CN102624116B - Subsection skewed pole-shoe type permanent magnet motor rotor - Google Patents

Subsection skewed pole-shoe type permanent magnet motor rotor Download PDF

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Publication number
CN102624116B
CN102624116B CN2012100790148A CN201210079014A CN102624116B CN 102624116 B CN102624116 B CN 102624116B CN 2012100790148 A CN2012100790148 A CN 2012100790148A CN 201210079014 A CN201210079014 A CN 201210079014A CN 102624116 B CN102624116 B CN 102624116B
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permanent magnet
rotor
rotating shaft
pole
rotating
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CN102624116A (en
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黄晓艳
张建承
方攸同
马吉恩
卢琴芬
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Zhejiang University ZJU
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Zhejiang University ZJU
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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

A kind of segmentation skewed pole-shoe formula permanent magnet machine rotor
Technical field
The present invention relates to the rotor of magneto, relate in particular to a kind of segmentation skewed pole-shoe formula permanent magnet machine rotor.
Background technology
Magneto is compared with traditional excitation electromotor has simple in structure, the distinguishing features such as loss is little, power factor is high, efficiency is high, power density is high, starting torque is large, temperature rise is low, lightweight.Improving constantly and improving and the progressively reduction of price along with rare earth permanent-magnetic material (particularly Nd-Fe-Bo permanent magnet material) magnetic property, the magneto research and development are progressively ripe, make magneto obtain application more and more widely at aspects such as national defence, industrial and agricultural production and daily lifes.
Magneto is to rely on the motor that is arranged on epitrochanterian permanent magnet generation magnetic field, its stator structure and common with/asynchronous machine is basic identical, the stator core that namely consists of silicon steel plate stacking and the stator coil that is embedded in stator coring groove form, thereby and pass to three-phase alternating current produce rotating magnetic field in stator coil.Permanent magnet machine rotor mainly consists of rotor core and permanent magnet, and this is the main distinction of magneto and other types motor, and rotor magnetic circuit structural is the key technology place of magneto.The magnetic structure that rotor adopts is different, and the runnability of motor, control strategy, manufacturing process and use occasion are also different.
Different from the motor of other types, the main field of permagnetic synchronous motor produces by being fixed on the permanent magnet that distributes according to certain rules on rotor, for improving the utilization ratio of permanent magnet, the motor of manufacturing structure compactness, often air gap is less, so the air gap flux density distribution is subjected to the impact of stator slot larger.Operation has attracted cogging torque for motor for this, makes the output torque not steady; Power supply causes the back-emf harmonic wave to increase the weight of for motor, causes power factor (PF) to reduce.
In order to weaken the impact of slot effect, the skewed stator slot form is adopted in the motor manufacturing often, but skewed stator slot can cause the stator slot effective area to reduce, and affects the winding coil rule.And in high power permanent magnet synchronous motor was made, stator winding often adopted the moulding winding, and moulding winding setting-in difficulty in skewed stator slot is high, unsuitable large-scale production.The another kind of method that weakens slot effect is to adopt skewed-rotor, the difficulty of processing of rotor punching, permanent magnet while considering the rotor continuous oblique utmost point, the method equivalence skewed-rotor that therefore adopts the rotor segmentation to misplace.
The oblique utmost point method of segmentation at present commonly used is that rotor integral body is comprised that permanent magnet is divided into several sections, the rotor component parts such as different segmented rotor iron cores, rotating pole-piece structurally there are differences, increased the manufacturing process complexity, be unfavorable for large-scale production, and there is the problem of axial leakage field between segmentation in described segmentation method, has reduced the utilance of permanent magnet.
Chinese patent application has disclosed the permanent magnet machine rotor of the oblique utmost point of a kind of segmentation for No. 201110330939.0, rotor core adopts the same rotor punching to form, axially be divided into equal in length two sections, between the pole center line of corresponding permanent magnet, angle theta arranged separately after the two-stage rotor iron core laminating 3.This permanent magnet machine rotor, owing to not limiting the measure of the axial leakage field of segment end portion on the connection segment face, can't be avoided leakage field, causes permanent magnet to utilize rate variance.
