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Subsection skewed pole-shoe type permanent magnet motor rotor

A permanent magnet motor, inclined pole shoe technology, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve the problems of complex manufacturing process, poor utilization of permanent magnets, and reducing the effective shaft length of the motor, etc. To achieve the effect of simplifying the components of the rotor, simplifying the manufacturing process, and weakening the cogging effect

Active Publication Date: 2012-08-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the permanent magnet motor rotor has no measures to limit the axial flux leakage at the end of the segment on the segmented connection surface, it is impossible to avoid the magnetic flux leakage, resulting in poor utilization of the permanent magnets.
[0008] In addition, the method of adding magnetic isolation measures between segments to avoid segmental local magnetic flux leakage suppresses axial magnetic flux leakage between segments, but additional components of the rotor are added, which reduces the effective shaft length of the motor and complicates manufacturing. craft

Method used

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  • Subsection skewed pole-shoe type permanent magnet motor rotor
  • Subsection skewed pole-shoe type permanent magnet motor rotor
  • Subsection skewed pole-shoe type permanent magnet motor rotor

Examples

Experimental program
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specific Embodiment approach 1

[0020] The rotor core 2 in the segmented pole shoe permanent magnet motor rotor is fixed on the shaft 1 through the shaft key 6, the permanent magnet 3 is fixed on the outside of the rotor core 2, and the rotor pole shoe 4 for rationally distributing the magnetic field is placed on the permanent magnet 3 On the outside, the rotor pole piece 4 is divided into several sections in the axial direction, and rotates around the shaft to overlap axially at an angle of θ. The shaft is provided with a shaft key 6 , and the rotor core is provided with a keyway 7 matching with the shaft key 6 .

[0021] The permanent magnet motor rotor is magnetized with radial permanent magnets. The permanent magnet 3 and the iron core 2 are continuous in the axial direction, that is, there is no misalignment in the circumferential direction. The rotation angle θ of the adjacent segmented rotor pole pieces 4 is =360° / [N*LCM(Z 1 ,2p)], N is the number of rotor pole piece 4 segments, Z 1 is the number of ...

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and the segmented pole shoe permanent magnet motor rotor described in Embodiment 1 is that the rotor pole shoe 4 and the rotor core 2 are provided with bolt holes 5, The two axial sections of the rotor are provided with end plates, and the rotor is fixed by tightening bolts and end plates.

[0023] The principle of the invention is: the magnetic flux provided by the permanent magnet of the motor enters the air gap through the rotor pole piece, so the shape of the rotor pole piece can affect the distribution of the magnetic field in the air gap of the motor. When the position of the permanent magnet remains fixed and the rotor pole piece rotates at an appropriate angle in the circumferential direction, the air gap magnetic field distribution also rotates at the same angle relative to the circumferential direction. Based on this, the function of segmented oblique poles of the motor rotor is realized by only segmentally ...

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Abstract

The invention discloses a step skewed pole-shoe type permanent magnet motor rotor. A rotor iron core is fixed on a rotating shaft through a rotating shaft key, a permanent magnet is fixed on the outer side of the rotor iron core, a rotor pole shoe used for reasonably distributing a magnetic field is arranged on the outer side of the permanent magnet, the rotor pole shoe is divided into a plurality of steps in the axial direction and rotates around the rotating shaft for staggering for an angle theta to be axially overlapped, a rotating shaft key is arranged on the rotating shaft, and the rotor iron core is provided with a key slot matched with the rotating shaft key. The permanent magnet and the iron core are continuous in the axial direction, namely can not be misplaced in the circumferential direction, the angle theta staggered in the adjacent steps of rotor pole shoe through rotation is equal to 360 DEG / [N*LCM(Z1,2p)], N represents the quantity of the steps of the rotor pole shoe, Z1 represents the quantity of stator slots, p represents the quantity of motor pole pairs, and LCM(Z1,2p) represents the lowest common multiple of Z1 and 2p. Through axial step regulation of the rotor pole shoe, the purpose of skewing of the rotor is realized, the manufacture process is simplified, and meanwhile, the problem of axial magnetic leakage among the steps due to the rotation of the permanent magnet by step skewing of the common rotor is avoided.

Description

technical field [0001] The invention relates to a rotor of a permanent magnet motor, in particular to a segmented oblique pole shoe type permanent magnet motor rotor. Background technique [0002] Compared with the traditional excitation motor, the permanent magnet motor has the remarkable characteristics of simple structure, small loss, high power factor, high efficiency, high power density, large starting torque, low temperature rise, and light weight. With the continuous improvement and improvement of the magnetic properties of rare earth permanent magnet materials (especially NdFeB permanent magnet materials) and the gradual reduction of prices, the research and development of permanent magnet motors has gradually matured, making permanent magnet motors widely used in national defense, industrial and agricultural production and daily life. etc. have been more and more widely used. [0003] Permanent magnet motor is a motor that relies on permanent magnets installed on t...

Claims

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Application Information

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IPC IPC(8): H02K1/27
Inventor 张建承黄晓艳方攸同马子魁马吉恩卢琴芬董凡印欣
Owner ZHEJIANG UNIV