CN109217513B - Motor rotor, motor, compressor and heat pump system - Google Patents
Motor rotor, motor, compressor and heat pump system Download PDFInfo
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- CN109217513B CN109217513B CN201811320639.2A CN201811320639A CN109217513B CN 109217513 B CN109217513 B CN 109217513B CN 201811320639 A CN201811320639 A CN 201811320639A CN 109217513 B CN109217513 B CN 109217513B
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- permanent magnet
- motor rotor
- inverted
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- magnetic
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- 238000009434 installation Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 230000005389 magnetism Effects 0.000 claims description 22
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 6
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 230000005415 magnetization Effects 0.000 claims description 2
- 238000007885 magnetic separation Methods 0.000 claims 2
- 230000004888 barrier function Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 10
- 230000004907 flux Effects 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000005347 demagnetization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
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
Abstract
The application provides a motor rotor, a motor, a compressor and a heat pump system. The motor rotor comprises a rotor core and permanent magnets, a plurality of inverted N-shaped mounting grooves are formed in the circumferential direction of the rotor core, and a plurality of permanent magnets are arranged in the extending direction of each inverted N-shaped mounting groove. 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 inverted N-shaped installation groove, and the permanent magnet is divided into a plurality of pieces to be installed in the inverted N-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. The surface area of the permanent magnet in the inverted N-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 mounting groove 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, a motor, a compressor and a heat pump system.
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, a motor, a compressor and a heat pump system, so as to solve 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 permanent magnets, the rotor core being provided with a plurality of inverted N-shaped mounting grooves in a circumferential direction thereof, each of the inverted N-shaped mounting grooves being provided with a plurality of the permanent magnets in an extending direction thereof.
Further, the inverted N-shaped mounting groove comprises a first mounting section, a second mounting section and a third mounting section which are sequentially connected; the plurality of permanent magnets comprise a first permanent magnet, a second permanent magnet and a third 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, and the third permanent magnet is installed in the third installation section.
Further, the thickness d4 of the first permanent magnet is greater than or equal to the thickness d3 of the second permanent magnet.
Further, the thickness d4 of the first permanent magnet is 1.3 to 1.6 times the thickness d3 of the second permanent magnet.
Further, the thickness of each of the second permanent magnet and the third permanent magnet is not less than 1mm.
Further, the thickness of each of the second permanent magnet and the third permanent magnet is not less than 3mm.
Further, the length of the second permanent magnet is smaller than the length of the third permanent magnet.
Further, in the same inverted N-shaped mounting groove, a first magnetic isolation air gap is formed between the first permanent magnet and the second permanent magnet, and a second magnetic isolation air gap is formed between the second permanent magnet and the third permanent magnet.
Further, in the same inverted N-shaped mounting groove, a minimum distance between the first permanent magnet and the second permanent magnet is d2, and a minimum distance between the second permanent magnet and the third permanent magnet is d1, wherein d1 is greater than 2mm, and d2 is greater than 1mm.
Further, in the same inverted N-shaped mounting groove, an included angle between the first permanent magnet and the second permanent magnet is c3, and an included angle between the second permanent magnet and the third permanent magnet is c1; in the two adjacent inverted N-shaped mounting grooves, the included angle between the first permanent magnet and the third permanent magnet which are close to each other is c2; wherein c1 is greater than 15 degrees, c2 is greater than 15 degrees, and c3 is greater than 15 degrees.
Further, in the same inverted N-shaped mounting groove, a third magnetism isolating air gap is arranged between one end of the first permanent magnet far away from the center of the motor rotor and the end of the first mounting section far away from the center of the motor rotor.
Further, a first magnetism isolating bridge is arranged between the first mounting section and the outer edge of the rotor core.
Further, in the same inverted N-shaped mounting groove, a fourth magnetism isolating air gap is formed between one end of the third permanent magnet, which is close to the center of the motor rotor, and the end of the third mounting section, which is close to the center of the motor rotor.
Further, in the two adjacent inverted N-shaped mounting grooves, a second magnetism isolating bridge is arranged between the first mounting section and the third mounting section which are close to each other.
Further, the outer edge of the rotor core is provided with a first magnetism adjusting groove, and the first magnetism adjusting groove is communicated with the first installation section or is arranged at intervals.
