CN111585370A - Silicon steel sheet with low-stress magnetic isolation bridge, motor rotor and motor - Google Patents
Silicon steel sheet with low-stress magnetic isolation bridge, motor rotor and motor Download PDFInfo
- Publication number
- CN111585370A CN111585370A CN202010508175.9A CN202010508175A CN111585370A CN 111585370 A CN111585370 A CN 111585370A CN 202010508175 A CN202010508175 A CN 202010508175A CN 111585370 A CN111585370 A CN 111585370A
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- steel sheet
- silicon steel
- rotor
- magnetic
- groove
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to the technical field of motors, in particular to a silicon steel sheet with a low-stress magnetic isolation bridge, a motor rotor and a motor. Including the silicon steel sheet, set up the magnetic steel groove on the silicon steel sheet and inlay and establish magnetic steel assembly in the magnetic steel groove, magnetic steel assembly includes a plurality of magnet steel groups, magnet steel group is including a pair of little permanent magnet that is close to the rotor edge and a pair of big permanent magnet that is close to the rotor inboard, the silicon steel sheet is equipped with the radial fluting that extends from the edge to the center between two big permanent magnets of adjacent magnet steel group. The rigidity difference of iron cores on the left side and the right side of the large permanent magnet can be reduced, so that the stress at the magnetic isolation bridge is effectively reduced, and the magnetic steel and the iron cores are prevented from being deformed and broken.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a silicon steel sheet with a low-stress magnetic isolation bridge, a motor rotor and a motor.
Background
The built-in permanent magnet synchronous motor has the advantages of high efficiency, high power density, small volume and wide speed regulation range, and is widely applied to the new energy automobile market. The rigidity of iron cores on two sides of a permanent magnet of the existing motor is different, so that the stress of a magnetic isolation bridge at the end part of the permanent magnet is larger. When the centrifugal force generated when the motor rotates at a high speed acts on the magnetic steel of the motor rotor and the rotor iron core, the magnetic steel and the iron core can be deformed and broken, so that the performance and the safety stability of the motor are influenced. In view of this, there is a need to optimize the existing rotor structure and design a structure that can effectively reduce the stress on the critical position of the rotor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a silicon steel sheet with a low-stress magnetic isolation bridge, a motor rotor and a motor, which can achieve the effect of stress dispersion on the basis of ensuring the electromagnetic performance of the motor, thereby effectively isolating the stress at the magnetic bridge.
The invention relates to a silicon steel sheet with a low-stress magnetic isolation bridge, which adopts the technical scheme that:
including the silicon steel sheet, set up the magnetic steel groove on the silicon steel sheet and inlay and establish magnetic steel assembly in the magnetic steel groove, magnetic steel assembly includes a plurality of magnet steel groups, magnet steel group is including a pair of little permanent magnet that is close to the rotor edge and a pair of big permanent magnet that is close to the rotor inboard, the silicon steel sheet is equipped with the radial fluting that extends from the edge to the center between two big permanent magnets of adjacent magnet steel group.
Preferably, the radial slot comprises a rectangular slot, the direction of the rectangular slot extending along the radial direction is the length direction of the rectangular slot, and the long symmetry axis of the rectangular slot is coincident with the q axis of the rotor.
Preferably, the radial slot further comprises a circular groove, the circular groove is arranged at one end, facing the center of the rotor, of the rectangular groove, the circular groove is communicated with the rectangular groove, and the center of the circular groove is overlapped with the q axis of the rotor.
Preferably, the diameter of the circular groove is larger than the width of the rectangular groove.
Preferably, a magnetic isolation bridge is arranged between the magnetic steel groove and the outer edge of the silicon steel sheet.
Preferably, the end part of the magnetic steel slot is provided with an air slot.
Preferably, the pair of small permanent magnets and the pair of large permanent magnets are distributed in a splayed manner, the opening end of the splayed manner faces the outer edge of the silicon steel sheet, and the symmetric axes of the pair of small permanent magnets and the pair of large permanent magnets are coincided with the d axis of the rotor.
The invention has the beneficial effects that: the radial slot is arranged at the position of the q axis between the two large permanent magnets, so that the rigidity difference of iron cores on the left side and the right side of the large permanent magnets can be reduced, the stress at the magnetic isolation bridge is effectively reduced, and the magnetic steel and the iron cores are prevented from being deformed and broken. Meanwhile, the using amount of silicon steel sheets of the rotor core is reduced, the quality and the cost of the rotor are reduced, the centrifugal force of the rotor is further reduced, and the stress reduction effect at the magnetic isolation bridge of the rotor is improved. In addition, the rectangular groove and the circular groove are communicated and combined to form the radial slot, so that the stress at the magnetic isolation bridge can be reduced to the greatest extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged partial schematic view of the present invention;
FIG. 3 is a schematic view of a magnetic isolation bridge stress simulation before radial slotting is arranged;
FIG. 4 is a schematic diagram of a magnetic isolation bridge stress simulation after radial slotting.
