CN220711195U - Surface-mounted permanent magnet structure of outer rotor permanent magnet motor - Google Patents
Surface-mounted permanent magnet structure of outer rotor permanent magnet motor Download PDFInfo
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- CN220711195U CN220711195U CN202322302226.4U CN202322302226U CN220711195U CN 220711195 U CN220711195 U CN 220711195U CN 202322302226 U CN202322302226 U CN 202322302226U CN 220711195 U CN220711195 U CN 220711195U
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- 239000000463 material Substances 0.000 claims abstract description 7
- 239000012779 reinforcing material Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical group 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model discloses a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor, which comprises a rotor yoke, wherein at least 2 circumferential permanent magnet combination rings which are axially distributed at intervals are stuck to the inner wall surface of the rotor yoke, each single circumferential permanent magnet combination ring comprises a plurality of permanent magnet units which are stuck to the inner wall surface of the rotor yoke and are uniformly distributed at intervals in the circumferential direction, and the polarities of adjacent permanent magnet units in each single circumferential permanent magnet combination ring are different; the permanent magnet motor has the advantages that the permanent magnet is ensured to be stably and reliably adhered to the rotor yoke part, the structure is simple, the simplicity is realized, the material cost of the permanent magnet is saved, and the working performance of the permanent magnet motor applying the outer rotor permanent magnet motor is improved.
Description
Technical Field
The utility model belongs to the field of outer rotor permanent magnet motors, and particularly relates to a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor.
Background
The permanent magnet is used as one of main structures of the outer rotor permanent magnet motor, and is adhered to a rotor of the outer rotor permanent magnet motor in various fixing modes. Since the adhesion strength of the permanent magnet is greatly affected by high temperature, the method is specifically expressed as follows: the permanent magnet is influenced by high temperature to cause demagnetization, and the demagnetized permanent magnet has a larger influence on the performance attenuation of the motor. As the application range of the outer rotor permanent magnet motor is wider and wider, the outer rotor permanent magnet motor (especially a high-power permanent magnet motor) has relatively high requirements on motor performance and temperature rise control, so the performance of the permanent magnet of the outer rotor permanent magnet motor is one of the key factors for determining the motor performance.
The permanent magnet of the existing outer rotor permanent magnet motor mainly comprises the following fixing modes:
the first method is that permanent magnets are fully attached to the inner peripheral wall of a rotor (specifically, the whole inner peripheral wall of the rotor is fully attached to the permanent magnets in a ring shape), the S poles and the N poles of adjacent permanent magnets are closely adsorbed together, however, the magnetic leakage phenomenon occurs at the attraction position of the S poles and the N poles, so that counter potential harmonic waves of a motor are overlarge, and finally, the magnetic resonance of the motor is overlarge to cause the increase of the failure rate.
The second is to design and process equally-divided bars on the inner peripheral wall of the rotor, and inlay the permanent magnets into the two bars, which can also be called as indirect permanent magnets, but because the consistency and accuracy of the equally-divided distance between the bars and the width dimension of the permanent magnets are difficult to control in batches, the permanent magnets are easy to be ejected out due to radial force generated between two adjacent permanent magnets when the two adjacent permanent magnets cannot be closely abutted together, so that permanent magnet falling-off phenomenon often occurs.
The third is: most permanent magnets spliced in the axial direction of two or more permanent magnets are tightly abutted together by adopting permanent magnets with the same polarity on two sides, so that the two permanent magnets with the same polarity always have repulsive thrust, and when the time is long or the motor is in a high-temperature state, after the adhesive strength of the adhesive for adhering the permanent magnets is weakened, the adhesive permanent magnets are easy to loosen, and the problem that the permanent magnets fall off occurs.
Accordingly, the applicant has sought to improve upon the above technical problems.
Disclosure of Invention
In view of the above, the utility model aims to provide a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor, which ensures that a permanent magnet is stably and reliably adhered to a rotor yoke, has a simple structure, is easy and simple, saves the material cost of the permanent magnet, and improves the working performance of the outer rotor permanent magnet motor.
The technical scheme adopted by the utility model is as follows:
the utility model provides a surface mounted permanent magnet structure of external rotor permanent magnet motor, external rotor permanent magnet motor includes rotor yoke, rotor yoke's internal face is pasted and is the circumference permanent magnet combination ring that axial interval distributes at least 2, and wherein, single circumference permanent magnet combination ring is including pasting at rotor yoke's internal face and be a plurality of permanent magnet units that circumference evenly distributes at intervals, and in single circumference permanent magnet combination ring, the polarity of adjacent permanent magnet unit is different.
