CN114301203A - High torque density magnetic circuit series type rotor structure - Google Patents
High torque density magnetic circuit series type rotor structure Download PDFInfo
- Publication number
- CN114301203A CN114301203A CN202111640161.3A CN202111640161A CN114301203A CN 114301203 A CN114301203 A CN 114301203A CN 202111640161 A CN202111640161 A CN 202111640161A CN 114301203 A CN114301203 A CN 114301203A
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- permanent magnets
- magnetic
- rotor
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention relates to the field of permanent magnet motors, in particular to a high-torque-density magnetic circuit series rotor structure which comprises a central rotating shaft, a rotor core, 2P radial magnetized permanent magnets and 2P tangential magnetized permanent magnets, wherein the central rotating shaft is made of non-magnetic-conductive materials and is fixedly connected with the rotor core through a key slot structure, the two permanent magnets are respectively arranged in a surface embedded mode and a built-in mode, the offset angle of the surface embedded permanent magnet is alpha, and air magnetic barriers with different widths are arranged on two sides of the surface embedded permanent magnet. The invention utilizes radial and tangential permanent magnets to form a series magnetic circuit, greatly reduces the magnetic leakage of a rotor part by the design of surface embedded permanent magnet offset, unequal-width magnetic barriers and a non-magnetic-conduction central rotating shaft, and fully utilizes the permanent magnet torque and the reluctance torque to ensure that the motor has higher torque density.
Description
Technical Field
The invention relates to the field of permanent magnet motors, in particular to a high-torque-density magnetic circuit series rotor structure.
Background
The rotor structure of the radial permanent magnet synchronous motor can be divided into a surface-mounted type, a surface-embedded type and a built-in type. The built-in rotor structure has different quadrature axis and direct axis inductances, so that the total torque contains a reluctance torque component, and meanwhile, the SPOKE rotor structure also has a remarkable magnetism gathering effect and can provide higher permanent magnet torque. The built-in rotor structure is beneficial to improving the overload capacity and power density of the motor, is easy to realize weak magnetic speed regulation and expands the constant power operation range, but the structure has large torque pulsation and larger magnetic leakage, particularly in a low-power motor, the width of a magnetic bridge is designed to be as small as possible in order to reduce the magnetic leakage of the built-in permanent magnet motor, and the problem of the magnetic leakage of the built-in low-power motor needs reasonable structural design because the width of the magnetic bridge cannot be processed to the designed minimum value due to the constraint of a manufacturing process.
In the traditional built-in permanent magnet synchronous motor, the rotor structure is symmetrical, the phase difference of current angles when the permanent magnet torque and the reluctance torque components reach the maximum value is about 45 degrees, and the maximum output torque cannot be obtained. The permanent magnet motor adopting the asymmetric rotor structure has the advantages that the permanent magnet straight shaft and the magnetic resistance straight shaft are close to each other, so that the current angle of the permanent magnet torque and the magnetic resistance torque which can obtain the maximum value is close to each other, and the total output torque is improved.
Disclosure of Invention
To solve the above-mentioned drawbacks of the background art, an object of the present invention is to provide a high torque density magnetic circuit series type rotor structure.
The purpose of the invention can be realized by the following technical scheme:
a high-torque-density magnetic circuit series type rotor structure comprises a central rotating shaft and a rotor core arranged outside the central rotating shaft, wherein 2P blocks of radially magnetized permanent magnets distributed in an array and 2P blocks of tangentially magnetized permanent magnets distributed in an array are arranged on the outer side of the rotor core, and the mounting modes of the first permanent magnets and the second permanent magnets are respectively surface-embedded and built-in;
the offset angle of the first permanent magnet is alpha, air magnetic barriers with different widths are arranged on two sides of the first permanent magnet, and the corresponding angles of the air magnetic barriers on the two sides are beta respectively1And beta2The corresponding angle of the width of the second permanent magnet is theta and satisfies the following relation: alpha + beta1+β2+θ＜180°/P；
The inner and outer radii of the rotor core are riAnd roThe thickness of the first permanent magnet is hm1The height of the permanent magnet II is hm2The second permanent magnet is arranged at the side close to the air gap and has the width hbAnd satisfies the following relationship: h ism1＝hb，hm2+hb＝ro-ri。
Furthermore, the magnetizing directions of the adjacent first permanent magnets are opposite, the magnetizing directions of the adjacent second permanent magnets are also opposite, each pole consists of three permanent magnets, and the adjacent magnetic poles share one second permanent magnet;
if the magnetizing direction of the first permanent magnet points to the circle center, the magnetizing directions of the second permanent magnets are opposite, and if the magnetizing direction of the first permanent magnet points to the outer side from the circle center, the magnetizing directions of the second permanent magnets are opposite.