Further, the outer edge of the rotor core is provided with a second magnetic regulating groove and a third magnetic regulating groove, the second magnetic regulating groove is vertically communicated with the first installation section, two parts of the second magnetic regulating groove are respectively provided with one third magnetic regulating groove, and a preset distance is reserved between the third magnetic regulating groove and the second magnetic regulating groove.
Further, both ends of the second magnetic regulating groove are provided with protruding parts protruding out of the first installation section, the width of each protruding part is d7, and the length of each d7 is 2 to 3 times of the thickness of the first permanent magnet; the preset distance between the second magnetic regulating groove and the third magnetic regulating groove is d6, and the width of d6 is smaller than the thickness of the first permanent magnet; the widths of the second magnetic regulating groove and the third magnetic regulating groove along the radial direction of the rotor core are d5, and d5 is smaller than the thickness of the first permanent magnet.
Further, the permanent magnet is ferrite magnetic steel or neodymium-iron-boron magnetic steel.
Further, the pole pair number of the motor rotor is 2 to 4.
Further, the magnetizing directions of the two adjacent permanent magnets are opposite.
Further, the rotor core is a cylindrical rotor core, a plurality of trimming edges are arranged on the periphery of the rotor core, and the trimming edges occupy 28% ± 5% of the circular arc edges of the periphery of the rotor core.
According to another aspect of the present application, there is provided an electric machine comprising a motor rotor as described above.
According to a third aspect of the present application, there is provided a compressor comprising a motor as described above.
According to a fourth aspect of the present application there is provided a heat pump system comprising a compressor, the compressor being the compressor described above.
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 technical scheme of the application has the advantages that the inverted N-shaped mounting groove is adopted to mount the permanent magnet, the permanent magnet is divided into a plurality of pieces to be mounted in the inverted N-shaped mounting groove, 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 inverted N-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 mounting groove 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 first embodiment of the motor rotor of the present application;
fig. 2 schematically shows a magnetizing direction map of a first embodiment of the motor rotor of the present application;
fig. 3 schematically shows a front view of a rotor core in a second embodiment of a motor rotor of the present application;
fig. 4 schematically shows a front view of a rotor core in a third embodiment of a motor rotor of the present application;
fig. 5 schematically shows a front view of a motor rotor of a conventional tangential permanent magnet synchronous motor.
Wherein the above figures include the following reference numerals:
10. a rotor core; 11. an inverted N-shaped mounting groove; 111. a first mounting section; 112. a second mounting section; 113. a third mounting section; 12. a first magnetism regulating groove; 13. a second magnetism regulating groove; 14. a third magnetism regulating groove; 15. trimming; 16. arc edges; 17. a rotor mounting hole; 20. a permanent magnet; 21. a first permanent magnet; 22. a second permanent magnet; 23. a third permanent magnet; 30. a second magnetic isolation air gap; 40. a third magnetic isolation air gap; 50. a first magnetically isolated bridge; 60. a fourth magnetic isolation air gap; 70. a second magnetically isolated bridge; 80. a first 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 positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Referring to fig. 1 to 4, 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. 1, and in the first embodiment of the present application, the motor rotor includes a rotor core 10 and permanent magnets 20, a plurality of inverted N-shaped mounting grooves 11 are provided in the circumferential direction of the rotor core 10, and a plurality of permanent magnets 20 are provided in the extending direction of each of the inverted N-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. 5) in the traditional tangential permanent magnet synchronous motor, the inverted N-shaped mounting groove 11 is adopted to mount the permanent magnet 20 in the embodiment, and the permanent magnet 20 is divided into a plurality of pieces to be mounted in the inverted N-shaped mounting 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 inverted N-shaped mounting groove 11 in the embodiment is obviously improved relative to the structural surface areas of the conventional trapezoidal magnet, rectangular magnet and inverted trapezoidal magnet, 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 method is particularly suitable for improving the magnetic focusing capability of the motor rotor with few pole pairs.
Preferably, the pole pair number of the motor rotor in this embodiment is 2 to 4.
Referring to fig. 1 and 2, the inverted N-shaped mounting groove 11 in the present embodiment includes a first mounting section 111, a second mounting section 112, and a third mounting section 113 connected in sequence; correspondingly, the plurality of permanent magnets 20 include the first permanent magnet 21, the second permanent magnet 22 and the third permanent magnet 23, and when the permanent magnets are installed, the first permanent magnet 21 is lowered to be installed in the first installation section 111, the second permanent magnet 22 is installed in the second installation section 112, and the third permanent magnet 23 is installed in the third installation section 113.
