In this embodiment, the motor is divided in...

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Abstract

The invention discloses a magnetic field analytic calculating method for a surface-mounted permanent magnet motor with a tilted trough structure and relates to the field of permanent magnet motor magnetic field calculating technologies. The magnetic field analytic calculating method comprises the following steps: a motor is axially divided into Nz sections of magnetic field solution domains in three-dimensional space, each section of magnetic field solution domain is divided into four sub-domains, the magnetic vector potential partial differential equations of the sub-domains of each section are built respectively, the general solutions of the sub-domains of each section solution domain are worked out by adopting the separation quantity method, and the boundary conditions among the sub-domains of each solution domain are built to determine fourier coefficient values; the definite expressions of the magnetic vector potential partial differential equations of the sub-domains, namely, the magnetic vector potential functions of the sub-domains, are worked out; air gap magnetic flux density expressions are calculated based on the magnetic vector potential functions of the sub-domains, and the magnetic linkage, the cogging torque, the counter emf and the electromagnetic torque of the motor can be further calculated. According to the invention, the magnetic field calculation and performance analysis of the surface-mounted permanent magnet motor provided with a stator tilted trough can be conducted rapidly and accurately.

Description

technical field [0001] The invention relates to the technical field of magnetic field calculation of permanent magnet motors, in particular to an analytical calculation method for the magnetic field of a surface-mounted permanent magnet motor with a chute structure. Background technique [0002] Permanent magnet motors have the advantages of high efficiency and high power density, making them widely used in aerospace, national defense and military, industrial production, automobile transportation, and household appliances. However, in high-performance drive systems, torque ripple often becomes one of the key considerations. The chute can not only eliminate the cogging torque of the permanent magnet motor, but also play a certain role in weakening the back EMF harmonic and the electromagnetic torque harmonic, and has a wide range of applications in the actual motor production. [0003] Magnetic field calculation is the basis and premise of motor parameter calculation, perfor...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 夏长亮张振
Owner TIANJIN UNIV
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