Furthermore, the rotor core is formed by laminating rotor punching sheets, the rotor punching sheets are obtained by punching silicon steel sheets, the first permanent magnet and the second permanent magnet are made of high-performance rare earth permanent magnet materials or the first permanent magnet is made of high-performance rare earth permanent magnet materials, and the second permanent magnet is made of low-price ferrite materials.
Furthermore, the central rotating shaft is made of a non-magnetic material, a T-shaped protrusion is arranged on the outer edge of the central rotating shaft, a T-shaped groove is formed in the inner edge of the rotor core, and the T-shaped protrusion and the T-shaped groove are matched to realize fixed connection.
The invention has the beneficial effects that:
1. the invention greatly reduces the magnetic leakage of the rotor part by the design of the placement positions of two permanent magnets;
2. according to the invention, through the design of surface embedded permanent magnet offset and unequal-width air magnetic barriers, the current angle of the maximum value of the permanent magnet torque and the reluctance torque is close, and the total output torque is improved;
3. the key groove structure of the non-magnetic-conduction central rotating shaft and the rotor core reduces magnetic leakage and ensures mechanical stability;
4. the permanent magnet can be made of ferrite and other rare earth-less permanent magnet materials, so that the cost of the motor is reduced.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;
FIG. 1 is a schematic plan view of a rotor structure of the present invention;
FIG. 2 is a schematic plan view of a portion of a rotor structure of the present invention;
fig. 3 is a schematic output torque diagram of the magnetic circuit series type rotor structure motor of the present invention and the conventional SPOKE type rotor structure motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A high-torque-density magnetic circuit series type rotor structure is shown in figure 1 and comprises a central rotating shaft 1 and a rotor core 2 arranged outside the central rotating shaft 1, wherein 2P radial magnetizing permanent magnets 3-1 distributed in an array mode and 2P tangential magnetizing permanent magnets 3-2 distributed in an array mode are arranged on the outer side of the rotor core 2, and the permanent magnets 3-1 and the permanent magnets 3-2 are installed in a surface embedded mode and a built-in mode respectively.
As shown in fig. 2, the offset angle of the first permanent magnet 3-1 is α, the two sides of the first permanent magnet 3-1 are provided with air magnetic barriers 4 with different widths, and the corresponding angles of the air magnetic barriers 4 on the two sides are β respectively1And beta2The corresponding angle of the width of the second permanent magnet 3-2 is theta, and the following relation is satisfied: alpha + beta1+β2+θ＜180°/P。
The inner and outer radii of the rotor core 2 are riAnd roThe thickness of the permanent magnet I is 3-1 and hm1The height of the permanent magnet II is 3-2 hm2The width of the permanent magnet II 3-2 close to the air gap side is set to be hbAnd satisfies the following relationship: h ism1＝hb，hm2+hb＝ro-ri。
In the magnetic circuit series rotor structure, the magnetizing directions of adjacent first permanent magnets 3-1 are opposite, the magnetizing directions of adjacent second permanent magnets 3-2 are also opposite, each pole consists of three permanent magnets, and adjacent magnetic poles share one second permanent magnet 3-2; if the magnetizing direction of the first permanent magnet 3-1 points to the circle center, the magnetizing directions of the second permanent magnets 3-2 are opposite, and if the magnetizing direction of the first permanent magnet 3-1 points to the outer side from the circle center, the magnetizing directions of the second permanent magnets 3-2 are opposite.