Of course, in other embodiments of the present application, two 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.
In a specific design, the thickness d4 of the first permanent magnet 21 is greater than the thickness d3 of the second permanent magnet 22 in this embodiment, and the permanent magnet 20 is particularly suitable for design using ferrite magnetic steel. Preferably, the thickness d4 of the first permanent magnet 21 is 1.3 to 1.6 times, for example 1.4 times, 1.5 times, the thickness d3 of the second permanent magnet 22. The thickness d3 of the second permanent magnet 22 and the thickness of the third permanent magnet 23 are both not less than 3mm.
The thickness of the first permanent magnet 21 is larger than that of the second permanent magnet 22 in this embodiment, which is beneficial to improving the sinusoidal air gap flux density and the anti-demagnetizing capability.
The permanent magnet 20 in this embodiment may also be neodymium iron boron magnetic steel, and at this time, the thickness of the second permanent magnet 22 and the third permanent magnet 23 is not less than 1mm. In practical arrangement, the thickness of the second permanent magnet 22 is not too large due to space limitation, which is convenient for effective utilization and improving anti-demagnetization capability.
Referring again to fig. 1 and 2, the length of the second permanent magnet 22 in this embodiment is smaller than the length of the third permanent magnet 23. It should be noted that, this design requirement is related to the rotation direction of the motor rotor, and when the length of the second permanent magnet 22 is smaller than that of the third permanent magnet 23, the rotation direction of the motor rotor is counterclockwise, and at this time, demagnetization occurs on the left side, and magnetization occurs on the right side, which is beneficial to improving the back electromotive force positive rotation of the load.
Preferably, in the same inverted N-shaped mounting groove 11, a first magnetism isolating air gap 80 is arranged between the first permanent magnet 21 and the second permanent magnet 22, a second magnetism isolating air gap 30 is arranged between the second permanent magnet 22 and the third permanent magnet 23, so that the magnetic leakage of the permanent magnets is reduced and the utilization rate of the permanent magnets is improved while the structural strength is ensured.
The minimum distance between the first permanent magnet 21 and the second permanent magnet 22 is d2, and the minimum distance between the second permanent magnet 22 and the third permanent magnet 23 is d1, wherein d1 is more than 2mm, and d2 is more than 1mm. The included angle between the first permanent magnet 21 and the second permanent magnet 22 is c3, the included angle between the second permanent magnet 22 and the third permanent magnet 23 is c1, and the included angle between the first permanent magnet 21 and the third permanent magnet 23 in the two adjacent inverted-N-shaped mounting grooves 11 is c2, wherein c1 is more than 15 degrees, c3 is more than 15 degrees, and c2 is more than 15 degrees. By the above design, the characteristic of the second permanent magnet 22 can be improved, and the demagnetization resistance can be improved. The included angle between the first permanent magnet 21 and the second and third permanent magnets 22 and 23 is not too small, if the included angle is small, the three permanent magnets represent the magnetic performance to be reduced, and the demagnetizing capability is not facilitated, so that the application can ensure the simultaneous improvement of the demagnetizing capability.
Preferably, in the same inverted N-shaped mounting groove 11, a third magnetic isolation air gap 40 is provided between the end of the first permanent magnet 21 remote from the center of the motor rotor and the end of the first mounting section 111 remote from the center of the motor rotor. The first mounting section 111 has a first magnetism isolating bridge 50 between it and the outer edge of the rotor core 10. The design is particularly suitable for a motor rotor rotating anticlockwise, and is convenient for improving air gap flux density sine.
Preferably, in the same inverted N-shaped mounting groove 11, a fourth magnetic air gap 60 is provided between the end of the third permanent magnet 23 near the center of the motor rotor and the end of the third mounting section 113 near the center of the motor rotor. In the two adjacent inverted N-shaped mounting grooves 11, the second magnetism isolating bridge 70 is provided between the first mounting section 111 of the first inverted N-shaped mounting groove 11 and the third mounting section 113 of the second inverted N-shaped mounting groove 11, so that the anti-demagnetization capability of the motor rotor can be further improved.
The rotor core 10 in this embodiment is a cylindrical rotor core, and a plurality of cut edges 15 are provided on the outer periphery of the rotor core 10, wherein the proportion of the cut edges 15 to the circular arc edges 16 on the outer periphery of the rotor core 10 is 28% ± 5%, which is advantageous for the optimal torque output.
