CN110277850B - Permanent magnet motor rotor structure and installation method - Google Patents
Permanent magnet motor rotor structure and installation method Download PDFInfo
- Publication number
- CN110277850B CN110277850B CN201910635845.0A CN201910635845A CN110277850B CN 110277850 B CN110277850 B CN 110277850B CN 201910635845 A CN201910635845 A CN 201910635845A CN 110277850 B CN110277850 B CN 110277850B
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- rotor
- magnetic steel
- sheath
- rotor core
- closing
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- 238000000034 method Methods 0.000 title claims description 12
- 238000009434 installation Methods 0.000 title claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 77
- 239000010959 steel Substances 0.000 claims abstract description 77
- 230000005389 magnetism Effects 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010408 sweeping 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]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a permanent magnet motor rotor structure, which comprises: the rotor core is provided with a through hole at the center, the cross section of the rotor core is in a regular polygon shape, the periphery of the rotor core is provided with a magnetism isolating groove at the boundary of the side edges, the magnetic steel fixing parts are partially injected into the magnetism isolating groove, the magnetic steel fixing parts are in a T shape, the magnetic steel is inserted into cavities formed by the adjacent two T-shaped magnetic steel fixing parts and the surfaces of the rotor core, the rotary shaft is pressed into the through hole at the center of the rotor core, and the magnetic steel fixing parts also comprise side baffle rings at the two sides of the rotor core; the rotor sheath is cylindrical, one side of the rotor sheath is provided with a closing-in opening which is preset to be folded towards the center of a circle, and the closing-in opening is in a circular ring shape; the rotor sheath is sleeved outside the rotor core, one side of the closing-in is positioned at the shaft extending side, the other side of the rotor sheath is folded towards the circle center, and the closing-in is annular. The magnetic flux leakage rate is low, the material is saved, and the working efficiency is high.
Description
Technical Field
The invention relates to a permanent magnet motor rotor structure, and belongs to the field of motors.
Background
The existing small permanent magnet motor rotor adopts a magnetic cylinder structure, the magnetic cylinder structure has high cost compared with an arch-shaped magnetic steel structure, the outside of the magnetic cylinder is directly exposed in an air gap, scraps generated by the rotor in the running process are directly introduced into the air gap of the motor, and noise is easily generated by the motor. For a rotor adopting surface-mounted structural magnetic steel, a dovetail groove is generally adopted for fixing the magnetic steel by a rotor core, so that the magnetic resistance at the junction of the magnetic steel is small, and the magnetic leakage is serious. The straight cylinder sheath for external sleeve needs to be fixed by glue, the working procedure is complex, the glue adhesion is troublesome, and the quality is unstable.
Disclosure of Invention
The invention aims to provide a permanent magnet motor rotor structure with low magnetic leakage rate, material saving and high working efficiency.
In order to achieve the above purpose, one technical scheme of the invention is as follows: a permanent magnet motor rotor structure comprising: the rotor core is provided with a through hole at the center, the cross section of the rotor core is in a regular polygon shape, the periphery of the rotor core is provided with a magnetism isolating groove at the boundary of the side edges, the magnetic steel fixing parts are partially injected into the magnetism isolating groove, the magnetic steel fixing parts are in a T shape, the magnetic steel is inserted into cavities formed by the adjacent two T-shaped magnetic steel fixing parts and the surfaces of the rotor core, the rotary shaft is pressed into the through hole at the center of the rotor core, and the magnetic steel fixing parts also comprise side baffle rings at the two sides of the rotor core; the rotor sheath is cylindrical, one side of the rotor sheath is provided with a closing-in opening which is preset to be folded towards the center of a circle, and the closing-in opening is in a circular ring shape; the rotor sheath is sleeved outside the rotor core, one side of the closing-in is positioned at the shaft extending side, the other side of the rotor sheath is folded towards the circle center, and the closing-in is annular.
According to the invention, the magnetism isolating grooves are arranged at the regular polygon junction, the magnetic resistance can be increased, the magnetic leakage is reduced, the magnetic steel fixing parts are partially injected into the magnetism isolating grooves, the magnetic steel fixing parts are in a T shape, the magnetic steel is inserted into a cavity formed by the two T-shaped magnetic steel fixing parts and the polygon surface of the rotor core, the magnetic steel fixing parts have certain elasticity, the magnetic steel is pressed towards the circle center by the two upper T-shaped magnetic steel fixing parts under the condition of impact vibration, the magnetic steel can be firmly fixed in the cavity in the radial direction, the cavity formed by the two T-shaped magnetic steel fixing parts and the polygon surface of the rotor core is a semi-plastic package structure of the magnetic steel, materials are saved compared with the whole plastic package, the magnetic steel fixing parts at the iron cores at the two sides of the motor rotor are provided with side baffle rings, the function of axially fixing the magnetic steel is achieved, on the one hand, on the other hand, the chip generated in the rotor assembly process can be limited in the rotor jacket, and the chip generated by material aging in the rotor operation process can be limited in the rotor jacket, thus the operation noise of the motor is reduced.