The rotor core 2 is formed by laminating rotor punching sheets, the rotor punching sheets are obtained by punching silicon steel sheets, the two permanent magnets are uniformly made of high-performance rare earth permanent magnet materials, or the permanent magnet I3-1 is made of high-performance rare earth permanent magnet materials, and the permanent magnet II 3-2 is made of low-price ferrite materials.
The central rotating shaft 1 is made of a non-magnetic-conductive material, the outer edge of the central rotating shaft 1 is provided with a T-shaped bulge, the inner edge of the rotor core 2 is provided with a T-shaped groove, and the T-shaped bulge and the T-shaped groove are matched to realize fixed connection.
The invention utilizes radial and tangential permanent magnets to form a series magnetic circuit, greatly reduces the magnetic leakage of a rotor part by the design of surface embedded permanent magnet offset, unequal-width magnetic barriers and a non-magnetic-conduction central rotating shaft, and fully utilizes the permanent magnet torque and the reluctance torque to ensure that the motor has higher torque density.
Example (b):
as shown in figures 1 and 2, the rotor structure of the invention is applied to a three-phase synchronous motor, the number of the pole pairs of the rotor is five, the corresponding stator adopts a double-layer fractional-slot concentrated winding structure with twelve slot numbers, the magnetic pole of the rotor is composed of ten radially-magnetized permanent magnets one 3-1 and ten tangentially-magnetized permanent magnets two 3-2, the placing modes of the two permanent magnets are respectively surface embedded type and built-in type, and the permanent magnets are arranged in a permanent way of being embedded in the surface and being embedded in the insideThe body is made of neodymium iron boron, the offset angle of 3-1 of the first permanent magnet is 1.5 degrees, and the width of the air magnetic barriers 4 on the two sides corresponds to the angle beta1＝0.8°、β22.8 °, the width correspondence angle θ of the permanent magnet two 3-2 is 2.78 °, and the inner diameter r of the rotor core 2 is set to be larger than that of the permanent magnet two 3-2i5mm, outer diameter roThickness h of permanent magnet 1-3 mmm10.5mm, height h of permanent magnet two 3-2m24.6mm, and the width h of the magnetic bridge at the side of the permanent magnet two 3-2 close to the air gapb＝0.5mm。
The traditional SPOKE rotor structure motor is selected for comparison, the using amount of permanent magnet materials of the traditional SPOKE rotor structure motor is the same, rated current with the effective value of 1.1A is applied to the stator side, under the rated rotating speed, the output torque is shown in figure 3, the average value of the output torque of the magnetic circuit series type rotor structure and the traditional SPOKE rotor structure is 308mNM and 250mNM respectively, and the average torque is increased by 23.2%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (4)
1. A high torque density magnetic circuit series type rotor structure comprises a central rotating shaft (1) and a rotor core (2) arranged outside the central rotating shaft (1), and is characterized in that 2P radial magnetized permanent magnets (3-1) distributed in an array and 2P tangential magnetized permanent magnets (3-2) distributed in an array are arranged on the outer side of the rotor core (2), and the permanent magnets (3-1) and the permanent magnets (3-2) are installed in a surface embedded mode and a built-in mode respectively;
the offset angle of the first permanent magnet (3-1) is alpha, air magnetic barriers (4) with different widths are arranged on two sides of the first permanent magnet (3-1), and the corresponding angles of the air magnetic barriers (4) on the two sides are beta respectively1And beta2The corresponding angle of the width of the second permanent magnet (3-2) is theta, and the following relation is satisfied:α+β1+β2+θ＜180°/P；
the inner and outer radiuses of the rotor iron core (2) are respectively riAnd roThe thickness of the permanent magnet I (3-1) is hm1The height of the permanent magnet II (3-2) is hm2The permanent magnet II (3-2) is arranged at the side close to the air gap and has the width hbAnd satisfies the following relationship: h ism1＝hb，hm2+hb＝ro-ri。
2. A high torque density magnetic circuit series type rotor structure according to claim 1, wherein the magnetization directions of adjacent permanent magnets one (3-1) are opposite, the magnetization directions of adjacent permanent magnets two (3-2) are also opposite, and each pole is composed of three permanent magnets, and adjacent magnetic poles share one permanent magnet two (3-2);
if the magnetizing direction of the first permanent magnet (3-1) points to the circle center, the magnetizing directions of the second permanent magnets (3-2) are opposite, and if the magnetizing direction of the first permanent magnet (3-1) points to the outer side from the circle center, the magnetizing directions of the second permanent magnets (3-2) are opposite.
