CN213959836U - Stator core, stator assembly and low-cogging-torque permanent magnet synchronous motor - Google Patents
Stator core, stator assembly and low-cogging-torque permanent magnet synchronous motor Download PDFInfo
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- CN213959836U CN213959836U CN202022966482.XU CN202022966482U CN213959836U CN 213959836 U CN213959836 U CN 213959836U CN 202022966482 U CN202022966482 U CN 202022966482U CN 213959836 U CN213959836 U CN 213959836U
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 8
- 210000001624 hip Anatomy 0.000 claims description 8
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000005389 magnetism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The utility model provides a stator core, stator assembly and low tooth's socket torque's PMSM, stator core include stator body, stator body has the stator hole and encircles sixty stator slots of stator hole circumference evenly distributed, the stator slot is isosceles trapezoid groove. The stator assembly comprises a three-phase stator winding and the stator core, wherein the three-phase stator winding is arranged in sixty stator slots of the stator core. The permanent magnet synchronous motor with the low cogging torque comprises a rotor assembly and the stator assembly, the rotor assembly is arranged in an inner hole of the stator, and the rotor assembly comprises a rotor body and eight permanent magnets uniformly arranged in the circumferential direction of the outer wall of the rotor body in a surrounding mode. The utility model discloses a PMSM, sixty stator slot and eight permanent magnet equipartitions, 60/8's the effectual tooth's socket torque that has reduced PMSM's of polar groove cooperation is favorable to improving the torque fluctuation under the load, can improve PMSM control accuracy.
Description
Technical Field
The utility model belongs to the technical field of the motor, concretely relates to permanent magnet synchronous motor of low tooth's socket torque.
Background
The permanent magnet motor is widely applied to speed and position control systems, at present, a satellite momentum wheel and a reaction wheel are driven by the permanent magnet motor, particularly, a servo control system of a laser communication antenna requires the permanent magnet motor to have very low torque fluctuation, so that the control precision of the motor is improved, and the cogging torque is one of important influence factors of the torque fluctuation and can influence the running smoothness of the motor.
In a slotted permanent magnet motor, the cogging torque generated by the interaction between a permanent magnet and a slotted stator core affects the performance of a speed and position control system, so that it is very important to consider how to effectively reduce the cogging torque in the design of the permanent magnet motor.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the technical problem who exists among the prior art, the utility model discloses a first purpose provides a stator core aims at improving motor stator core's structure, reduces the tooth's socket torque of motor. A second object of the present invention is to provide a stator assembly having the aforementioned stator core. A third object of the present invention is to provide a permanent magnet synchronous motor with a low cogging torque of the aforementioned stator assembly.
In order to achieve the first objective, the utility model adopts the following technical scheme: a stator core comprises a stator body, wherein the stator body is provided with a stator inner hole and sixty stator slots which are uniformly distributed in the circumferential direction of the stator inner hole in a surrounding mode, and the stator slots are of a structure which is expanded from outside to inside and is wide in outside and narrow in inside.
In the technical scheme, the stator core is provided with sixty stator slots, and the number of the stator slots is proper, so that the cogging torque is reduced, and the torque fluctuation of the motor under load is improved; and the stator slot is punched and expanded from outside to inside to form a structure with wide outside and narrow inside, so that copper wires can be conveniently inserted.
In a preferred embodiment of the invention, the stator slot has a stator slot opening communicating with the stator bore.
In a preferred embodiment of the present invention, the stator slot has an isosceles trapezoid structure with a wide outer part and a narrow inner part; and/or the stator notch is in an isosceles trapezoid structure with an outer width and an inner width.
In a preferred embodiment of the present invention, the included angle between the two waists of the stator slot is 2.9 to 3.79 degrees; and/or the included angle of two waists of the stator notch is 0-2.6 degrees.
In order to achieve the second purpose, the utility model adopts the following technical scheme: a stator assembly comprises three-phase stator windings and the stator core, wherein the three-phase stator windings are arranged in sixty stator slots of the stator core.
In order to achieve the third purpose, the utility model adopts the following technical scheme: the permanent magnet synchronous motor with the low cogging torque comprises a rotor assembly and the stator assembly, wherein the rotor assembly is arranged in a stator inner hole, the rotor assembly comprises a rotor body and a plurality of permanent magnets which are uniformly arranged around the outer wall of the rotor body in the circumferential direction, and an air gap is formed between each permanent magnet and the inner wall of the stator inner hole.
