CN108599415B - High-speed permanent magnet motor rotor with combined magnetic conductive sheath - Google Patents
High-speed permanent magnet motor rotor with combined magnetic conductive sheath Download PDFInfo
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- CN108599415B CN108599415B CN201810400499.3A CN201810400499A CN108599415B CN 108599415 B CN108599415 B CN 108599415B CN 201810400499 A CN201810400499 A CN 201810400499A CN 108599415 B CN108599415 B CN 108599415B
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- magnetizer
- rotor
- permanent magnet
- sheath
- outer edge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
Abstract
The invention discloses a high-speed permanent magnet motor rotor with a combined type magnetic conduction sheath, which comprises a rotating shaft, a rotor core and the combined type magnetic conduction sheath which are sequentially arranged from inside to outside, wherein a permanent magnet is arranged between the rotor core and the combined type magnetic conduction sheath, the combined type magnetic conduction sheath comprises magnetizers and non-magnetizers, the magnetizers and the non-magnetizers are arranged in a staggered mode along the circumferential direction of the combined type magnetic conduction sheath, the magnetizers and the non-magnetizers are fixedly connected and form electric insulation, and the number of the magnetizers and the number of the non-magnetizers are the same as the number of poles of a motor. The structure disclosed by the invention can reduce eddy current loss in the sheath, inhibit the temperature rise of the rotor, reduce the using amount of the permanent magnet and improve the torque output capability of the motor.
Description
Technical Field
The invention relates to a motor rotor, in particular to a high-speed permanent magnet motor rotor with a combined magnetic conductive sheath, and belongs to the technical field of motors.
Background
On the premise of a certain electromagnetic load, the improvement of the rotating speed of the permanent magnet motor is a main measure for improving the power density. In order to counteract the centrifugal force acting on the permanent magnet at high rotating speed, the traditional inner rotor surface-mounted permanent magnet motor mostly adopts a non-magnetic-conductive sheath to restrain the permanent magnet, and common non-magnetic-conductive materials comprise fiber composite materials, high-strength non-magnetic-conductive alloys and the like. Due to the non-magnetic-conduction sheath, the effective air gap length between the stator and the rotor and the magnetic circuit reluctance are increased, the air gap flux density amplitude and the motor inductance value are reduced, and the using amount of the permanent magnet is greatly increased. The composite material has low heat conductivity, so that the composite material is not beneficial to the heat dissipation of a high-speed motor rotor, and the alloy sheath in the high-speed permanent magnet motor is widely used.
In addition, as shown in fig. 1, a surface-mounted rotor structure of the prior art uses an integral alloy sheath 100, which is integrally machined from one material or welded from multiple materials, the integral alloy sheath 100 is not segmented along the circumferential direction, and the alloy sheath 100 and the permanent magnet 101 are in interference fit to prevent the permanent magnet 101 from moving during operation. Because the air-gap magnetic field contains more tooth harmonics, space harmonics caused by armature magnetic potential and time harmonics generated by non-sinusoidal input current, the eddy current loss in the alloy sheath 100 is large, and the feasibility of further improving the rotating speed of the high-speed motor and reducing the air-gap length is limited.
The prior art mainly adopts the following method to solve the problems: a higher-strength sheath material is adopted; adding a new shielding layer on the alloy sheath; optimizing the physical properties of the alloy material; the slot pole matching with less harmonic content is adopted; the switching frequency of the inverter and the oil cooling of the rotor are increased. However, these measures have complex process, poor reliability and high cost, and may cause other problems such as reduction of power density of the high-speed permanent magnet motor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-speed permanent magnet motor rotor with a combined magnetic conducting sheath, which solves the problems of poor heat dissipation, large eddy current loss and the like of the existing high-speed permanent magnet motor rotor structure.
The technical scheme of the invention is as follows: the utility model provides a high-speed permanent-magnet machine rotor that contains combination formula magnetic conduction sheath, includes pivot, rotor core and combination formula magnetic conduction sheath that sets gradually from inside to outside, be equipped with the permanent magnet between rotor core and the combination formula magnetic conduction sheath, combination formula magnetic conduction sheath includes magnetizer and non-magnetizer, magnetizer and non-magnetizer set up along combination formula magnetic conduction sheath circumference is crisscross, fixed connection and formation electrical insulation between magnetizer and the non-magnetizer, the quantity of magnetizer and the quantity of non-magnetizer are the same with the motor pole number.
Furthermore, the outer edge of the magnetizer and the outer edge of the non-magnetizer are arcs which are not concentric with the outer edge of the high-speed permanent magnet motor rotor and have a radius smaller than that of the outer edge of the high-speed permanent magnet motor rotor.