In addition, thereby, although, by in minute intersegmental increase, every the magnetic measure, avoiding occurring that the method for the local leakage field of segmentation has suppressed between segmentation axially leakage field, additionally increased the rotor component part, reduced the effective axial length of motor, complicated manufacturing process.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of segmentation skewed pole-shoe formula permanent magnet machine rotor is provided.
Rotor core in segmentation skewed pole-shoe formula permanent magnet machine rotor by the rotating shaft key be fixed in rotating shaft, permanent magnet is fixed on the rotor core outside, the rotating pole-piece that is used for reasonable layout magnetic field is placed in the permanent magnet outside, rotating pole-piece axially is being divided into some sections, rotating around the shaft the θ angle that staggers axially superposes, be provided with the rotating shaft key in rotating shaft, be provided with the keyway that coordinates with the rotating shaft key in rotor core.
Permanent magnet machine rotor adopts the radial permanent magnet body to magnetize, and described permanent magnet and iron core are continuous in the axial direction, and namely week does not upwards misplace, the angle θ that in the rotating pole-piece of described adjacent sectional, rotation is staggered=360 °/[N*LCM (Z 1, 2p)], N is the rotating pole-piece segments, Z 1For number of stator slots, p is the motor number of pole-pairs, LCM (Z 1, 2p) be Z 1Least common multiple with 2p.
The beneficial effect that the present invention compared with prior art has:
1), only by the axial segmentation adjustment to rotating pole-piece, realize the purpose of skewed-rotor, simplified manufacturing process, compared and the oblique utmost point method of segmentation, can further simplify the rotor element when using with the labyrinth rotor, be conducive to extensive manufacturing.;
2) when weakening slot effect, avoided that the oblique utmost point of general rotor segmentation rotates permanent magnet and the axial problem of leakage field between the segmentation that causes.
Description of drawings
Fig. 1 is the oblique utmost point radial permanent magnet of segmentation rotor leakage situation schematic diagram;
Fig. 2 is segmentation skewed pole-shoe radial permanent magnet rotor schematic diagram;
Fig. 3 is segmentation skewed pole-shoe p-m rotor schematic top plan view;
In figure: rotating shaft 1, rotor core 2, permanent magnet 3, rotating pole-piece 4, bolt hole 5, rotating shaft key 6, keyway 7.
Embodiment
By the oblique utmost point radial permanent magnet of Fig. 1 segmentation rotor leakage field situation schematic diagram as can be known, general segmentation skewed pole rotor structure causes the axial leakage field situation of segmentation to occur in meeting,, below in conjunction with accompanying drawing 2 and Fig. 3, further illustrates the present invention:
Embodiment one:
Rotor core 2 in segmentation skewed pole-shoe formula permanent magnet machine rotor by rotating shaft key 6 be fixed in rotating shaft 1, permanent magnet 3 is fixed on rotor core 2 outsides, the rotating pole-piece 4 that is used for reasonable layout magnetic field is placed in permanent magnet 3 outsides, rotating pole-piece 4 axially is being divided into some sections, rotating around the shaft the θ angle that staggers axially superposes, be provided with rotating shaft key 6 in rotating shaft, be provided with the keyway 7 that coordinates with rotating shaft key 6 in rotor core.
Permanent magnet machine rotor adopts the radial permanent magnet body to magnetize, and described permanent magnet 3 and iron core 2 are continuous in the axial direction, and namely week does not upwards misplace, the angle θ that in the rotating pole-piece 4 of described adjacent sectional, rotation is staggered=360 °/[N*LCM (Z 1, 2p)], N is rotating pole-piece 4 segments, Z 1For number of stator slots, p is the motor number of pole-pairs, LCM (Z 1, 2p) be Z 1Least common multiple with 2p.The medial surface that contacts with permanent magnet 3 in each segmented rotor pole shoe 4 is consistent, and the lateral surface that contacts with air gap staggers along rotating in a circumferential direction.
Embodiment two: the difference of the described a kind of segmentation skewed pole-shoe formula permanent magnet machine rotor of the present embodiment and embodiment one is, described rotating pole-piece 4 and rotor core 2 are provided with bolt hole 5, axial two sections of rotor are provided with end plate, by tightening bolt and end plate fixed rotor.
Principle of the present invention is: the magnetic flux that motor permanent magnet provides enters air gap by rotating pole-piece, so the shape of rotating pole-piece can affect the distribution in motor gas-gap magnetic field.When the permanent magnet position keeps fixing, when rotating pole-piece rotates in a circumferential direction a suitable angle, the air-gap field equal angular that also relatively rotates in a circumferential direction that distributes., based on this, just realized the function of the oblique utmost point of rotor segmentation by the rotation of segmentation only pole shoe.
The described content of this specification embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also reaches conceives the equivalent technologies means that can expect according to the present invention in those skilled in the art.

