CN216122115U - Automobile brushless motor rotor position sensor structure - Google Patents
Automobile brushless motor rotor position sensor structure Download PDFInfo
- Publication number
- CN216122115U CN216122115U CN202121996609.0U CN202121996609U CN216122115U CN 216122115 U CN216122115 U CN 216122115U CN 202121996609 U CN202121996609 U CN 202121996609U CN 216122115 U CN216122115 U CN 216122115U
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- CN
- China
- Prior art keywords
- magnetic steel
- position sensor
- sensor structure
- brushless motor
- rotor position
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 109
- 239000010959 steel Substances 0.000 claims abstract description 109
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 238000004663 powder metallurgy Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Abstract
The utility model discloses a position sensor structure of an automobile brushless motor rotor, which comprises a motor shaft, a magnetic steel bracket sleeved on the periphery of the motor shaft and magnetic steel sleeved on the periphery of the magnetic steel bracket; the magnetic steel bracket is axially divided into a fixing section and a spacing section, the fixing section is in interference fit with the motor shaft, and the spacing section is in clearance fit with the motor shaft; the periphery of the spacing section is provided with concave-convex textures, and the magnetic steel is injected on the periphery of the spacing section so that the inner surface of the magnetic steel forms a concave-convex structure meshed with the concave-convex textures of the spacing section. The automobile brushless motor rotor position sensor structure has the advantages of compact structure, small volume, convenience in installation, high reliability and the like. The magnetic steel and the magnetic steel bracket are connected into a whole through injection molding, and are tightly combined through concave-convex textures at the combining part, so that the magnetic steel bracket can bear larger centrifugal force and vibration without loosening.
Description
Technical Field
The utility model relates to the technical field of motor design, in particular to a rotor position sensor structure of an automobile brushless motor, which is mainly used for new energy automobiles, fuel automobiles and hybrid automobiles.
Background
The brushless motor for the new energy automobile requires low voltage, large torque, small volume and light weight of the motor. Therefore, the motor is required to have compact structure, small volume, high strength, good reliability and impact shock resistance. Install the magnet steel on the motor shaft usually for with hall sensor cooperation make the motor zero, prior art has following defect: (1) generally, a motor shaft is a cylinder, a magnetic steel bracket is provided with no spacing section, the height of the magnetic steel bracket is equal to that of the magnetic steel, and the magnetic steel bracket is made to be very thick and solid, so that the magnetic steel is prevented from cracking during press mounting, but the whole structure is large in size and heavy in weight; (2) usually with the motor shaft design for the step shaft form to fix magnet steel bracket and magnet steel on the different axle sections of step shaft in proper order, can lead to the mounted position of magnet steel limited like this, be unfavorable for the miniaturized design of motor, and because the material of magnet steel is different with magnet steel bracket and motor shaft, under long-term vibration and high low temperature situation, the magnet steel takes off very easily, for this reason, how to design a compact structure, the better position sensor structure of shock resistance and vibration ability is the technical problem that needs to solve at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a rotor position sensor structure of an automobile brushless motor, which aims to solve the technical problems that in the prior art, a magnetic steel bracket of the brushless motor has no spacing section, and the overall size and mass are increased due to the fact that the magnetic steel bracket is very thick and solid to avoid magnetic steel cracking.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a rotor position sensor structure of an automobile brushless motor comprises a motor shaft, a magnetic steel bracket sleeved on the periphery of the motor shaft and magnetic steel sleeved on the periphery of the magnetic steel bracket; the magnetic steel bracket is axially divided into a fixing section and a spacing section, the fixing section is in interference fit with the motor shaft, and the spacing section is in clearance fit with the motor shaft; the periphery of the spacing section is provided with concave-convex textures, and the magnetic steel is injected on the periphery of the spacing section so that the inner surface of the magnetic steel forms a concave-convex structure meshed with the concave-convex textures of the spacing section.
Further, the concave-convex texture is a knurl or a spiral groove.
Furthermore, the magnetic steel bracket is made of steel, copper, aluminum or powder metallurgy.
Furthermore, the magnetic steel bracket is formed by machining or die.
Furthermore, the magnetic steel is made of a mixture of neodymium iron boron and resin.
Further, the motor shaft is a cylinder with the same diameter.