The rotor sheath is cylindrical, one side of the rotor sheath is preset with a closing-in opening which is folded towards the center of a circle, and the closing-in opening is annular. The preset closing-in can transfer part of working procedures of the production line to off-line completion, and on-line assembly time can be saved. The rotor sheath can be fixed in the axial direction by being matched with the closing-in of the other side. The binding off of both sides is the ring form, can improve assembly efficiency, and can the axial fixity rotor sheath.
The inner diameter of a closing-in circular ring is preset at one side of the rotor sheath, the outer diameter is D2, D2-D1 is more than 6mm, after one side of the rotor sheath is pre-closed, the distance between two side baffle rings of the rotor core is H1, the height of the rotor sheath is H2, H1-H2 is less than or equal to 2mm and less than or equal to 5mm, the inner diameter of a closing-in circular ring at the other side of the rotor sheath is D3, the outer diameter is D2, and D2-D3 is less than or equal to 4mm and less than or equal to 6mm. D2-D1 is the part that covers on fixed plastic annular structure surface recess, if the numerical value is less than 6mm, the riveting part diminishes, and riveting quality just can drop, accomplishes the default binding off with the frock, and when D2-D1 > 6mm, still can guarantee that binding off department is more even, can not warp and outstanding. After one side of the rotor sheath is pre-closed, the distance between the two sides of the rotor and the plastic annular structure is H1, the height of the rotor sheath is H2, H1-H2 is less than or equal to 5mm, H1-H2 is the size of the closing-in at the other side, the closing-in allowance is too small when the size is less than 2mm, the closing-in is not obvious, the rotor sheath is easy to axially fall off, the side can only be closed and formed by virtue of the fixed plastic annular structure, when the size is greater than 5mm, the closing-in part can be tilted and protrude, the risk of rotor sweeping exists, the inner diameter of a closing-in ring at the other side of the rotor sheath is D3, the outer diameter is D2, D2-D3 is less than or equal to 6mm, the axial fixing effect on the rotor sheath is poor when D2-D3 is less than 4mm, and the closing-in effect is poor when D2-D3 is greater than 6mm.
The highest point of the magnetic steel after the magnetic steel is inserted and the highest point of the magnetic steel fixing piece are positioned on the same circle, the diameter of the magnetic steel is D, the inner diameter of the rotor sheath is D, and D-D is more than or equal to 0.15mm and less than or equal to 0.3mm. Because the highest point of the magnetic steel after being inserted cannot be completely on the same circle, when the D-D is smaller than 0.15mm, the sheath is difficult to insert, but when the D-D is larger than 0.3mm, the sheath is not tightly attached to the magnetic steel, and noise is generated after the motor operates.
The side baffle ring surface of one side of the non-shaft extending end of the magnetic steel fixing piece is also provided with a groove.
The number of edges of the regular polygon on the outer side of the rotor core is equal to the number of the magnetic steels, and the number of the T-shaped magnetic steel fixing pieces is 1 time of the number of the magnetic steels.
The side baffle ring is provided with a rounding with the radius of 0.1mm; the closing-in bending parts on two sides of the rotor sheath are provided with rounding, and the radius of the rounding is 0.1mm.
The outer diameter of the rotor structure of the permanent magnet motor is smaller than 100mm, and the thickness of the rotor sheath is smaller than 0.2mm.
The other technical scheme of the invention is as follows: during installation, pressure is applied to the rotor sheath covered on the surface groove of the magnetic steel fixing piece, the rotor sheath deforms and enters the surface groove of the magnetic steel fixing piece, and the rotor sheath deforms and is fixed in the radial direction through entering the surface groove when the rotor rotates. According to the method, the rotor sheath with one side covered on the groove on the surface of the fixed plastic annular structure can be riveted to achieve the double-side riveting effect. The assembly cost is reduced.
After the technical scheme is realized, the permanent magnet motor rotor structure achieves the two-point effects of low magnetic leakage rate, material saving and high working efficiency through the combined action of the magnetism isolating grooves and the side baffle rings on the two sides of the rotor core.
Drawings
The invention is described in further detail below with reference to examples given in the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an explosive structure according to the present invention;
FIG. 3 is a schematic diagram of a magnetic steel structure according to the present invention;
Fig. 4 is a schematic structural view of a rotor core according to the present invention;
FIG. 5 is an angular structural axial view of the magnetic steel fixture of the present invention after injection into a rotor core;
FIG. 6 is a structural axial view of another angle of the magnetic steel fixing member of the present invention after being injected into the rotor core;
FIG. 7 is a schematic view of a rotor jacket construction;
Fig. 8 is a schematic view of the structure of the present invention without the rotor sheath installed.
