CN115276285A - High-torque-density motor rotor structure with efficient utilization of permanent magnets - Google Patents
High-torque-density motor rotor structure with efficient utilization of permanent magnets Download PDFInfo
- Publication number
- CN115276285A CN115276285A CN202211177652.3A CN202211177652A CN115276285A CN 115276285 A CN115276285 A CN 115276285A CN 202211177652 A CN202211177652 A CN 202211177652A CN 115276285 A CN115276285 A CN 115276285A
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- permanent magnet
- permanent magnets
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- main
- rotor core
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 9
- 230000005415 magnetization Effects 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 abstract description 16
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 9
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 238000004804 winding Methods 0.000 description 6
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 150000002910 rare earth metals Chemical class 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a high-torque density motor rotor structure with efficiently utilized permanent magnets, which comprises a rotor, wherein the rotor comprises a rotor iron core, magnetic conduction bridges, main permanent magnets and auxiliary permanent magnets, the number of the main permanent magnets is multiple, the main permanent magnets are assembled in the rotor iron core along the circumferential direction of the rotor iron core, two auxiliary permanent magnets are respectively arranged on two sides of the end part of each main permanent magnet along the axial direction of the rotor iron core, the two auxiliary permanent magnets are connected in a covering manner through the magnetic conduction bridges, the number of the auxiliary permanent magnets is four times that of the main permanent magnets, the main permanent magnets are magnetized along the radial direction of the rotor iron core, and the auxiliary permanent magnets are magnetized along the axial direction of the rotor iron core. The invention has the beneficial effects that: compared with the traditional built-in permanent magnet synchronous motor, the average value of the output torque is improved by more than 8% under the conditions that the total consumption of the permanent magnets is the same and the total volume of the motor is approximately unchanged, and the efficient utilization of the permanent magnets and the high torque density of the motor are realized.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a high-torque-density motor rotor structure with efficient utilization of permanent magnets.
Background
In the fields of automobiles, rail transit, aerospace, household appliances and the like, the permanent magnet synchronous motor is widely applied, a permanent magnet generates a magnetic field, the existence of structures such as an electric brush, a slip ring and the like is avoided, the performance of the permanent magnet synchronous motor is continuously improved along with the development of permanent magnet materials, and particularly, the permanent magnet synchronous motor has the advantages of high power density, high efficiency, high power factors and the like. China has abundant rare earth resources, but belongs to non-renewable resources, and has the problems of high cost, limited supply and the like, so that the method has great theoretical significance and practical value for fully exerting the advantages of abundant rare earth resources and protecting and efficiently utilizing the rare earth resources. For a permanent magnet motor, the improvement of the output power or torque generated by the unit permanent magnet amount is one of important factors for measuring the design level and the electromagnetic performance.
In order to meet the requirement of high output torque of the motor, the prior art increases the using amount of the permanent magnet and the volume of the motor on one hand, but increases the cost of the motor, reduces the torque density of the motor and possibly causes the waste of permanent magnet materials; on the other hand, the winding current is increased, but the copper loss is increased, and the requirement for the cooling form of the motor is higher. In order to meet the requirement of less rare earth or no rare earth of the motor, materials such as ferrite and the like or reluctance motors and the like are adopted in the prior art, but the motor performance is reduced, such as power density reduction, torque fluctuation increase and the like, and the practical value in engineering is not great.
Disclosure of Invention
The invention discloses a high-torque-density motor rotor structure with efficient utilization of permanent magnets, which can effectively solve the technical problems related to the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a high torque density electric motor rotor structure that permanent magnet high efficiency was utilized, includes the rotor, the rotor includes rotor core, leads magnetic bridge, main permanent magnet and vice permanent magnet, main permanent magnet quantity is the polylith, and the polylith main permanent magnet is followed rotor core's circumferencial direction matched stack in the rotor core, every main permanent magnet is followed the both sides of rotor core's axial direction's tip set up two respectively vice permanent magnet, two vice permanent magnet passes through the magnetic bridge covers and connects, main permanent magnet is followed rotor core's radial magnetization, vice permanent magnet is followed rotor core's axial magnetization.