In the figure: 1-silicon steel sheet, 2-magnetic steel groove, 3-small permanent magnet, 4-large permanent magnet, 5-radial slotting, 6-rectangular groove, 7-circular groove, 8-magnetic isolation bridge, 9-air groove, 10-lightening hole and 11-magnetic steel group.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1 and 2, a silicon steel sheet with low stress magnetic isolation bridge, includes silicon steel sheet 1, sets up magnetic steel groove 2 on silicon steel sheet 1 and inlays the magnet steel subassembly of establishing in magnetic steel groove 2, and the magnet steel subassembly includes a plurality of magnet steel group 11, and magnet steel group 11 includes a pair of little permanent magnet 3 that is close to the rotor edge and a pair of big permanent magnet 4 that is close to the rotor inboard.
The pair of small permanent magnets 3 and the pair of large permanent magnets 4 are distributed in a splayed manner, the opening ends of the splayed shapes face the outer edge of the silicon steel sheet 1, and the symmetric axes of the pair of small permanent magnets 3 and the pair of large permanent magnets 4 are coincided with the d axis of the rotor.
The silicon steel sheet 1 is provided with a radial slot 5 extending from the edge to the center between two large permanent magnets 4 of adjacent magnetic steel groups 11. The radial slots 5 comprise a rectangular slot 6 and a circular slot 7 arranged at the end of the rectangular slot 6 facing the centre of the rotor. The direction in which the rectangular groove 6 extends in the radial direction is the length direction of the rectangular groove 6, and the long symmetry axis of the rectangular groove 6 coincides with the rotor q axis. The circular groove 7 is communicated with the rectangular groove 6, the center of the circular groove 7 is coincident with the rotor q-axis, and the diameter of the circular groove 7 is larger than the width of the rectangular groove 6.
And a magnetic isolation bridge 8 is arranged between the magnetic steel groove 2 and the outer edge of the silicon steel sheet 1. An air slot 9 is arranged at the end part of the magnetic steel slot 2, and a lightening hole 10 is arranged between the small permanent magnet 3 and the large permanent magnet 4. The two lightening holes 10 are symmetrically arranged, and the symmetry axis of the lightening holes 10 is superposed with the symmetry axes of the large permanent magnet and the small permanent magnet.
The depth of rectangular groove 6 and the radius of circular groove 7 are not limited to specific dimensions, and vary with stress requirements. In the embodiment, the depth of the radial slot 5 is 12% -16% of the radius of the rotor, wherein 14% is the best.
As shown in fig. 3, when the radial open groove 5 is not designed on the silicon steel sheet 1, the stresses of the magnetic isolation bridges 8 at the ends of the two permanent magnets are 212.15MPa and 421.52MPa respectively, as shown in fig. 4, after the radial open groove 5 is designed on the silicon steel sheet 1, the stresses of the magnetic isolation bridges 8 at the ends of the two permanent magnets are 153.76MPa and 399.19MPa respectively, and the stress at the magnetic isolation bridge 8 is significantly reduced.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (10)
1. The utility model provides a silicon steel sheet with low stress separates magnetic bridge, includes silicon steel sheet (1), sets up magnetic steel groove (2) on silicon steel sheet (1) and inlays and establish magnetic steel assembly in magnetic steel groove (2), magnetic steel assembly includes a plurality of magnet steel group (11), magnet steel group (11) are including a pair of little permanent magnet (3) that are close to the rotor edge and a pair of big permanent magnet (4) that are close to the rotor inboard, its characterized in that: the silicon steel sheet (1) is provided with a radial slot (5) extending from the edge to the center between two large permanent magnets (4) of adjacent magnetic steel groups (11).
2. The silicon steel sheet with low stress flux barriers as claimed in claim 1, wherein: the radial grooving (5) comprises a rectangular groove (6), the direction of the rectangular groove (6) extending along the radial direction is the length direction of the rectangular groove (6), and the long symmetry axis of the rectangular groove (6) is coincided with the q axis of the rotor.
3. The silicon steel sheet with low stress flux barriers according to claim 2, wherein: radial fluting (5) still includes circular slot (7), circular slot (7) set up in rectangular channel (6) towards the one end at rotor center, just circular slot (7) with rectangular channel (6) intercommunication, the center and the rotor q axle coincidence of circular slot (7).
