CN110875656B - Motor rotor, motor and electric automobile - Google Patents
Motor rotor, motor and electric automobile Download PDFInfo
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- CN110875656B CN110875656B CN201811015449.XA CN201811015449A CN110875656B CN 110875656 B CN110875656 B CN 110875656B CN 201811015449 A CN201811015449 A CN 201811015449A CN 110875656 B CN110875656 B CN 110875656B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to a motor rotor, a motor and an electric automobile, wherein the motor rotor comprises a rotor core formed by overlapping a plurality of rotor punching sheets, and the magnetic pole groups are arranged in the magnetic steel grooves of the rotor core at intervals along the circumferential direction, each magnetic pole group comprises a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet and the third permanent magnet are respectively arranged in a symmetrical structure relative to a radial central line along the circumferential direction, the second permanent magnets are a pair and are mutually symmetrically arranged at intervals on two sides of the first permanent magnet and the third permanent magnet relative to the radial central line, the pair of second permanent magnets incline towards the direction close to each other along the radial inward direction, the third permanent magnets are positioned on the inner side of the first permanent magnets at intervals in the radial central line direction, and the first radial dimension of the third permanent magnets in the radial central line direction is greater than the length of the short sides of the first permanent magnets and/or the second permanent magnets.
Description
Technical Field
The disclosure relates to the technical field of motors, in particular to a motor rotor, a motor and an electric automobile.
Background
The motor is widely applied to various technical fields as a driving device, for example, the motor can be used as a driving motor of an electric automobile to realize the function of driving the automobile to run, in this case, because the driving motor is limited by the yield strength of silicon steel sheets in a high-speed working state, a small-volume driving motor is usually required to be designed, and because the small-volume driving motor is limited by the arrangement space, the consumption of magnetic steel is too small, and the air gap flux density and the electromagnetic torque are reduced. In order to meet the torque requirement of the motor, the torque of the motor can be improved by adopting a mode of properly increasing the number of the permanent magnets, and most of the modes have the following problems that partial structures of the motor rotor in a use state, particularly local stress is excessively concentrated at the position of a rotor punching sheet corresponding to the permanent magnets and the like due to insufficient strength and the like, and further the service life of the whole motor is influenced.
Disclosure of Invention
The purpose of the present disclosure is to provide a motor rotor, a motor including the motor rotor, and an electric vehicle, which can improve the total torque of the motor and improve the stress distribution of the whole structure.
In order to achieve the above object, the present disclosure provides an electric motor rotor, the electric motor rotor includes a rotor core formed by stacking a plurality of rotor punching sheets, and a magnetic pole group, the magnetic pole group is disposed in each magnetic steel slot of the rotor core at intervals along a circumferential direction, each magnetic pole group includes a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet and the third permanent magnet are all disposed along the circumferential direction to be respectively symmetrical with respect to a radial center line, the second permanent magnet is a pair and is disposed at intervals at radial center lines at both sides of the first permanent magnet and the third permanent magnet, the second permanent magnet inclines toward a direction approaching each other along a radial direction, the third permanent magnet is disposed at intervals at an inner side of the first permanent magnet in the radial center line direction, and a first radial dimension of the third permanent magnet in the radial center line direction is greater than a transverse cross section of the first permanent magnet The length of the short side of the face and/or the length of the short side of the cross-section of the second permanent magnet.
Optionally, the magnetic steel groove includes a second magnetic steel groove for inserting the second permanent magnet and a third magnetic steel groove for inserting the third permanent magnet, an inner end of the second magnetic steel groove and the third magnetic steel groove are circumferentially spaced by a magnetic separation bridge, and the first radial dimension of the third permanent magnet is smaller than or equal to the 4/5 groove height of the inner end of the second magnetic steel groove in the radial center line direction.
Optionally, the width of the third permanent magnet in the circumferential direction is smaller than the width of the first permanent magnet.
Optionally, in each of the magnetic pole groups, the first permanent magnet is a symmetrical one with the radial center line as a reference, and the cross section of the first permanent magnet is formed into a flat structure extending along the circumferential direction, or in each of the magnetic pole groups, the first permanent magnet is a pair of permanent magnets arranged along the circumferential direction at intervals, the pair of permanent magnets are mutually symmetrically arranged with the radial center line as a reference, and the pair of permanent magnets are matched into a V-shaped structure with a radial outward opening.
