CN106571704B - Permanent magnet motor rotor and permanent magnet motor - Google Patents
Permanent magnet motor rotor and permanent magnet motor Download PDFInfo
- Publication number
- CN106571704B CN106571704B CN201610882958.7A CN201610882958A CN106571704B CN 106571704 B CN106571704 B CN 106571704B CN 201610882958 A CN201610882958 A CN 201610882958A CN 106571704 B CN106571704 B CN 106571704B
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- China
- Prior art keywords
- permanent magnet
- rotor
- magnet motor
- motor
- magnetic
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- VQAPWLAUGBBGJI-UHFFFAOYSA-N [B].[Fe].[Rb] Chemical compound [B].[Fe].[Rb] VQAPWLAUGBBGJI-UHFFFAOYSA-N 0.000 claims description 3
- 229910000828 alnico Inorganic materials 0.000 claims description 3
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 3
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 abstract description 5
- 230000005347 demagnetization Effects 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to the technical field of permanent magnet motors, and particularly discloses a permanent magnet motor rotor. The permanent magnet motor rotor is characterized in that an outer permanent magnet is arranged on the outer side of a rotor core, an annular yoke part area positioned between the outer permanent magnet and an inner rotor hole on the rotor core is provided with a plurality of inner permanent magnets with opposite ends, the inner permanent magnets are positioned on a rotor magnetic path, and different magnetic poles of two adjacent inner permanent magnets on the same rotor magnetic path are opposite. The inner permanent magnet can supplement magnetism to the magnetic line loop and reduce leakage loss of magnetic line. After the permanent magnet motor is subjected to magnetic compensation, the torque output capacity of the motor can be improved, the overload capacity of the motor is improved, the temperature rise problem and the demagnetization problem of the motor with the original structure caused by insufficient overload capacity are solved, the load range of the permanent magnet motor is wider, and the operation is more reliable. The invention also discloses a permanent magnet motor with the permanent magnet motor rotor.
Description
Technical Field
The invention relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor rotor. The invention also relates to a permanent magnet motor with the permanent magnet motor rotor.
Background
The permanent magnet motor provides excitation by the permanent magnet, so that the motor structure is simpler, the processing and assembling cost is reduced, and the running reliability of the motor is improved; the motor has no excitation current and excitation loss, so that the efficiency and the power density of the motor are improved, and the motor is widely applied in various fields.
The leakage of magnetic force lines easily occurs in the working process of the permanent magnet motor, and the magnetic force lines are self-closed without interlinking the stator and the rotor due to the leakage, so that the loss of magnetic energy is caused. If the magnetic force is insufficient, the output torque of the permanent magnet motor is reduced, the rotating speed is slowed down, the output power is reduced, the overload capacity of the permanent magnet motor is insufficient, and the permanent magnet motor can also cause the temperature rise problem and the demagnetization problem due to the insufficient overload capacity.
Therefore, how to reduce the leakage loss of magnetic force lines of the permanent magnet motor and improve the torque output capability of the permanent magnet motor becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
A first object of the present invention is to provide a rotor of a permanent magnet motor to reduce leakage loss of magnetic lines of force of the permanent magnet motor and to improve torque output capability of the permanent magnet motor. A second object of the present invention is to provide a permanent magnet motor having the above permanent magnet motor rotor.
In order to achieve the first object, the present invention provides a permanent magnet motor rotor, including a rotor core, wherein an outer permanent magnet is disposed at an outer side of the rotor core, an annular yoke region between the outer permanent magnet and an inner hole of the rotor is disposed on the rotor core, a plurality of inner permanent magnets with opposite ends are disposed on the rotor magnetic path, and different magnetic poles of two adjacent inner permanent magnets on the same rotor magnetic path are opposite.
Preferably, the inner permanent magnet is enveloped in a unit magnetic circuit connecting the stator and the rotor.
Preferably, the magnetic force lines generated by the inner permanent magnet are consistent with the magnetic force lines generated by the outer permanent magnet.