In a preferred embodiment of the present invention, the outer diameter of the stator body is 100mm to 216mm, the diameter of the stator inner hole is 61.8mm to 133.5mm, the radial length of the stator groove is 8.8mm to 19mm, the circumferential width of the stator groove is 2.36mm to 5.1mm, the stator tooth thickness is 0.45mm to 0.96mm, and the outer diameter of the rotor body is 54.8mm to 126.4 mm.
The utility model discloses an in the preferred embodiment, the permanent magnet is the radial structure of magnetizing of tile form, and the thickness of permanent magnet is 3mm ~ 4mm, and the polar arc coefficient is 0.75.
In another preferred embodiment of the present invention, the width of the air gap is 0.5mm to 1 mm. The larger the air gap is, the smaller the cogging torque is, but the large air gap can reduce the torque output capacity of the motor, and the width of the air gap is more reasonable from 0.5mm to 1 mm.
Compared with the prior art, the utility model discloses a permanent magnet synchronous motor of low tooth's socket torque beneficial effect as follows: sixty stator slots and eight permanent magnets are uniformly distributed, and 60/8 pole slots are matched to effectively reduce the cogging torque of the permanent magnet synchronous motor, so that the torque fluctuation of the permanent magnet synchronous motor under load can be improved, and the control precision of the permanent magnet synchronous motor can be improved.
In another preferred embodiment of the present invention, the number of permanent magnets is eight.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a stator core according to a first embodiment of the present application.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic structural diagram of a low cogging torque permanent magnet synchronous motor according to a third embodiment of the present application.
Fig. 4 is a partially enlarged view of fig. 3 at B.
Fig. 5 is a radial air gap flux density harmonic comparison plot for a 60 slot 8 pole machine versus a 48 slot 8 pole machine.
Fig. 6 is a cogging torque comparison of a 60 slot 8 pole machine versus a 48 slot 8 pole machine.
Reference numerals in the drawings of the specification include: stator body 11, stator inner hole 12, stator slot 13, stator notch 14, rotor body 21, permanent magnet 22, and included angle theta between two waists of stator slot1Angle theta between two waists of stator slot2Thickness H of permanent magnetMAir gap Ha。
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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Example one
The present embodiment provides a stator core, as shown in fig. 1 and 2, which in a preferred embodiment includes a stator body 11, the stator body 11 having a stator bore 12 and being circumferentially evenly spaced around the stator bore 12Sixty stator slots 13 are arranged, and the stator slots 13 are of structures which are expanded from outside to inside and have wide outside and narrow inside. Preferably, the stator slot 13 is an isosceles trapezoid structure with a wide outer part and a narrow inner part, the surfaces of the stator slot bottom, the stator tooth part facing the slot inner part and the stator inner hole 12 are all arc-shaped, and the arc radiuses are distances from the surface to the circle center of the outer diameter of the stator body 11. Preferably, the included angle theta between two waists of the stator slot 131Is 2.9-3.79 degrees, and more preferably, two sides (namely two waists of the isosceles trapezoid groove) of the stator groove 13 extend and then intersect at the center of the stator inner hole 12.
Wherein, stator slot 13 has stator notch 14 with stator hole 12 intercommunication, and stator notch 14 is the isosceles trapezoid structure of outer wide narrow inside, and the contained angle theta of two waists of preferred stator notch2Is 0 to 2.6 degrees, namely the stator notch 14 is a closed slot or a small opening slot width structure, and more preferably, two side edges of the stator notch 14 are also intersected at the center of the stator inner hole 12 after extending.
Example two
The present embodiment provides a stator assembly including a three-phase stator winding and the stator core of the first embodiment, the three-phase stator winding being disposed in sixty stator slots 13 of the stator core.
EXAMPLE III
The embodiment provides a low-cogging-torque permanent magnet synchronous motor, as shown in fig. 3 and 4, in a preferred embodiment, the motor includes a rotor assembly and a stator assembly of the second embodiment, the rotor assembly is installed in a stator inner hole 12, the rotor assembly includes a rotor body 21 and a plurality of permanent magnets 22 uniformly arranged in the circumferential direction around the outer wall of the rotor body 21, the rotor body 21 and the stator body 11 are coaxially arranged, the permanent magnets 22 are fixedly connected to the outer wall of the rotor body 21, and an air gap H is formed between the permanent magnets 22 and the inner wall of the stator inner hole 12a。
In the present embodiment, it is preferable that the number of the permanent magnets 22 is eight, the permanent magnets 22 have a tile-shaped radial magnetizing structure, and the thickness H of the permanent magnets M3 mm-4 mm and uniform thickness, the pole arc coefficient is 0.75 degrees, and the width of the air gap Ha is 0.5 mm-1 mm.