Furthermore, the outer edge of the magnetizer and the outer edge of the non-magnetizer are arcs which are concentric with the outer edge of the high-speed permanent magnet motor rotor and have the radius equal to that of the outer edge of the high-speed permanent magnet motor rotor.
Furthermore, the magnetizer is formed by laminating a plurality of magnetic conductive sheets along the axial direction of the rotating shaft, and electric insulation is formed among the magnetic conductive sheets.
Preferably, a first electric insulating layer is arranged between the magnetic conducting sheets.
Furthermore, the magnetizer and the non-magnetizer are clamped by a key slot, and a second electric insulating layer is arranged on the joint surface of the magnetizer and the non-magnetizer.
Further, the rotating shaft and the rotor core are integrally made of a magnetic conductive material.
The technical scheme provided by the invention has the advantages that:
1. the combined magnetic conduction sheath is provided with magnetizers and non-magnetizers which are arranged in a staggered mode in the circumferential direction to form electric insulation, so that an eddy current circulation path in the combined magnetic conduction sheath is cut off, eddy current loss in the sheath is reduced, and temperature rise of the rotor is inhibited.
2. The outer edge of the magnetizer and the outer edge of the non-magnetizer are not concentric with the rotor, and the radius of the magnetizer and the outer edge of the non-magnetizer is smaller than the radius of the rotor, so that unequal air gaps are realized, and the sine degree of the magnetic density waveform of the no-load air gap is higher.
3. The flux conductors of the lamination further reduce eddy current losses in the jacket.
4. The magnetizer part of the combined type magnetic conduction sheath reduces the effective air gap length and reduces the using amount of the permanent magnet on the premise of the same air gap flux density amplitude.
5. The magnetic circuit reluctance is reduced, the motor inductance and the salient pole rate are increased, and the suppression of output current harmonic waves on the control side of the high-speed permanent magnet motor is facilitated. The quadrature axis inductance and the direct axis inductance are different, and the reluctance torque can be utilized to improve the torque output capacity of the motor.
Drawings
Fig. 1 is a schematic structural view of a surface-mounted rotor of the prior art.
Fig. 2 is a schematic cross-sectional structure diagram of the rotor of the high-speed permanent magnet motor with the combined magnetic conductive sheath according to the present invention.
Fig. 3 is a perspective view of a quarter structure of the high-speed permanent magnet motor rotor with the combined magnetic conductive sheath according to the present invention.
Detailed Description
The present invention is further described in the following examples, which are intended to be illustrative only and not to be limiting as to the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which would occur to persons skilled in the art upon reading the present specification and which are intended to be within the scope of the present invention as defined in the appended claims.
Referring to fig. 2 and fig. 3, the high-speed permanent magnet motor rotor with the combined magnetic conducting sheath according to the present embodiment is a four-pole rotor, and the rotor structure includes a rotating shaft 1, a rotor core 2, and the combined magnetic conducting sheath from inside to outside in sequence, where the rotating shaft 1 and the rotor core 2 are both made of 45# magnetic conducting steel, and a through hole for press-fitting the rotating shaft 1 is formed in the center of the rotor core 2. Rotor core 2 and pivot 1 adopt interference fit, and pivot 1 is connected with external load. The combined type magnetic conduction sheath comprises four magnetizers 3 and four non-magnetizers 4, and the magnetizers 3 and the non-magnetizers 4 are arranged in a staggered and equally-divided mode along the circumferential direction of the combined type magnetic conduction sheath. The non-magnetic conductive body 4 is made of GH4169 high-strength alloy steel and is fixedly connected with the rotor core 2 through the first key slot 5. The magnetizer 3 is arranged between the two non-magnetizers 4, the magnetizer 3 is formed by axially laminating 60 permalloy thin plates 3a with the thickness of 1mm, insulating paint is coated between the permalloy thin plates 3a to form a first insulating layer, and the eddy current is cut off along the axial circulation path. The magnetizer 3 is connected with the non-magnetizer 4 through the second key slot 6, and a second electric insulation layer is formed on the joint surface of the magnetizer 3 and the non-magnetizer 4 through a thermal spraying process and epoxy resin adhesive bonding so as to achieve the electric insulation effect, cut off the eddy current circulation path in the sheath and reduce the eddy current loss.
In this embodiment, the outer edges of the magnetizer 3 and the non-magnetizer 4 are both circular arcs, and the circular arcs are not concentric with the outer edge of the rotor. The radius of the arc is 26.5mm, which is smaller than the radius of the outer edge of the rotor, so as to optimize the no-load air gap flux density of the motor. A neodymium iron boron permanent magnet 7 is arranged between the magnetizer 3 and the rotor core 2, and the permanent magnet 7 is magnetized in a direction parallel to the symmetry axis of the permanent magnet to increase the amplitude of the air gap flux density fundamental wave of the motor. The permanent magnet 7 and the magnetizer 3 can adopt interference fit, and the permanent magnet 7 is guaranteed to bear compressive stress all the time in the operation process.