3. The rotor structure of claim 1, wherein the rotor core (2) is formed by laminating rotor sheets, the rotor sheets are obtained by stamping silicon steel sheets, the first permanent magnet (3-1) and the second permanent magnet (3-2) are made of high-performance rare earth permanent magnet materials or the first permanent magnet (3-1) is made of high-performance rare earth permanent magnet materials and the second permanent magnet (3-2) is made of low-cost ferrite materials.
4. A high torque density magnetic circuit series type rotor structure according to claim 1, wherein said central rotating shaft (1) is made of non-magnetic conductive material, the outer edge of the central rotating shaft (1) is provided with T-shaped protrusions, the inner edge of the rotor core (2) is provided with T-shaped grooves, and the T-shaped protrusions and the T-shaped grooves are matched to realize fixed connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111640161.3A CN114301203B (en) | 2021-12-29 | 2021-12-29 | High torque density magnetic circuit series type rotor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111640161.3A CN114301203B (en) | 2021-12-29 | 2021-12-29 | High torque density magnetic circuit series type rotor structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114301203A true CN114301203A (en) | 2022-04-08 |
| CN114301203B CN114301203B (en) | 2023-03-14 |
Family
ID=80972365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111640161.3A Active CN114301203B (en) | 2021-12-29 | 2021-12-29 | High torque density magnetic circuit series type rotor structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114301203B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104106198A (en) * | 2012-05-28 | 2014-10-15 | 株式会社日立产机系统 | Composite torque rotating electric machine |
| CN104201852A (en) * | 2014-09-11 | 2014-12-10 | 东南大学 | Winding-complementary permanent magnet rotor magnetic-flux switching motor |
| US20140375162A1 (en) * | 2013-06-20 | 2014-12-25 | Samsung Electronics Co., Ltd. | Rotor of electric motor and motor using the same |
| CN205377616U (en) * | 2016-01-14 | 2016-07-06 | 河南理工大学 | Novel permanent magnet motor rotor |
| CN108599418A (en) * | 2018-05-16 | 2018-09-28 | 华中科技大学 | A kind of rotor core and motor of magnetic circuit tandem type hybrid permanent magnet controllable flux motor |
| CN108667177A (en) * | 2018-06-15 | 2018-10-16 | 江苏大学 | A kind of high torque density asymmetrical rotor structure |
| CN108880038A (en) * | 2018-07-26 | 2018-11-23 | 南京航空航天大学 | Mix pole rotor and motor |
| CN110034622A (en) * | 2019-05-07 | 2019-07-19 | 南京航空航天大学 | High-intensitive concentrated magnetic p-m rotor and motor |
| US20200303979A1 (en) * | 2019-03-22 | 2020-09-24 | Feaam Gmbh | Rotor and electrical machine |
| CN212033851U (en) * | 2020-03-13 | 2020-11-27 | 安徽威灵汽车部件有限公司 | Rotor of motor, power assembly and vehicle |
-
2021
- 2021-12-29 CN CN202111640161.3A patent/CN114301203B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104106198A (en) * | 2012-05-28 | 2014-10-15 | 株式会社日立产机系统 | Composite torque rotating electric machine |
| US20140375162A1 (en) * | 2013-06-20 | 2014-12-25 | Samsung Electronics Co., Ltd. | Rotor of electric motor and motor using the same |
| CN104201852A (en) * | 2014-09-11 | 2014-12-10 | 东南大学 | Winding-complementary permanent magnet rotor magnetic-flux switching motor |
| CN205377616U (en) * | 2016-01-14 | 2016-07-06 | 河南理工大学 | Novel permanent magnet motor rotor |