Preferably, the rotor core is provided with a plurality of slots, and the inner permanent magnet is embedded in the slots.
Preferably, the slot hole is a through hole or a blind hole, and the through hole or the blind hole is round, square, bar-shaped, fan-shaped or irregular.
Preferably, the inner permanent magnet is a rubidium-iron-boron body, a ferrite body, an alnico body or a samarium-cobalt body.
The permanent magnet motor rotor provided by the invention is characterized in that a plurality of inner permanent magnets with opposite ends are arranged in an annular yoke part area between an outer permanent magnet and an inner rotor hole on a rotor core, different magnetic poles of two adjacent inner permanent magnets are opposite, and the inner permanent magnets are positioned on a magnetic line loop of a motor.
When magnetic force lines pass through the stator core and enter the yoke region of the rotor core, the inner permanent magnet arranged in the yoke region can promote magnetic potential in a magnetic force line loop where the inner permanent magnet is positioned, and meanwhile, the inner permanent magnet plays a role in attracting and restraining the magnetic force lines. Therefore, the inner permanent magnet can supplement magnetism to the magnetic line loop, and the leakage loss of magnetic lines is reduced. For the permanent magnet motor, after magnetic compensation, the torque output capacity of the motor can be improved, the overload capacity of the motor is improved, the temperature rise problem and the demagnetization problem of the motor with the original structure caused by insufficient overload capacity are improved, the load range width of the permanent magnet motor is wider, and the operation is more reliable.
In order to achieve the second object, the invention further provides a permanent magnet motor, which comprises the permanent magnet motor rotor. Because the permanent magnet motor rotor has the technical effects, the permanent magnet motor with the permanent magnet motor rotor also has corresponding technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a permanent magnet motor rotor according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the working principle of the permanent magnet motor rotor in fig. 1 when the rotor is at a rotation angle of 0 ° (starting position);
fig. 3 is a schematic diagram of the working principle of the permanent magnet motor rotor in fig. 1 when the rotor is at a rotation angle of 60 °.
Wherein, in fig. 1-3:
rotor core 1, outside permanent magnet 2, inboard permanent magnet 3, stator core 4.
Detailed Description
The present invention is described below based on examples, but the present invention is not limited to only these examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a permanent magnet motor rotor according to an embodiment of the invention.
As shown in fig. 1, the permanent magnet motor rotor provided by the invention comprises a rotor core 1, wherein an outer permanent magnet 2 is arranged on the outer side of the rotor core 1, and the rotor is characterized in that a plurality of inner permanent magnets 3 with opposite ends are arranged in an annular yoke area between the outer permanent magnet 2 and an inner hole of the rotor on the rotor core 1, the inner permanent magnets 3 are positioned on a rotor magnetic path, and different magnetic poles of two adjacent inner permanent magnets 3 on the same rotor magnetic path are opposite.
When the motor is operated, as shown in fig. 2 and 3, the main magnetic fields of the interlinked stator core 4 and the rotor core 1 also rotate towards the motor operation direction, the magnitude and the direction of the magnetic field at each position on the stator core 4 are changed along with time, but different from the stator core 4, the magnitude of the magnetic field at each position on the rotor core 1 is single and unchanged although the magnitude is different according to the operation state of the motor, so that the possibility is provided for the inner permanent magnet 3 with the fixed magnetic field inserted in the rotor yoke area to supplement the main magnetic field.
When the magnetic force lines pass through the stator core 4 and enter the yoke region of the rotor core 1, the inner permanent magnet 3 arranged in the yoke region can promote the magnetic potential in the magnetic force line loop where the inner permanent magnet 3 is positioned, and meanwhile, the inner permanent magnet 3 plays a role in attracting and restraining the magnetic force lines. Thus, the inner permanent magnet 3 can supplement magnetism to the magnetic line loop, and the leakage loss of the magnetic line is reduced. For the permanent magnet motor, after magnetic compensation, the torque output capacity of the motor can be improved, the overload capacity of the motor is improved, the temperature rise problem and the demagnetization problem of the motor with the original structure caused by insufficient overload capacity are improved, the load range width of the permanent magnet motor is wider, and the operation is more reliable.
