CN114243975B - Permanent magnet motor rotor structure - Google Patents

Permanent magnet motor rotor structure Download PDF

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Publication number
CN114243975B
CN114243975B CN202111555255.0A CN202111555255A CN114243975B CN 114243975 B CN114243975 B CN 114243975B CN 202111555255 A CN202111555255 A CN 202111555255A CN 114243975 B CN114243975 B CN 114243975B
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China
Prior art keywords
magnetic
sub
magnetic steel
pressing plate
permanent magnet
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CN202111555255.0A
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CN114243975A (en
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方海洋
李大伟
范兴纲
曲荣海
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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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
    • H02K1/278—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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention discloses a permanent magnet motor rotor structure, and belongs to the field of motors. Comprising the following steps: the rotor and the plurality of magnetic steels surface-adhered to the inner circumference or the outer circumference of the rotor are characterized by further comprising an annular first pressing plate and an annular second pressing plate, and two ends of the plurality of magnetic steels are respectively fixed on the annular first pressing plate and the annular second pressing plate; the magnetic steel is a magnetic steel assembly formed by a plurality of segmented sub-magnetic steels, two sections of each segmented sub-magnetic steel are respectively provided with a convex part and a concave part, and adjacent sub-magnetic steels are matched through the convex parts and the concave parts to form an interlocking structure. The rotor structure can prevent the magnetic steel from falling off in the running process of the motor, and ensures the safe running of the motor. Compared with the traditional structure, the motor has no problem of influencing the torque quality of the motor and causing the torque reduction of the motor with the same volume. And moreover, the installation is simple and convenient, the process is simple, and the production efficiency can be improved.