Claims (1)

1. segmentation skewed pole-shoe formula permanent magnet machine rotor, it is characterized in that rotor core by the rotating shaft key be fixed in rotating shaft, permanent magnet is fixed on the rotor core outside, the rotating pole-piece that is used for reasonable layout magnetic field is placed in the permanent magnet outside, rotating pole-piece axially is being divided into some sections, rotating around the shaft the θ angle that staggers axially superposes, be provided with the rotating shaft key in rotating shaft, be provided with the keyway that coordinates with the rotating shaft key in rotor core; Permanent magnet machine rotor adopts the radial permanent magnet body to magnetize, and described permanent magnet and iron core are continuous in the axial direction, and namely week does not upwards misplace, the angle θ that in the rotating pole-piece of described adjacent sectional, rotation is staggered=360 °/[N*LCM (Z 1, 2p)], N is the rotating pole-piece segments, Z 1For number of stator slots, p is the motor number of pole-pairs, LCM (Z 1, 2p) be Z 1Least common multiple with 2p.
CN2012100790148A 2012-03-23 2012-03-23 Subsection skewed pole-shoe type permanent magnet motor rotor Active CN102624116B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104852491A (en) * 2015-05-14 2015-08-19 无锡信捷电气股份有限公司 Method of designing segmented oblique polar angle of permanent magnet synchronous motor magnet steel
CN110994828B (en) * 2019-12-18 2021-01-26 杭州易泰达科技有限公司 Rotor oblique pole structure for improving running characteristic of synchronous reluctance motor
CN114498977A (en) * 2021-12-27 2022-05-13 华为数字能源技术有限公司 Rotor core, rotor, motor driving system and electric vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849682A (en) * 1973-06-19 1974-11-19 Nat Res Dev Permanent magnet rotor for alternating current generators and motors
WO1991016754A1 (en) * 1990-04-24 1991-10-31 Toeroek Vilmos Synchronous machine
WO2009026690A2 (en) * 2007-08-24 2009-03-05 Sunco Investments Ltd. Multistage variable reluctance motor/generator
CN202524197U (en) * 2012-03-23 2012-11-07 浙江大学 Segmental skewed pole shoe type permanent magnet motor rotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849682A (en) * 1973-06-19 1974-11-19 Nat Res Dev Permanent magnet rotor for alternating current generators and motors
WO1991016754A1 (en) * 1990-04-24 1991-10-31 Toeroek Vilmos Synchronous machine
WO2009026690A2 (en) * 2007-08-24 2009-03-05 Sunco Investments Ltd. Multistage variable reluctance motor/generator
CN202524197U (en) * 2012-03-23 2012-11-07 浙江大学 Segmental skewed pole shoe type permanent magnet motor rotor

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Inventor after: Huang Xiaoyan

Inventor after: Zhang Jiancheng

Inventor after: Fang Youtong

Inventor after: Ma Jien

Inventor after: Lu Qinfen

Inventor before: Zhang Jiancheng

Inventor before: Huang Xiaoyan

Inventor before: Fang Youtong

Inventor before: Ma Zikui

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Inventor before: Lu Qinfen

Inventor before: Dong Fan

Inventor before: Yin Xin

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Free format text: CORRECT: INVENTOR; FROM: ZHANG JIANCHENG HUANG XIAOYAN FANG YOUTONG MA ZIKUI MA JIEN LU QINFEN DONGFAN YIN XIN TO: HUANG XIAOYAN ZHANG JIANCHENG FANG YOUTONG MA JIEN LU QINFEN

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