As a preferable improvement of the present invention, the main permanent magnet and the auxiliary permanent magnet are made of the same permanent magnet material.
As a preferred improvement of the invention, the number of the secondary permanent magnets is four times that of the primary permanent magnets.
As a preferable improvement of the present invention, the magnetic conductive bridge has a square shape.
As a preferable improvement of the present invention, the main permanent magnet is embedded in the rotor core, and the total amount of the auxiliary permanent magnet is made up of the amount of the main permanent magnet reduced by the two side portions of the end portion near the upper and lower ends.
As a preferable improvement of the present invention, the main and auxiliary permanent magnets are provided at circumferential axial end portions of the rotor core, and the auxiliary permanent magnets are connected to be covered with the magnetic conductive bridge.
As a preferable improvement of the present invention, after both side portions of the end portion of the main permanent magnet near the upper and lower ends are cut, the same material as that of the rotor core is filled in portions of the rotor core near both sides of the end portion of the hollow groove for embedding the main permanent magnet.
As a preferable improvement of the present invention, the main permanent magnets are equally distributed along the circumferential direction of the rotor core, and the auxiliary permanent magnets are disposed on the end face of the rotor core and present a clamping shape to the main permanent magnets on both sides in the axial direction.
The invention has the following beneficial effects:
1) The auxiliary permanent magnet and the magnetic conductive bridge are assembled at the end parts of the two sides of the rotor, and the auxiliary permanent magnet and the magnetic conductive bridge just fill a cavity between the end part of the motor rotor and the bearing, so that the total volume of the motor is approximately unchanged, the output torque is increased, and high torque density is realized;
2) The auxiliary permanent magnets are assembled at the end parts of the two sides of the rotor and are adjacent to the main permanent magnet, the auxiliary permanent magnets are connected by the magnetic conduction bridges to form a magnetic circuit, the same armature winding current is given, and compared with the traditional built-in permanent magnet synchronous motor, the average output torque value of the motor is improved by over 8 percent under the condition of the same total permanent magnet consumption, so that the efficient utilization of the permanent magnets is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic perspective view of a high torque density rotor structure for an electric machine with efficient permanent magnet utilization according to the present invention;
FIG. 2 is an exploded view of the rotor structure of the high torque density motor of the present invention with efficient permanent magnet utilization;
FIG. 3 is a magnetic circuit diagram of a rotor structure of a high torque density electric machine with efficient use of permanent magnets according to the present invention;
FIG. 4 is a three-dimensional motor air gap flux density diagram of a conventional interior permanent magnet synchronous motor;
FIG. 5 is a three-dimensional motor air gap flux density diagram of a PMSM with efficient permanent magnet utilization according to the present invention;
fig. 6 is a motor output torque curve diagram of a permanent magnet synchronous motor with highly efficient utilization of permanent magnets of the present invention and a conventional built-in "one" type permanent magnet synchronous motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides a high torque density motor rotor structure with efficient permanent magnet utilization, which includes a rotor, wherein the rotor includes a rotor core 2, a magnetic bridge 3, a main permanent magnet 5 and an auxiliary permanent magnet 6. The number of the main permanent magnets 5 is multiple, the number of the auxiliary permanent magnets 6 is four times that of the main permanent magnets 5, and the main permanent magnets 5 and the auxiliary permanent magnets 6 are made of the same permanent magnet material.
The rotor comprises a rotor core 2, a plurality of main permanent magnets 5, a plurality of auxiliary permanent magnets 6 and a rotor core 2, wherein the main permanent magnets 5 are uniformly assembled in the rotor core 2 along the circumferential direction of the rotor core 2, the parts of the main permanent magnets 5, which are close to two sides of the end part, are cut off to form the total amount of the auxiliary permanent magnets 6, and the parts, which are close to two sides of the end part, of a hollow groove for embedding the main permanent magnets 5 are filled with materials the same as those of the rotor core 2.