Description

Permanent magnet motor rotor structure
Technical Field
The invention belongs to the field of motors, and particularly relates to a permanent magnet motor rotor structure.
Background
According to the structural division of the permanent magnet rotor, the permanent magnet motor can be divided into a surface-mounted type and a built-in type. The surface-mounted permanent magnet motor has the advantages of good torque quality, high power factor, small vibration noise and the like, and is widely applied to servo driving and other industries.
In order to reduce the loss of the permanent magnets, the magnetic steel is generally arranged in a structure segmented along the axial direction of the motor, and the segments are insulated to reduce the eddy current loss. Since the permanent magnet is magnetically pulled by the stator core and is magnetically rotated by centrifugal force, it is generally fixed to the rotor yoke by high-strength glue or a sheath, as shown in fig. 1 and 2, in order to prevent the permanent magnet from being separated from the rotor. However, on one hand, the glue between the magnetic steel and the rotor yoke is difficult to ensure uniform thickness, and the positions of the magnetic steels are easy to be different, so that the torque quality is influenced; on the other hand, the sheath occupies an air gap space, the air gap of the motor is increased, and the motor torque with the same volume is reduced.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a permanent magnet motor rotor structure, which aims to solve the problem that torque quality is influenced due to the fact that magnetic steel and a rotor yoke are fixed through glue in a traditional mode, and the problem that the torque of a motor with the same volume is reduced due to the fact that a jacket occupies an air gap space.
To achieve the above object, the present invention provides a rotor structure of a permanent magnet motor, comprising: the rotor and the plurality of magnetic steels surface-adhered to the inner circumference or the outer circumference of the rotor further comprise annular first pressing plates and annular second pressing plates, and two ends of the plurality of magnetic steels are respectively fixed on the annular first pressing plates and the annular second pressing plates; the magnetic steel is a magnetic steel assembly formed by a plurality of segmented sub-magnetic steels, two sections of each segmented sub-magnetic steel are respectively provided with a convex part and a concave part, and adjacent sub-magnetic steels are matched through the convex parts and the concave parts to form an interlocking structure.
Further, the first pressing plate and the second pressing plate are respectively attached to the protruding portions and the recessed portions at two ends of the magnetic steel assembly.
Further, the shape of the sub-magnetic steel forming the interlocking structure is V-shaped, semicircular or zigzag.
Further, high-strength structural adhesive is arranged between the adjacent sub-magnetic steels and between the first pressing plate and the second pressing plate and the sub-magnetic steels attached to the first pressing plate and the second pressing plate respectively.
Further, the material of the sub-magnetic steel is neodymium-iron-boron, samarium-cobalt, alnico or ferrite permanent magnetic material.
Further, the first and second pressure plates are of a non-conductive, non-magnetically permeable material.
Further, the non-conductive and non-magnetic material is plastic or glass fiber reinforced plastic.
Further, the first pressing plate and the second pressing plate are fixed on the rotor through bolts.
In general, through the above technical solutions conceived by the present invention, the following beneficial effects can be obtained:
(1) According to the permanent magnet motor rotor structure, two ends of a plurality of magnetic steels are respectively fixed on the annular pressing plate, each magnetic steel is formed into a magnetic steel assembly by a plurality of segmented sub-magnetic steels, adjacent sub-magnetic steels are matched through the convex parts and the concave parts to form an interlocking structure, the magnetic pulling force of a stator core borne by each sub-magnetic steel and the centrifugal force borne by the adjacent sub-magnetic steel during rotation are balanced with the supporting force provided by the adjacent sub-magnetic steels and the force provided by the pressing plates at two sides, so that the influence of stress of each segmented sub-magnetic steel is counteracted, the magnetic steel is prevented from falling off in the motor operation process, and the safe operation of the motor is ensured. Because the fixing structure of the magnetic steel and the stator does not use glue and the sheath, the problem that the torque quality is affected due to inconsistent positions of the magnetic steels caused by the fact that the thickness of the glue is difficult to ensure uniformity between the magnetic steel and the rotor yoke in the traditional mode is avoided, and the problem that the motor torque with the same volume is reduced due to the fact that the sheath occupies an air gap space is avoided.
(2) High-strength structural adhesive is arranged between adjacent sub-magnetic steels and between the first pressing plate and the second pressing plate respectively attached to the sub-magnetic steels, so that the whole magnetic steel assembly and the pressing plate are further tightly laminated.
(3) Preferably, the first pressing plate and the second pressing plate are made of non-conductive non-magnetic materials, so that the insulation performance of the magnetic steel is guaranteed, and the magnetic performance of the magnetic steel is not damaged.
(4) The magnetic steel is preferably made of neodymium iron boron, samarium cobalt, aluminum nickel cobalt, ferrite permanent magnetic materials and the like, and has the advantages of higher magnetic energy product, higher coercive force, higher remanence and the like, and higher stability.
In summary, the magnetic steel and the rotor structure can prevent the magnetic steel from falling off in the running process of the motor, and ensure the safe running of the motor. Compared with the traditional structure, the motor has no problem of influencing the torque quality of the motor and causing the torque reduction of the motor with the same volume. And moreover, the installation is simple and convenient, the process is simple, and the production efficiency can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional inner rotor surface-mounted permanent magnet motor.
Fig. 2 is a schematic structural diagram of a conventional external rotor surface-mounted permanent magnet motor.
Fig. 3 is a schematic diagram of a motor magnetic steel structure according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a V-shaped sub-magnetic steel structure according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of connection between an inner rotor of V-shaped sub-magnetic steel and a pressing plate according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of connection between an outer rotor of V-shaped sub-magnetic steel and a pressing plate according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an inner rotor according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of an outer rotor according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of stress distribution of inner rotor magnetic steel according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of stress distribution of outer rotor magnetic steel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the present invention, the terms "first," "second," and the like in the description and in the drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
As shown in fig. 3-8, the invention provides a permanent magnet motor rotor structure, which mainly comprises a rotor, a plurality of magnetic steels attached to the inner circumference or the outer circumference of the rotor, and also comprises an annular first pressing plate and an annular second pressing plate, wherein two ends of the magnetic steels are respectively fixed on the annular first pressing plate and the annular second pressing plate; each magnetic steel is a magnetic steel assembly formed by a plurality of segmented sub-magnetic steels, two sections of each segmented sub-magnetic steel are respectively provided with a convex part and a concave part, and adjacent sub-magnetic steels are matched through the convex parts and the concave parts to form an interlocking structure.
