CN211557113U - Rotor assembly and permanent magnet motor with same - Google Patents
Rotor assembly and permanent magnet motor with same Download PDFInfo
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- CN211557113U CN211557113U CN201922100430.1U CN201922100430U CN211557113U CN 211557113 U CN211557113 U CN 211557113U CN 201922100430 U CN201922100430 U CN 201922100430U CN 211557113 U CN211557113 U CN 211557113U
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Abstract
The utility model provides a rotor subassembly and have its permanent-magnet machine. The rotor assembly includes a plurality of rotors, the rotors including: the rotor comprises a rotor core, wherein a plurality of mounting grooves are formed in the peripheral surface of the rotor core; the permanent magnet is embedded into the mounting groove; wherein, the permanent magnets of two adjacent rotors are arranged in a staggered manner. Use the technical scheme of the utility model, can solve the not high technical problem of permanent-magnet machine's among the prior art performance.
Description
Technical Field
The utility model relates to the technical field of electric machines, particularly, relate to a rotor subassembly and have its permanent-magnet machine.
Background
Compared with the common induction motor, the permanent magnet motor has the advantages of small volume, light weight, high power density, easy control and the like. The permanent magnet motor has the characteristics of high performance, high efficiency, high reliability and the like, so that the permanent magnet motor is applied to various occasions, particularly in the household appliance industry. With the improvement of living standard of people, household products such as air conditioners, refrigerators and the like are popularized, a compressor is used as a core component of a refrigerating device, the energy efficiency, the reliability and the automation of the compressor are important indexes for realizing high efficiency, energy conservation and safety, and each performance index of a motor of the compressor directly determines each index of the compressor.
Therefore, how to arrange the rotor assembly to improve the performance of the permanent magnet motor is a matter of consideration for those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rotor subassembly and have its permanent-magnet machine to solve among the prior art permanent-magnet machine's the not high technical problem of performance.
In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor assembly including a plurality of rotors, the rotors including: the rotor comprises a rotor core, wherein a plurality of mounting grooves are formed in the peripheral surface of the rotor core; the permanent magnet is embedded into the mounting groove; wherein, the permanent magnets of two adjacent rotors are arranged in a staggered manner.
Further, the rotor assembly further comprises a first connector and a second connector for connecting the plurality of rotors; the end face of each rotor core is provided with a plurality of mounting holes, each mounting hole comprises a first mounting hole, a second mounting hole and a third mounting hole, when two adjacent rotors are connected, the first connecting piece sequentially penetrates through the first mounting hole of one rotor core and the second mounting hole of the other rotor core, and the second connecting piece sequentially penetrates through the second mounting hole of one rotor core and the third mounting hole of the other rotor core, so that the permanent magnets of the two adjacent rotors are arranged in a staggered mode.
Furthermore, an included angle between the central axis of the mounting hole and the central line of the groove body close to the mounting groove of the mounting hole is theta 2, and an included angle formed by the dislocation of the permanent magnets on the two adjacent rotors is theta, wherein theta is more than theta 2 and less than 2 theta.
Further, the mounting grooves are arranged on the outer peripheral surface of the rotor core at intervals, an included angle between every two adjacent mounting grooves is theta 1, an included angle between the first mounting hole and the second mounting hole is theta 3, and/or an included angle between the second mounting hole and the third mounting hole is theta 3, wherein theta 1 is theta 3+ theta.
Furthermore, the mounting groove is a dovetail groove, and the outer surface of the permanent magnet is matched with the inner surface of the dovetail groove.
Further, the rotor core is formed by clamping a plurality of punched steel plates.
Further, the mounting hole is a riveting hole, and the first connecting piece and/or the second connecting piece are/is a rivet.
Further, the rotor assembly further comprises a first balance pressing plate and a second balance pressing plate, the first balance pressing plate is covered at the first end of the rotor assembly along the axis direction of the rotor assembly, and the second balance pressing plate is covered at the second end of the rotor assembly so as to tightly press the permanent magnets in the axis direction of the rotor assembly.
Further, the first balance pressing plate comprises a first pressing plate and a first balance weight, the first balance weight is arranged on the first pressing plate, and the first pressing plate and the first balance weight are of an integrated structure.