Every main permanent magnet 5 follows the tip both sides at rotor core 2's axial direction's upper and lower both ends set up two respectively vice permanent magnet 6, two vice permanent magnet 6 passes through lead magnetic bridge 3 to cover the connection, vice permanent magnet 6 is right in the axial both sides 5 tip of main permanent magnet presents the centre gripping form, specifically, lead magnetic bridge 3 and be square.
Note that the rotor is surrounded by a stator including a stator core 4 and an armature winding 1 assembled to the stator core 4. Specifically, the stator core 4 is a hollow cylinder, and the armature winding 1 is assembled to the inner periphery of the stator core 4.
Further, as shown in fig. 3, the main permanent magnet 5, the rotor core 2 and the stator core 4 form a main permanent magnet magnetic circuit 7, the auxiliary permanent magnet 6, the magnetic bridge 3, the rotor core 2 and the stator core 4 form an auxiliary permanent magnet magnetic circuit 8, in addition, the main permanent magnet 5 is magnetized along the radial direction of the rotor core 2, and the auxiliary permanent magnet 6 is magnetized along the axial direction of the rotor core 2, so that the magnetic flux generated by the main permanent magnet 5 and the magnetic flux generated by the auxiliary permanent magnet 6 are the same in the radial direction, and the magnetic fluxes jointly form the main magnetic flux of the motor.
Compared with the square permanent magnet of the traditional built-in motor, the length of the magnetization direction of the main permanent magnet 5 is reduced (the whole is reduced or the part close to the two side ends of the rotor iron core 2 is reduced), the demagnetization resistance of the main permanent magnet is slightly reduced, but the auxiliary permanent magnets 6 on the two sides of the rotor end provide extra magnetic flux, so that the total magnetic flux provided by the main permanent magnet 5 and the auxiliary permanent magnets 6 to an external magnetic circuit of the motor becomes larger, and the motor has larger output torque under the same condition.
In addition, a traditional built-in permanent magnet synchronous motor and a permanent magnet synchronous motor model for efficient utilization of permanent magnets are established in finite element three-dimensional software, and air gap flux density under the no-load condition of the motor is calculated through a static field, as shown in fig. 4 and 5. As can be seen from fig. 4 and 5, the permanent magnet synchronous motor with high permanent magnet utilization efficiency has the auxiliary permanent magnets 6 at the end parts of the rotor, so that the average magnetic density of the permanent magnet synchronous motor axially close to the two sides of the end parts is increased, the average density of the total air gap of the motor is increased, and the high-efficiency utilization of the permanent magnets is realized.
Given the same current at the rated load of the motor, the output torque curves of the conventional interior permanent magnet synchronous motor and the permanent magnet synchronous motor with efficient permanent magnet utilization are shown in fig. 6, and the average torque values are 10.84Nm and 11.72Nm, respectively. Compared with the former, the average torque value of the latter is improved by more than 8% under the premise of the same given current and the same permanent magnet dosage. The reason is that the reduction amount of each main permanent magnet 5 is equal to the total amount of four auxiliary permanent magnets 6 on both sides of the end portion thereof, so that the total volume of all the main permanent magnets 5 and the auxiliary permanent magnets 6 is maintained at a constant value, which is equal to the total amount of the permanent magnets of the rotor of the conventional interior motor. Therefore, compared with the traditional motor, the permanent magnet synchronous motor capable of ensuring the efficient utilization of the permanent magnets can output more than 8% of average torque under the condition that the total permanent magnet consumption is certain and the same armature winding current is given.
