CN108808910B - Built-in hybrid permanent magnet motor - Google Patents
Built-in hybrid permanent magnet motor Download PDFInfo
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- CN108808910B CN108808910B CN201810562147.8A CN201810562147A CN108808910B CN 108808910 B CN108808910 B CN 108808910B CN 201810562147 A CN201810562147 A CN 201810562147A CN 108808910 B CN108808910 B CN 108808910B
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- permanent magnet
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- groove
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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
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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 built-in hybrid permanent magnet motor, wherein a V-shaped groove (2) is arranged along the circumferential direction of a rotor (1), and each side of the V-shaped groove is divided into an upper rectangular structure and a lower rectangular structure; the two rectangular structures are divided into a large rectangular structure (8) and a small rectangular structure (7), and permanent magnets made of ferrite and neodymium iron boron are respectively arranged in the grooves; the bottom of the V-shaped groove is provided with a Z-shaped reinforcing rib (5); a linear groove (3) is formed between the V-shaped groove and the outer edge of the rotor, and a neodymium iron boron permanent magnet (4) is placed in the linear groove; the permanent magnets are all magnetized in a vertical magnetizing mode; the V-shaped groove and the straight-line-shaped groove form a group of groove structures; a sickle-shaped magnetic isolation bridge (6) is arranged between the two groups of groove structures. According to the built-in hybrid permanent magnet motor provided by the invention, the permanent magnet structures made of different materials are asymmetrically arranged, so that the utilization rate, the output torque and the efficiency of the permanent magnet of the motor are improved, and the torque pulsation is reduced.
Description
Technical Field
The invention belongs to the technical field of motors, and relates to a built-in hybrid permanent magnet motor.
Background
At present, the problem of efficient utilization of energy is very much concerned all over the world, and how to realize the efficient utilization of energy becomes a subject of world development; the problem that the energy utilization rate of the industrial motor is relatively low still exists at present, and obvious energy high-efficiency utilization can be realized by improving the efficiency of the industrial motor. The built-in permanent magnet motor adopts permanent magnet excitation, and has no rotor resistance loss during stable operation, so that the total loss can be effectively reduced, and the built-in permanent magnet motor has great efficiency, space and advantages. Aiming at the characteristics of the built-in hybrid permanent magnet motor, the electromagnetic performance such as the efficiency of the built-in hybrid permanent magnet motor can be improved through the optimal design of the topological structure of the stator and the rotor of the motor.
The working principle of the built-in permanent magnet motor is that a rotating magnetic field generated by the electric excitation of the stator interacts with a magnetic field generated by a permanent magnet built in a rotor, so that the rotor rotates; because the permanent magnet is embedded into the rotor, the surface of the rotor is relatively smooth and has a salient pole effect, but the problem of relatively large magnetic flux leakage coefficient is brought, so that the air gap magnetic flux is relatively small, and the utilization rate of the permanent magnet is reduced. By using mixed excitation of various permanent magnet materials and reasonably arranging the magnetic isolation bridge on the rotor, the torque utilization rate of the motor can be improved, and the torque pulsation is reduced; however, the unreasonable arrangement of the permanent magnets and the design of the magnetic isolation bridge cannot achieve the effect of improving the performance of the motor, and can bring about greater energy loss; therefore, reasonable arrangement of the permanent magnets and the shape design of the magnetic isolation bridge have positive significance for improving the torque output and the efficiency of the motor.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the built-in hybrid permanent magnet motor which can improve the efficiency and the torque utilization rate of the built-in hybrid permanent magnet motor and reduce the output torque fluctuation.
In order to achieve the purpose, the invention adopts the technical scheme that: the built-in hybrid permanent magnet motor comprises a rotor and a stator, wherein the rotor (1) is positioned in the stator (9); a V-shaped groove (2) is formed in the rotor along the circumferential direction; a straight-line-shaped groove (3) is formed between the V-shaped groove (2) and the outer edge of the rotor; the V-shaped groove and the straight-line-shaped groove form a group of groove structures, and the polarities of the permanent magnets in the group of grooves are the same; a sickle-shaped magnetic isolation bridge (6) is arranged between the two groups of groove structures.
Further: each edge of the V-shaped groove (2) is divided into an upper part and a lower part; the upper part and the lower part are rectangular structures with different widths and lengths, the two rectangular structures are divided into a large rectangular structure (8) and a small rectangular structure (7), and the center lines of the large rectangular structure and the small rectangular structure are not coaxial; the ferrite permanent magnets are placed in the two large rectangular structures, the neodymium iron boron permanent magnets are placed in the two small rectangular structures, the large rectangular structure on the left side of the V-shaped groove is arranged on the upper portion, the small rectangular structure is arranged on the lower portion, the small rectangular structure on the right side of the V-shaped groove is arranged on the upper portion, and the large rectangular structure is arranged on the lower portion; the bottom of the V-shaped groove (2) is provided with a Z-shaped reinforcing rib (5).
Preferably: and a neodymium iron boron permanent magnet (4) is arranged in each straight-shaped groove (3).
Preferably: and a sickle-shaped magnetic isolation bridge (6) is arranged between groove structures formed by the two groups of V-shaped grooves (2) and the straight-shaped grooves (3), and the permanent magnets are all magnetized in a vertical mode.
Preferably: the width ratio of the large rectangular structure (8) to the small rectangular structure (7) in the V-shaped groove (2) is 1: 2.35-2.89, the length ratio is: 1: 4.77-5.3.
Preferably: the length ratio of the linear groove (3) to the neodymium iron boron permanent magnet (4) is as follows: 1: 1.25-1.4, width ratio: 1: 1.15-2.35.
Preferably: the opening angle alpha range of the end part of the sickle-shaped magnetism isolating bridge (6) is as follows: 46-73 deg., and tail length range: 3.6-5.1 mm.
Compared with the prior art, the stator and rotor structure of the built-in permanent magnet brushless direct current motor provided by the invention has the following beneficial effects:
1. due to the arrangement mode of the V-shaped permanent magnets, the magnetic flux path of the rotor of the motor is improved, the utilization rate of the permanent magnets of the motor is improved, and key electromagnetic performance parameters such as no-load air gap flux density, no-load back electromotive force and the like are improved, so that the overall performance of the motor is improved.
The V-shaped arrangement and the linear permanent magnet arrangement form a parallel permanent magnet magnetic circuit, the V-shaped arrangement and the linear permanent magnet arrangement form a series permanent magnet magnetic circuit, and two magnetic flux paths are utilized together, so that the motor has the advantages of large reluctance torque, small magnetic flux leakage and difficult demagnetization of the permanent magnet of the series magnetic circuit, and also has the advantages of large air gap flux density, small torque pulsation and the like of the parallel magnetic circuit, and the electromagnetic performance of the motor is improved in various aspects.
3. The use of the linear neodymium iron boron permanent magnet can effectively improve the capacity of the exchange of the electromagnetic performance of the motor, and improves the demagnetization resistance of the permanent magnets on two sides of the linear neodymium iron boron permanent magnet.
4. The sickle-shaped magnetic isolation bridge structure is adopted, the utilization rate of the permanent magnet is improved, the iron loss and the eddy current loss are reduced, and the operation efficiency of the motor is further improved.
In conclusion, the invention can improve the torque utilization rate of the built-in hybrid permanent magnet motor, reduce magnetic leakage, improve the demagnetization resistance, and has the advantages of high permanent magnet utilization rate, small torque ripple, low loss, high efficiency and the like.
Drawings
Fig. 1 is a block diagram of an 8-pole rotor of a preferred interior hybrid permanent magnet machine.
Fig. 2 is a view showing the structure of the V-shaped groove and the linear groove.
FIG. 3 is a view of the structure of a sickle-shaped magnetic bridge.
Fig. 4 is a schematic view of the magnetization direction of the permanent magnet, and the direction of the arrow in the figure is the magnetization direction.
Fig. 5 is a schematic structural diagram of the preferred embodiment.
Wherein: the rotor is 1, the V-shaped groove is 2, the straight-line-shaped groove is 3, the neodymium iron boron permanent magnet is 4, the Z-shaped reinforcing rib is 5, the magnetic isolation bridge is 6, the small rectangular structure is 7, the large rectangular structure is 8, the stator is 9, and the angle of an opening at the end part of the sickle-shaped magnetic isolation bridge is alpha.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The built-in hybrid permanent magnet motor comprises a rotor and a stator, wherein the rotor (1) is positioned in the stator (9); a V-shaped groove (2) is formed in the rotor along the circumferential direction; a straight-line-shaped groove (3) is formed between the V-shaped groove (2) and the outer edge of the rotor; the V-shaped groove and the straight-line-shaped groove form a group of groove structures, and the polarities of the permanent magnets in the group of grooves are the same; a sickle-shaped magnetic isolation bridge (6) is arranged between the two groups of groove structures.
Each side of the V-shaped groove is divided into an upper part and a lower part; the upper part and the lower part are rectangular structures with different widths and lengths, the two rectangular structures are divided into a large rectangular structure (8) and a small rectangular structure (7), and the center lines of the large rectangular structure and the small rectangular structure are not coaxial; permanent magnets made of ferrite and neodymium iron boron are arranged in the large rectangular structure and the small rectangular structure respectively, wherein the ferrite permanent magnet material on the left side is arranged on the upper portion, the neodymium iron boron permanent magnet material is arranged on the lower portion, the neodymium iron boron permanent magnet material on the right side is arranged on the upper portion, and the ferrite permanent magnet material is arranged on the lower portion; the bottom of the V-shaped groove (2) is provided with a Z-shaped reinforcing rib (5).
And a neodymium iron boron permanent magnet (4) is arranged in each straight-shaped groove (3).
And a sickle-shaped magnetic isolation bridge (6) is arranged between groove structures formed by the two groups of V-shaped grooves (2) and the straight-shaped grooves (3), and the permanent magnets are all magnetized in a vertical mode.
The width ratio of the large rectangular structure (8) to the small rectangular structure (7) in the V-shaped groove (2) is 1: 2.35-2.89, the length ratio is: 1: 4.77-5.3.
The length ratio of the linear groove (3) to the neodymium iron boron permanent magnet (4) is as follows: 1: 1.25-1.4, width ratio: 1: 1.15-2.35.
The opening angle alpha range of the end part of the sickle-shaped magnetism isolating bridge (6) is as follows: 46-73 deg., and tail length range: 3.6-5.1 mm.
The principle of the invention is as follows:
by utilizing the principles of 'improvement of a hybrid excitation structure on the performance of a motor' and 'minimization of magnetic leakage', a plurality of V-shaped grooves for embedding hybrid permanent magnets are arranged on a rotor, the grooves are arranged on the rotor taking the axis of a rotating shaft as a circular point, and each side of each V-shaped groove is divided into an upper part and a lower part; the upper part and the lower part are rectangular structures with different widths and lengths, the two rectangular structures are divided into a large rectangular structure (8) and a small rectangular structure (7), and the center lines of the large rectangular structure and the small rectangular structure are not coaxial; permanent magnets made of ferrite and neodymium iron boron are arranged in the large rectangular structure and the small rectangular structure respectively, wherein the ferrite permanent magnet material on the left side is arranged on the upper portion, the neodymium iron boron permanent magnet material is arranged on the lower portion, the neodymium iron boron permanent magnet material on the right side is arranged on the upper portion, and the ferrite permanent magnet material is arranged on the lower portion; the bottom of the V-shaped groove is provided with a Z-shaped reinforcing rib; a linear groove is arranged between the V-shaped groove and the outer edge of the rotor, and a neodymium iron boron permanent magnet is placed in the linear groove; the permanent magnets adopt a vertical magnetizing mode; the V-shaped groove and the straight-line-shaped groove form a group of groove structures, and the polarities of the permanent magnets in the group of grooves are the same; a sickle-shaped magnetic isolation bridge is arranged between the two groups of groove structures; through the groove structure and the sickle-shaped magnetic isolation bridge with the irregular shape, the utilization rate of the permanent magnet is improved, and the torque utilization rate and the motor efficiency of the motor are improved.
As shown in fig. 1, in the rotor structure of the motor, V-shaped grooves are formed along the circumferential direction of the rotor, and Z-shaped reinforcing ribs are arranged at the bottoms of the V-shaped grooves, so that the purpose of enhancing the mechanical strength of the rotor is achieved.
As shown in fig. 2, each side of the V-shaped groove is divided into an upper part and a lower part; the upper part and the lower part are rectangular structures with different widths and lengths, the two rectangular structures are divided into a large rectangular structure and a small rectangular structure, and the central lines of the large rectangular structure and the small rectangular structure are not coaxial; permanent magnets made of ferrite and neodymium iron boron are arranged in the large rectangular structure and the small rectangular structure respectively, wherein the ferrite permanent magnet material on the left side is arranged on the upper portion, the neodymium iron boron permanent magnet material is arranged on the lower portion, the neodymium iron boron permanent magnet material on the right side is arranged on the upper portion, and the ferrite permanent magnet material is arranged on the lower portion; be equipped with a style of calligraphy groove in the middle of V type groove and the rotor outward flange, placed the neodymium iron boron permanent magnet in a style of calligraphy groove, big rectangle structure and little rectangle structure width ratio in the V type groove are 1: 2.35-2.89, the length ratio is: 1: 4.77-5.3, the length ratio of the linear groove to the neodymium iron boron permanent magnet is as follows: 1: 1.25-1.4, width ratio: 1: 1.15-2.35.
As shown in fig. 3, a sickle-shaped magnetic isolation bridge is arranged between the two sets of groove structures, and the opening angle α range of the end part of the sickle-shaped magnetic isolation bridge is as follows: 46-73 deg., and tail length range: 3.6-5.1 mm. The utilization of sickle-shaped magnetic isolation bridge can reduce the magnetic leakage of the permanent magnet, greatly improve the torque utilization rate of the motor, reduce the loss and improve the efficiency of the motor, however, the difference of the opening angle of the end part of the sickle-shaped magnetic isolation bridge and the length of the tail part of the sickle-shaped magnetic isolation bridge can bring different influences to the performance of the motor, and the normal operation of the motor can be influenced even if the size is unreasonable.
As shown in fig. 4, the permanent magnet materials in the same slot structure have the same polarity, and the permanent magnet materials in different slot structures have opposite polarities.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The built-in hybrid permanent magnet motor is characterized by comprising a rotor and a stator, wherein the rotor (1) is positioned in the stator (9); a V-shaped groove (2) is formed in the rotor along the circumferential direction; a straight-line-shaped groove (3) is formed between the V-shaped groove (2) and the outer edge of the rotor; the V-shaped groove and the straight-line-shaped groove form a group of groove structures, and the polarities of the permanent magnets in the group of grooves are the same;
each edge of the V-shaped groove (2) is divided into an upper part and a lower part; the upper part and the lower part are rectangular structures with different widths and lengths, the two rectangular structures are divided into a large rectangular structure (8) and a small rectangular structure (7), and the center lines of the large rectangular structure and the small rectangular structure are not coaxial; the ferrite permanent magnets are placed in the two large rectangular structures, the neodymium iron boron permanent magnets are placed in the two small rectangular structures, the large rectangular structure on the left side of the V-shaped groove is arranged on the upper portion, the small rectangular structure is arranged on the lower portion, the small rectangular structure on the right side of the V-shaped groove is arranged on the upper portion, and the large rectangular structure is arranged on the lower portion; the bottom of the V-shaped groove (2) is provided with a reinforcing rib (5);
each linear groove (3) is internally provided with a neodymium iron boron permanent magnet (4);
a sickle-shaped magnetic isolation bridge (6) is arranged between groove structures formed by the two groups of V-shaped grooves (2) and the straight-shaped grooves (3), and the permanent magnets are all magnetized in a vertical mode.
2. The interior hybrid permanent magnet machine according to claim 1, wherein: the width ratio of the small rectangular structure (7) to the large rectangular structure (8) in the V-shaped groove (2) is 1: 2.35-2.89, the length ratio is: 1: 4.77-5.3.
3. The interior hybrid permanent magnet machine according to claim 1, wherein: the length ratio of the neodymium iron boron permanent magnet (4) placed in the straight-shaped groove (3) to the straight-shaped groove (3) is as follows: 1: 1.25-1.4, width ratio: 1: 1.15-2.35.
4. The interior hybrid permanent magnet machine according to claim 1, wherein: the opening angle alpha range of the end part of the sickle-shaped magnetism isolating bridge (6) is as follows: 46-73 deg., and tail length range: 3.6-5.1 mm.
5. The interior hybrid permanent magnet machine according to claim 1, wherein: the reinforcing ribs (5) are Z-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810562147.8A CN108808910B (en) | 2018-06-04 | 2018-06-04 | Built-in hybrid permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810562147.8A CN108808910B (en) | 2018-06-04 | 2018-06-04 | Built-in hybrid permanent magnet motor |
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| CN108808910A CN108808910A (en) | 2018-11-13 |
| CN108808910B true CN108808910B (en) | 2020-11-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617279B (en) * | 2019-01-18 | 2020-11-03 | 江苏大学 | Modular built-in hybrid permanent magnet motor rotor structure |
| CN109818474B (en) * | 2019-03-11 | 2024-03-22 | 浙江龙芯电驱动科技有限公司 | High-reluctance torque concentrated winding brushless motor |
| CN109936230A (en) * | 2019-03-28 | 2019-06-25 | 东南大学 | A kind of series circuit type two-layer hybrid permanent magnetism memory electrical machine |
| CN110277851A (en) * | 2019-07-23 | 2019-09-24 | 中达电机股份有限公司 | Mixed magneto rotor and its mixed magneto |
| US20220294289A1 (en) * | 2019-09-30 | 2022-09-15 | Daikin Industries, Ltd. | Rotor and motor |
| CN112701823B (en) * | 2020-12-02 | 2022-03-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor core, motor and air conditioning unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000092763A (en) * | 1998-09-18 | 2000-03-31 | Toshiba Corp | Permanent magnet type motor |
| JP2009268204A (en) * | 2008-04-23 | 2009-11-12 | Toyota Motor Corp | Rotor for ipm motor, and ipm motor |
| CN104242509B (en) * | 2013-06-05 | 2017-08-04 | 上海欧普斯达光纤通信设备有限公司 | A kind of permanent magnetism is combined excitatory synchronous electric motor rotor |
| CN104104168B (en) * | 2014-07-16 | 2016-08-24 | 东南大学 | A kind of stator rotor structure of built-in permanent-magnet brushless direct current generator |
| CN104836355B (en) * | 2015-05-14 | 2018-10-19 | 广东美芝制冷设备有限公司 | The rotor of electric rotating machine, permanent magnet motor, compressor, air-conditioning system |
| CN207098792U (en) * | 2017-06-27 | 2018-03-13 | 上海电驱动股份有限公司 | A kind of rotor punching of permagnetic synchronous motor |
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