Furthermore, the periphery of the spacing section is provided with an annular groove which is recessed inwards in the radial direction, and the annular groove is axially positioned between the magnetic steel and the fixing section.
Furthermore, the number of pole pairs of the magnetic steel is two to five.
Furthermore, the number of pole pairs of the magnetic steel is four.
Furthermore, the wall thickness of the magnetic steel bracket positioned at the spacing section is 0.5-3.5 mm.
The utility model has the beneficial effects that:
(1) the automobile brushless motor rotor position sensor structure has the advantages of compact structure, small volume, convenience in installation, high reliability and the like. The magnetic steel and the magnetic steel bracket are connected into a whole through injection molding, and are tightly combined through concave-convex textures at the combining part, so that the magnetic steel bracket can bear larger centrifugal force and vibration without loosening.
(2) According to the automobile brushless motor rotor position sensor structure, the magnetic steel bracket is divided into two sections, and the spacing section provided with the magnetic steel is in clearance fit with a motor shaft, so that the magnetic steel bracket is prevented from expanding outwards to crack the magnetic steel in an interference manner.
(3) According to the rotor position sensor structure of the automobile brushless motor, the annular groove which is separated between the fixing section and the magnetic steel is formed in the periphery of the magnetic steel bracket, so that interference stress on the fixing section is prevented from being released to the magnetic steel.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a front view of an embodiment of an automotive brushless motor rotor position sensor configuration according to the present invention;
fig. 2 is a schematic view of the magnetic pole distribution of the magnetic steel in the utility model.
In the figure, the motor shaft 1, the motor shaft 2, the magnetic steel bracket 201, the fixing section 202, the spacing section 3, the magnetic steel 4, the concave-convex texture 5 and the annular groove are arranged.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In a specific embodiment of the present invention, as shown in fig. 1, an automotive brushless motor rotor position sensor structure includes a motor shaft 1, a magnetic steel bracket 2 and magnetic steel 3, wherein the motor shaft 1 is a cylindrical structure with an equal diameter, the magnetic steel bracket 2 is an annular cylinder and is sleeved on the periphery of the motor shaft 1, the magnetic steel 3 is also an annular cylinder and has an axial length smaller than that of the magnetic steel bracket 2, and the magnetic steel 3 is sleeved on the periphery of the magnetic steel bracket 2; motor shaft 1, magnet steel bracket 2, magnet steel 3 are whole to be fixed knot structure, and the synchronous revolution of during operation three, and magnet steel bracket 2 is as motor shaft 1 and magnet steel 3's intermediate junction spare for improve magnet steel 3's fixed strength and avoid magnet steel 3 to receive interference stress. The motor shaft 1 and the magnetic steel bracket 2 are usually made of metal, such as steel, copper, aluminum or powder metallurgy. The magnetic steel 3 has magnetism and is usually made of a mixture of neodymium iron boron and resin. Because motor shaft 1 is the cylinder structure of isodiametric, consequently magnet steel bracket 2 can set up the optional position on motor shaft 1, provides the selection of more mounted positions.
The periphery of the spacing section 202 is provided with concave-convex textures 4, and the magnetic steel 3 is injected on the periphery of the spacing section 202, so that the inner surface of the magnetic steel 3 forms a concave-convex structure meshed with the concave-convex textures 4 of the spacing section 202. Because magnet steel 3 and magnet steel bracket 2 adopt different materials to make, even magnet steel 3 and magnet steel bracket 2 have moulded plastics as an organic whole, it is great at centrifugal force, perhaps under long-term vibration and high low temperature situation, magnet steel 3 still can loosen with magnet steel bracket 2, set up after intermeshing's unsmooth texture 4 and concave-convex structure, can offset circumference and axial stress between magnet steel 3 and the magnet steel bracket 2, avoid both circular rotation and axial displacement, can bear great centrifugal force and vibration and do not have the pine and take off. The meshing means that the concave-convex texture 4 and the concave-convex structure are relatively matched and filled, so that no gap exists between the magnetic steel 3 and the magnetic steel bracket 2. The relief texture 4 may be a knurl or a spiral groove.
Taking concave-convex texture 4 as a knurl as an example, when processing, firstly, a magnetic steel bracket 2 with knurls on the periphery is processed by adopting a machining or die forming mode, then, the magnetic steel 3 and the magnetic steel 3 are injected together, the magnetic steel bracket 2 is wrapped by the magnet when the magnet is injected, and the knurl texture can be naturally formed by filling.