Further, the outer diameter of the first balance pressing plate is smaller than that of the permanent magnet, and the outer diameter of the second balance pressing plate is smaller than that of the permanent magnet.
According to another aspect of the utility model, a permanent-magnet machine is provided, including rotor subassembly and stator module, the rotor subassembly is foretell rotor subassembly.
Use the technical scheme of the utility model, because the permanent magnet dislocation set of two adjacent rotors to make two adjacent rotors form the oblique polar structure, and then effectively weaken the tooth harmonic, reduced the tooth's socket torque and the torque ripple of motor, improved the low-speed steadiness ability of motor, reduced the noise when the motor moves.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural view of an embodiment of a rotor assembly according to the present invention;
FIG. 2 illustrates a front view of the rotor assembly of FIG. 1;
FIG. 3 illustrates an exploded schematic view of the rotor assembly of FIG. 1;
fig. 4 illustrates a structural schematic view of a rotor core of the rotor assembly of fig. 1;
FIG. 5 shows a front view of the rotor core of FIG. 4;
FIG. 6 illustrates a schematic structural view of a first balance pressure plate of the rotor assembly of FIG. 1;
FIG. 7 shows a front view of the first balance pressure plate of FIG. 6;
FIG. 8 illustrates a schematic structural view of the permanent magnets of the rotor assembly of FIG. 1; and
fig. 9 shows a front view of the permanent magnet of fig. 8.
Wherein the figures include the following reference numerals:
10. a rotor; 11. a rotor core; 12. mounting holes; 121. a first mounting hole; 122. a second mounting hole; 123. a third mounting hole; 13. mounting grooves; 14. a permanent magnet; 20. a first connecting member; 30. a second connecting member; 40. a first balance pressing plate; 41. a first platen; 42. a first weight; 50. and a second balance pressure plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 and 2, the present embodiment provides a rotor assembly including a plurality of rotors 10. The rotor 10 includes a rotor core 11 and permanent magnets 14. A plurality of mounting grooves 13 are formed on the outer peripheral surface of the rotor core 11; the permanent magnet 14 is embedded in the mounting groove 13; wherein, the permanent magnets 14 of two adjacent rotors 10 are arranged in a staggered manner.
In this embodiment, the permanent magnets 14 of two adjacent rotors 10 are arranged in a staggered manner, so that two adjacent rotors 10 form an oblique pole structure, thereby effectively weakening the tooth harmonic, reducing the cogging torque and the torque ripple of the motor, improving the low-speed stability of the motor, and reducing the noise of the motor during operation.
As shown in fig. 2 to 5, in the present embodiment, the rotor assembly further includes first and second coupling members 20 and 30 for coupling the plurality of rotors 10; the end surfaces of the rotor cores 11 are provided with a plurality of mounting holes 12, the plurality of mounting holes 12 include a first mounting hole 121, a second mounting hole 122 and a third mounting hole 123, when two adjacent rotors 10 are connected, the first connecting piece 20 sequentially passes through the first mounting hole 121 of one rotor core 11 and the second mounting hole 122 of the other rotor core 11, and the second connecting piece 30 sequentially passes through the second mounting hole 122 of one rotor core 11 and the third mounting hole 123 of the other rotor core 11, so that the permanent magnets 14 of the two adjacent rotors 10 are arranged in a staggered manner.
Specifically, the plurality of mounting holes 12 in the present embodiment penetrate the axial direction of the rotor core 11. Two sets of mounting holes 12 are formed in the rotor core 11, and each set of mounting holes 12 includes a first mounting hole 121, a second mounting hole 122, and a third mounting hole 123. When two adjacent rotors 10 are connected, the first connecting piece 20 passes through the first mounting hole 121 of the previous rotor core 11 and the second mounting hole 122 of the next rotor core 11, and the second connecting piece 30 passes through the second mounting hole 122 of the previous rotor core 11 and the third mounting hole 123 of the next rotor core 11, so that an offset angle is formed between the permanent magnets 14 of the two rotors 10 connected together, and the arrangement of the skewed pole structure of the rotor assembly is realized. The arrangement mode has a simple structure, simplifies the processing technology and is convenient to realize.
As shown in fig. 5, in this embodiment, an included angle between the central axis of the mounting hole 12 and the central line of the groove body of the mounting groove 13 close to the mounting hole 12 is θ 2, and an included angle formed by the permanent magnets 14 on two adjacent rotors 10 being staggered is θ, where θ < θ 2 < 2 θ.