One ends of the convex parts of the magnetic steels formed by the magnetic steel assemblies are pressed and fixed by a first pressing plate which is attached to the convex parts and provided with concave parts, one ends of the concave parts formed by the magnetic steel assemblies are provided with a plurality of concave parts, the second pressing plate with the protrusions is pressed and fixed through the second pressing plate which is attached to the second pressing plate, so that the plurality of sectional sub-magnetic steels are tightly stacked together and fixed on the rotor. The other side of the two pressing plates, which is not contacted with the magnetic steel assembly, is not particularly required. Preferably, high-strength structural adhesive is further arranged between adjacent sub-magnetic steels and between two pressing plates and the sub-magnetic steel contacted with the magnetic steel assembly, so that the whole magnetic steel assembly and the pressing plates are further tightly laminated.
The sub-magnetic steel forming the interlocking structure can be V-shaped sub-magnetic steel, can also be semicircular or zigzag, and the like, and can enable adjacent sub-magnetic steel to form the interlocking structure and mutually support.
The inner and outer surfaces of each sub-magnetic steel can be arc-shaped, planar or other curved surfaces.
The magnetic steel assembly in the embodiment is a plurality of sections of sub-magnetic steel, and an interlocking structure can be formed between the sections of sub-magnetic steel; the sectional sub-magnetic steel can reduce the eddy current loss of the magnetic steel assembly, reduce the influence on the temperature rise of the rotor, and the magnetic performance of each sub-magnetic steel is consistent.
The materials of the first pressing plate and the second pressing plate can be non-conductive and non-magnetic materials, such as plastics, glass fiber reinforced plastics and the like, and the insulating property of the magnetic steel is guaranteed, and the magnetic property of the magnetic steel is not damaged. But also can be non-magnetic materials such as copper, aluminum alloy and the like. The magnetic steel is preferably made of neodymium iron boron, samarium cobalt, aluminum nickel cobalt, ferrite permanent magnetic materials and the like, and has the advantages of higher magnetic energy product, higher coercive force, higher remanence and the like, and higher stability.
The two pressing plates and the rotor are axially fixed on the rotor through bolts, so that the two ends of the magnetic steel assembly are pressed and fixed. When the rotor rotates, the pressing plates are fixed, the magnetic steel assembly is clamped between the two pressing plates, the whole magnetic steel can be firmly fixed on the rotor, the magnetic steel is prevented from being thrown out when the rotor rotates, the structure is stable, the reliability is high, and the service life and the safety coefficient of the motor are improved.
For the inner rotor structure, the magnetic pulling force of the stator core born by each sub-magnetic steel and the centrifugal force born by the rotor magnetic steel during rotation are balanced with the supporting force provided by the adjacent sub-magnetic steel, so that the influence of the stress of each sectional sub-magnetic steel is counteracted; after the plurality of sub-magnet steels of segmentation form interlocking structure, through pressing it with the concave or bellied clamp plate of area that laminates rather than the both ends of formation magnet steel assembly fixed, make the magnet steel assembly support each other between two clamp plates, the clamp plate at both ends is the holding power that the sub-magnet steel of magnet steel assembly both ends department provided and adjacent sub-magnet steel provided for this sub-magnet steel with the magnetic pulling force of the stator core that this sub-magnet steel received and the centrifugal force that receives when rotatory balanced to offset the influence of the atress of sub-magnet steel of both ends department, avoid the magnet steel departure. For the outer rotor structure, the magnetic pulling force of the stator core born by each sub-magnetic steel is balanced with the supporting force provided by the adjacent magnetic steel, so that the influence of the stress of each segmented sub-magnetic steel is counteracted, and the magnetic pulling force of the stator side is prevented from attracting the magnetic steel; at the two ends, the supporting force provided by the pressing plate and the adjacent sub-magnet steel of the sub-magnet steel at the two ends for the sub-magnet steel at the two ends is balanced with the magnetic pulling force of the stator core born by the sub-magnet steel, so that the influence of the stress of the sub-magnet steel at the two ends is counteracted, and the whole magnet steel is fixed.
Taking the V-shaped sub-magnetic steel as an example, the stress situation is shown in fig. 9 and 10. For the inner rotor structure, F is arranged at two ends of the magnetic steel structure 1N Supporting force provided by the first pressing plate or the second pressing plate to the sub-magnetic steel at one end of the magnetic steel assembly, F 2N The supporting force provided for the adjacent sub-magnetic steel by the sub-magnetic steel is F Pulling device For each sub-magnetic steel receiving the magnetic tension of the stator core, F Centrifuging F is the centrifugal force applied to each sub-magnetic steel during rotation 1N 、F 2N And F is equal to Pulling device 、F Centrifuging Is a pair of balanced forces. At other sub-magnetic steel (except the sub-magnetic steel at two ends) of the magnetic steel structure, F 3N 、F 4N Supporting forces respectively provided by two adjacent sub-magnetic steels to the sub-magnetic steels, F 3N 、F 4N And F is equal to Pulling device 、F Centrifuging Is a pair of balanced forces. For the outer rotor structure, F 1N Supporting force provided by the pressing plate to the magnetic steel, F 2N 、F 3N 、F 4N And supporting force provided for the adjacent magnetic steel to the magnetic steel. F (F) 1N 、F 2N And F is equal to Pulling device Is a pair of balance forces; f (F) 3N 、F 4N And F is equal to Pulling device Is a pair of balanced forces.
When the magnetic steel assembly is in operation, when the magnetic steel assembly is subjected to the attraction effect of the stator core, namely the magnetic pulling force or the centrifugal force during rotation, the adjacent sub magnetic steels and the magnetic steel assembly and the two pressing plates are mutually supported to form interlocking, so that the fixation of the magnetic steel on the stator is realized. The motor magnetic steel and the pressing plate form a stable connecting structure, so that the magnetic steel is prevented from falling off in the use process of the motor, and the safe operation of the motor is ensured; meanwhile, as the glue and the sheath are not used in the method for fixing the rotor and the magnetic steel, the problems that the glue between the magnetic steel and the rotor yoke is difficult to ensure the uniform thickness and the positions of the magnetic steels are different easily, the sheath occupies an air gap space and the air gap of the motor is increased are avoided, and therefore the torque quality and the reduction of the motor torque with the same volume are not affected.
The rotor structure provided by the invention can ensure that a plurality of magnetic steels can be firmly fixed on the rotor, so that the magnetic steels are prevented from being thrown out when the rotor rotates, the structure is stable, the reliability is high, and the service life and the safety coefficient of the motor are improved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (8)