Optionally, in each of the magnetic pole groups, the third permanent magnet is one of the magnetic pole groups that is symmetrical with respect to the radial center line, and has a cross section that is formed as a flat structure extending in the circumferential direction, or in each of the magnetic pole groups, the third permanent magnet is a pair of permanent magnets that are arranged at intervals in the circumferential direction, the pair of permanent magnets are symmetrical with respect to the radial center line, and the pair of permanent magnets are matched with each other to form a V-shaped structure that is open radially outward.
Alternatively, a pair of the second permanent magnets may be inclined radially inward toward a direction approaching each other to be configured as a V-shaped structure in cooperation with each other.
Optionally, the first permanent magnet and the second permanent magnet are formed in the same structure.
Optionally, the magnetic pole groups are even in number and uniformly distributed on the rotor core in the axial direction.
According to another aspect of the present disclosure, there is provided an electric machine comprising a stator and a rotor, the rotor being disposed within the stator and the rotor being as described above.
According to still another aspect of the present disclosure, there is provided an electric vehicle including the drive motor as described above.
Through the technical scheme, namely, the motor rotor of the present disclosure is provided with the third permanent magnet between the two second permanent magnets of the rotor core, the third permanent magnet is located on the inner side of the first permanent magnet 21 in the radial center line direction, wherein the first permanent magnet and the third permanent magnet are respectively symmetrical about the radial center line, and the two second permanent magnets are symmetrical about the radial center line. The motor rotor disclosed by the invention is additionally provided with the third permanent magnet on the basis of arranging the first permanent magnet on the rotor core along the circumferential direction, so that the whole using amount of the permanent magnet of the motor rotor is increased to improve the air gap flux density. The third permanent magnet applies larger pressure to the rotor punching sheet due to larger centrifugal force under the high-rotating-speed operation mode of the motor rotor, so that the phenomenon of stress concentration of yield strength occurs at the third permanent magnet of the rotor punching sheet. Therefore, the motor rotor disclosed by the invention has the advantages that the first radial dimension of the third permanent magnet in the radial center line direction is set to be larger than the length of the short side of the first permanent magnet and/or the second permanent magnet, namely, the stress concentration at the third permanent magnet of the rotor punching sheet is reduced by thickening the first radial dimension of the third permanent magnet extending along the radial center line direction, so that the overall stress distribution condition of the rotor core structure is improved, and the service reliability and the service life of the motor rotor are further improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a cross-sectional schematic view of a rotor of an electric machine showing one pole group according to one embodiment of the present disclosure;
FIG. 2 is a cross-sectional schematic view of a rotor of an electric machine showing one pole group in accordance with another embodiment of the present disclosure;
FIG. 3 is a block diagram of a rotor of an electric machine according to an embodiment of the present disclosure;
FIG. 4 is a cloud of stress distributions at a rotational speed of 20000rpm for a first radial dimension of 3.8mm for a third permanent magnet in a rotor of an electric machine;
fig. 5 is a cloud of stress distributions at a rotational speed of 20000rpm for a first radial dimension of 5.8mm for a third permanent magnet in a rotor of an electrical machine.
Description of the reference numerals
1 magnetic steel groove 2 magnetic pole group
3 magnetic isolation bridge 4 magnetic circuit area
10 rotor punching 11 first magnetic steel groove
12 second magnetic steel groove and 13 third magnetic steel groove
21 first permanent magnet 22 second permanent magnet
23 radial center line of third permanent magnet A
D first radial dimension S short side length
Height of H groove
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, unless otherwise stated, the use of directional terms such as "inner and outer" generally refers to inner and outer with respect to the outer contour of the electric machine rotor, "circumferential and radial" refer to circumferential and radial with respect to the electric machine rotor, and the reference to "cross section" in the present disclosure refers to the section shown in the direction of the corresponding drawing.
The present disclosure provides a motor rotor, a motor and an electric vehicle, wherein the motor may be a permanent magnet synchronous motor or the like, for example, may be a multi-pair permanent magnet synchronous motor having four pairs of poles, five pairs of poles or six pairs of poles as shown in fig. 3, especially an ultra high speed motor, that is, a motor having a rotation speed of 20000rpm or more, and the motor mentioned in the present disclosure may be used as a driving motor of an electric vehicle or the like. However, the present disclosure is not limited thereto, and may be applied to other technical fields.