Detailed Description
The invention is further illustrated by the following examples.
As shown in fig. 1 to 8, a permanent magnet motor rotor structure includes: the rotor comprises a rotating shaft 1, magnetic steel 2, a rotor core 3, a magnetic steel fixing piece 4 and a rotor sheath 5, wherein a through hole 3-1 is formed in the center of the rotor core 3, the section of the rotor core 3 is in a regular polygon shape, a magnetism isolating groove 6 is formed in the periphery of the rotor core 3 at the boundary of sides, the magnetic steel fixing piece 4 is partially injected into the magnetism isolating groove 6, the magnetic steel fixing piece 4 is in a T shape, the magnetic steel 2 is inserted into a cavity 7 formed by two adjacent T-shaped magnetic steel fixing pieces 4 and the surface of the rotor core 3, and the rotating shaft 1 is pressed into the through hole 3-1 in the center of the rotor core 3, and the rotor is characterized in that: the magnetic steel fixing piece 4 also comprises side baffle rings 4-1 at two sides of the rotor core 3; the rotor sheath 5 is cylindrical, one side of the rotor sheath is provided with a closing-in opening which is preset to be folded towards the center of a circle, and the closing-in opening is in a circular ring shape; the rotor sheath 5 is sleeved outside the rotor core 3, one side of the closing opening is positioned at the shaft extending side, the other side of the rotor sheath 5 is folded towards the circle center, and the closing opening is annular.
In the invention, the magnetic steel fixing piece 4 is PBT (polybutylene terephthalate) and 30% glass fiber, and the rotor sheath 5 is made of stainless steel 304.
The front projection of the magnetic steel is in an arch shape.
The inner diameter of a closing-in circular ring is preset at one side of a rotor sheath 5 to be D1, the outer diameter is D2, D2-D1 is more than 6mm, after one side of the rotor sheath is pre-closed, the distance between two side baffle rings 4-1 of a rotor core 3 is H1, the height of the rotor sheath 5 is H2, H1-H2 is less than or equal to 2mm and less than or equal to 5mm, the inner diameter of a closing-in circular ring at the other side of the rotor sheath is D3, the outer diameter is D2, and D2-D3 is less than or equal to 4mm and less than or equal to 6mm.
The highest point of the magnetic steel 2 and the highest point of the magnetic steel fixing piece 4 are positioned on the same circle after the magnetic steel 2 is inserted, the diameter of the magnetic steel is D, the inner diameter of the rotor sheath 5 is D, and D-D is more than or equal to 0.15mm and less than or equal to 0.3mm.
The side baffle ring 4-1 surface of the magnetic steel fixing piece 4 at one side of the non-shaft extending end is also provided with a groove 4-2.
The number of edges of the regular polygon on the outer side of the rotor core 3 is equal to the number of the magnetic steels, and the number of the T-shaped magnetic steel fixing pieces 4 is 1 time of the number of the magnetic steels.
The side baffle ring 4-1 is provided with a rounding with the radius of 0.1mm; the two sides of the rotor sheath 5 are provided with a rounding at the closing-in bending positions, and the radius of the rounding is 0.1mm.
The outer diameter of the rotor structure of the permanent magnet motor is smaller than 100mm, and the thickness of the rotor sheath 5 is smaller than 0.2mm.
When the rotor is installed, pressure is applied to the rotor sheath 5 covered on the surface groove 4-2 of the magnetic steel fixing piece 4, the rotor sheath 5 is deformed and enters the surface groove 4-2 of the magnetic steel fixing piece 4, and when the rotor rotates, the rotor sheath 5 is deformed through entering the surface groove 4-2, so that the rotor sheath 5 is fixed in the radial direction. According to the method, the rotor sheath with one side covered on the groove on the surface of the fixed plastic annular structure can be riveted to achieve the double-side riveting effect. The assembly cost is reduced.
In the specific implementation process of the initial sample, the assembly process is simple, the rotor structure is reliable, the motor performance is stable, and a good use effect is achieved.
Claims (6)
1. A permanent magnet motor rotor structure comprising: the rotor comprises a rotating shaft (1), magnetic steel (2), a rotor core (3), a magnetic steel fixing piece (4) and a rotor sheath (5), wherein a through hole (3-1) is formed in the center of the rotor core (3), the cross section of the rotor core (3) is of a regular polygon, a magnetism isolating groove (6) is formed in the periphery of the rotor core (3) at the boundary of the side edges, the magnetic steel fixing piece (4) is partially injected into the magnetism isolating groove (6), the magnetic steel fixing piece (4) is of a T shape, the magnetic steel (2) is inserted into a cavity (7) formed in the surfaces of the adjacent two T-shaped magnetic steel fixing pieces (4) and the rotor core (3), and the rotating shaft (1) is pressed into the center through hole (3-1) of the rotor core (3), and the rotor core is characterized in that: the magnetic steel fixing piece (4) also comprises side baffle rings (4-1) at two sides of the rotor core (3); the rotor sheath (5) is cylindrical, one side of the rotor sheath is provided with a closing-in opening which is preset to be folded towards the center of a circle, and the closing-in opening is annular; the rotor sheath (5) is sleeved outside the rotor core (3), one side of the closing-in is positioned at the shaft extension side, the other side of the rotor sheath (5) is folded towards the circle center, and the closing-in is annular; the inner diameter of a closing-in circular ring is preset at one side of a rotor sheath (5) and the outer diameter is D2, D2-D1 is more than 6mm, after one side of the rotor sheath is pre-closed, the distance between two side baffle rings (4-1) of a rotor core (3) is H1, the height of the rotor sheath (5) is H2, H1-H2 is less than or equal to 2mm and less than or equal to 5mm, the inner diameter of the closing-in circular ring at the other side of the rotor sheath is D3, the outer diameter is D2, and D2-D3 is less than or equal to 4mm and less than or equal to 6mm; the surface of the side baffle ring (4-1) of one side of the non-shaft extending end of the magnetic steel fixing piece (4) is also provided with a groove (4-2).
2. The permanent magnet motor rotor structure of claim 1, wherein: the highest point of the magnetic steel (2) and the highest point of the magnetic steel fixing piece (4) are positioned on the same circle after the magnetic steel (2) is inserted, the diameter of the magnetic steel is D, the inner diameter of the rotor sheath (5) is D, and D-D is more than or equal to 0.15mm and less than or equal to 0.3mm.
3. The permanent magnet motor rotor structure of claim 1, wherein: the number of edges of the regular polygon outside the rotor core (3) is equal to the number of the magnetic steels, and the number of the T-shaped magnetic steel fixing pieces (4) is 1 time of the number of the magnetic steels.
4. The permanent magnet motor rotor structure of claim 1, wherein: the side baffle ring (4-1) is provided with a rounding with the radius of 0.1mm; the closing-in bending parts on two sides of the rotor sheath (5) are provided with rounding, and the radius of the rounding is 0.1mm.
5. The permanent magnet motor rotor structure of claim 1, wherein: the outer diameter of the rotor structure of the permanent magnet motor is smaller than 100mm, and the thickness of the rotor sheath (5) is smaller than 0.2mm.
6. A method for installing a rotor structure of a permanent magnet motor according to claims 1 to 5, characterized in that: during installation, pressure is applied to the rotor sheath (5) covered on the surface groove (4-2) of the magnetic steel fixing piece (4), the rotor sheath (5) is deformed and enters the surface groove (4-2) of the magnetic steel fixing piece (4), and the rotor sheath (5) is deformed through entering the surface groove (4-2) during rotation of the rotor, so that the rotor sheath (5) is fixed in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910635845.0A CN110277850B (en) | 2019-07-15 | 2019-07-15 | Permanent magnet motor rotor structure and installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910635845.0A CN110277850B (en) | 2019-07-15 | 2019-07-15 | Permanent magnet motor rotor structure and installation method |
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| Publication Number | Publication Date |
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| CN110277850A CN110277850A (en) | 2019-09-24 |
| CN110277850B true CN110277850B (en) | 2024-05-24 |
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| CN201910635845.0A Active CN110277850B (en) | 2019-07-15 | 2019-07-15 | Permanent magnet motor rotor structure and installation method |
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| CN110912300A (en) * | 2019-11-07 | 2020-03-24 | 联创汽车电子有限公司 | Rotating shaft and motor rotor unit |
| CN110912306A (en) * | 2019-12-11 | 2020-03-24 | 杭州美时美刻物联网科技有限公司 | Rotor structure of permanent magnet servo motor |
| CN112134394A (en) * | 2020-10-12 | 2020-12-25 | 珠海宇飞科技有限公司 | High-impact-resistance motor and mounting method thereof |
| CN112202257B (en) * | 2020-10-19 | 2021-08-24 | 哈尔滨泉智海特电气有限公司 | Rotor structure of permanent magnet servo motor |
| CN116599304B (en) * | 2023-06-16 | 2024-10-01 | 宁波风正磁应用科技有限公司 | Forming device of polygonal sheath of permanent magnet rotor, polygonal sheath and manufacturing method |
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