Preferably, the permanent magnet units in adjacent circumferential permanent magnet combination rings are arranged in a flush manner in the axial direction; wherein the permanent magnet units in a single circumferential permanent magnet combination ring have the same polarity as the permanent magnet units in the corresponding positions in the adjacent circumferential permanent magnet combination ring.
Preferably, in a single circumferential combined ring of permanent magnet, the spacing between adjacent permanent magnet units is at least 8%, preferably 10-35% of the width of the single permanent magnet unit.
Preferably, the spacing between adjacent circumferential permanent magnet composite rings is not less than 0.8mm, preferably 1-3.5 mm.
Preferably, the number of the circumferential permanent magnet combination rings is 2-5.
Preferably, all the permanent magnet units are identical in material and size, and the distances between every two adjacent circumferential permanent magnet combination rings are equal.
Preferably, reinforcing materials are filled in the circumferential gaps between adjacent permanent magnet units in the single circumferential permanent magnet combination ring, and the reinforcing materials are used for achieving the pasting reinforcing effect of the permanent magnets on the rotor yoke; and/or filling reinforcing materials in the axial gaps between the adjacent circumferential permanent magnet combination rings, so as to realize the pasting reinforcing effect of the permanent magnets on the rotor yoke.
Preferably, a reinforcing material is filled in a gap between the rotor yoke and the circumferential permanent magnet combination ring, so as to achieve an adhesive reinforcing effect on the permanent magnets on the rotor yoke.
Preferably, the permanent magnet unit adopts rare earth permanent magnets.
Preferably, at least one end face of the rotor yoke is provided with a mounting hole for mounting an end cap.
According to the utility model, the plurality of permanent magnet units which are respectively distributed at intervals in the circumferential direction and in the axial direction are stuck on the inner surface of the rotor yoke part, so that a unique multi-section surface-mounted permanent magnet structure is formed, the problems of high cost, high requirement on workpiece size and high automation difficulty in the traditional permanent magnet full-mounted arrangement and sticking mode are avoided, and the problem of high back electromotive force harmonic wave (large magnetic noise) of the motor caused by the existence of a magnetic leakage phenomenon is avoided; the harsh process requirement of excessively high requirements on the dimension precision of the parting strips and the permanent magnets in the inter-mounted permanent magnet structure is avoided, and the permanent magnet units can be ensured to be stably and reliably stuck on the inner wall surface of the rotor yoke part; in addition, under the conditions of the same coercive force and the same volume of the permanent magnets, the high-temperature demagnetizing rate of the permanent magnets is inversely proportional to the heated area of the permanent magnets, and compared with the traditional full-pasting mode of the permanent magnets, the multi-section surface-pasting permanent magnet structure has the advantages that the heated area of a single permanent magnet unit is obviously reduced, so that the high-temperature demagnetizing rate of the multi-section surface-pasting permanent magnet structure is correspondingly reduced, and the temperature resistance grade performance of the multi-section surface-pasting permanent magnet structure is forcefully improved; and under the condition of adopting the same volume and the same permanent magnet material, compared with a close adhesion mode of the permanent magnet, the multi-section surface-mounted permanent magnet structure provided by the application has more excellent surface magnetism and total permeability performance.
Drawings
Fig. 1 is a schematic diagram of a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to an embodiment of the present utility model;
FIG. 2 is a schematic side elevational view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
fig. 4 is a cross-sectional view of fig. 3 in the A-A direction (the polarity of some of the permanent magnet units are labeled).
Detailed Description
The embodiment of the utility model discloses a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor, which comprises a rotor yoke, wherein at least 2 circumferential permanent magnet combination rings which are axially distributed at intervals are stuck to the inner wall surface of the rotor yoke, each single circumferential permanent magnet combination ring comprises a plurality of permanent magnet units which are stuck to the inner wall surface of the rotor yoke and are uniformly distributed at intervals in the circumferential direction, and the polarities of adjacent permanent magnet units in each single circumferential permanent magnet combination ring are different.