In a preferred solution, the inner permanent magnet 3 is enveloped in a unit magnetic circuit connecting the stator and the rotor. The magnetic force lines emanate from the N pole of one outer permanent magnet 2 on the rotor core 1, pass through the stator core 4, and return to the above-described loop of one outer permanent magnet N pole through the S pole of the adjacent outer permanent magnet 2, called the unit loop. The inner permanent magnet 3 is enveloped in the unit loop, magnetic force lines in the unit loop can be drawn and absorbed by the inner permanent magnet 3 after passing through the inner permanent magnet 3, the magnetic force lines are tightly contained in the inner permanent magnet 3, and the inner permanent magnet 3 can restrict and compensate the magnetic force lines in the unit loop, so that the magnetic leakage loss is reduced.
In a more preferable scheme, the magnetic force lines generated by the inner permanent magnet 3 are consistent with the magnetic force lines generated by the outer permanent magnet 2. The inner permanent magnet 3 can better restrict and compensate the magnetic force lines in the unit circuit by the inner permanent magnet 3.
In a specific scheme, the rotor core 1 is provided with a plurality of slots, the slots are through holes, and the inner permanent magnet 3 is embedded into the through holes.
According to the scheme provided by the invention, the inner permanent magnet 3 is not limited to the mode of being arranged on the rotor core 1, the slotted hole on the rotor core 1 can also be a blind hole, and the inner permanent magnet 3 is embedded into the blind hole.
In a specific scheme, in the scheme provided by the invention, the inner permanent magnet 3 can be a permanent magnet such as a rubidium-iron-boron body, a ferrite body, an alnico body or a samarium-cobalt body, and the like, which are all within the protection scope of the invention.
The invention also provides a permanent magnet motor, which comprises the permanent magnet motor rotor. Because the permanent magnet motor rotor has the technical effects, the permanent magnet motor with the permanent magnet motor rotor also has corresponding technical effects.
In a specific scheme, the permanent magnet motor provided by the invention can be processed by the following method.
Firstly, punching, shearing and laminating the stator core and the rotor core of the permanent magnet motor by a high-speed punch to form slots in the yoke part area of the rotor core; the stator core is turned into stator manufacturing, the stator core is driven into a slot for insulation, and the two ends of the stator core are embedded into an insulation framework for fixation; then a machine winding machine winds coils on the stator magnetic poles successively, and the coils are contacted with a power supply terminal according to a circuit, bound and fixed, or the stator is manufactured after paint dipping; after the rotor core is cooled by low-temperature heat treatment, an outer permanent magnet and an inner permanent magnet are respectively inserted, and the magnetic pole sequence is noted; and the motor rotor is manufactured through locking and fixing the magnetic steel end plates. Similarly, the stator and the rotor are sleeved to form a non-contact permanent magnet motor, and after the stator side is connected to a power supply through a variable frequency controller, magnetic force lines of the cross-linked rotor are established in the stator through control of signals, and the rotor is pulled to rotate.
At this time, the magnetic force lines are moving relative to the stator and stationary relative to the rotor, and the inner permanent magnet of the yoke region of the rotor plays roles of magnetic force line restraint and magnetic compensation, so that the motor can show stronger overload capacity than a permanent magnet motor without a magnetic compensation structure: under the same overload condition, the permanent magnet motor without the magnetism supplementing structure has insufficient output to cause heating and temperature rise deterioration, and even when demagnetizing, the load range width of the permanent magnet motor with the magnetism supplementing structure is wider, and the operation is more reliable.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The permanent magnet motor rotor comprises a rotor core (1), wherein an outer permanent magnet (2) is arranged on the outer side of the rotor core (1), and the permanent magnet motor rotor is characterized in that a plurality of inner permanent magnets (3) which are opposite end to end are arranged in an annular yoke area between the outer permanent magnet (2) and an inner rotor hole on the rotor core (1), the inner permanent magnets (3) are positioned on a rotor magnetic circuit, and different magnetic poles of two adjacent inner permanent magnets (3) on the same rotor magnetic circuit are opposite; the inner permanent magnet (3) is enveloped in a unit magnetic circuit connecting the stator and the rotor; the magnetic force lines generated by the inner permanent magnet (3) are consistent with the magnetic force lines generated by the outer permanent magnet (2), and the inner permanent magnet (3) is not arranged between the circumferences of the outer permanent magnets.