As shown in fig. 1, according to an aspect of the present disclosure, there is provided an electric machine rotor including a rotor core formed by stacking a plurality of rotor sheets 10, and a pole group 2, where the pole group 2 is circumferentially disposed at intervals in each magnetic steel slot 1 of the rotor core, each pole group 2 includes a first permanent magnet 21, a second permanent magnet 22, and a third permanent magnet 23, the first permanent magnet 21 and the third permanent magnet 23 are circumferentially disposed in a structure symmetrical to each other with respect to a radial center line a, the second permanent magnets 22 are a pair and are symmetrically disposed at intervals on both sides of the first permanent magnet 21 and the third permanent magnet 23 with respect to the radial center line a, the pair of second permanent magnets 22 are inclined inward in a radial direction toward a direction close to each other, and the third permanent magnet 23 is disposed at an interval on an inner side of the first permanent magnet 21 in the radial center line a direction, a first radial dimension D of the third permanent magnet 23 in the direction of the radial center line a is greater than a length S of a short side of a cross section of the first permanent magnet 21 and/or a length S of a short side of a cross section of the second permanent magnet 22.
In the prior art, the ultra-high speed motor is generally small in design size due to the influence of the yield strength of a rotor punching sheet, so that the amount of magnetic steel installed in the rotor punching sheet is small, and the air gap flux density and the electromagnetic torque of the motor are reduced. In order to meet the total torque requirement of the motor in a high-speed state, a third permanent magnet 23 is arranged between the two second permanent magnets 22 of the rotor core, the third permanent magnet 23 is positioned on the inner side of the first permanent magnet 21 in the direction of the radial central line A, wherein the first permanent magnet 21 and the third permanent magnet 23 are respectively symmetrical about the radial central line A, and the two second permanent magnets 22 are symmetrical about the radial central line A. In the motor rotor disclosed by the invention, the third permanent magnet 23 is additionally arranged on the rotor core along the circumferential direction on the basis of the first permanent magnet 21, so that the overall usage amount of the permanent magnets of the motor rotor is increased and the air gap flux density is improved, specifically, in the magnetic pole group 2, the part surrounded by the first permanent magnet 21, the second permanent magnet 22 and the third permanent magnet 23 in the stacked rotor punching sheets 10 is formed into the magnetic circuit area 4, and the air gap flux density in the magnetic circuit area 4 is obviously improved due to the addition of the third permanent magnet 23, so that the electromagnetic torque is increased and the effect of improving the total torque of the motor rotor is achieved. The third permanent magnet 23 applies a larger pressure to the rotor sheet due to a larger centrifugal force in a high-speed operation mode of the motor rotor, so that the third permanent magnet 23 of the rotor sheet has a phenomenon of stress concentration of yield strength. In contrast, in the motor rotor of the present disclosure, the first radial dimension D of the third permanent magnet 23 in the radial center line a direction is set to be greater than the short side length S of the first permanent magnet 21 and/or the second permanent magnet 22, that is, the stress concentration at the third permanent magnet of the rotor sheet 10 is reduced by thickening the first radial dimension D of the third permanent magnet 23 extending in the radial center line a direction, so that the stress distribution of the whole rotor core structure is improved, and the service reliability and the service life of the motor rotor are further improved.