The rotor core 10 is also provided with a rotor mounting hole 17, which facilitates the assembly of the motor.
Referring to fig. 3, according to a second 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 outer edge of the rotor core 10 of the present embodiment is provided with a first magnetism adjusting groove 12, and the first magnetism adjusting groove 12 is disposed in communication with or spaced apart from the first mounting section 111. This design is particularly useful in the case of permanent magnets 20 being neodymium-iron-boron magnetic steels, facilitating improved air gap flux density sinusoids. In the present embodiment, the thicknesses of the first permanent magnet 21 and the second permanent magnet 22 may be uniform, and the demagnetization resistance of the permanent magnet 20 may not be significantly reduced.
Referring to fig. 4, according to a third embodiment of the present application, there is provided a motor rotor, the structure of which is substantially identical to that of the motor rotor of the first embodiment, except that the outer edge of the rotor core 10 of the present embodiment is provided with a second magnetic flux controlling slot 13 and a third magnetic flux controlling slot 14, the second magnetic flux controlling slot 13 is vertically connected with the first mounting section 111, both parts of the second magnetic flux controlling slot 13 are provided with a third magnetic flux controlling slot 14, and a predetermined distance is provided between the third magnetic flux controlling slot 14 and the second magnetic flux controlling slot 13, which is particularly suitable for the case that the permanent magnet 20 is a neodymium-iron-boron permanent magnet, so as to facilitate improvement of air-gap density sine. In the present embodiment, the thicknesses of the first permanent magnet 21 and the second permanent magnet 22 may be uniform, and the demagnetization resistance of the permanent magnet 20 may not be significantly reduced.
In actual arrangement, both ends of the second magnetism adjusting groove 13 are provided with protruding portions protruding from the first mounting section 111, the width of the protruding portions is d7, and the length of the protruding portions is 2 to 3 times the thickness of the first permanent magnet 21. The width between the second magnetic regulating groove 13 and the third magnetic regulating groove 14 is d6, and the width of d6 is smaller than the thickness of the first permanent magnet 21. The widths of the second magnetic regulating groove 13 and the third magnetic regulating groove 14 in the radial direction of the rotor core 10 are d5, and d5 is smaller than the thickness of the first permanent magnet 21. The second magnetic regulating groove 13 and the third magnetic regulating groove 14 are beneficial to improving the air gap back electromotive force sinusoidal and increasing the torque density.
By software simulation comparison, the torque density improvement of the motor rotor scheme of the application can be more than 30% compared with the conventional structure in fig. 5.
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, the structural strength can be better ensured, while in the traditional scheme shown in fig. 5, 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.
According to another aspect of the present application, there is provided a compressor including a motor as described above.
According to yet another aspect of the present application, there is provided a heat pump system comprising a compressor, the compressor being the compressor described above.
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 a trapezoidal magnet, a rectangular magnet and an inverted trapezoidal magnet in the traditional tangential permanent magnet synchronous motor, the permanent magnet 20 is installed by adopting the inverted N-shaped installation groove 11, and the permanent magnet 20 is divided into a plurality of pieces to be installed in the inverted N-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 inverted N-shaped mounting groove 11 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 mounting groove is particularly suitable for improving the magnetic focusing capability of the motor rotor with small pole pair numbers.
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 (20)
1. The motor rotor is characterized by comprising a rotor core (10) and permanent magnets (20), wherein a plurality of inverted N-shaped mounting grooves (11) are formed in the circumferential direction of the rotor core (10), and a plurality of permanent magnets (20) are arranged in the extending direction of each inverted N-shaped mounting groove (11);
the inverted N-shaped mounting groove (11) comprises a first mounting section (111), a second mounting section (112) and a third mounting section (113) which are sequentially connected;
the plurality of permanent magnets (20) comprise a first permanent magnet (21), a second permanent magnet (22) and a third permanent magnet (23), 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), and the third permanent magnet (23) is installed in the third installation section (113);
the thickness d4 of the first permanent magnet (21) is greater than or equal to the thickness d3 of the second permanent magnet (22);
in the same inverted N-shaped mounting groove (11), the minimum distance between the first permanent magnet (21) and the second permanent magnet (22) is d2, and the minimum distance between the second permanent magnet (22) and the third permanent magnet (23) is d1, wherein d1 is more than 2mm, and d2 is more than 1mm.
