Motor

A motor rotor, trapezoidal technology, applied in the direction of magnetic circuit shape/style/structure, magnetic circuit rotating parts, etc., can solve the problems of unobvious improvement of flat-top wave waveform, increased assembly difficulty, increased amount of magnetic steel, etc., to achieve improvement Effects of air gap magnetic density waveform, increasing reluctance torque component, and reducing harmonics

Inactive Publication Date: 2013-08-28
HANGZHOU DEWOS ELECTRIC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of V-shaped magnets does not significantly improve the flat-top wave waveform. At the same time, the use of inverted triangle magnets increases the amount of magnets, increases the flux leakage, and increases the difficulty of assembly.

Method used

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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0014] Such as image 3 The motor rotor of the shown motor includes a rotor core 1, a trapezoidal magnetic steel 3 and a trapezoidal magnetic steel groove 2, and the rotor core 1 is a core formed by stacking rotor punches. The rotor core 1 is evenly distributed with the same trapezoidal magnetic steel grooves 2 axially penetrating, and the adjacent trapezoidal magnetic steel grooves 2 are V-shaped radially symmetrically distributed relative to the rotor core 1, and the angle of the V shape is greater than 0° and less than 180° °, and the V-shaped opening faces the outer circle of the rotor core 1, and the corresponding trapezoidal magnetic steel 3 is embedded in each trapezoidal magnetic steel groove 2 alternately according to N pole and S pole.

[0015] Since the trapezoidal magnetic steel groove 2 and the trapezoidal magnetic steel 3 of the m...

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Abstract

The invention relates to the technical field of a motor, and aims at providing the motor. The motor comprises a motor rotor. The motor rotor comprises a rotor iron core, trapezoid magnetic steel and trapezoid magnetic steel grooves. At least two same trapezoid magnetic steel grooves which are penetrated in the axial direction are formed in the rotor iron core. The adjacent trapezoid magnetic steel grooves which are symmetrically distributed in the radial direction corresponding to the rotor iron core are of a V shape, an opening of the V shape is towards an outer circle of the rotor iron core, the corresponding trapezoid magnetic steel is embedded in the trapezoid magnetic steel grooves in an alternating mode according to an N pole and an S pole. The magnetic steel grooves and the magnetic steel of the motor rotor are trapezoid, magnetic circuits and magnetic reluctance of a direct-axis (d-axis) evenly change in the peripheral direction, on the basis of preserving a number of advantages of the V-shaped magnetic steel, air-gap magnetic flux density waveforms are improved, the number of harmonic waves is reduced, magnetic reluctance torque weight of the motor is increased, and torque ripple of the motor is reduced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a motor. Background technique [0002] Analysis at home and abroad shows that the permanent magnet motor has the characteristics of high torque density and power density, which makes the permanent magnet brushless motor more and more the best choice for the electric drive system of electric vehicles. At present, the magnetic steel of the motor with embedded rotor structure is mostly rectangular, which is convenient to process, but at the same time, the air gap flux density between the outer surface of the rotor and the stator will be close to the flat-top wave, which contains more harmonics, which will affect the back EMF. , Cogging torque and torque ripple etc. cause adverse effects. The traditional solution is to use V-shaped or inverted triangle magnets on the basis of rectangular motor magnets, or make the outer surface of the motor rotor into an arc-shaped surface with uneve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
Inventor 曹冠晖吴进山
Owner HANGZHOU DEWOS ELECTRIC TECHNOLOGY CO LTD
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