CN112383159B - Spoke type permanent magnet synchronous motor rotor structure - Google Patents
Spoke type permanent magnet synchronous motor rotor structure Download PDFInfo
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- CN112383159B CN112383159B CN202010658558.4A CN202010658558A CN112383159B CN 112383159 B CN112383159 B CN 112383159B CN 202010658558 A CN202010658558 A CN 202010658558A CN 112383159 B CN112383159 B CN 112383159B
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- Prior art keywords
- permanent magnets
- distributed
- spoke
- magnetic bridge
- permanent magnet
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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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention discloses a novel spoke type permanent magnet synchronous motor rotor structure which comprises a rotor core and permanent magnets embedded in the rotor core, wherein the permanent magnets comprise an inner layer and an outer layer, the outer layer is first permanent magnets uniformly distributed in a spoke shape, the inner layer is second permanent magnets uniformly distributed in a circular ring shape and close to the end parts of the first permanent magnets, the magnetizing direction of the first permanent magnets distributed in the spoke shape is parallel to the circumferential tangential direction of the rotor core, and the second permanent magnets distributed in the circular ring shape can be magnetized in the radial direction or in parallel. The invention has the beneficial effects that: the problem of current spoke permanent-magnet machine end part magnetic leakage is solved.
Description
Technical Field
The invention belongs to the field of permanent magnet synchronous motor rotors, and particularly relates to a spoke type permanent magnet synchronous motor rotor structure.
Background
The permanent magnet synchronous motor utilizes the permanent magnet to provide excitation, reduces the requirement on current excitation, and can improve the overall efficiency and reduce the volume of the system. Because application occasions such as a servo system and a new energy automobile require a driving system to have smaller volume and higher efficiency, a high-performance permanent magnet synchronous motor becomes the development direction of a driving motor.
The spoke permanent magnet rotor can improve the torque density of the permanent magnet motor, but the magnetic leakage of the end part of a magnet of the conventional spoke permanent magnet rotor is large, so that the torque density of the motor is reduced. At present, three main schemes are provided for relieving the problem of end magnetic leakage, namely, on the premise of meeting the requirement of mechanical strength, an end magnetic bridge is reserved, and the magnetic resistance of a magnetic leakage magnetic circuit is improved; secondly, the magnetic resistance of the magnetic leakage magnetic circuit is improved by removing the end magnetic bridge; and thirdly, replacing the end magnetic bridge with an additional permanent magnet. Both the second and third solutions require the use of special mechanical parts to fix the rotor core and magnets to ensure that the rotor does not disintegrate. The first proposal reduces the magnetic leakage, but the magnetic leakage still exists, and reduces the torque density; although the second scheme and the third scheme can achieve the purpose of reducing the end magnetic leakage, the mechanical integrity and the mechanical strength of the rotor are reduced due to the cancelled end magnetic bridge, and the difficulty of processing and manufacturing the rotor is increased by special mechanical parts, so that the cost is increased.
Disclosure of Invention
The invention discloses a spoke type permanent magnet synchronous motor rotor structure, which aims to solve the problem of magnetic leakage at the end part of a permanent magnet of the conventional spoke type permanent magnet motor.
The specific scheme is as follows:
the utility model provides a spoke formula PMSM rotor structure, its characterized in that includes rotor core and inlays the permanent magnet of establishing in rotor core, the permanent magnet includes inside and outside two-layer, wherein the outer first permanent magnet that is spoke form evenly distributed, the inlayer is for being the second permanent magnet that ring form evenly distributed and be close to first permanent magnet tip, and wherein, the magnetization direction that is spoke form distribution's first permanent magnet is parallel with rotor core's circumference tangential, and the second permanent magnet that is ring form distribution can radially magnetize, also can magnetize in parallel.
As a further improvement of the invention, the second permanent magnets distributed in a circular ring shape are close to the end part, far away from the motor air gap, of the first permanent magnets distributed in a spoke shape, and are separated from the first permanent magnets distributed in a spoke shape by the first magnetic bridge.
As a further improvement of the invention, the magnets of the second permanent magnets distributed in a circular ring shape are separated by second magnetic bridges, the first magnetic bridges are arranged between the first permanent magnets distributed in a spoke shape and the second permanent magnets distributed in a circular ring shape, and the first magnetic bridges are connected with the yoke part of the rotor through the second magnetic bridges.