Specifically, the position of the mounting hole 12 is set according to the position of the mounting groove 13. The size of theta 2 is reasonably set according to the required dislocation included angle theta, so that the dislocation included angle theta of the permanent magnets 14 of two adjacent rotors 10 of the assembled rotor assembly is ensured, the cogging torque and the torque pulsation of the motor are reduced, and the performance of the motor is improved.
As shown in fig. 4 and 5, in the present embodiment, the plurality of mounting grooves 13 are spaced apart from each other on the outer circumferential surface of the rotor core 11, an included angle between two adjacent mounting grooves 13 is θ 1, an included angle between the first mounting hole 121 and the second mounting hole 122 is θ 3, and an included angle between the second mounting hole 122 and the third mounting hole 123 is θ 3, where θ 1 is θ 3+ θ.
In this embodiment, when two adjacent rotors 10 are assembled, the first connecting member 20 sequentially passes through the first mounting hole 121 of the previous rotor 10 and the second mounting hole 122 of the next rotor 10, so that the permanent magnet 14 of the previous rotor 10 and the permanent magnet 14 of the next rotor 10 are not overlapped and are offset from each other to form an included angle θ. In this connection mode, the previous rotor 10 rotates by an angle θ 3 relative to the next rotor 10, and since the included angle between two adjacent permanent magnets 14 on the same rotor 10 is θ 1, the included angle θ between two adjacent rotors 10 that are installed in a staggered manner becomes θ 1- θ 3.
Through the arrangement, when the number of stages of the rotor assembly is determined, the included angle between the first mounting hole 121 and the second mounting hole 122 is calculated to be theta 3 according to the required oblique pole included angle theta when the rotor core 11 is processed, so that the oblique pole included angle theta is formed when the rotor assembly is mounted, and the requirement of a motor is met.
Preferably, as shown in fig. 3 to 5, in the present embodiment, the mounting groove 13 is a dovetail groove, and the outer surface of the permanent magnet 14 is fitted to the inner surface of the dovetail groove.
Specifically, as shown in fig. 5, an included angle α is formed between the groove body of the mounting groove 13 and the rotor core 11, and as shown in fig. 8 and 9, an included angle α matching the mounting groove 13 is formed between one side of the permanent magnet 14 facing the rotor core 11 and one side in the radial direction of the rotor.
In the prior art, the permanent magnet is usually adhered to the surface of the rotor core by an adhesive, and the reliability and stability of the motor in the high-speed running process depend on the adhesive force between the permanent magnet and the rotor core. And the operation process in the bonding production. The adhesive strength is affected by the factors such as the using amount and the quality of the adhesive. In addition, high-temperature baking is needed after bonding, the production process is complex, and the production efficiency is low. Along with the long-term operation work of motor, the ageing phenomenon can appear in the gluing agent, and the adhesion weakens gradually, and at the centrifugal force action line of motor, the permanent magnet drops easily, has the potential safety hazard that blocks the rotor and make the unable operation of motor, causes the accident easily.
And the permanent magnet 14 of this embodiment is installed through mounting groove 13, and the permanent magnet 14 after the installation is embedded into mounting groove 13 of rotor core 11, and the installation is simple and intensity is higher, need not to use binder or other connection structure, and the cost is reduced has improved the installation effectiveness, has avoided the potential safety hazard.
When the rotor assembly is installed, the permanent magnets 14 are installed on the rotor core 11 through the installation grooves 13, the permanent magnets 14 are embedded in the installation grooves 13 of the rotor core 11 to form the rotors 10, then when the rotor assembly is assembled, the adjacent rotors 10 are connected through the first connecting piece 20 and the second connecting piece 30, the permanent magnets 14 of the two adjacent rotors 10 are not collinear in the central axis direction of the rotors 10 by selecting different installation holes 12 on the two rotors 10, and an oblique pole structure of the rotor assembly is formed.
Preferably, in the present embodiment, the rotor core 11 is formed by clamping a plurality of punched steel plates.