| CN108599418A (en) * | 2018-05-16 | 2018-09-28 | 华中科技大学 | A kind of rotor core and motor of magnetic circuit tandem type hybrid permanent magnet controllable flux motor |
| CN108667177A (en) * | 2018-06-15 | 2018-10-16 | 江苏大学 | A kind of high torque density asymmetrical rotor structure |
| CN108880038A (en) * | 2018-07-26 | 2018-11-23 | 南京航空航天大学 | Mix pole rotor and motor |
| US20200303979A1 (en) * | 2019-03-22 | 2020-09-24 | Feaam Gmbh | Rotor and electrical machine |
| CN110034622A (en) * | 2019-05-07 | 2019-07-19 | 南京航空航天大学 | High-intensitive concentrated magnetic p-m rotor and motor |
| CN212033851U (en) * | 2020-03-13 | 2020-11-27 | 安徽威灵汽车部件有限公司 | Rotor of motor, power assembly and vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 邓紫荣 等: "一种非对称混合式永磁同步电机设计与分析", 《微电机》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114301203B (en) | 2023-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140167550A1 (en) | Motor rotor and motor having same | |
| CN112564346B (en) | High-torque-density axial magnetic field permanent magnet motor rotor structure and motor thereof | |
| CN108429375B (en) | Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric automobile | |
| CN109861413B (en) | Magnetic-gathering alternating-pole fault-tolerant permanent magnet vernier motor | |
| CN109245468B (en) | Birotor synchronous motor adopting permanent magnet auxiliary cage barrier rotor | |
| CN110601481A (en) | Birotor permanent magnet synchronous reluctance motor and configuration method | |
| CN113381540A (en) | Built-in permanent magnet rotor structure of axial magnetic motor | |
| CN110838779B (en) | Mixed excitation wound rotor and mixed excitation wound synchronous motor | |
| CN110635641B (en) | Axial magnetic field reverse salient pole permanent magnet synchronous motor | |
| CN108347113A (en) | A kind of permanent magnetic brushless of bilayer combination magnetic pole | |
| CN113131700B (en) | High power density in-wheel motor structure | |
| CN215817696U (en) | Permanent magnet auxiliary synchronous reluctance motor with six poles of rotor | |
| CN210350986U (en) | Birotor permanent magnet synchronous reluctance motor | |
| CN102403857A (en) | Stator surface-mounted doubly salient permanent-magnet motor with complementary winding magnetic paths | |
| CN109167502B (en) | Permanent magnet auxiliary cage barrier rotor synchronous motor | |
| CN107733112A (en) | A kind of ultrahigh speed permanent-magnetic synchronous motor rotor structure | |
| CN114301203B (en) | High torque density magnetic circuit series type rotor structure | |
| CN206650564U (en) | A kind of magnetic suspension flux switch motor | |
| CN206135581U (en) | Electric motor rotor and permanent -magnet machine | |
| CN208675081U (en) | A kind of magnetic pawl motor of high power density high efficiency high reliability | |
| CN109842257A (en) | Anti- salient pole type axial direction parallel type multiphase permanent magnet fault-tolerant electric machine | |
| CN114899962A (en) | Magnetic circuit series type rotor structure of rare earth-less permanent magnet material | |
| CN218633492U (en) | Motor rotor, motor and compressor | |
| CN219351384U (en) | Halbach permanent magnet synchronous motor rotor with few rare earth combined magnetic poles | |
| CN210867469U (en) | Mixed excitation wound rotor and mixed excitation wound synchronous motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |