CN109149822B - Motor rotor and motor - Google Patents
Motor rotor and motor Download PDFInfo
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- CN109149822B CN109149822B CN201811320673.XA CN201811320673A CN109149822B CN 109149822 B CN109149822 B CN 109149822B CN 201811320673 A CN201811320673 A CN 201811320673A CN 109149822 B CN109149822 B CN 109149822B
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- motor rotor
- shaped mounting
- mounting section
- rotor
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- 238000009434 installation Methods 0.000 claims abstract description 23
- 238000002955 isolation Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 5
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 4
- 238000007885 magnetic separation Methods 0.000 claims 4
- 230000004888 barrier function Effects 0.000 claims 2
- 230000005415 magnetization Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 10
- 230000005389 magnetism Effects 0.000 description 18
- 230000000694 effects Effects 0.000 description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The application provides a motor rotor and a motor. The motor rotor comprises a rotor core and permanent magnets, a plurality of W-shaped mounting grooves are formed in the circumferential direction of the rotor core, openings of the W-shaped mounting grooves face the outer portion of the rotor core, and the permanent magnets are arranged in the W-shaped mounting grooves. Compared with the structure of adopting a trapezoidal magnet, a rectangular magnet and an inverted trapezoidal magnet in the traditional tangential permanent magnet synchronous motor, the permanent magnet is installed by adopting the W-shaped installation groove, so that the thickness of the permanent magnet can be reduced, and the magnetizing difficulty of the permanent magnet is reduced. In addition, the surface area of the permanent magnet in the W-shaped mounting groove is obviously improved relative to the structural surface areas of the traditional trapezoidal magnets, the traditional rectangular magnets and the traditional inverted trapezoidal magnets, so that the magnetic focusing capability of the motor rotor can be obviously improved, the torque density of the motor rotor is further improved, and the permanent magnet type permanent magnet motor is particularly suitable for improving the magnetic focusing capability of the motor rotor with less pole pairs.
Description
Technical Field
The application relates to the technical field of driving devices, in particular to a motor rotor and a motor.
Background
The permanent magnet synchronous motor with the tangential rotor structure has a 'magnetic focusing effect', and the torque density is typically larger than that of a common machine type, especially in the occasion with more pole pairs. In the case of fewer poles of the motor, the traditional tangential rotor structure is adopted, and the 'magnetism gathering effect' of the motor is obviously reduced.
When the pole pair number of the ferrite material tangential motor is lower than that of the ferrite material tangential motor with four pairs of poles, the output capacity of the tangential permanent magnet synchronous motor is not different from that of the permanent magnet synchronous motor with a general structure.
And when the pole pair number of the tangential motor made of the NdFeB material is lower than that of three pairs of poles, the 'magnetism gathering effect' is poor.
Traditional tangential PMSM, for example trapezoidal magnetite, rectangle magnetite, reverse trapezoidal magnetite structure, when the occasion application of lower pole pair number, there is the magnetite thickness very big, and the degree of difficulty of magnetizing is big, and the magnetite utilization ratio is low, gathers magnetic energy poor, and the structural strength of rotor receives very big restriction.
Disclosure of Invention
The application mainly aims to provide a motor rotor and a motor, which are used for solving the problems of high magnetizing difficulty and poor magnetic focusing capability of a tangential permanent magnet synchronous motor in the prior art.
In order to achieve the above object, according to one aspect of the present application, there is provided a motor rotor including a rotor core and a permanent magnet, the rotor core being provided with a plurality of W-shaped mounting grooves in a circumferential direction, an opening of the W-shaped mounting grooves being provided toward an outside of the rotor core, the permanent magnet being provided in the W-shaped mounting grooves.
Further, the W-shaped mounting groove comprises a first mounting section, a second mounting section, a third mounting section and a fourth mounting section which are sequentially communicated; the permanent magnets comprise a first permanent magnet, a second permanent magnet, a third permanent magnet and a fourth permanent magnet, wherein the first permanent magnet is installed in the first installation section, the second permanent magnet is installed in the second installation section, the third permanent magnet is installed in the third installation section, and the fourth permanent magnet is installed in the fourth installation section.
Further, in the same W-shaped mounting groove, the minimum distance between the first permanent magnet and the second permanent magnet and the minimum distance between the third permanent magnet and the fourth permanent magnet are d4, and the minimum distance between the second permanent magnet and the third permanent magnet is d5, wherein d5 is greater than 1mm, and d4 is greater than 3mm.
Further, in the same W-shaped mounting groove, an included angle between the first permanent magnet and the second permanent magnet and an included angle between the third permanent magnet and the fourth permanent magnet are c2, and an included angle between the second permanent magnet and the third permanent magnet is c1, wherein c1 is more than 10 degrees, and c2 is more than 15 degrees.
Further, in the same W-shaped mounting groove, a first magnetism isolating air gap is formed between the first permanent magnet and the second permanent magnet, a second magnetism isolating air gap is formed between the third permanent magnet and the fourth permanent magnet, and a third magnetism isolating air gap is formed before the second permanent magnet and the third permanent magnet.
Further, a fourth magnetic isolation air gap is arranged between one end of the first permanent magnet far away from the center of the motor rotor and one end of the first mounting section far away from the center of the motor rotor; a fifth magnetism isolating air gap is arranged between one end of the fourth permanent magnet, which is far away from the center of the motor rotor, and the end of the fourth installation section, which is far away from the center of the motor rotor.
Further, a first magnetic isolation bridge is arranged between the first mounting section and the outer edge of the rotor core, and a second magnetic isolation bridge is arranged between the fourth mounting section and the outer edge of the rotor core.
Further, between two adjacent W-shaped mounting grooves, the first mounting section and the fourth mounting section which are close to each other are parallel to each other, and the width between the first mounting section and the fourth mounting section is d2, wherein d2 is more than or equal to 2mm.
Further, the connecting section between the first installation section and the second installation section, the connecting section between the second installation section and the third installation section, and the connecting section between the third installation section and the fourth installation section are arc sections and/or straight line sections.
Further, the permanent magnet is injection molded or bonded to fill the W-shaped mounting groove.
Further, an iron core filling part is arranged in the middle of the W-shaped mounting groove, and divides the W-shaped mounting groove into two V-shaped mounting grooves.
Further, at least one of the core filling portions is provided with a magnetism isolating hole, and the magnetism isolating hole is located at the outer edge of the rotor core.
Further, the pole pair number of the motor rotor is 2 to 4.
Further, the permanent magnet is neodymium iron boron magnetic steel or ferrite magnetic steel.
Further, the magnetizing directions of the two adjacent permanent magnets are opposite.
According to another aspect of the present application, there is provided an electric machine comprising a motor rotor as described above.
Compared with the structure of adopting trapezoidal magnets, rectangular magnets and inverted trapezoidal magnets in the traditional tangential permanent magnet synchronous motor, the permanent magnet is installed by adopting the W-shaped installation groove, so that the thickness of the permanent magnet can be reduced, and the magnetizing difficulty of the permanent magnet can be reduced. In addition, the surface area of the permanent magnet in the W-shaped mounting groove is obviously improved relative to the structural surface areas of the traditional trapezoidal magnets, the traditional rectangular magnets and the traditional inverted trapezoidal magnets, so that the magnetic focusing capability of the motor rotor can be obviously improved, the torque density of the motor rotor is further improved, and the permanent magnet type permanent magnet motor is particularly suitable for improving the magnetic focusing capability of the motor rotor with less pole pairs.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
fig. 1 schematically shows a front view of a motor rotor of a conventional tangential permanent magnet synchronous motor;
fig. 2 schematically shows a front view of a first embodiment of the motor rotor of the present application;
fig. 3 schematically shows a front view of a second embodiment of the motor rotor of the present application;
fig. 4 schematically shows a front view of a third embodiment of the motor rotor of the present application;
fig. 5 schematically shows a front view of a fourth embodiment of the motor rotor of the present application;
fig. 6 schematically shows a front view of a fifth embodiment of the motor rotor of the present application.
Wherein the above figures include the following reference numerals:
10. a rotor core; 11. a W-shaped mounting groove; 111. a first mounting section; 112. a second mounting section; 113. a third mounting section; 114. a fourth mounting section; 115. v-shaped mounting grooves; 12. an iron core filling part; 13. a magnetism isolating hole; 14. trimming; 15. arc edges; 16. a rotor mounting hole; 20. a permanent magnet; 21. a first permanent magnet; 22. a second permanent magnet; 23. a third permanent magnet; 24. a fourth permanent magnet; 30. a first magnetic isolation air gap; 40. a third magnetic isolation air gap; 50. a fourth magnetic isolation air gap; 60. a fifth magnetic isolation air gap; 70. a first magnetically isolated bridge; 80. a second magnetically isolated bridge; 90. and a second magnetic isolation air gap.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
Referring to fig. 2 to 6, according to an embodiment of the present application, there is provided an electric machine, particularly a tangential rotor permanent magnet synchronous machine.
The motor in this embodiment includes a motor rotor, as shown in fig. 2, and in the first embodiment of the present application, the motor rotor includes a rotor core 10 and permanent magnets 20, a plurality of W-shaped mounting grooves 11 are provided in the circumferential direction of the rotor core 10, the openings of the W-shaped mounting grooves 11 are provided toward the outside of the rotor core 10, and the permanent magnets 20 are provided in the W-shaped mounting grooves 11.
Compared with the structure of adopting a trapezoidal magnet, a rectangular magnet and an inverted trapezoidal magnet (the reference numeral 1 in fig. 1) in the traditional tangential permanent magnet synchronous motor, the permanent magnet 20 is installed by adopting the W-shaped installation groove 11 in the embodiment, so that the thickness of the permanent magnet 20 can be reduced, and the magnetizing difficulty of the permanent magnet 20 can be reduced. In addition, the surface area of the permanent magnet 20 in the W-shaped mounting groove 11 in this embodiment is obviously improved relative to the structural surface areas of the conventional trapezoidal magnets, rectangular magnets and inverted trapezoidal magnets, so that the magnetic focusing capability of the motor rotor can be obviously improved, the torque density of the motor rotor can be further improved, and the device is particularly suitable for improving the magnetic focusing capability of the motor rotor with less pole pairs.
Preferably, the pole pair number of the motor rotor in this embodiment is 2 to 4.
The W-shaped mounting groove 11 in the present embodiment includes a first mounting section 111, a second mounting section 112, a third mounting section 113, and a fourth mounting section 114 that are sequentially communicated; correspondingly, the permanent magnet 20 includes a first permanent magnet 21, a second permanent magnet 22, a third permanent magnet 23, and a fourth permanent magnet 24, and when installed, the first permanent magnet 21 is installed in the first installation section 111, the second permanent magnet 22 is installed in the second installation section 112, the third permanent magnet 23 is installed in the third installation section 113, and the fourth permanent magnet 24 is installed in the fourth installation section 114.
Of course, in other embodiments of the present application, two or three or more permanent magnets 20 may be provided, and any other modifications within the spirit of the present application are within the scope of the present application.
Preferably, in the same W-shaped mounting groove 11, the minimum distance between the first permanent magnet 21 and the second permanent magnet 22 and the minimum distance between the third permanent magnet 23 and the fourth permanent magnet 24 are d4, and the minimum distance between the second permanent magnet 22 and the third permanent magnet 23 is d5, wherein d5 is more than 1mm, and d4 is more than 3mm. In a specific design, if the permanent magnet 20 is made of neodymium iron boron magnetic steel, d5 is more than 1mm; if the permanent magnet 20 is made of ferrite magnetic steel, d5 is more than 2mm; d4 is adjusted according to specific application requirements, so that the demagnetizing capability of the permanent magnet 20 can be improved while the torque density of the motor rotor is improved.
Preferably, in the same W-shaped mounting groove 11, the included angle between the first permanent magnet 21 and the second permanent magnet 22 and the included angle between the third permanent magnet 23 and the fourth permanent magnet 24 are c2, and the included angle between the second permanent magnet 22 and the third permanent magnet 23 is c1, wherein c1 is more than 10 degrees, c2 is more than 15 degrees, and when the permanent magnet 20 is made of neodymium iron boron magnetic steel, c1 is more than 10 degrees; if the permanent magnet 20 is made of ferrite magnetic steel, c1 is larger than 15 degrees, the torque density of the motor rotor can be further improved, and the demagnetizing capability of the permanent magnet 20 is improved.
Referring to fig. 1, in the same W-shaped mounting groove 11, a first magnetic isolation air gap 30 is provided between the first permanent magnet 21 and the second permanent magnet 22, a second magnetic isolation air gap 90 is provided between the third permanent magnet 23 and the fourth permanent magnet 24, and a third magnetic isolation air gap 40 is provided before the second permanent magnet 22 and the third permanent magnet 23. A fourth magnetic isolation air gap 50 is arranged between one end of the first permanent magnet 21 far away from the center of the motor rotor and one end of the first mounting section 111 far away from the center of the motor rotor; a fifth magnetic air gap 60 is provided between the end of the fourth permanent magnet 24 remote from the center of the motor rotor and the end of the fourth mounting segment 114 remote from the center of the motor rotor. The first magnetic bridge 70 is provided between the first mounting section 111 and the outer edge of the rotor core 10, and the second magnetic bridge 80 is provided between the fourth mounting section 114 and the outer edge of the rotor core 10. The magnetic leakage of the permanent magnet can be reduced and the utilization rate of the permanent magnet 20 can be improved while the structural strength of the motor rotor is ensured.
Between two adjacent W-shaped mounting grooves 11, the first mounting section 111 and the fourth mounting section 114 which are close to each other are parallel to each other, and the width between the first mounting section 111 and the fourth mounting section 114 is d2, wherein d2 is more than or equal to 2mm, the characteristic of the permanent magnet 20 can be improved, and the anti-demagnetizing capability is improved. The design is designed to take into account only the structural strength of the motor rotor, and not other factors.
Preferably, the connection section between the first mounting section 111 and the second mounting section 112, the connection section between the second mounting section 112 and the third mounting section 113, and the connection section between the third mounting section 113 and the fourth mounting section 114 in the present embodiment are arc sections and/or straight line sections.
The rotor core 10 in this embodiment is a cylindrical rotor core, and a plurality of cut edges 14 are provided on the outer periphery of the rotor core 10, wherein the proportion of the cut edges 14 to the circular arc edges 15 on the outer periphery of the rotor core 10 is 28% ± 5%, which is advantageous for the optimal torque output.
Preferably, the middle part of the W-shaped mounting groove 11 in this embodiment is disposed opposite to the cut edge 14, so that both ends of the W-shaped mounting groove 11 are disposed opposite to the circular arc edge 15.
The rotor core 10 is further provided with a rotor mounting hole 16 for facilitating assembly of the motor.
Preferably, the charging and sucking directions of the adjacent two permanent magnets 20 in this embodiment are opposite.
Referring to fig. 3 and 4, according to the second and third embodiments of the present application, there is provided a motor rotor having a structure substantially identical to that of the motor rotor of the first embodiment except that a core filling portion 12 is provided in the middle of the W-shaped mounting groove 11, the core filling portion 12 dividing the W-shaped mounting groove 11 into two V-shaped mounting grooves. In this embodiment, the core filling portion 12 is disposed in the middle of the W-shaped mounting groove 11 to form a magnetic isolation bridge, so that the structural strength of the rotor can be improved, and although the magnetic leakage is increased, the structural stability of the rotor is improved, and some occasions are suitable. At least one iron core filling part 12 is provided with a magnetism isolating hole 13, and the magnetism isolating hole 13 is positioned at the outer edge of the rotor iron core 10, so that the magnetic leakage phenomenon of the motor rotor is reduced.
Referring to fig. 5, according to a fourth embodiment of the present application, there is provided a motor rotor having a structure substantially identical to that of the motor rotor of the first embodiment except that the permanent magnets 20 of the present embodiment are filled in the W-shaped mounting grooves 11 by injection molding or bonding. The first magnetic isolation air gap 30, the third magnetic isolation air gap 40, the fourth magnetic isolation air gap 50, the fifth magnetic isolation air gap 60, the second magnetic isolation bridge 80 and the second magnetic isolation air gap 90 are not needed to be arranged in the structure, and the demagnetizing effect is not as high as that of the first embodiment, but the structural strength and the production efficiency of the motor rotor are high as those of the first embodiment.
Referring to fig. 6, according to a fifth embodiment of the present application, there is provided a motor rotor having a structure substantially identical to that of the motor rotor of the fourth embodiment except that a core filling portion 12 is provided in the middle of the W-shaped mounting groove 11, the core filling portion 12 dividing the W-shaped mounting groove 11 into two V-shaped mounting grooves. In this embodiment, the core filling portion 12 is disposed in the middle of the W-shaped mounting groove 11 to form a magnetic isolation bridge, so that the structural strength of the rotor can be improved, and although the magnetic leakage is increased, the structural stability of the rotor is improved, and some occasions are suitable. The core filling part 12 in this embodiment is provided with a magnetism isolating hole 13, and the magnetism isolating hole 13 is located at the outer edge of the rotor core 10, so as to reduce the magnetic leakage phenomenon of the motor rotor.
In combination with the above embodiment, the included angle c1 between two magnets inside the W-shaped mounting groove 11 is greater than 10 °, so that the anti-demagnetizing capability of the magnets can be improved more effectively. The other included angle c2 of the W-shaped mounting groove 11 is larger than 20 degrees, so that the magnetism gathering effect of the magnet can be effectively exerted. The length of the W-shaped mounting groove 11 is not affected by the angle, but the utilization rate thereof can be improved.
The middle of the derived W-shaped mounting groove 11 can be provided with a magnetism isolating bridge, and the W-shaped mounting groove 11 is changed into a double V-shaped mounting groove 115, so that the rotor structure can be reinforced. The derivative structure can be provided with magnetic isolation holes 13 for carrying out magnetic leakage reduction treatment.
Compared with the traditional structure in fig. 1, the torque density of the motor rotor scheme can be improved by more than 30%.
The structure is equally applicable to permanent magnet occasions with different materials, and the difference between the angle and the minimum distance is different. The gap is mainly used for better utilization of the permanent magnet and better utilization rate of the permanent magnet.
In the structural design of the application, the wall thickness of the rotor shaft hole and the shaft fit is sufficient, and the structural strength can be better ensured, while in the traditional scheme shown in fig. 1, the magnetism isolating bridge 2 and the magnetism isolating air gaps 3 and 3' on the rotor core 8 are weaker due to the magnetism isolating requirement, which is not beneficial to the structural strength of the rotor and the design of the shaft holding force.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
compared with the structure of adopting trapezoidal magnets, rectangular magnets and inverted trapezoidal magnets in the traditional tangential permanent magnet synchronous motor, the permanent magnet 20 is installed by adopting the W-shaped installation groove 11, so that the thickness of the permanent magnet 20 can be reduced, and the magnetizing difficulty of the permanent magnet 20 can be reduced. In addition, the surface area of the permanent magnet 20 in the W-shaped mounting groove 11 is obviously improved relative to the structural surface areas of the traditional trapezoidal magnets, rectangular magnets and inverted trapezoidal magnets, so that the magnetic focusing capability of the motor rotor can be obviously improved, the torque density of the motor rotor is further improved, and the permanent magnet mounting groove is particularly suitable for improving the magnetic focusing capability of the motor rotor with small pole pair numbers. The magnetic steel demagnetizing device can solve the problems that the tangential structure has low magnetic energy gathering capability when the pole pair number is low and the demagnetizing capability of the magnetic steel is reduced when the surface area of the magnetic steel is increased.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be capable of being practiced otherwise than as specifically illustrated and described. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (13)
1. The motor rotor is characterized by comprising a rotor core (10) and permanent magnets (20), wherein a plurality of W-shaped mounting grooves (11) are formed in the circumferential direction of the rotor core (10), openings of the W-shaped mounting grooves (11) are arranged towards the outside of the rotor core (10), and the permanent magnets (20) are arranged in the W-shaped mounting grooves (11); the W-shaped mounting groove (11) comprises a first mounting section (111), a second mounting section (112), a third mounting section (113) and a fourth mounting section (114) which are sequentially communicated;
the permanent magnet (20) comprises a first permanent magnet (21), a second permanent magnet (22), a third permanent magnet (23) and a fourth permanent magnet (24), wherein the first permanent magnet (21) is installed in the first installation section (111), the second permanent magnet (22) is installed in the second installation section (112), the third permanent magnet (23) is installed in the third installation section (113), and the fourth permanent magnet (24) is installed in the fourth installation section (114);
in the same W-shaped mounting groove (11), the minimum distance between the first permanent magnet (21) and the second permanent magnet (22) and the minimum distance between the third permanent magnet (23) and the fourth permanent magnet (24) are d4, and the minimum distance between the second permanent magnet (22) and the third permanent magnet (23) is d5, wherein d5 is more than 1mm, and d4 is more than 3mm;
in the same W-shaped mounting groove (11), the included angle between the first permanent magnet (21) and the second permanent magnet (22) and the included angle between the third permanent magnet (23) and the fourth permanent magnet (24) are c2, and the included angle between the second permanent magnet (22) and the third permanent magnet (23) is c1, wherein c1 is more than 10 degrees and c2 is more than 15 degrees.
2. The electric machine rotor according to claim 1, characterized in that in the same W-shaped mounting groove (11) there is a first magnetic separation air gap (30) between the first permanent magnet (21) and the second permanent magnet (22), a second magnetic separation air gap (90) between the third permanent magnet (23) and the fourth permanent magnet (24), and a third magnetic separation air gap (40) before the second permanent magnet (22) and the third permanent magnet (23).
3. The electric motor rotor according to claim 1, characterized in that a fourth magnetic separation air gap (50) is provided between the end of the first permanent magnet (21) remote from the center of the electric motor rotor and the end of the first mounting section (111) remote from the center of the electric motor rotor;
a fifth magnetic isolation air gap (60) is arranged between one end of the fourth permanent magnet (24) far away from the center of the motor rotor and one end of the fourth mounting section (114) far away from the center of the motor rotor.