Specifically, the rotor core 11 is formed by stamping and clamping electrical steel plates with the thickness of 0.35mm or 0.5mm, the stamped steel plates are provided with stamped protrusions and grooves, and a plurality of steel plates are formed by matching and laminating the protrusions and the grooves. The number of projections and recesses may be arranged as desired.
Further, the mounting hole 12 is a riveting hole, and the first and second connectors 20 and 30 are rivets.
The setting process is simple, the cost is low, and the installation and the disassembly are convenient.
As shown in fig. 3, 6 and 7, in the present embodiment, the rotor assembly further includes a first balance pressing plate 40 and a second balance pressing plate 50, the first balance pressing plate 40 is disposed at a first end of the rotor assembly in the axial direction of the rotor assembly, and the second balance pressing plate 50 is disposed at a second end of the rotor assembly in a covering manner to press the permanent magnets 14 in the axial direction of the rotor assembly.
Through the arrangement, the installation strength of the permanent magnet 14 in the axis direction of the rotor assembly is ensured, and the stability of the rotor assembly in the use process of the motor is further ensured.
As shown in fig. 6 and 7, in the embodiment, the first balance pressing plate 40 includes a first pressing plate 41 and a first balance weight 42, and the first balance weight 42 is disposed on the first pressing plate 41, wherein the first pressing plate 41 and the first balance weight 42 are an integrally formed structure.
In order to ensure the normal work of the rotor assembly, a balancing weight needs to be added to the rotor assembly so as to ensure the stability of the rotor assembly in the rotating process. In the prior art, the balance block and the pressing plate for balancing weight are arranged in a split mode, so that more parts are needed, the installation is complex, and the assembly is inconvenient. In the present application, the first pressing plate 41 and the first balance weight 42 are integrally formed to form the first balance pressing plate 40, so as to reduce the number of parts of the rotor assembly, simplify the assembly and installation of the rotor assembly, and make the structure simpler.
Preferably, the second balance pressing plate 50 in the present embodiment includes a second pressing plate and a second balance weight, the second balance weight is disposed on the second pressing plate, and the second pressing plate and the second balance weight are an integrally formed structure.
Further, the first balance pressing plate 40 and the second balance pressing plate 50 are both provided with two mounting through holes, and an included angle between the two mounting through holes is θ 3.
As shown in fig. 1, in the present embodiment, the outer diameter of the first balance pressing plate 40 is smaller than the outer diameter of the permanent magnet 14, and the outer diameter of the second balance pressing plate 50 is smaller than the outer diameter of the permanent magnet 14.
Through the arrangement, the interference between the first balance pressing plate 40 or the second balance pressing plate 50 and the stator assembly due to the overlarge outer diameter of the rotor assembly in the rotating process is avoided, and the safety accidents are avoided. Preferably, the outer diameters of the first balance pressing plate 40 and the second balance pressing plate 50 are set to be larger than the outer diameter of the rotor core 11 so as to press the permanent magnets 14 in the axial direction of the rotor core 11, thereby ensuring the normal operation of the rotor assembly.
The embodiment also provides a permanent magnet motor, which comprises a rotor assembly and a stator assembly, wherein the rotor assembly is the rotor assembly.
In this embodiment, the permanent magnets 14 of two adjacent rotors 10 are arranged in a staggered manner, so that two adjacent rotors 10 form an oblique pole structure, thereby effectively weakening the tooth harmonic, reducing the cogging torque and the torque ripple of the motor, improving the low-speed stability of the motor, and reducing the noise of the motor during operation. Therefore, the permanent magnet motor with the rotor assembly also has the advantages.
Taking an 8-level rotor with permanent magnets uniformly distributed as an example, if the included angle θ 1 between two adjacent permanent magnets 14 is 360 °/8 is 45 °, and if the included angle θ of the oblique poles that needs to be set is 5 °, the included angle θ 3 between two adjacent mounting holes 12 needs to be set to 40 °. The following relationship is required to be satisfied due to the positioning included angle θ 2 of the mounting hole 12: since θ < θ 2 < 2 θ, when the mounting hole 12 is provided, the angle between the central axis of the mounting hole 12 and the central line of the groove body of the mounting groove 13 close to the mounting hole 12 may be set to 5 ° to 10 ° as θ 2.