4. The silicon steel sheet with low stress flux barriers according to claim 3, wherein: the diameter of the circular groove (7) is larger than the width of the rectangular groove (6).
5. The silicon steel sheet with low stress flux barriers as claimed in claim 1, wherein: and a magnetic isolation bridge (8) is arranged between the magnetic steel groove (2) and the outer edge of the silicon steel sheet (1).
6. The silicon steel sheet with low stress flux barriers as claimed in claim 1, wherein: and an air groove (9) is formed at the end part of the magnetic steel groove (2).
7. The silicon steel sheet with low stress flux barriers as claimed in claim 1, wherein: the pair of small permanent magnets (3) and the pair of large permanent magnets (4) are distributed in a splayed manner, the opening ends of the splayed shapes face the outer edge of the silicon steel sheet (1), and the symmetric axes of the pair of small permanent magnets (3) and the pair of large permanent magnets (4) are coincided with the d axis of the rotor.
8. The silicon steel sheet with low stress flux barriers as claimed in claim 1, wherein: the depth of the radial slot (5) is 12-16% of the radius of the rotor.
9. The utility model provides a motor rotor with low stress separates magnetic bridge, includes silicon steel sheet, its characterized in that: the silicon steel sheet is as defined in any one of claims 1 to 8.
10. An electric machine with low stress magnetic isolation bridge, includes electric machine rotor, its characterized in that: the rotor of an electric machine according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010508175.9A CN111585370A (en) | 2020-06-05 | 2020-06-05 | Silicon steel sheet with low-stress magnetic isolation bridge, motor rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010508175.9A CN111585370A (en) | 2020-06-05 | 2020-06-05 | Silicon steel sheet with low-stress magnetic isolation bridge, motor rotor and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111585370A true CN111585370A (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010508175.9A Pending CN111585370A (en) | 2020-06-05 | 2020-06-05 | Silicon steel sheet with low-stress magnetic isolation bridge, motor rotor and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111585370A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3029808A1 (en) * | 2013-10-31 | 2016-06-08 | Samsung Electronics Co., Ltd. | Magnet-embedded motor and compressor having magnet-embedded motor |
| CN205430015U (en) * | 2016-01-26 | 2016-08-03 | 华南理工大学 | Hybrid electric bus plays to employ permanent magnet reluctance motor |
| EP3163727A2 (en) * | 2015-10-06 | 2017-05-03 | Hamilton Sundstrand Corporation | Permanent magnet brushless motor with double squirrel cage |
| CN106787316A (en) * | 2016-12-22 | 2017-05-31 | 温岭市九洲电机制造有限公司 | A kind of lamination structure of magneto |
| JP2017118692A (en) * | 2015-12-24 | 2017-06-29 | アスモ株式会社 | Motor and method for adjusting magnetic flux of the same |
| CN209299013U (en) * | 2019-01-30 | 2019-08-23 | 合肥巨一动力系统有限公司 | A kind of high speed permanent magnet motor rotor punching |
| WO2019181001A1 (en) * | 2018-03-20 | 2019-09-26 | 株式会社 東芝 | Rotary electric machine |
| CN209526576U (en) * | 2018-10-29 | 2019-10-22 | 蔚来汽车有限公司 | Magneto and its rotor and rotor core |
-
2020
- 2020-06-05 CN CN202010508175.9A patent/CN111585370A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3029808A1 (en) * | 2013-10-31 | 2016-06-08 | Samsung Electronics Co., Ltd. | Magnet-embedded motor and compressor having magnet-embedded motor |
| EP3163727A2 (en) * | 2015-10-06 | 2017-05-03 | Hamilton Sundstrand Corporation | Permanent magnet brushless motor with double squirrel cage |
| JP2017118692A (en) * | 2015-12-24 | 2017-06-29 | アスモ株式会社 | Motor and method for adjusting magnetic flux of the same |
| CN205430015U (en) * | 2016-01-26 | 2016-08-03 | 华南理工大学 | Hybrid electric bus plays to employ permanent magnet reluctance motor |
| CN106787316A (en) * | 2016-12-22 | 2017-05-31 | 温岭市九洲电机制造有限公司 | A kind of lamination structure of magneto |
| WO2019181001A1 (en) * | 2018-03-20 | 2019-09-26 | 株式会社 東芝 | Rotary electric machine |
| CN209526576U (en) * | 2018-10-29 | 2019-10-22 | 蔚来汽车有限公司 | Magneto and its rotor and rotor core |
| CN209299013U (en) * | 2019-01-30 | 2019-08-23 | 合肥巨一动力系统有限公司 | A kind of high speed permanent magnet motor rotor punching |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20200825 |