Optionally, the magnet steel slot 1 includes a second magnet steel slot 12 for inserting the second permanent magnet 22 and a third magnet steel slot 13 for inserting the third permanent magnet 23, the inner end of the second magnet steel slot 12 and the third magnet steel slot 13 are circumferentially spaced by a magnetic separation bridge 3, and the first radial dimension D of the third permanent magnet 23 is smaller than or equal to 4/5 slot height H of the inner end of the second magnet steel slot 12 in the radial centerline a direction. Here, on the premise that the third permanent magnet 23 is guaranteed not to demagnetize, the first radial dimension D may be selected according to actual process and demagnetization requirements, and herein, in order to avoid the phenomenon of easy demagnetization, the first radial dimension D of the third permanent magnet 23 is not easily designed to be too thin. In addition, the design of the magnetic isolation bridge 3 plays a role in reducing magnetic leakage, and the magnetic isolation bridge 3 can be designed to be as small as possible so as to effectively reduce the magnetic leakage and increase the air gap flux density. Under the condition that the magnetic isolation bridge 3 is arranged, the first radial dimension D of the third permanent magnet 23 is designed to be smaller than or equal to 4/5 groove height H of the inner side end part of the second magnetic steel groove 12 in the radial center line A direction, so that the stress concentration at the magnetic isolation bridge 3 positioned at two sides of the third permanent magnet 23 can be obviously reduced under a high-rotation-speed operation mode, the problem of strength deterioration at the magnetic isolation bridge 3 can be effectively avoided, and the stress distribution condition of the whole motor rotor is further improved. Here, on the premise that the first radial dimension D of the third permanent magnet 23 is greater than the short side length S of the first permanent magnet 21 and/or the second permanent magnet 22 and less than or equal to 4/5 slot height H of the inner end of the second magnetic steel slot 12 in the radial center line a direction, the first radial dimension D of the third permanent magnet 23 is preferably designed to be close to 4/5 slot height H of the inner end of the second magnetic steel slot 12 in the radial center line a direction, so that the first radial dimension D of the third permanent magnet is maximized within the above range 8, and the strength of the entire motor rotor is effectively ensured. For example, when the motor rotor as described above is used for a drive motor of an electric vehicle or the like, the first radial dimension D of the third permanent magnet 23 is 4.8cm to 6.4cm when the groove height H of the inner end portion of the second magnet steel groove 12 in the direction of the radial center line a in the motor rotor is 6cm to 8cm, and further, the first radial dimension D of the third permanent magnet 23 may be designed to be 5.8cm when the groove height H of the inner end portion of the second magnet steel groove 12 in the direction of the radial center line a in the motor rotor is 7.3 cm. However, the present disclosure is not limited thereto, and the first radial dimension D of the third permanent magnet 23 may be reasonably designed according to actual needs.
Here, in order to facilitate the third permanent magnet 23 to be disposed inside the first permanent magnet 21 in the radial center line a direction, so that the arrangement structure of the first permanent magnet 21, the second permanent magnet 22, and the third permanent magnet 23 on the rotor core is more compact and rational, optionally, the width of the third permanent magnet 23 in the circumferential direction is smaller than the width of the first permanent magnet 21. In order to optimize the layout and reasonably utilize the space of the first permanent magnet 21, the second permanent magnet 22 and the third permanent magnet 23 in each magnetic pole group, optionally, the first permanent magnet 21 is arranged at a position close to the outer end of the second permanent magnet 22 in the direction of the radial center line a, and the third permanent magnet 23 is arranged at a position close to the inner end of the second permanent magnet 22 in the direction of the radial center line a. Therefore, the first permanent magnet 21, the second permanent magnet 22 and the third permanent magnet 23 jointly form a wider magnetic circuit area 4, and the magnetic circuit design of the motor rotor is optimized.
Optionally, according to an embodiment of the present disclosure, in each of the magnetic pole groups 2, the first permanent magnet 21 is a symmetrical one with respect to the radial center line a, and the cross section of the first permanent magnet 21 is formed into a flat structure extending along the circumferential direction, so that the first permanent magnet 21 has good electromagnetic performance and has an effect of facilitating machining and assembling. Or, according to another embodiment of the present disclosure, optionally, in each of the magnetic pole groups 2, the first permanent magnet 21 is a pair of permanent magnets arranged at intervals along the circumferential direction, the pair of permanent magnets are symmetrical to each other with the radial center line a as a reference, and the pair of permanent magnets are matched to form a V-shaped structure with a radially outward opening. Therefore, under the condition that the electromagnetic performance requirement of the first permanent magnet 21 is met, the overall strength of the motor rotor is optimized, the first permanent magnet 21 with the V-shaped structure is more suitable for an ultrahigh rotating speed motor, the problem of stress concentration of the motor rotor in an ultrahigh rotating speed working state is solved, and the use reliability of the motor is further improved.