2. The electric motor rotor according to claim 1, characterized in that the thickness d4 of the first permanent magnet (21) is 1.3 to 1.6 times the thickness d3 of the second permanent magnet (22).
3. The electric motor rotor according to claim 1, characterized in that the thickness of both the second permanent magnet (22) and the third permanent magnet (23) is not less than 1mm.
4. A motor rotor according to claim 3, characterized in that the thickness of both the second permanent magnet (22) and the third permanent magnet (23) is not less than 3mm.
5. The electric motor rotor according to claim 1, characterized in that the length of the second permanent magnet (22) is smaller than the length of the third permanent magnet (23).
6. The electric motor rotor according to claim 1, characterized in that in the same inverted N-shaped mounting groove (11) a first magnetic isolating air gap (80) is provided between the first permanent magnet (21) and the second permanent magnet (22), and a second magnetic isolating air gap (30) is provided between the second permanent magnet (22) and the third permanent magnet (23).
7. The electric motor rotor according to claim 1, characterized in that in the same inverted N-shaped mounting groove (11), the angle between the first permanent magnet (21) and the second permanent magnet (22) is c3, and the angle between the second permanent magnet (22) and the third permanent magnet (23) is c1;
in the two adjacent inverted N-shaped mounting grooves (11), the included angle between the first permanent magnet (21) and the third permanent magnet (23) which are close to each other is c2;
wherein c1 is greater than 15 degrees, c2 is greater than 15 degrees, and c3 is greater than 15 degrees.
8. An electric motor rotor as claimed in claim 1, characterized in that in the same inverted N-shaped mounting groove (11), a third magnetic separation air gap (40) is provided between the end of the first permanent magnet (21) remote from the centre of the electric motor rotor and the end of the first mounting section (111) remote from the centre of the electric motor rotor.
9. The electric motor rotor as recited in claim 1, characterized in that the first mounting section (111) has a first magnetically isolated bridge (50) between the first mounting section and an outer edge of the rotor core (10).
10. An electric motor rotor as claimed in claim 1, characterized in that in the same inverted N-shaped mounting groove (11), a fourth magnetic separation air gap (60) is provided between the end of the third permanent magnet (23) close to the centre of the electric motor rotor and the end of the third mounting section (113) close to the centre of the electric motor rotor.
11. The electric motor rotor according to claim 1, characterized in that in adjacent two of the inverted N-shaped mounting grooves (11), a second magnetic barrier bridge (70) is provided between the first mounting section (111) and the third mounting section (113) that are adjacent.
12. The electric motor rotor as recited in claim 1, characterized in that the outer edge of the rotor core (10) is provided with a first magnetically modulated groove (12), the first magnetically modulated groove (12) being arranged in communication with or spaced apart from the first mounting section (111).
13. The motor rotor according to claim 1, characterized in that the outer edge of the rotor core (10) is provided with a second magnetic regulating groove (13) and a third magnetic regulating groove (14), the second magnetic regulating groove (13) is vertically communicated with the first mounting section (111), both parts of the second magnetic regulating groove (13) are provided with one third magnetic regulating groove (14), and a predetermined distance is provided between the third magnetic regulating groove (14) and the second magnetic regulating groove (13).
14. The motor rotor according to claim 13, characterized in that both ends of the second magnetism regulating groove (13) have a protruding portion protruding from the first mounting section (111), the protruding portion having a width d7, and a length d7 being 2 to 3 times the thickness of the first permanent magnet (21);
the preset distance between the second magnetic regulating groove (13) and the third magnetic regulating groove (14) is d6, and the width of d6 is smaller than the thickness of the first permanent magnet (21);
the widths of the second magnetic regulating groove (13) and the third magnetic regulating groove (14) along the radial direction of the rotor core (10) are d5, and d5 is smaller than the thickness of the first permanent magnet (21).
15. The electric machine rotor according to any one of claims 1 to 14, characterized in that the permanent magnets (20) are ferrite magnets or neodymium-iron-boron magnets.
16. The electric machine rotor according to any one of claims 1 to 14, characterized in that the magnetization directions of adjacent two of the permanent magnets (20) are opposite.
