CN211701649U - High-power-density permanent magnet synchronous motor rotor for driving new energy automobile and punching sheet thereof - Google Patents
High-power-density permanent magnet synchronous motor rotor for driving new energy automobile and punching sheet thereof Download PDFInfo
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- CN211701649U CN211701649U CN202020363588.8U CN202020363588U CN211701649U CN 211701649 U CN211701649 U CN 211701649U CN 202020363588 U CN202020363588 U CN 202020363588U CN 211701649 U CN211701649 U CN 211701649U
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Abstract
The utility model provides a new energy automobile drive is with high power density PMSM rotor includes: the punching sheet is provided with a motor shaft hole positioned in the center, lightening holes circumferentially arranged around the motor shaft hole and a magnetic steel groove group, and the magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove; and the first magnetic steel and the second magnetic steel are correspondingly arranged in the first magnetic steel groove and the second magnetic steel groove respectively, the cross section of the second magnetic steel has a structure that upper and lower rectangular long edges are modified into upper and lower arc-shaped edges, the upper arc-shaped edge and the lower arc-shaped edge are bent towards the direction far away from the center of the punching sheet, the first magnetic steel is closer to the center of the punching sheet than the second magnetic steel, the shapes of the first magnetic steel and the second magnetic steel are respectively adaptive to the shapes of the first magnetic steel groove and the second magnetic steel groove, and the second magnetic steel has the width limited by the two rectangular short edges. The punching sheet included by the rotor is also provided. The utility model discloses the atress of whole rotor including magnetic bridge when having reduced high-speed rotation can promote power density.
Description
Technical Field
The utility model relates to a new energy automobile drive is with high power density PMSM rotor and towards piece, especially a high power density PMSM rotor for new energy automobile motor belongs to new energy variable frequency speed governing PMSM field.
Background
At present, with the integrated development of a power system of a new energy passenger vehicle, the requirements on a driving motor used by the new energy passenger vehicle, namely a permanent magnet synchronous motor, are higher and higher, and the requirements are mainly expressed in the aspects of high rotating speed and high power density. Pursuit high rotational speed and must bring the motor power density reduction of the same volume, the automobile-used high rotational speed PMSM rotor magnet steel mounting means of new forms of energy that adopts at present mainly is embedded, and rotor core is riveted by rotor punching stack and forms, and in the permanent magnet embedding rotor core magnet steel groove, the magnetic steel groove and the magnetic isolation bridge of rotor core excircle structurally act as the function of rotor sheath, and the protection rotor can not lead to the atress too big rotor chamber of sweeping because of the centrifugal force of magnet steel when high-speed.
For example, chinese patent with publication number CN206412854U discloses a permanent magnet synchronous motor rotor and punching sheet, in which the magnetic steel embedded in the magnetic steel slot of the motor rotor punching sheet is a rectangular permanent magnet, but when the rotor runs at high speed, especially at high rotation speed of 12000rpm-18000rpm required by passenger cars, the square magnetic steel slot increases the stress of the rotor under the action of high-speed centrifugal force of the magnetic steel, which easily causes the magnetic isolation bridge between the magnetic steel slot and the rotor punching sheet to be pulled apart, thereby causing the rotor to sweep the bore and causing motor failure. Therefore, the size of the magnetic isolation bridge needs to be widened to increase the strength of the rotor, but as the size of the magnetic isolation bridge is widened, the leakage flux of the permanent magnet is increased, the motor output is reduced in a limited motor size, and the motor power density is reduced. That is, the higher the rotation speed, the lower the power density for the same motor size, causing a contradiction between rotation speed and power density.
In view of the above, the present invention is directed to a high power density permanent magnet synchronous motor rotor for driving a new energy vehicle, so as to solve one or more of the above technical problems.