Since the fixed segment 201 is subjected to an external expansion stress of interference fit, the external expansion stress is gradually released to the hollow segment 202 connected to the fixed segment 201, so as to affect the magnetic steel 3, for this reason, in a further design of the present invention, the periphery of the hollow segment 202 has an annular groove 5 recessed radially inward, and the annular groove 5 is axially located between the magnetic steel 3 and the fixed segment 201. The annular groove 5 can release the bulging-out stress on the fixing section 201, and the magnetic steel 3 is prevented from being cracked due to the influence of the bulging-out stress.
For the magnetic design of the magnetic steel 3, the magnetic steel 3 is magnetized into four pairs of poles, as shown in fig. 2, and the magnetic performance data after magnetization is (20 ℃): br is more than or equal to 0.5T, and Hcb is more than or equal to 300 kA/m; hcj is more than or equal to 800kA/m (wherein Br is remanence, Hcb is coercive force, and Hcj is intrinsic coercive force). Therefore, the magnetic steel 3 with four pairs of poles has stronger magnetism, and can realize magnetic induction at a remote position.
In the description of the present invention, it is to be understood that the terms "inner", "outer", "axial", "radial", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be construed as limiting the present invention.
In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides an automobile brushless motor rotor position sensor structure which characterized in that: comprises a motor shaft (1), a magnetic steel bracket (2) sleeved on the periphery of the motor shaft (1) and magnetic steel (3) sleeved on the periphery of the magnetic steel bracket (2);
the magnetic steel bracket (2) is axially divided into a fixed section (201) and a hollow section (202), the fixed section (201) is in interference fit with the motor shaft (1), and the hollow section (202) is in clearance fit with the motor shaft (1);
the periphery of the spacing section (202) is provided with concave-convex textures (4), and the magnetic steel (3) is injected on the periphery of the spacing section (202) so that the inner surface of the magnetic steel (3) forms a concave-convex structure meshed with the concave-convex textures (4) of the spacing section (202).
2. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the concave-convex texture (4) is a knurl or a spiral groove.
3. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the magnetic steel bracket (2) is made of steel, copper, aluminum or powder metallurgy.
4. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the magnetic steel bracket (2) is formed by machining or die.
5. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the magnetic steel (3) is made of a mixture of neodymium iron boron and resin.
6. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the motor shaft (1) is a cylinder with the same diameter.
7. The automotive brushless motor rotor position sensor structure according to any one of claims 1 to 6, characterized in that: the periphery of the spacing section (202) is provided with a radial inward-recessed annular groove (5), and the annular groove (5) is axially positioned between the magnetic steel (3) and the fixing section (201).
8. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the number of pole pairs of the magnetic steel (3) is two to five.
9. The automotive brushless motor rotor position sensor structure of claim 8, wherein: the number of pole pairs of the magnetic steel (3) is four.
10. The automotive brushless motor rotor position sensor structure of claim 1, wherein: the wall thickness of the magnetic steel bracket (2) positioned at the spacing section (202) is 0.5mm-3.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121996609.0U CN216122115U (en) | 2021-08-24 | 2021-08-24 | Automobile brushless motor rotor position sensor structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121996609.0U CN216122115U (en) | 2021-08-24 | 2021-08-24 | Automobile brushless motor rotor position sensor structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216122115U true CN216122115U (en) | 2022-03-22 |
Family
ID=80728236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121996609.0U Active CN216122115U (en) | 2021-08-24 | 2021-08-24 | Automobile brushless motor rotor position sensor structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216122115U (en) |
-
2021
- 2021-08-24 CN CN202121996609.0U patent/CN216122115U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 266, Fumin Road, Lucheng Street, Wujin District, Changzhou City, Jiangsu Province, 213000 Patentee after: Nedco Kaiyu Automotive Appliances (Jiangsu) Co.,Ltd. Address before: 213000 No. 156 Dongfang East Road, Changzhou City, Jiangsu Province Patentee before: NIDEC KAIYU AUTO ELECTRIC (JIANGSU) Co.,Ltd. |
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| CP03 | Change of name, title or address |