In the present embodiment, it is preferable that the outer diameter of the stator body 11 is 100mm to 216mm, the diameter of the stator inner hole 12 is 61.8mm to 133.5mm, the radial length of the stator slot 13 (the distance between the middle points of the two opposite sides of the isosceles trapezoid) is 8.8mm to 19mm, the circumferential width of the stator slot 13 (the distance between the middle points of the two sides of the isosceles trapezoid) is 2.36mm to 5.1mm, the stator tooth thickness is 0.45mm to 0.96mm, and the outer diameter of the rotor body 21 is 54.8mm to 126.4 mm. In practice, the minimum and maximum dimensions are scaled up. As shown in fig. 5, guaranteeing that the silicon steel sheet quantity is the same, under the unchangeable condition of other topological structure parameters, will the utility model discloses a 60 groove 8 utmost point motors contrast with traditional 48 groove 8 utmost point motor performances, and both radial air gap magnetism density low order harmonic amplitude differ very little, nevertheless the utility model discloses a 60 groove 8 utmost point motors radial air gap magnetism density's high order harmonic amplitude then obviously is less than 48 groove 8 utmost point motors, and air gap magnetism density is more sinusoidal.
As shown in fig. 5, the cogging torque peak value of the 60-slot 8-pole motor of the present invention is 0.32N · m, which is much smaller than the cogging torque peak value of the conventional 48-slot 8-pole motor of 18.03N · m, and the torque ripple of the permanent magnet synchronous motor of the present invention is smaller.
In the description herein, reference to the description of the terms "preferred embodiment," "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The stator core is characterized by comprising a stator body, wherein the stator body is provided with a stator inner hole and sixty stator slots which are uniformly distributed in the circumferential direction of the stator inner hole in a surrounding mode, the stator slots are of an isosceles trapezoid structure which is expanded from outside to inside and is wide in outer part and narrow in inner part, and the included angle between two waists of each stator slot is 2.9-3.79 degrees.
2. A stator core according to claim 1 wherein the stator slots have stator slots communicating with the stator bore.
3. A stator core according to claim 2 wherein the stator slots are isosceles trapezoids having an outer width and an inner width.
4. A stator core according to claim 3, wherein the angle between the two legs of the stator slot is 0 ° to 2.6 °.
5. A stator assembly comprising a three-phase stator winding and the stator core of any one of claims 1-4, the three-phase stator winding being disposed within sixty stator slots of the stator core.
6. A permanent magnet synchronous motor with low cogging torque is characterized by comprising a rotor assembly and the stator assembly of claim 5, wherein the rotor assembly is installed in a stator inner hole, the rotor assembly comprises a rotor body and a plurality of permanent magnets uniformly arranged in the circumferential direction of the outer wall of the rotor body in a surrounding mode, and an air gap is formed between each permanent magnet and the inner wall of the stator inner hole.
7. The low cogging torque permanent magnet synchronous motor of claim 6, wherein the outer diameter of the stator body is 100mm to 216mm, the diameter of the inner bore of the stator is 61.8mm to 133.5mm, the radial length of the stator slot is 8.8mm to 19mm, the circumferential width of the stator slot is 2.36mm to 5.1mm, the tooth thickness of the stator is 0.45mm to 0.96mm, and the outer diameter of the rotor body is 54.8mm to 126.4 mm.
8. The low cogging torque permanent magnet synchronous motor of claim 6, wherein the permanent magnets are tile-shaped radial magnetizing structures, the thickness of each permanent magnet is 3mm to 4mm, and the pole arc coefficient is 0.75 °.
9. The low cogging torque PMSM of claim 6, wherein the width of the air gap is 0.5 mm-1 mm.
10. A low cogging torque permanent magnet synchronous motor according to any one of claims 6-9, wherein the number of permanent magnets is eight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022966482.XU CN213959836U (en) | 2020-12-10 | 2020-12-10 | Stator core, stator assembly and low-cogging-torque permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022966482.XU CN213959836U (en) | 2020-12-10 | 2020-12-10 | Stator core, stator assembly and low-cogging-torque permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213959836U true CN213959836U (en) | 2021-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022966482.XU Active CN213959836U (en) | 2020-12-10 | 2020-12-10 | Stator core, stator assembly and low-cogging-torque permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213959836U (en) |
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2020
- 2020-12-10 CN CN202022966482.XU patent/CN213959836U/en active Active
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Address after: 401123 39-1, Building 1, No. 64, Middle Huangshan Avenue, Yubei District, Chongqing Patentee after: China Star Network Application Co.,Ltd. Address before: 618 Liangjiang Avenue, Longxing Town, Yubei District, Chongqing Patentee before: Dongfanghong Satellite Mobile Communication Co.,Ltd. |
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