Accordingly, according to an embodiment of the present disclosure, optionally, in each of the magnetic pole groups 2, the third permanent magnet 23 is one that is symmetrical with respect to the radial center line a, and the cross section is formed in a flat structure extending in the circumferential direction, so that the third permanent magnet 23 has good electromagnetic performance and has an effect of facilitating machining and assembling. Or, according to another embodiment of the present disclosure, optionally, in each of the magnetic pole groups 2, the third permanent magnet 23 is a pair of permanent magnets arranged at intervals along the circumferential direction, the pair of permanent magnets are symmetrical to each other with the radial center line a as a reference, and the pair of permanent magnets are matched with each other to form a V-shaped structure which is open radially outward. Therefore, under the condition that the electromagnetic performance requirement of the third permanent magnet 23 is met, the overall strength of the motor rotor is optimized, the problem of stress concentration of the motor rotor in a use state is solved, and the use reliability of the motor is improved. Here, the first permanent magnet 21 and the third permanent magnet 23 may adopt various combined arrangement structures, for example, as shown in fig. 1, the first permanent magnet 21 and the third permanent magnet 23 respectively adopt one arrangement mode, as shown in fig. 2, the first permanent magnet 21 and the third permanent magnet 23 respectively adopt one arrangement mode, and as another example, the first permanent magnet 21 and the third permanent magnet 23 may adopt one arrangement mode, or the first permanent magnet 21 and the third permanent magnet 23 respectively adopt two arrangement modes, and as for the various arrangement structures, the disclosure does not particularly limit the arrangement structures. Here, in order to ensure that the motor rotor has excellent electromagnetic performance, improve the overall strength of the motor rotor, and meanwhile, be convenient for assembling each permanent magnet and make the arrangement structure of each magnetic pole group on the rotor core more reasonable, optionally, an arrangement structure in which the first permanent magnet 21 is two and the third permanent magnet 23 is one is adopted.
In addition, in order to further increase the total torque of the motor, it is particularly preferable that the pair of second permanent magnets 22 are inclined radially inward toward a direction approaching each other to be configured into a V-shaped configuration in cooperation with each other. The expression "radially" in the context of the second permanent magnets 22 being inclined radially inwardly towards each other as indicated in the present disclosure is to be understood as being inclined radially, i.e. may include the second permanent magnets 22 being in the strict sense radially, as well as the second permanent magnets 22 being at a small angle to the radial direction. For example, the structural design of the pair of second permanent magnets 22 arranged radially can change the saliency to improve the reluctance torque of the motor by selecting an appropriate saliency, as described above, the electromagnetic torque of the motor can be improved by the arrangement structure of the first permanent magnets 21 and the third permanent magnets 23, and the reluctance torque of the motor can be improved by the structure of the pair of second permanent magnets 22, whereby the motor of the present disclosure can obtain a significantly improved total torque. For another example, when the pair of second permanent magnets 22 is arranged, the pair of second permanent magnets 22 may be arranged at a certain angle with the radial direction in combination with the strength of the rotor sheet 10, rather than being arranged strictly in the radial direction, so that the arrangement may improve the magnetic group torque of the motor while reducing the influence on the strength of the rotor sheet.
Alternatively, the first permanent magnet 21 and the second permanent magnet 22 are formed in the same structure. Here, the first permanent magnet 21 and the second permanent magnet 22 may be made of the same material, and the same type of permanent magnet is beneficial to reducing the manufacturing and controlling costs of the permanent magnet, and also has the effect of facilitating the rapid assembly of the first permanent magnet 21 and the second permanent magnet 22 into the corresponding first magnet slot 11 and second magnet slot 12. However, the present disclosure is not limited thereto, and the first permanent magnet 21 and the second permanent magnet 22 may be designed appropriately according to actual needs, and for example, the first permanent magnet 21 and the second permanent magnet 22 may have structures with different shapes or sizes.
In this case, in order to generate a uniform magnetic field, the pole groups 2 are optionally even in number and distributed uniformly on the rotor core in the axial direction. As shown in fig. 3, in the four-pair-pole motor provided by the present invention, the number of the magnetic pole groups 2 is eight correspondingly to form four pairs of poles of the motor rotor. In other embodiments, different numbers of pole groups 2 may be provided, depending on the number of pole pairs.
According to another aspect of the present disclosure, there is provided an electric machine comprising a stator and a rotor as described above disposed within the stator.