SUMMERY OF THE UTILITY MODEL
In order to solve one or more technical problem among the prior art, according to the utility model discloses an aspect provides a new energy automobile drives with high power density PMSM rotor, its characterized in that includes:
the punching sheet is provided with a motor shaft hole positioned in the center, lightening holes circumferentially arranged around the motor shaft hole and a magnetic steel groove group, and the magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove; and
the first magnetic steel and the second magnetic steel are correspondingly arranged in the first magnetic steel groove and the second magnetic steel groove respectively, the cross section of the second magnetic steel has a structure that upper and lower rectangular long edges are modified into upper and lower arc-shaped edges, the upper arc-shaped edge and the lower arc-shaped edge are bent towards the direction far away from the center of the punching sheet, the first magnetic steel is closer to the center of the punching sheet than the second magnetic steel, the shapes of the first magnetic steel and the second magnetic steel are respectively adaptive to the shapes of the first magnetic steel groove and the second magnetic steel groove, and the second magnetic steel has the width limited by the two rectangular short edges.
According to another aspect of the present invention, the cross section of the first magnetic steel has a structure in which two long sides of the rectangle are modified into upper and lower arc sides, the first magnetic steel groove and the second magnetic steel groove are arranged in parallel, and the first magnetic steel groove is longer than and wider than the second magnetic steel groove; or the cross section of the first magnetic steel has a rectangular structure, and the first magnetic steel groove is longer than and wider than the second magnetic steel groove.
According to the utility model discloses in another aspect, the magnet steel slot group still includes first to fourth air groove, and first magnet steel slot, first air groove, second magnet steel slot, third air groove, fourth air groove are arranged according to clockwise in proper order, and second air groove and third air groove are close to the both ends in second magnet steel slot respectively.
According to the utility model discloses in another aspect, form first magnetism bridge that separates between first magnetic steel groove and the first air groove, first air groove forms the second magnetism bridge that separates with towards between the outward flange of piece, forms the third magnetism bridge that separates between the first end of second magnetic steel groove and the outward flange of piece, forms the fourth magnetism bridge that separates between the second end of second magnetic steel groove and the outward flange of piece, forms the fifth magnetism bridge that separates between the outward flange of fourth air groove and piece, forms the sixth magnetism bridge that separates between fourth air groove and the first magnetic steel groove.
According to the utility model discloses in another aspect, the lightening hole is corresponding with the quantity of magnet steel groove group.
According to the utility model discloses in another aspect, the quantity of magnet steel groove group is a plurality of, and a plurality of magnet steel groove groups set up along the outward flange circumference towards the piece.
According to the utility model discloses in another aspect, it is circular to dash the piece, second magnet steel groove sets up along the outward flange towards the piece.
According to the utility model discloses in another aspect, first air groove is along the first radial setting towards the piece, fourth air groove is along the radial setting towards the second of piece.
According to the present invention, the first magnetic steel groove, the first air groove, the second magnetic steel groove, the third air groove, and the fourth air groove are arranged in an approximate quadrangle.
According to the utility model discloses in another aspect, still provide one kind according to the towards piece that aforementioned new energy automobile drive included with high power density PMSM rotor.
Compared with the prior art, the utility model discloses one or more technical effect below having:
1) through the design of the magnetic steel groove and the arc-shaped edge of the magnetic steel, the stress strength of the magnetic isolation bridge is reduced when the rotor rotates at a high speed;
2) the design of the arc-shaped edge of the magnetic steel changes the stress direction of the rotor magnetic steel slot, reduces the stress borne by the rotor, meets the requirement that the stress borne by the rotor is smaller than the yield strength of the rotor, and can meet the safety requirement;
3) under the condition of meeting the requirement that the stress borne by the rotor is smaller than the yield strength of the rotor, the width of the magnetic steel can be further increased so as to enhance the magnetic field strength and increase the motor output so as to improve the power density of the motor;
4) considering both electromagnetic and mechanical requirements, a sufficiently strong rotating magnetic field can be provided, and at the same time, the huge centrifugal force generated by high-speed rotation can be borne.