It should be noted that in the above embodiment, the outer edges of the magnetic conductor 3 and the non-magnetic conductor 4 may also be in the shape of a circular arc concentric with and having the same radius as the outer edge of the rotor, which does not affect the effect of reducing eddy current loss. The rotating shaft 1 and the rotor core 2 can also be made of magnetic conductive materials integrally without being manufactured separately and then matched in a connecting way.
Claims (6)
1. The utility model provides a high-speed permanent-magnet machine rotor that contains combination formula magnetic conduction sheath, includes pivot, rotor core and combination formula magnetic conduction sheath that sets gradually from inside to outside, be equipped with the permanent magnet between rotor core and the combination formula magnetic conduction sheath, its characterized in that, combination formula magnetic conduction sheath includes magnetizer and non-magnetizer, magnetizer and non-magnetizer set up along combination formula magnetic conduction sheath circumference is crisscross, adopt the keyway joint between magnetizer and the non-magnetizer, the composition surface of magnetizer and non-magnetizer is equipped with the second electrical insulation layer and makes form electrical insulation between magnetizer and the non-magnetizer, the quantity of magnetizer and the quantity of non-magnetizer are the same with the motor pole number.
2. The rotor of claim 1, wherein the outer edge of the magnetizer and the outer edge of the non-magnetizer are arcs that are not concentric with the outer edge of the rotor of the high-speed permanent magnet motor and have a radius smaller than the outer edge of the rotor of the high-speed permanent magnet motor.
3. The rotor of claim 1, wherein the outer edge of the magnetizer and the outer edge of the non-magnetizer are arcs concentric with and equal in radius to the outer edge of the rotor of the high-speed permanent magnet motor.
4. The rotor of a high-speed permanent magnet motor with a combined magnetic conducting sheath according to claim 1, wherein the magnetic conductor is formed by laminating a plurality of magnetic conducting sheets along the axial direction of the rotating shaft, and the magnetic conducting sheets are electrically insulated from each other.
5. The rotor of a high-speed permanent magnet electric machine comprising a combined magnetically permeable sheath of claim 4, wherein a first electrically insulating layer is disposed between the magnetically permeable sheets.
6. The rotor of a high-speed permanent magnet electric machine with a combined magnetically conductive sheath of claim 1, wherein the shaft and the rotor core are integrally formed of magnetically conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810400499.3A CN108599415B (en) | 2018-04-28 | 2018-04-28 | High-speed permanent magnet motor rotor with combined magnetic conductive sheath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810400499.3A CN108599415B (en) | 2018-04-28 | 2018-04-28 | High-speed permanent magnet motor rotor with combined magnetic conductive sheath |
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| Publication Number | Publication Date |
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| CN108599415A CN108599415A (en) | 2018-09-28 |
| CN108599415B true CN108599415B (en) | 2020-02-18 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107749678A (en) * | 2017-11-27 | 2018-03-02 | 北京交通大学 | A kind of permanent magnet machine rotor sheath cooling structure device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6705139B2 (en) * | 2001-06-15 | 2004-03-16 | Lincoln Tsai | Magnetic lock mechanism |
| CN201119249Y (en) * | 2007-11-27 | 2008-09-17 | 沈阳工业大学 | A shielding cover |
| US8415854B2 (en) * | 2008-07-28 | 2013-04-09 | Direct Drive Systems, Inc. | Stator for an electric machine |
| WO2010133496A1 (en) * | 2009-05-22 | 2010-11-25 | Arcelik Anonim Sirketi | An electric motor having a permanent magnet rotor |
| CN101924445B (en) * | 2010-09-01 | 2012-01-25 | 哈尔滨工业大学 | Permanent magnetic synchronous motor in wide weak-magnetic speed-regulating range |
| CN202721522U (en) * | 2012-08-30 | 2013-02-06 | 湘电莱特电气有限公司 | Rotor for high speed permanent magnet synchronous motor |
| CN203554102U (en) * | 2013-11-12 | 2014-04-16 | 中山大洋电机股份有限公司 | Permanent magnetic motor structure reducing torque ripple of surface mounted permanent magnet rotor |
| CN104852495A (en) * | 2015-05-21 | 2015-08-19 | 浙江大学 | Permanent magnet fixing structure of surface-mounted high speed permanent magnet motor |
| CN107612166A (en) * | 2017-09-22 | 2018-01-19 | 沈端劼 | A kind of rotor with stacked protective metal shell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107749678A (en) * | 2017-11-27 | 2018-03-02 | 北京交通大学 | A kind of permanent magnet machine rotor sheath cooling structure device |
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