According to still another aspect of the present disclosure, there is provided an electric vehicle including the drive motor as described above.
That is, the motor provided by the present disclosure may be suitably used as an ultra-high speed driving motor with a rotation speed up to 20000rpm in an electric vehicle, the motor and the electric vehicle of the present disclosure are configured such that a third permanent magnet 23 is provided between two second permanent magnets 22 of a rotor core, the third permanent magnet 23 is located inside a first permanent magnet 21 in a radial center line a direction, wherein the first permanent magnet 21 and the third permanent magnet 23 are each symmetric with respect to the radial center line a, and the two second permanent magnets 22 are symmetric with respect to the radial center line a. Herein, mainly determine the no-load air gap flux density according to the permanent magnet on the motor rotor, the motor and the electric vehicle of the present disclosure add the third permanent magnet 23 on the basis that the first permanent magnet 21 is circumferentially disposed on the rotor core, so that the overall usage of the permanent magnet of the motor rotor is increased and the air gap flux density is improved, specifically, in the magnetic pole group 2, the part surrounded by the first permanent magnet 21, the second permanent magnet 22 and the third permanent magnet 23 in the stacked rotor punching sheet 10 is constituted as the magnetic circuit region 4, and therefore the air gap flux density in the magnetic circuit region 4 is significantly improved due to the addition of the third permanent magnet 23, so that the electromagnetic torque is increased and the total torque of the motor is improved, so that the performance of the motor is significantly improved, and further the performance of the electric vehicle is also significantly improved, and the electric vehicle has wide practicability. In addition, the third permanent magnet 23 applies a larger pressure to the rotor punching sheet due to a larger centrifugal force in the high rotation speed operation mode of the motor rotor, so that a phenomenon of stress concentration at the third permanent magnet 23 of the rotor punching sheet occurs, for this reason, the motor rotor of the present disclosure sets the first radial dimension D of the third permanent magnet 23 in the direction of the radial centerline a to be larger than the short side length S of the first permanent magnet 21 and/or the second permanent magnet 22, that is, as can be seen particularly from the stress distribution cloud charts such as those shown in fig. 4 and 5, the maximum equivalent stress value at the third permanent magnet shown in fig. 4 is 494MPa, the maximum equivalent stress value at the third permanent magnet 23 shown in fig. 5 is 368MPa, and the equivalent stress value at the relatively thin third permanent magnet (particularly at the magnetic bridge 3 portion) shown in fig. 4 is significantly larger than that at the relatively thick third permanent magnet (particularly at the magnetic bridge 3 portion) shown in fig. 5 The effective stress value. Obviously, the stress concentration at the third permanent magnet 23 of the rotor sheet 10 can be significantly reduced by thickening the first radial dimension D of the third permanent magnet 23 extending along the radial center line a, so that the stress distribution of the whole rotor core structure is improved, and the use reliability and the service life of the motor rotor are improved.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (8)
1. The utility model provides a motor rotor, motor rotor includes the rotor core that is formed by a plurality of rotor punching (10) superposes, and the magnetic pole group, the magnetic pole group sets up along circumference interval in each magnetic steel groove (1) of rotor core, its characterized in that, each magnetic pole group (2) include first permanent magnet (21), second permanent magnet (22) and third permanent magnet (23), first permanent magnet (21) with third permanent magnet (23) all follow circumference arranges the structure about radial centerline (A) is symmetrical separately, second permanent magnet (22) are a pair and about radial centerline (A) interval arrangement is symmetrical each other in the both sides of first permanent magnet (21) with third permanent magnet (23), a pair of second permanent magnet (22) incline along the direction that radial inward orientation is close to each other, third permanent magnet (23) are in radial centerline (A) direction interval is located first permanent magnet (A) is last -inside a magnet (21), a first radial dimension (D) of the third permanent magnet (23) in the direction of the radial centre line (a) being larger than a short side length (S) of the cross section of the first permanent magnet (21) and/or a short side length (S) of the cross section of the second permanent magnet (22);
the first permanent magnet (21) and the second permanent magnet (22) are formed in the same structure;
the magnetic steel groove (1) is including being used for inserting second magnetic steel groove (12) of second permanent magnet (22) and being used for inserting third magnetic steel groove (13) of third permanent magnet (23), the inner of second magnetic steel groove (12) is on a parallel with radial centerline (A) direction outwards extends, the tip of third magnetic steel groove (13) is on a parallel with radial centerline (A) direction outwards extends, the inner of second magnetic steel groove (12) with third magnetic steel groove (13) is in it has magnetic separation bridge (3) to separate in the circumference interval, third permanent magnet (23) first radial dimension (D) is less than or equal to the inner of second magnetic steel groove (12) is in 4/5 groove height (H) on radial centerline (A) direction.