Drawings
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments. The accompanying drawings relate to preferred embodiments of the present invention and are described below:
fig. 1 is a schematic structural diagram of a high power density permanent magnet synchronous motor rotor for driving a new energy vehicle according to a preferred embodiment of the present invention;
fig. 2 is a partially enlarged schematic view of a rotor of the high power density permanent magnet synchronous motor for driving the new energy automobile in fig. 1;
FIG. 3 is a stress distribution diagram of a PMSM rotor (rectangular magnetic steel and rectangular magnetic steel slots) at high rotational speed in the prior art;
fig. 4 is a stress distribution diagram of the high power density permanent magnet synchronous motor rotor for driving the new energy automobile at a high rotation speed according to the utility model;
fig. 5 is a perspective view of a first magnetic steel (lower) and a second magnetic steel (upper) used by the high-power-density permanent magnet synchronous motor rotor for driving the new energy automobile in fig. 1.
Detailed Description
Reference will now be made in detail to the various embodiments, one or more examples of which are illustrated in each figure. The examples are provided by way of explanation and are not meant as limitations. For example, features illustrated or described as part of one embodiment can be used on or in conjunction with any other embodiment to yield yet a further embodiment. The present invention is intended to embrace such modifications and variations.
In the following description of the drawings, like reference numerals designate identical or similar structures. Generally, only the differences between the individual embodiments will be described. Descriptions of parts or aspects in one embodiment can also be applied to corresponding parts or aspects in another embodiment, unless explicitly stated otherwise.
Referring to fig. 1-2, according to a preferred embodiment of the present invention, there is provided a high power density permanent magnet synchronous motor rotor for driving a new energy vehicle, including:
the punching sheet is provided with a motor shaft hole 1 positioned in the center, lightening holes 2 arranged around the circumference of the motor shaft hole 1 and a magnetic steel slot group, wherein the magnetic steel slot group comprises a first magnetic steel slot 4 and a second magnetic steel slot 3; and
It should be noted that, the cross section of the first magnetic steel 6 and the second magnetic steel 5 in the present invention refers to a cross section cut along the radial direction of the punching sheet in fig. 1. It will be appreciated that, for example, with reference to fig. 5, the first magnetic steel 6 and the second magnetic steel 5 have a certain thickness in a direction perpendicular to the section.
According to the utility model discloses still another preferred embodiment, see fig. 1, the cross-section of first magnet steel 6 has the structure of two long limit retrofits for upper and lower arc limit about rectangular, but is not limited to this, and the cross-section of first magnet steel 6 still can be the rectangle, and first magnet steel 6 and first magnet steel groove 4 are the cuboid structure promptly. The first magnetic steel groove 4 and the second magnetic steel groove 3 can be arranged in parallel, and the first magnetic steel groove 4 is longer than and wider than the second magnetic steel groove 3.
According to the utility model discloses still another preferred embodiment, the magnet steel slot group still includes first to fourth air groove, and first magnet steel slot 4, first air groove 9, second air groove 7, second magnet steel slot 3, third air groove 8, fourth air groove 10 are arranged according to clockwise in proper order, and second air groove 7 and third air groove 8 are close to the both ends of second magnet steel slot 3 respectively.
According to another preferred embodiment of the present invention, referring to fig. 2, a first magnetic isolation bridge 100 is formed between the first magnetic steel slot 4 and the first air slot 9, a second magnetic isolation bridge 33 is formed between the first air slot 9 and the outer edge of the punching sheet, a third magnetic isolation bridge 55 is formed between the first end of the second magnetic steel slot 3 and the outer edge of the punching sheet, a fourth magnetic isolation bridge 56 is formed between the second end of the second magnetic steel slot 3 and the outer edge of the punching sheet, a fifth magnetic isolation bridge 34 is formed between the fourth air slot 10 and the outer edge of the punching sheet, and a sixth magnetic isolation bridge 101 is formed between the fourth air slot 10 and the first magnetic steel slot 4. The magnetic isolation effect can be further improved by the magnetic isolation bridges.
According to the utility model discloses still another preferred embodiment, lightening hole 2 is corresponding with the quantity of magnet steel groove group.
According to the utility model discloses still another preferred embodiment, the quantity of magnet steel groove group is a plurality of, and a plurality of magnet steel groove groups set up along the outward flange circumference towards the piece.
According to the utility model discloses still another preferred embodiment, it is circular to dash the piece, second magnetic steel groove 3 sets up along the outward flange towards the piece.
According to another preferred embodiment of the present invention, referring to fig. 1, the first air slots 9 are arranged along a first radial direction of the sheet, and the fourth air slots 10 are arranged along a second radial direction of the sheet.
According to another preferred embodiment of the present invention, referring to fig. 1, the first magnetic steel slot 4, the first air slot 9, the second air slot 7, the second magnetic steel slot 3, the third air slot 8 and the fourth air slot 10 are arranged in an approximate quadrangle. The first magnetic steel 6 has an increased width.
According to the utility model discloses still another preferred embodiment, still provide a towards piece that includes according to aforementioned new energy automobile drive with high power density PMSM rotor. For example, this punching sheet includes the body, is provided with the motor shaft hole that is located the center on this body, the lightening hole and the magnet steel slot group that set up around motor shaft hole circumference, the magnet steel slot group includes first magnet steel slot and second magnet steel slot, and the cross-section of second magnet steel slot has the structure of reforming rectangular two upper and lower long limits into upper and lower arc limit, goes up arc limit and lower arc limit towards the direction bending of keeping away from the punching sheet center, and first magnet steel slot is closer to the punching sheet center than second magnet steel slot, and the shape in first magnet steel slot and second magnet steel slot suits with the shape of first magnet steel and second magnet steel respectively, and second magnet steel slot has by the width that two rectangular minor faces were injectd.
According to the utility model discloses still another preferred embodiment, still provide a built-in PMSM rotor and towards piece. The built-in permanent magnet synchronous motor rotor comprises a punching sheet and magnetic steel. The punching sheets form a rotor core. The punching sheet is characterized in that a motor shaft hole 1 is formed in the center of the punching sheet, lightening holes 2, a magnetic steel groove group and magnetic steel are uniformly distributed according to the number of poles of the motor by taking the center of the motor shaft hole as the center, the magnetic steel groove group consists of a large magnetic steel groove 4, a small magnetic steel groove 3, large air grooves 9 and 10 and small air grooves 7 and 8 which are parallel to each other, and the large magnetic steel 6 and the small magnetic steel 5 which are parallel to each other are respectively arranged in the large magnetic steel groove 4 and the small magnetic steel groove 3.
According to another preferred embodiment of the present invention, as shown in fig. 2, the magnetic isolation bridges 33, 34, 55, 56, 100, 101 are respectively the narrowest portions formed by the small magnetic steel slots 3 and the rotor core, the large magnetic steel slots 4 and the rotor core, and the large magnetic steel slots and the large air slots 9, 10, and for convenience of installation, the shapes of the large and small magnetic steels are generally similar to the shapes of the large and small magnetic steel slots, and the sizes are slightly smaller. In the prior art, the magnetic steel and the magnetic steel groove are in rectangular (body) structures, the magnetic isolation bridges 33 and 34 are the narrowest parts of the small magnetic steel groove and the excircle of the rotor core, and the two parts are influenced most by the centrifugal force of the small magnetic steel when the rotor rotates at high speed. Preferably, the upper and lower edges L1, L2 of the small magnetic steel 3 are made into an arc shape (the upper and lower edges L3, L4 of the large magnetic steel 4 can be further made into an arc shape), the heights 44, 66(88, 99) of the arc are adjusted, the size 77 (the minimum distance from the edge L2 to the outer edge of the punching sheet) is ensured in a machinable range, and the high-speed stress analysis of the rotor punching sheet is carried out, so that the stress at the magnetic isolation bridges 33, 34 is obviously reduced by increasing the sizes of the arc heights 44, 66. Similarly, the arc heights 88 and 89 of the magnetic steels L3 and L4 are increased, and the stress at the magnetic isolation bridges 100 and 101 can be obviously reduced through the stress analysis of the high-speed rotor. In order to ensure the safe operation of the rotor, the high-speed stress of the magnetic isolation bridge is smaller than the yield strength of the punching sheet material. On the basis of guaranteeing rotor safety, through the width that increases little magnet steel simultaneously, just can increase magnetic field intensity, increase the motor and exert oneself, improve motor power density.
According to a further preferred embodiment of the present invention, for example using the prior art as a comparative example, the arc heights 44, 66 are 0mm (i.e. rectangular), the dimension 77 (the minimum distance from the edge L2 to the outer edge of the lamination) is 1.8mm, and the rotor is stressed at high speed as shown in fig. 3, where the maximum stress at the magnetic isolation bridge 56, for example, reaches 655.38 MPa. In the present invention, for example, when the size 77 (the minimum distance from the side L2 to the outer edge of the lamination) is reduced to 0.8mm, the arc heights 44 and 66 are increased, and the stress of the rotor during high-speed rotation is as shown in fig. 4, wherein, for example, the maximum stress at the magnetic isolation bridge 56 is 299.86 MPa. Further comparison shows that the force applied to the magnetic isolation bridges 55 and 56 in FIG. 4 is reduced by about 50% compared with the force applied to the magnetic isolation bridges 55 and 56 in FIG. 3.
According to the utility model discloses still another preferred embodiment, on for example keeping that size 77 is 0.8mm, increase arc height 44, 66 basis, can further increase the width 3.2mm of little magnet steel, the atress of each magnetism isolating bridge all is less than the yield strength of rotor punching material when the rotor is high-speed, and the motor increases of exerting oneself, and power density has improved 6%. Furthermore, the width of the large magnetic steel can be increased to improve the power density.
Compared with the prior art, the utility model discloses one or more technical effect below having:
1) through the design of the magnetic steel groove and the arc-shaped edge of the magnetic steel, the stress strength of the magnetic isolation bridge is reduced when the rotor rotates at a high speed;
2) the design of the arc-shaped edge of the magnetic steel changes the stress direction of the rotor magnetic steel slot, reduces the stress borne by the rotor, meets the requirement that the stress borne by the rotor is smaller than the yield strength of the rotor, and can meet the safety requirement;
3) under the condition of meeting the requirement that the stress borne by the rotor is smaller than the yield strength of the rotor, the width of the magnetic steel can be further increased so as to enhance the magnetic field strength and increase the motor output so as to improve the power density of the motor;
4) considering both electromagnetic and mechanical requirements, a sufficiently strong rotating magnetic field can be provided, and at the same time, the huge centrifugal force generated by high-speed rotation can be borne.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention, and the features of the embodiments that are not mutually inconsistent can be combined with each other. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a new energy automobile drive is with high power density PMSM rotor which characterized in that includes:
the punching sheet is provided with a motor shaft hole positioned in the center, lightening holes circumferentially arranged around the motor shaft hole and a magnetic steel groove group, and the magnetic steel groove group comprises a first magnetic steel groove and a second magnetic steel groove; and
the first magnetic steel and the second magnetic steel are correspondingly arranged in the first magnetic steel groove and the second magnetic steel groove respectively, the cross section of the second magnetic steel has a structure that upper and lower rectangular long edges are modified into upper and lower arc-shaped edges, the upper arc-shaped edge and the lower arc-shaped edge are bent towards the direction far away from the center of the punching sheet, the first magnetic steel is closer to the center of the punching sheet than the second magnetic steel, the shapes of the first magnetic steel and the second magnetic steel are respectively adaptive to the shapes of the first magnetic steel groove and the second magnetic steel groove, and the second magnetic steel has the width limited by the two rectangular short edges.
2. The high-power-density permanent magnet synchronous motor rotor for driving the new energy automobile according to claim 1, wherein the cross section of the first magnetic steel is of a structure that upper and lower long edges of a rectangle are modified into upper and lower arc-shaped edges, a first magnetic steel groove and a second magnetic steel groove are arranged in parallel, and the first magnetic steel groove is longer than and wider than the second magnetic steel groove; or the cross section of the first magnetic steel has a rectangular structure, and the first magnetic steel groove is longer than and wider than the second magnetic steel groove.