As a further improvement of the present invention, the first magnetic bridge and the second magnetic bridge form a T-shaped magnetic bridge, wherein the minimum width of the first magnetic bridge is G, the minimum width of the second magnetic bridge is H, and the width of the spoke-shaped first permanent magnet near the first magnetic bridge is W, so that G, H, and W meet the following restriction conditions, i.e. 0< H <0.5W, 0< G < 0.4W; an included angle formed by any two points in the second magnetic bridge and a connecting line of the circle centers of the sections of the rotors is alpha, an included angle formed by two end points of the first permanent magnets which are distributed in a spoke shape and close to one side of the first magnetic bridge and the connecting line of the circle centers of the sections of the rotors is beta, alpha and beta meet the following limiting condition, alpha is less than beta, and two edges of the included angle alpha are positioned in the included angle beta.
As a further development of the invention, the rotor core is of multi-pole design.
As a further improvement of the invention, the rotor core is constructed of laminations of magnetic material.
As a further development of the invention, the rotor core cross section is continuous.
Has the advantages that:
the invention not only keeps the end magnetic bridge, but also has continuous rotor iron core, does not depend on special mechanical parts, and has simple structure and low manufacturing cost. The flux linkage provided by the permanent magnets distributed in the annular shape can improve the saturation degree of the magnetic bridge and the magnetic resistance of a magnetic leakage magnetic circuit, so that the magnetic leakage is reduced. In addition, the permanent magnets distributed annularly can provide additional rotor flux linkage, and the torque density of the motor is further improved.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention. (arrows show possible directions of magnetization)
Fig. 2 is an exploded view of the present invention.
Fig. 3 is a schematic plan view of a rotor core according to the present invention.
Fig. 4 is a schematic plan view of the first permanent magnets in a spoke-like arrangement in the present invention.
Fig. 5 is a schematic plan view of the second permanent magnets distributed in a circular ring shape in the present invention.
FIG. 6 is a partial enlarged view of the T-shaped magnetic bridge of the present invention.
List of reference numerals:
1-rotor core, 2-first permanent magnet, 3-second permanent magnet, 4-first magnetic bridge, 5-second magnetic bridge, 6-rotor yoke.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention.
As shown in fig. 1 to 6, the present invention includes a rotor core 1, a first permanent magnet 2 distributed in a spoke shape, and a second permanent magnet 3 distributed in an annular shape. The rotor core 1 is continuous in cross section, has a cylindrical outer surface and an inner surface, and has a plurality of hollow slots therein for mounting permanent magnets. As shown in figure 1, the first permanent magnets 2 distributed in a spoke shape are uniformly distributed along the circumference of the rotor, one end of each magnet is close to the outer diameter of a rotor iron core, the other end of each magnet is close to a rotating shaft, the magnetizing direction is parallel to the circumferential tangential direction, and the north and south poles are alternately changed along the circumference. The second permanent magnets 3 distributed in a circular ring shape are close to the rotor rotating shaft and are uniformly distributed along the circumferential direction, the magnetizing direction is along the radial direction, and the north and south poles are alternately changed along the circumference.
As shown in fig. 1, the second permanent magnets 3 distributed in a ring shape are separated from the first permanent magnets 2 distributed in a spoke shape by the first magnetic bridges 4. The magnets of the second permanent magnet 3 distributed in a ring shape are separated by a second magnetic bridge 5. The first magnetic bridge 4 and the second magnetic bridge 5 form a T-shaped structure, namely, the first permanent magnets 2 distributed in a spoke shape are arranged above the T-shaped structure, and the second permanent magnets 3 distributed in a circular ring shape are arranged on two sides of the lower part of the T-shaped structure. The first magnetic bridge 4 and the second magnetic bridge 5 are both part of the rotor core 1.
As shown in fig. 3, the second magnetic bridge 5 separates the second permanent magnets 3 distributed in a circular ring shape, and the second magnetic bridge 5 connects the first magnetic bridge 4 and the rotor yoke 6.
As shown in fig. 3, the T-shaped structure formed by the first magnetic bridge 4 and the second magnetic bridge 5 realizes the integration of the rotor core structure, improves the mechanical strength of the rotor, and reduces the processing difficulty of the rotor core.