1. A permanent magnet motor rotor structure comprising: the rotor and the plurality of magnetic steels surface-adhered to the inner circumference or the outer circumference of the rotor are characterized by further comprising an annular first pressing plate and an annular second pressing plate, and two ends of the plurality of magnetic steels are respectively fixed on the annular first pressing plate and the annular second pressing plate; the magnetic steel is a magnetic steel assembly formed by a plurality of segmented sub-magnetic steels, two sections of each segmented sub-magnetic steel are respectively provided with a convex part and a concave part, and adjacent sub-magnetic steels are matched through the convex parts and the concave parts to form an interlocking structure;
after the plurality of sectional sub-magnetic steels form an interlocking structure, the two ends of the formed magnetic steel assembly are pressed and fixed through pressing plates which are attached to the magnetic steel assembly and are provided with concave or convex parts, so that the magnetic steel assembly and the two pressing plates are mutually supported, the supporting force provided by the pressing plates at the two ends of the magnetic steel assembly for the sub-magnetic steels and the supporting force provided by the adjacent sub-magnetic steels for the sub-magnetic steels are balanced with the magnetic pulling force of the stator core born by the sub-magnetic steels and the centrifugal force born by the stator core during rotation.
2. The permanent magnet motor rotor structure according to claim 1, wherein the first pressing plate and the second pressing plate are respectively attached to the protruding portions and the recessed portions at two ends of the plurality of magnetic steel assemblies.
3. A permanent magnet motor rotor structure according to claim 1 or 2, wherein the shape of the sub-magnets forming the interlocking structure is V-shaped, semi-circular or zigzag.
4. The permanent magnet motor rotor structure according to claim 3, wherein high-strength structural adhesive is arranged between the adjacent sub-magnetic steels and between the sub-magnetic steels to which the first pressing plate and the second pressing plate are respectively attached.
5. The rotor structure of claim 4, wherein the material of the sub-magnetic steel is neodymium-iron-boron, samarium-cobalt, alnico or ferrite permanent magnet material.
6. The permanent magnet motor rotor structure of claim 5 wherein the first and second platens are of a non-conductive, non-magnetically permeable material.
7. The permanent magnet motor rotor structure of claim 6 wherein the non-conductive, non-magnetically permeable material is plastic or fiberglass.
8. The permanent magnet motor rotor structure of claim 7 wherein the first and second pressure plates are bolted to the rotor.
CN202111555255.0A 2021-12-17 2021-12-17 Permanent magnet motor rotor structure Active CN114243975B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111555255.0A CN114243975B (en) 2021-12-17 2021-12-17 Permanent magnet motor rotor structure

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Application Number Priority Date Filing Date Title
CN202111555255.0A CN114243975B (en) 2021-12-17 2021-12-17 Permanent magnet motor rotor structure

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CN114243975A CN114243975A (en) 2022-03-25
CN114243975B true CN114243975B (en) 2023-06-06

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004312876A (en) * 2003-04-07 2004-11-04 Yaskawa Electric Corp Rotor of ac motor
JP5422175B2 (en) * 2008-11-05 2014-02-19 三菱重工業株式会社 Linear actuator
JP2019205322A (en) * 2018-05-25 2019-11-28 Tdk株式会社 Permanent magnet and motor
CN109861422A (en) * 2018-12-04 2019-06-07 上海大学 A kind of novel rotor applied to high-speed permanent magnet motor

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