2. Permanent magnet motor rotor according to claim 1, characterized in that the rotor core (1) is provided with a plurality of slots, in which slots the inner permanent magnets (3) are embedded.
3. The permanent magnet motor rotor according to claim 2, wherein the slots are through holes or blind holes, and the through holes or blind holes are circular, square, bar-shaped, fan-shaped or irregular.
4. The permanent magnet motor rotor according to claim 1, characterized in that the inner permanent magnet (3) is a rubidium-iron-boron body, a ferrite body, an alnico body or a samarium-cobalt body.
5. A permanent magnet motor comprising a permanent magnet motor rotor according to claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882958.7A CN106571704B (en) | 2016-10-09 | 2016-10-09 | Permanent magnet motor rotor and permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882958.7A CN106571704B (en) | 2016-10-09 | 2016-10-09 | Permanent magnet motor rotor and permanent magnet motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106571704A CN106571704A (en) | 2017-04-19 |
| CN106571704B true CN106571704B (en) | 2024-04-09 |
Family
ID=58532674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610882958.7A Active CN106571704B (en) | 2016-10-09 | 2016-10-09 | Permanent magnet motor rotor and permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106571704B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3916962A1 (en) * | 2020-05-27 | 2021-12-01 | Volvo Car Corporation | Permanent magnet motor with field weakening arrangement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002252939A (en) * | 2002-01-17 | 2002-09-06 | Toshiba Corp | Permanent magnet type reluctance dynamo electric machine |
| CN102570669A (en) * | 2010-12-06 | 2012-07-11 | 丰田自动车株式会社 | End plate, and rotor for rotary electric machine which employs the end plate |
| WO2014119022A1 (en) * | 2013-01-31 | 2014-08-07 | 多摩川精機株式会社 | Magnet arrangement structure for motor, rotor, and ipm motor |
| CN205453333U (en) * | 2015-12-29 | 2016-08-10 | 冶金自动化研究设计院 | Permanent magnet rotor structure of high power density and easy weak magnetism speed governing |
| CN206226149U (en) * | 2016-10-09 | 2017-06-06 | 武汉凌达压缩机有限公司 | A kind of permanent magnet machine rotor and magneto |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6062900B2 (en) * | 2014-09-15 | 2017-01-18 | トヨタ自動車株式会社 | Manufacturing method of rotor |
-
2016
- 2016-10-09 CN CN201610882958.7A patent/CN106571704B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002252939A (en) * | 2002-01-17 | 2002-09-06 | Toshiba Corp | Permanent magnet type reluctance dynamo electric machine |
| CN102570669A (en) * | 2010-12-06 | 2012-07-11 | 丰田自动车株式会社 | End plate, and rotor for rotary electric machine which employs the end plate |
| WO2014119022A1 (en) * | 2013-01-31 | 2014-08-07 | 多摩川精機株式会社 | Magnet arrangement structure for motor, rotor, and ipm motor |
| CN205453333U (en) * | 2015-12-29 | 2016-08-10 | 冶金自动化研究设计院 | Permanent magnet rotor structure of high power density and easy weak magnetism speed governing |
| CN206226149U (en) * | 2016-10-09 | 2017-06-06 | 武汉凌达压缩机有限公司 | A kind of permanent magnet machine rotor and magneto |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106571704A (en) | 2017-04-19 |
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