The invention has the following beneficial effects:
1) The auxiliary permanent magnets and the magnetic conduction bridges are assembled at the end parts of the two sides of the rotor, and the auxiliary permanent magnets and the magnetic conduction bridges just fill a cavity between the end part of the rotor and the bearing, so that the total volume of the motor is approximately unchanged, the output torque is increased, and high torque density is realized;
2) The auxiliary permanent magnets are assembled at the end parts of the two sides of the rotor and are adjacent to the main permanent magnet, the auxiliary permanent magnets are connected by the magnetic conduction bridges to form a magnetic circuit, the same armature winding current is given, the average output torque value of the motor is improved by 8% compared with that of the traditional built-in permanent magnet synchronous motor under the condition of the same total permanent magnet consumption, and the efficient utilization of the permanent magnets is realized.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the specification and the embodiments, which are fully applicable to various fields of endeavor for which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (8)
1. The utility model provides a high torque density electric motor rotor structure that permanent magnet high efficiency was utilized, a serial communication port, including the rotor, the rotor includes rotor core, leads magnetic bridge, main permanent magnet and vice permanent magnet, main permanent magnet quantity is the polylith, and the polylith main permanent magnet is followed rotor core's circumferencial direction matched stack in the rotor core, every main permanent magnet is followed the both sides of rotor core's axial direction's tip set up two respectively vice permanent magnet, two vice permanent magnet passes through lead magnetic bridge cover and connect, main permanent magnet is followed rotor core's radial magnetization, vice permanent magnet is followed rotor core's axial magnetization.
2. The high torque density motor rotor structure with efficient permanent magnet utilization according to claim 1, wherein: the main permanent magnet and the auxiliary permanent magnet are made of the same permanent magnet material.
3. The rotor structure of a high torque density motor with high efficiency of permanent magnet utilization according to claim 2, characterized in that: the number of the auxiliary permanent magnets is four times that of the main permanent magnets.
4. The high torque density motor rotor structure with efficient permanent magnet utilization according to claim 2, wherein: the magnetic conduction bridge is square.
5. A high torque density motor rotor structure with efficient permanent magnet utilization according to claim 1 or 4, characterized in that: the main permanent magnet is embedded in the rotor iron core, and the total dosage of the auxiliary permanent magnet is formed by the dosage of the two side parts of the end parts of the main permanent magnet close to the upper end and the lower end which are reduced.
6. The rotor structure of a high torque density motor with high efficiency of permanent magnet utilization according to claim 5, characterized in that: the auxiliary permanent magnet is arranged at the axial end part of the rotor core, and the auxiliary permanent magnet is covered and connected by the magnetic conduction bridge.
7. The rotor structure of a high torque density motor with high efficiency of permanent magnet utilization according to claim 5, characterized in that: after the two side parts of the end part of the main permanent magnet close to the upper end and the lower end are reduced, the parts of the hollow groove of the main permanent magnet close to the two sides of the end part are embedded in the rotor core and are filled with the same material as the rotor core.
8. A high torque density electric machine rotor structure with high efficiency of permanent magnet utilization according to claim 1 or 7, characterized in that: the main permanent magnets are evenly distributed along the circumferential direction of the rotor core, and the auxiliary permanent magnets are arranged on the end face of the rotor core and are opposite to the end part of the main permanent magnet in clamping shapes on two axial sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211177652.3A CN115276285A (en) | 2022-09-27 | 2022-09-27 | High-torque-density motor rotor structure with efficient utilization of permanent magnets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211177652.3A CN115276285A (en) | 2022-09-27 | 2022-09-27 | High-torque-density motor rotor structure with efficient utilization of permanent magnets |
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| Publication Number | Publication Date |
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| CN115276285A true CN115276285A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211177652.3A Pending CN115276285A (en) | 2022-09-27 | 2022-09-27 | High-torque-density motor rotor structure with efficient utilization of permanent magnets |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427520A (en) * | 2012-05-25 | 2013-12-04 | 株式会社捷太格特 | Rotor and motor including the rotor |
| CN104716803A (en) * | 2013-12-12 | 2015-06-17 | 松下知识产权经营株式会社 | Permanent magnet synchronous machine |
| CN111279586A (en) * | 2017-10-30 | 2020-06-12 | 诺迈士科技有限公司 | Electric motor |
-
2022
- 2022-09-27 CN CN202211177652.3A patent/CN115276285A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427520A (en) * | 2012-05-25 | 2013-12-04 | 株式会社捷太格特 | Rotor and motor including the rotor |
| CN104716803A (en) * | 2013-12-12 | 2015-06-17 | 松下知识产权经营株式会社 | Permanent magnet synchronous machine |
| CN111279586A (en) * | 2017-10-30 | 2020-06-12 | 诺迈士科技有限公司 | Electric motor |
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Application publication date: 20221101 |
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