As shown in fig. 1, the first permanent magnets 2 distributed in a spoke shape have alternating north and south poles, and the generated flux linkages strengthen each other at the rotor core, so that the magnetic flux concentration effect is achieved. The magnetizing direction of the second permanent magnets 3 distributed in a ring shape enables the flux linkage generated by the second permanent magnets to be consistent with the flux linkage direction generated by the first permanent magnets 2 distributed in a spoke shape, and the rotor flux linkage is further strengthened.
As shown in fig. 1, first magnetic bridge 4 is the magnetic leakage magnetic circuit that is spoke form first permanent magnet 2 who distributes, also is the magnetic leakage magnetic circuit that is the second permanent magnet 3 that ring form distributes, and the first permanent magnet 2 that is spoke form distribution is the same with the 3 magnetic leakage magnetic field directions of second permanent magnet that are ring form and distribute in addition, leads to first magnetic bridge 4 serious saturation, has improved the magnetic resistance of magnetic leakage magnetic circuit, has reduced the magnetic leakage.
As shown in fig. 6, the first magnetic bridge 4 and the second magnetic bridge 5 form a T-shaped magnetic bridge, where the minimum width of the first magnetic bridge 4 is G, the minimum width of the second magnetic bridge 5 is H, and the width of the spoke-shaped permanent magnet near the first magnetic bridge 4 is W, then the G, H, and W satisfy the following constraint conditions, that is, 0< H <0.5W, and 0< G < 0.4W. The included angle formed by any two points in the second magnetic bridge 5 and the connecting line of the circle centers of the rotor sections is alpha, the included angle formed by two end points of the spoke-shaped permanent magnets close to one side of the first magnetic bridge 4 and the connecting line of the circle centers of the rotor sections is beta, alpha and beta meet the following limiting conditions, alpha is less than beta, and two edges of the included angle alpha are positioned within the included angle beta.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (4)
1. A spoke type permanent magnet synchronous motor rotor structure is characterized by comprising a rotor core and permanent magnets embedded in the rotor core, wherein the permanent magnets comprise an inner layer and an outer layer, the outer layer is first permanent magnets which are uniformly distributed in a spoke shape, the inner layer is second permanent magnets which are uniformly distributed in a circular ring shape and close to the end parts of the first permanent magnets, the magnetizing direction of the first permanent magnets which are distributed in the spoke shape is parallel to the circumferential tangential direction of the rotor core, and the second permanent magnets which are distributed in the circular ring shape can be magnetized in the radial direction and can also be magnetized in the parallel direction; the second permanent magnets distributed in a ring shape are close to the end part, far away from the motor air gap, of the first permanent magnets distributed in a spoke shape, and are separated from the first permanent magnets distributed in spoke shape sections through a first magnetic bridge; each magnet of the second permanent magnets distributed in a circular ring shape is separated by a second magnetic bridge, a first magnetic bridge is arranged between the first permanent magnets distributed in a spoke shape and the second permanent magnets distributed in a circular ring shape, and the first magnetic bridge is connected with the yoke part of the rotor through the second magnetic bridge; the first magnetic bridge and the second magnetic bridge form a T-shaped magnetic bridge, wherein the minimum width of the first magnetic bridge is G, the minimum width of the second magnetic bridge is H, the width of the spoke-shaped first permanent magnet close to one side of the first magnetic bridge is W, and the G, the H and the W meet the following limiting conditions, namely H is more than 0 and less than 0.5W, G is more than 0 and less than 0.4W; an included angle formed by any two points in the second magnetic bridge and a connecting line of the circle centers of the sections of the rotors is alpha, an included angle formed by two end points of the first permanent magnets which are distributed in a spoke shape and close to one side of the first magnetic bridge and the connecting line of the circle centers of the sections of the rotors is beta, alpha and beta meet the following limiting conditions, alpha is less than beta, and two edges of the included angle alpha are positioned in the included angle beta; the first permanent magnet that is spoke form distribution is along rotor circumference evenly distributed, and the one end of every magnet is close to rotor core external diameter, and the other end is close to the pivot, and the parallel circumference tangential of magnetization direction, and north-south utmost point alternate along the circumference, and the second permanent magnet that is ring form distribution is close to the rotor pivot, along circumferencial direction evenly distributed, and the direction of magnetization is along the direction of radius, and north-south utmost point alternate along the circumference.