3. The rotor of the high-power-density permanent magnet synchronous motor for driving the new energy automobile according to claim 1 or 2, wherein the magnetic steel slot group further comprises a first air slot, a second air slot, a third air slot and a fourth air slot, the first magnetic steel slot, the first air slot, the second magnetic steel slot, the third air slot and the fourth air slot are sequentially arranged in a clockwise direction, and the second air slot and the third air slot are respectively adjacent to two ends of the second magnetic steel slot.
4. The high-power-density permanent magnet synchronous motor rotor for driving the new energy automobile is characterized in that a first magnetic isolation bridge is formed between the first magnetic steel groove and the first air groove, a second magnetic isolation bridge is formed between the first air groove and the outer edge of the punching sheet, a third magnetic isolation bridge is formed between the first end of the second magnetic steel groove and the outer edge of the punching sheet, a fourth magnetic isolation bridge is formed between the second end of the second magnetic steel groove and the outer edge of the punching sheet, a fifth magnetic isolation bridge is formed between the fourth air groove and the outer edge of the punching sheet, and a sixth magnetic isolation bridge is formed between the fourth air groove and the first magnetic steel groove.
5. The rotor of the high-power-density permanent magnet synchronous motor for driving the new energy automobile as claimed in claim 4, wherein the number of the lightening holes corresponds to the number of the magnetic steel slot groups.
6. The rotor of the high-power-density permanent magnet synchronous motor for driving the new energy automobile as claimed in claim 5, wherein the number of the magnetic steel groove groups is multiple, and the multiple magnetic steel groove groups are circumferentially arranged along an outer edge of the stamped steel.
7. The high-power-density permanent magnet synchronous motor rotor for driving the new energy automobile as claimed in claim 6, wherein the stamped sheet is circular, and the second magnetic steel groove is formed along the outer edge of the stamped sheet.
8. The high-power-density permanent magnet synchronous motor rotor for driving of the new energy automobile as claimed in claim 7, wherein the first air groove is arranged along a first radial direction of the punching sheet, and the fourth air groove is arranged along a second radial direction of the punching sheet.
9. The rotor of the high-power-density permanent magnet synchronous motor for driving the new energy automobile according to claim 8, wherein the first magnetic steel slot, the first air slot, the second magnetic steel slot, the third air slot and the fourth air slot are arranged to be approximately quadrangular.
10. The punching sheet included in the high-power-density permanent magnet synchronous motor rotor for driving the new energy automobile according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020363588.8U CN211701649U (en) | 2020-03-20 | 2020-03-20 | High-power-density permanent magnet synchronous motor rotor for driving new energy automobile and punching sheet thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020363588.8U CN211701649U (en) | 2020-03-20 | 2020-03-20 | High-power-density permanent magnet synchronous motor rotor for driving new energy automobile and punching sheet thereof |
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| CN211701649U true CN211701649U (en) | 2020-10-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928842A (en) * | 2021-01-28 | 2021-06-08 | 重庆长安新能源汽车科技有限公司 | Rotor punching sheet, rotor, permanent magnet synchronous motor and vehicle |
| CN113949185A (en) * | 2021-10-15 | 2022-01-18 | 浙江中车尚驰电气有限公司 | Rotor punching sheet compatible with high speed and low speed, rotor and motor thereof |
| WO2023171488A1 (en) * | 2022-03-09 | 2023-09-14 | ニデック株式会社 | Rotor and rotating electric machine |
-
2020
- 2020-03-20 CN CN202020363588.8U patent/CN211701649U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928842A (en) * | 2021-01-28 | 2021-06-08 | 重庆长安新能源汽车科技有限公司 | Rotor punching sheet, rotor, permanent magnet synchronous motor and vehicle |
| CN113949185A (en) * | 2021-10-15 | 2022-01-18 | 浙江中车尚驰电气有限公司 | Rotor punching sheet compatible with high speed and low speed, rotor and motor thereof |
| WO2023171488A1 (en) * | 2022-03-09 | 2023-09-14 | ニデック株式会社 | Rotor and rotating electric machine |
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