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, a surface-mounted permanent magnet structure of an outer rotor permanent magnet motor, the outer rotor permanent magnet motor includes a rotor yoke 1 (specifically, a rotor ring obtained by processing and forming an iron plate or a steel plate), at least 2 circumferential permanent magnet combination rings 10 distributed at intervals in an axial direction are adhered to an inner wall surface of the rotor yoke 1, wherein a single circumferential permanent magnet combination ring 10 includes a plurality of permanent magnet units 11 adhered to the inner wall surface of the rotor yoke 1 and distributed at intervals in a circumferential direction uniformly, and in the single circumferential permanent magnet combination ring 10, polarities of adjacent permanent magnet units 11 are different (as shown in fig. 4, the adjacent permanent magnet units 11 are N-pole, S-pole, N-pole, and S-pole arranged in sequence); preferably, in order to facilitate the adhesion reliability of the permanent magnet units 11 and the motor power density, in the present embodiment, the permanent magnet units 11 in adjacent circumferential permanent magnet combination rings 10 are arranged flush in the axial direction; wherein the permanent magnet units 11 in a single circumferential permanent magnet combination ring 10 have the same polarity as the permanent magnet units 11 in the corresponding positions in its adjacent circumferential permanent magnet combination ring 10 (see in particular fig. 4); preferably, in the present embodiment, all the permanent magnet units 11 are the same in material and size, and the intervals between every two adjacent circumferential permanent magnet combination rings 10 are equal, and the permanent magnet units 1 are rare earth permanent magnets; in particular, in the present embodiment, the permanent magnet unit 11 is preferably rectangular in shape, having a width in the circumferential direction and a length in the axial direction.
Preferably, in order to facilitate the mounting connection between the rotor yoke 10 and the motor end cover, in the present embodiment, both end surfaces of the rotor yoke 10 are provided with mounting holes 12 (specifically screw holes) for mounting the end cover.
In the present embodiment, the number of the permanent magnet units 10 in the single circumferential permanent magnet composite ring 10 is determined according to the number of slots and the number of winding coil units of the stator coil of the outer rotor permanent magnet motor to which it is applied, which belongs to the common general knowledge of those skilled in the art, and the present embodiment is not limited thereto; in the present embodiment, the number of the circumferential permanent magnet combination rings 10 is determined according to the total length requirement of the permanent magnet units 11 in combination with the molding process of the permanent magnet units 11 to achieve the highest cost performance, which belongs to the common general knowledge of those skilled in the art, and the present embodiment is not limited thereto; preferably, in the present embodiment, the number of the circumferential permanent magnet combination rings 10 is 2 to 5 (the present example illustrates 3 circumferential permanent magnet combination rings 10).
Preferably, in order to avoid the problem of magnetic leakage and to ensure the reliability of the attachment of the permanent magnet units 11 to the rotor yoke 1, in the present embodiment, the spacing D11 of adjacent permanent magnet units 11 in the single circumferential permanent magnet composite ring 10 is at least 8%, preferably 10-35%, more preferably 10% -25% of the single permanent magnet unit width W; it is further preferable that in the present embodiment, a reinforcing material (not shown in the drawings, specifically, epoxy resin or other similar resin or encapsulation glue may be used to fill the circumferential gaps between the adjacent permanent magnet units 11 in the single circumferential permanent magnet composite ring 10, and the reinforcing material is cured after being poured to achieve the adhesion reinforcing effect), so as to achieve the adhesion reinforcing effect on the rotor yoke portion 1 for the permanent magnet units 11.
Preferably, in order to ensure the reliability of the attachment of the permanent magnet units 11 to the rotor yoke 1, to avoid the permanent magnet units 11 being ejected due to the repulsive force, in the present embodiment, the distance D10 between adjacent circumferential permanent magnet combination rings 10 is not less than 0.8mm, preferably 1 to 3.5mm, more preferably 1.5mm to 3mm; it is further preferable that in the present embodiment, a reinforcing material (not shown in the drawings, specifically, epoxy resin or other similar resin or encapsulation glue is used to fill the axial gap between the adjacent circumferential permanent magnet assembly rings 10, and the reinforcing material is cured after pouring to achieve the adhesion reinforcing effect), so as to achieve the adhesion reinforcing effect on the rotor yoke portion 1 of the permanent magnet unit 11.
It is further preferable that in the present embodiment, a reinforcing material (specifically, epoxy resin or other similar resin or encapsulation glue may be used) is filled in the gap between the rotor yoke 1 and the circumferential permanent magnet composite ring 10, and the reinforcing material is cured after pouring to achieve the adhesion reinforcing effect, so as to achieve the adhesion reinforcing effect on each permanent magnet unit 11 on the rotor yoke 1.