Of course, in an alternative embodiment not shown, the number of the magnetic poles is not limited to 8, and may be 6, 10, 12, etc., and the setting is performed according to production needs, and only the angle value of θ 1 needs to be changed accordingly.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
because the permanent magnets of the two adjacent rotors are arranged in a staggered mode, the two adjacent rotors form an oblique pole structure, so that tooth harmonic waves are effectively weakened, the cogging torque and the torque pulsation of the motor are reduced, the low-speed stability performance of the motor is improved, and the noise of the motor during operation is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A rotor assembly comprising a plurality of rotors (10), wherein the rotors (10) comprise:
the rotor comprises a rotor core (11), wherein a plurality of mounting grooves (13) are formed in the peripheral surface of the rotor core (11);
the permanent magnet (14) is embedded in the mounting groove (13);
the permanent magnets (14) of two adjacent rotors (10) are arranged in a staggered mode.
2. The rotor assembly according to claim 1, further comprising a first connection (20) and a second connection (30) for connecting the plurality of rotors (10); be equipped with a plurality of mounting holes (12) on the terminal surface of rotor core (11), a plurality of mounting holes (12) include first mounting hole (121), second mounting hole (122) and third mounting hole (123), and when connecting adjacent two when rotor (10), first connecting piece (20) pass one of them rotor core (11) first mounting hole (121) and another rotor core (11) second mounting hole (122), one of them is passed in proper order in second connecting piece (30) rotor core (11) second mounting hole (122) and another rotor core (11) third mounting hole (123) to make adjacent two rotor (10) permanent magnet (14) dislocation set.
3. The rotor assembly according to claim 2, wherein an included angle between a central axis of the mounting hole (12) and a central line of a groove body of the mounting groove (13) close to the mounting hole (12) is theta 2, and an included angle formed by dislocation of the permanent magnets (14) on two adjacent rotors (10) is theta, wherein theta is more than theta 2 and less than 2 theta.
4. The rotor assembly according to claim 3, wherein the plurality of mounting grooves (13) are spaced apart from each other on the outer circumferential surface of the rotor core (11), an included angle between two adjacent mounting grooves (13) is θ 1, an included angle between the first mounting hole (121) and the second mounting hole (122) is θ 3, and/or an included angle between the second mounting hole (122) and the third mounting hole (123) is θ 3, where θ 1 + θ 3.
5. The rotor assembly according to claim 1, wherein the mounting slot (13) is a dovetail slot, and the outer surface of the permanent magnet (14) is fitted with the inner surface of the dovetail slot.
6. The rotor assembly according to claim 1, wherein the rotor core (11) is snap formed from a plurality of stamped steel plates.
7. The rotor assembly according to claim 2, wherein the mounting hole (12) is a riveting hole and the first connector (20) and/or the second connector (30) is a rivet.
8. The rotor assembly of claim 1, further comprising a first balance pressing plate (40) and a second balance pressing plate (50), wherein the first balance pressing plate (40) is covered at a first end of the rotor assembly and the second balance pressing plate (50) is covered at a second end of the rotor assembly along the axial direction of the rotor assembly to press the permanent magnets (14) in the axial direction of the rotor assembly.
9. The rotor assembly of claim 8, wherein the first balancing pressure plate (40) comprises a first pressure plate (41) and a first balancing mass (42), the first balancing mass (42) being disposed on the first pressure plate (41), wherein the first pressure plate (41) and the first balancing mass (42) are of unitary construction.
10. The rotor assembly of claim 8, wherein the first balancing pressure plate (40) has an outer diameter smaller than an outer diameter of the permanent magnet (14), and the second balancing pressure plate (50) has an outer diameter smaller than an outer diameter of the permanent magnet (14).
11. A permanent magnet electric machine comprising a rotor assembly and a stator assembly, wherein the rotor assembly is as claimed in any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922100430.1U CN211557113U (en) | 2019-11-27 | 2019-11-27 | Rotor assembly and permanent magnet motor with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922100430.1U CN211557113U (en) | 2019-11-27 | 2019-11-27 | Rotor assembly and permanent magnet motor with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211557113U true CN211557113U (en) | 2020-09-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922100430.1U Active CN211557113U (en) | 2019-11-27 | 2019-11-27 | Rotor assembly and permanent magnet motor with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211557113U (en) |
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2019
- 2019-11-27 CN CN201922100430.1U patent/CN211557113U/en active Active
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