2. A spoke type permanent magnet synchronous motor rotor structure according to claim 1, wherein the rotor core is of a multi-pole design.
3. A spoke type permanent magnet synchronous motor rotor structure according to claim 1, wherein the rotor core is composed of laminated sheets of magnetic material.
4. A spoke type pm synchronous motor rotor structure according to claim 1, wherein said rotor core cross section is continuous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658558.4A CN112383159B (en) | 2020-07-09 | 2020-07-09 | Spoke type permanent magnet synchronous motor rotor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010658558.4A CN112383159B (en) | 2020-07-09 | 2020-07-09 | Spoke type permanent magnet synchronous motor rotor structure |
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| Publication Number | Publication Date |
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| CN112383159A CN112383159A (en) | 2021-02-19 |
| CN112383159B true CN112383159B (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010658558.4A Active CN112383159B (en) | 2020-07-09 | 2020-07-09 | Spoke type permanent magnet synchronous motor rotor structure |
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| Country | Link |
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| CN (1) | CN112383159B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023241475A1 (en) * | 2022-06-14 | 2023-12-21 | 美的威灵电机技术（上海）有限公司 | Rotor assembly and electric motor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000333389A (en) * | 1999-05-18 | 2000-11-30 | Fujitsu General Ltd | Permanent magnet motor |
| JP2009112181A (en) * | 2007-11-01 | 2009-05-21 | Nissan Motor Co Ltd | Rotator of permanent magnet type motor |
| JP2010088169A (en) * | 2008-09-30 | 2010-04-15 | Fujitsu General Ltd | Electric motor |
| CN102570663A (en) * | 2012-01-09 | 2012-07-11 | 美的威灵电机技术（上海）有限公司 | Hybrid rotor of rotary motor |
| CN102593983A (en) * | 2006-08-11 | 2012-07-18 | 株式会社东芝 | Rotating electrical machine |
| CN102856994A (en) * | 2011-06-30 | 2013-01-02 | 德昌电机(深圳)有限公司 | Permanent magnetic motor rotor |
| CN104685763A (en) * | 2012-09-29 | 2015-06-03 | 艾默生电气公司 | Rotors with segmented magnet configurations and related dynamoelectric machines and compressors |
| WO2015186280A1 (en) * | 2014-06-02 | 2015-12-10 | パナソニックＩｐマネジメント株式会社 | Permanent magnet-embedded electric motor |
| CN108574386A (en) * | 2018-04-11 | 2018-09-25 | 东南大学 | A kind of novel magneticfocusing disc type electric machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485762B (en) * | 2014-11-18 | 2018-01-19 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of permanent-magnetic synchronous motor rotor and permagnetic synchronous motor |
-
2020
- 2020-07-09 CN CN202010658558.4A patent/CN112383159B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000333389A (en) * | 1999-05-18 | 2000-11-30 | Fujitsu General Ltd | Permanent magnet motor |
| CN102593983A (en) * | 2006-08-11 | 2012-07-18 | 株式会社东芝 | Rotating electrical machine |
| JP2009112181A (en) * | 2007-11-01 | 2009-05-21 | Nissan Motor Co Ltd | Rotator of permanent magnet type motor |
| JP2010088169A (en) * | 2008-09-30 | 2010-04-15 | Fujitsu General Ltd | Electric motor |
| CN102856994A (en) * | 2011-06-30 | 2013-01-02 | 德昌电机(深圳)有限公司 | Permanent magnetic motor rotor |
| CN102570663A (en) * | 2012-01-09 | 2012-07-11 | 美的威灵电机技术（上海）有限公司 | Hybrid rotor of rotary motor |
| CN104685763A (en) * | 2012-09-29 | 2015-06-03 | 艾默生电气公司 | Rotors with segmented magnet configurations and related dynamoelectric machines and compressors |
| WO2015186280A1 (en) * | 2014-06-02 | 2015-12-10 | パナソニックＩｐマネジメント株式会社 | Permanent magnet-embedded electric motor |
| CN108574386A (en) * | 2018-04-11 | 2018-09-25 | 东南大学 | A kind of novel magneticfocusing disc type electric machine |
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| CN112383159A (en) | 2021-02-19 |
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