17. The electric motor rotor as recited in any one of claims 1-14, characterized in that the rotor core (10) is a cylindrical rotor core, the outer periphery of the rotor core (10) is provided with a plurality of cut edges (15), and the proportion of the cut edges (15) to the circular arc edges (16) of the outer periphery of the rotor core (10) is 28% ± 5%.
18. An electric machine comprising the electric machine rotor of any one of claims 1 to 17.
19. A compressor comprising the motor of claim 18.
20. A heat pump system comprising the compressor of claim 19.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320639.2A CN109217513B (en) | 2018-11-07 | 2018-11-07 | Motor rotor, motor, compressor and heat pump system |
| PCT/CN2019/106761 WO2020093795A1 (en) | 2018-11-07 | 2019-09-19 | Motor rotor, motor, compressor and heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320639.2A CN109217513B (en) | 2018-11-07 | 2018-11-07 | Motor rotor, motor, compressor and heat pump system |
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| Publication Number | Publication Date |
|---|---|
| CN109217513A CN109217513A (en) | 2019-01-15 |
| CN109217513B true CN109217513B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811320639.2A Active CN109217513B (en) | 2018-11-07 | 2018-11-07 | Motor rotor, motor, compressor and heat pump system |
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| Country | Link |
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| CN (1) | CN109217513B (en) |
| WO (1) | WO2020093795A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217513B (en) * | 2018-11-07 | 2023-10-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor, compressor and heat pump system |
| CN110912304B (en) * | 2019-10-25 | 2021-11-30 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor, compressor and air conditioner |
| CN112531938B (en) * | 2020-11-26 | 2022-04-15 | 珠海格力电器股份有限公司 | Rotor core, rotor, motor, compressor and air conditioner |
| GB2609865A (en) * | 2021-12-31 | 2023-02-15 | Univ Jiangsu | High-performance permanent magnet motor with controllable magnetic field in variable operating conditions, and flux orientation design method and leakage flux |
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| JP2001008391A (en) * | 1999-06-15 | 2001-01-12 | Toyota Motor Corp | Dynamo-electric machine |
| CN102420475A (en) * | 2010-09-27 | 2012-04-18 | 天津市松正电动科技有限公司 | Permanent magnet synchronous motor |
| CN102664474A (en) * | 2012-04-26 | 2012-09-12 | 张学义 | Bi-radial permanent-magnet composite magnetic circuit generator |
| WO2016115722A1 (en) * | 2015-01-23 | 2016-07-28 | 浙江迈雷科技有限公司 | Permanent magnet synchronous motor |
| CN106300730A (en) * | 2015-06-08 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and there is its motor |
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| JP4372798B2 (en) * | 2007-02-13 | 2009-11-25 | アスモ株式会社 | Embedded magnet type motor |
| CN201294443Y (en) * | 2008-12-01 | 2009-08-19 | 东元总合科技（杭州）有限公司 | Permanent magnet self-startup synchronous motor rotor |
| CN101699714A (en) * | 2009-10-30 | 2010-04-28 | 无锡新大力电机有限公司 | Built-in W-shaped installation and squirrel cage combining permanent magnet motor structure |
| JP2014103741A (en) * | 2012-11-19 | 2014-06-05 | Jtekt Corp | Magnet embedded type rotor |
| CN208923938U (en) * | 2018-11-07 | 2019-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor, motor, compressor and heat pump system |
| CN109217513B (en) * | 2018-11-07 | 2023-10-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor, compressor and heat pump system |
-
2018
- 2018-11-07 CN CN201811320639.2A patent/CN109217513B/en active Active
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2019
- 2019-09-19 WO PCT/CN2019/106761 patent/WO2020093795A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001008391A (en) * | 1999-06-15 | 2001-01-12 | Toyota Motor Corp | Dynamo-electric machine |
| CN102420475A (en) * | 2010-09-27 | 2012-04-18 | 天津市松正电动科技有限公司 | Permanent magnet synchronous motor |
| CN102664474A (en) * | 2012-04-26 | 2012-09-12 | 张学义 | Bi-radial permanent-magnet composite magnetic circuit generator |
| WO2016115722A1 (en) * | 2015-01-23 | 2016-07-28 | 浙江迈雷科技有限公司 | Permanent magnet synchronous motor |
| CN106300730A (en) * | 2015-06-08 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and there is its motor |
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| Publication number | Publication date |
|---|---|
| CN109217513A (en) | 2019-01-15 |
| WO2020093795A1 (en) | 2020-05-14 |
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