2. An electric machine rotor according to claim 1, characterized in that the width of the third permanent magnet (23) in the circumferential direction is smaller than the width of the first permanent magnet (21).
3. The electric machine rotor according to claim 1 or 2, characterized in that in each of the pole groups (2), the first permanent magnet (21) is one that is itself symmetrical with respect to the radial center line (a), and is formed in a flat-like structure extending in the circumferential direction in cross section.
4. The electric machine rotor according to claim 1 or 2, characterized in that, in each of the pole groups (2), the third permanent magnet (23) is one that is itself symmetrical with respect to the radial center line (A) and is formed in a cross-section in a flat-like structure extending in the circumferential direction, or,
in each magnetic pole group (2), the third permanent magnet (23) is a pair of permanent magnets arranged at intervals along the circumferential direction, the pair of permanent magnets are symmetrical with each other with the radial center line (A) as a reference, and the pair of permanent magnets are matched with each other to form a V-shaped structure with a radial outward opening.
5. An electric machine rotor, according to claim 1 or 2, characterized in that said pair of second permanent magnets (22) is inclined radially inwards towards each other, so as to cooperate with each other to constitute a V-shaped configuration.
6. An electric machine rotor according to claim 1 or 2, characterized in that the pole groups (2) are in an even number and are evenly distributed on the rotor core in the axial direction.
7. An electric machine, characterized in that the electric machine comprises a stator and a rotor, the rotor being arranged within the stator and the rotor being an electric machine rotor according to any of claims 1-6.
8. An electric vehicle characterized by comprising a drive motor according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811015449.XA CN110875656B (en) | 2018-08-31 | 2018-08-31 | Motor rotor, motor and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811015449.XA CN110875656B (en) | 2018-08-31 | 2018-08-31 | Motor rotor, motor and electric automobile |
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|---|---|
| CN110875656A CN110875656A (en) | 2020-03-10 |
| CN110875656B true CN110875656B (en) | 2021-12-07 |
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| CN201811015449.XA Active CN110875656B (en) | 2018-08-31 | 2018-08-31 | Motor rotor, motor and electric automobile |
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| GB2620418A (en) * | 2022-07-07 | 2024-01-10 | Jaguar Land Rover Ltd | Electric machine rotor |
| GB2620419A (en) * | 2022-07-07 | 2024-01-10 | Jaguar Land Rover Ltd | Electric machine rotor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012161228A (en) * | 2011-02-03 | 2012-08-23 | Toyota Motor Corp | Rotor for rotary electric machine |
| CN104184296A (en) * | 2013-05-21 | 2014-12-03 | 株式会社东芝 | Rotation motor |
| CN206226156U (en) * | 2016-10-19 | 2017-06-06 | 江苏航天动力机电有限公司 | A kind of new energy is phase asynchronous to start permanent-magnet synchronous motor rotor punching |
| CN206650517U (en) * | 2017-03-10 | 2017-11-17 | 牟特科技（北京）有限公司 | A kind of motor rotor punching sheet and motor |
-
2018
- 2018-08-31 CN CN201811015449.XA patent/CN110875656B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012161228A (en) * | 2011-02-03 | 2012-08-23 | Toyota Motor Corp | Rotor for rotary electric machine |
| CN104184296A (en) * | 2013-05-21 | 2014-12-03 | 株式会社东芝 | Rotation motor |
| CN206226156U (en) * | 2016-10-19 | 2017-06-06 | 江苏航天动力机电有限公司 | A kind of new energy is phase asynchronous to start permanent-magnet synchronous motor rotor punching |
| CN206650517U (en) * | 2017-03-10 | 2017-11-17 | 牟特科技（北京）有限公司 | A kind of motor rotor punching sheet and motor |
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