According to the embodiment, the plurality of permanent magnet units 11 which are respectively distributed at intervals in the circumferential direction and in the axial direction are stuck on the inner surface of the rotor yoke part 1, so that a unique multi-section surface-mounted permanent magnet structure is formed, the problems of high cost, high requirement on workpiece size and high automation difficulty in the traditional permanent magnet full-mounted arrangement sticking mode are avoided, and the problem of high counter potential harmonic wave (high magnetic noise) of a motor caused by the existence of a magnetic leakage phenomenon is avoided; the harsh process requirement of excessively high requirements on the parting bead and the dimensional accuracy of the permanent magnet in the inter-mounted permanent magnet structure is avoided, and the permanent magnet unit 11 can be ensured to be stably and reliably stuck on the inner wall surface of the rotor yoke part 1; in addition, under the conditions of the same coercive force and the same volume of the permanent magnet, the high-temperature demagnetizing rate of the permanent magnet is inversely proportional to the heated area of the permanent magnet, and compared with the traditional full-pasting mode of the permanent magnet, the heating area of a single permanent magnet unit 11 of the multi-section surface-pasting permanent magnet structure is obviously reduced, so that the high-temperature demagnetizing rate of the multi-section surface-pasting permanent magnet structure is correspondingly reduced, and the temperature resistance grade performance of the multi-section surface-pasting permanent magnet structure is forcefully improved; and under the condition of adopting the same volume and the same permanent magnet material, compared with a close adhesion mode of the permanent magnet, the multi-section surface-mounted permanent magnet structure provided by the embodiment has more excellent surface magnetism and total permeability performance.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (12)
1. The utility model provides a surface mounted permanent magnet structure of external rotor permanent magnet motor, external rotor permanent magnet motor includes rotor yoke, its characterized in that, rotor yoke's internal face is pasted has 2 at least circumference permanent magnet combination rings that are axial interval distribution, and wherein, single circumference permanent magnet combination ring is including pasting in rotor yoke's internal face and be a plurality of permanent magnet units that circumference evenly interval distributes, and in single circumference permanent magnet combination ring, the polarity of adjacent permanent magnet unit is different.
2. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein the permanent magnet units in adjacent circumferential permanent magnet combination rings are arranged in a flush manner in the axial direction; wherein the permanent magnet units in a single circumferential permanent magnet combination ring have the same polarity as the permanent magnet units in the corresponding positions in the adjacent circumferential permanent magnet combination ring.
3. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 1, wherein in the single circumferential permanent magnet combination ring, the spacing between adjacent permanent magnet units is at least 8% of the width of the single permanent magnet unit.
4. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein in the single circumferential permanent magnet combination ring, the spacing between adjacent permanent magnet units is at least 10-35% of the width of the single permanent magnet unit.
5. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein a spacing between adjacent circumferential permanent magnet combination rings is not less than 0.8mm.
6. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein a distance between adjacent circumferential permanent magnet combination rings is 1-3.5mmm.
7. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein the number of the circumferential permanent magnet combination rings is 2-5.
8. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein all permanent magnet units are identical in material and size, and the distances between every two adjacent circumferential permanent magnet combination rings are equal.
9. The surface-mounted permanent magnet structure of the outer rotor permanent magnet motor according to claim 1, wherein a reinforcing material is filled in a circumferential gap between adjacent permanent magnet units in a single circumferential permanent magnet combination ring for realizing a pasting reinforcing effect of a permanent magnet on the rotor yoke; and/or filling reinforcing materials in the axial gaps between the adjacent circumferential permanent magnet combination rings, so as to realize the pasting reinforcing effect of the permanent magnets on the rotor yoke.
10. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1 or 9, wherein a reinforcing material is filled in a gap between the rotor yoke and the circumferential permanent magnet combination ring for achieving a bonding reinforcing effect of a permanent magnet on the rotor yoke.
11. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein the permanent magnet unit is a rare earth permanent magnet.
12. The surface-mounted permanent magnet structure of an outer rotor permanent magnet motor according to claim 1, wherein at least one end face of the rotor yoke is provided with a mounting hole for mounting an end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322302226.4U CN220711195U (en) | 2023-08-26 | 2023-08-26 | Surface-mounted permanent magnet structure of outer rotor permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322302226.4U CN220711195U (en) | 2023-08-26 | 2023-08-26 | Surface-mounted permanent magnet structure of outer rotor permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220711195U true CN220711195U (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322302226.4U Active CN220711195U (en) | 2023-08-26 | 2023-08-26 | Surface-mounted permanent magnet structure of outer rotor permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220711195U (en) |
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2023
- 2023-08-26 CN CN202322302226.4U patent/CN220711195U/en active Active
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