4. The electric machine rotor according to claim 1, characterized in that a first magnetic barrier bridge (70) is provided between the first mounting section (111) and the outer edge of the rotor core (10), and a second magnetic barrier bridge (80) is provided between the fourth mounting section (114) and the outer edge of the rotor core (10).
5. An electric motor rotor according to claim 1, characterized in that between two adjacent W-shaped mounting grooves (11), the first mounting section (111) and the fourth mounting section (114) which are adjacent are parallel to each other, and the width between the first mounting section (111) and the fourth mounting section (114) is d2, wherein d2 is ≡2mm.
6. The electric motor rotor as recited in claim 1, characterized in that the connection between the first mounting section (111) and the second mounting section (112), the connection between the second mounting section (112) and the third mounting section (113), the connection between the third mounting section (113) and the fourth mounting section (114) are arc-shaped sections and/or straight-line sections.
7. Motor rotor according to claim 1, characterized in that the permanent magnets (20) are injection-molded or glued to fill the W-shaped mounting groove (11).
8. The motor rotor according to claim 1 or 7, characterized in that an iron core filling part (12) is provided in the middle of the W-shaped mounting groove (11), the iron core filling part (12) dividing the W-shaped mounting groove (11) into two V-shaped mounting grooves.
9. The electric motor rotor as recited in claim 8, characterized in that at least one of the core filling portions (12) is provided with magnetic shielding holes (13), the magnetic shielding holes (13) being located at an outer edge of the rotor core (10).
10. An electric motor rotor according to any one of claims 1 to 9, characterized in that the pole pair number of the motor rotor is 2 to 4.
11. The electric machine rotor according to any one of claims 1 to 9, characterized in that the permanent magnets (20) are neodymium-iron-boron magnetic steel or ferrite magnetic steel.
12. The electric machine rotor according to any one of claims 1 to 9, characterized in that the magnetization directions of adjacent two of the permanent magnets (20) are opposite.
13. An electric machine comprising a motor rotor, characterized in that the motor rotor is the motor rotor according to any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320673.XA CN109149822B (en) | 2018-11-07 | 2018-11-07 | Motor rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320673.XA CN109149822B (en) | 2018-11-07 | 2018-11-07 | Motor rotor and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109149822A CN109149822A (en) | 2019-01-04 |
| CN109149822B true CN109149822B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811320673.XA Active CN109149822B (en) | 2018-11-07 | 2018-11-07 | Motor rotor and motor |
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| CN (1) | CN109149822B (en) |
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| CN116566088A (en) * | 2023-06-15 | 2023-08-08 | 淮阴工学院 | Rotor structure of permanent magnet synchronous motor |
| CN117767614A (en) * | 2023-12-26 | 2024-03-26 | 淮阴工学院 | Surface-mounted-built-in hybrid permanent magnet synchronous motor rotor structure |
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| CN1581641A (en) * | 2003-08-13 | 2005-02-16 | 朱明聪 | Self-start permanent magnet synchronous motor rotor structure |
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| CN102130522A (en) * | 2011-04-18 | 2011-07-20 | 无锡新大力电机有限公司 | High-air gap flux density magnetic field rotor sheet |
| CN104638863A (en) * | 2015-01-23 | 2015-05-20 | 浙江迈雷科技有限公司 | Permanent-magnet synchronous motor |
| WO2016115722A1 (en) * | 2015-01-23 | 2016-07-28 | 浙江迈雷科技有限公司 | Permanent magnet synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581641A (en) * | 2003-08-13 | 2005-02-16 | 朱明聪 | Self-start permanent magnet synchronous motor rotor structure |
| CN1617423A (en) * | 2004-11-29 | 2005-05-18 | 天津大学 | Controllable flux permament magnetic synchronous motor of built-in mixed rotor magnetic path structure |
| CN102130522A (en) * | 2011-04-18 | 2011-07-20 | 无锡新大力电机有限公司 | High-air gap flux density magnetic field rotor sheet |
| CN104638863A (en) * | 2015-01-23 | 2015-05-20 | 浙江迈雷科技有限公司 | Permanent-magnet synchronous motor |
| WO2016115722A1 (en) * | 2015-01-23 | 2016-07-28 | 浙江迈雷科技有限公司 | Permanent magnet synchronous motor |
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| CN109149822A (en) | 2019-01-04 |
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