CN116505686B - Rotor structure for improving heat dissipation performance of outer rotor brushless motor and motor - Google Patents
Rotor structure for improving heat dissipation performance of outer rotor brushless motor and motor Download PDFInfo
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- CN116505686B CN116505686B CN202310755610.1A CN202310755610A CN116505686B CN 116505686 B CN116505686 B CN 116505686B CN 202310755610 A CN202310755610 A CN 202310755610A CN 116505686 B CN116505686 B CN 116505686B
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- motor
- magnetic layer
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- rotor
- heat dissipation
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 36
- 230000007704 transition Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 230000008859 change Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005405 multipole Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/279—Magnets embedded in the magnetic core
-
- 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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model provides a rotor structure for improving heat dissipation performance of an outer rotor brushless motor, which comprises a shell and a magnetic layer, wherein the magnetic layer consists of a magnetic ring or a magnetic strip, the magnetic layer is provided with a plurality of magnetic poles, the magnetic layer comprises N poles and S poles, the N poles and the S poles are sequentially distributed in a staggered manner, the magnetic layer is provided with a magnetic layer groove, the notch of the magnetic layer groove is positioned at the center position of the magnetic poles so as to minimize magnetic field change, and the shell is provided with a shell groove corresponding to the magnetic layer groove. The utility model can make the (outer) rotor of the motor generate obvious heat dissipation air when rotating, continuously and rapidly take away the heat generated in the motor, achieve the effect of optimizing the heat dissipation performance of the motor, ensure the normal operation of the motor, ensure the design parameters of the motor to be further improved, and simultaneously not adopt the scheme of adding fans, so components and the like are not required to be added in the motor, ensure the arrangement of the internal structure of the motor to be complex, and not influence the performance of the motor.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a rotor structure for improving heat dissipation performance of an outer rotor brushless motor and a motor.
Background
The DC brushless motor is composed of a permanent magnet rotor, a multipole winding stator, a position sensor and the like, and adopts a semiconductor switching device to realize electronic commutation, namely the electronic switching device is used for replacing the traditional contact type commutator and the electric brush, and the position sensor is used for carrying out current commutation on the stator winding along a certain sequence according to the change of the rotor position.
In the running process of the direct current brushless motor, heat is continuously gathered along with the increase of running time, the temperature inside the motor is increased very fast, so that the working reliability of internal parts of the motor is influenced, the efficiency of the motor is further influenced, the heat dissipation of the traditional direct current brushless motor is mainly conducted through air, the heat gathered inside the motor is led to the shell, and then the shell of the motor is cooled. In this cooling mode, the heat dissipation in the motor is only by means of heat conduction of air, so that the heat dissipation effect is poor, the temperature in the motor is still higher than that of the outside, and all elements in the motor shell are still in a severe working environment and are easy to damage.
The Chinese patent publication No. CN201937393U discloses a self-radiating brushless DC motor, which comprises a shell, a central shaft penetrating the shell, a stator and a rotor sleeved on the central shaft, wherein a radiating air duct is arranged on the central shaft along the axial direction, an air inlet of the radiating air duct is communicated with the outside of the shell, and an air outlet of the radiating air duct is communicated with the inside of the shell. This scheme is through setting up the heat dissipation wind channel in the center pin inside to and set up structures such as fan, draw forth the heat of inside outside to the motor, reinforcing radiating effect reduces the heat dissipation link, has improved radiating efficiency. Wherein, the inside radiating wind channel that sets up of center pin has increased the manufacturing degree of difficulty, and the motor internal dimension is fairly compact simultaneously, has set up the fan and has increased the arranging degree of difficulty to and phenomenon such as noise increase.
Disclosure of Invention
The purpose of the utility model is that: aiming at the defects in the background art, the rotor structure and the motor for improving the heat dissipation performance of the outer rotor brushless motor are provided, and the scheme can not obviously influence the performance of the motor while obviously improving the heat dissipation effect of the outer rotor motor.
In order to achieve the above purpose, the utility model provides a rotor structure for improving the heat dissipation performance of an outer rotor brushless motor, which comprises a housing and a magnetic layer, wherein the magnetic layer consists of a magnetic ring or a magnetic strip, the magnetic layer is provided with a plurality of magnetic poles, the magnetic layer comprises N poles and S poles, the N poles and the S poles are sequentially distributed in a staggered manner, the magnetic layer is provided with a magnetic layer groove, the notch of the magnetic layer groove is positioned at the center position of the magnetic poles so as to minimize the magnetic field change, and the housing is provided with a housing groove corresponding to the magnetic layer groove.
Further, the number of the magnetic layer grooves is equal to the number of the magnetic poles.
Further, the rotation direction of the magnetic layer grooves is the same as the rotation direction of the rotor.
Further, the magnetic layer grooves are distributed in the radial direction.
Further, the width of the notch of the magnetic layer groove is 2-5 mm.
Further, the deflection angle of the magnetic layer groove is 0-45 degrees.
Further, the housing grooves are provided in a plurality of layers with respect to each of the magnetic layer grooves, and each layer of the housing grooves is distributed in the circumferential direction.
Further, the length of each layer of the housing slot is less than 2mm of the length of the magnetic pole.
The utility model also provides a motor, which comprises a stator and a rotor, wherein the rotor adopts the rotor structure for improving the heat dissipation performance of the outer rotor brushless motor.
The scheme of the utility model has the following beneficial effects:
according to the rotor structure for improving the heat dissipation performance of the outer rotor brushless motor and the motor, through the scheme of slotting on the rotor magnetic layer and the shell, obvious heat dissipation air can be generated when the (outer) rotor of the motor rotates, heat generated in the motor is continuously and rapidly taken away, the effect of optimizing the heat dissipation performance of the motor is achieved, normal operation of the motor is guaranteed, design parameters of the motor can be further improved, meanwhile, a scheme of adding a fan is not adopted, components and the like are not required to be added in the motor, the arrangement of the internal structure of the motor is not required to be complicated, and the performance of the motor is not influenced;
other advantageous effects of the present utility model will be described in detail in the detailed description section which follows.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic diagram of a magnetic layer slot in accordance with the present utility model;
FIG. 3 is a schematic diagram of a magnetic layer slot of the present utility model;
FIG. 4 is a schematic diagram of a magnetic layer slot bi-directional adaptation of the present utility model;
FIG. 5 is a schematic view of the housing structure of the present utility model;
FIG. 6 is a schematic diagram of the magnetic density distribution in the embodiment of the present utility model, wherein (a) is an original scheme and (b) is a scheme;
FIG. 7 is a graph of air gap flux density in accordance with an embodiment of the present utility model.
[ reference numerals description ]
1-a housing; 2-a magnetic layer; 3-a magnetic stripe; 4-magnetic layer grooves; 5-housing slots.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a locked connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model improves the heat radiation performance of a motor, in particular to a direct current brushless motor, which is a structure of an outer rotor and an inner stator, wherein the outer rotor is provided with a magnetic strip 3 as a permanent magnet outer rotor, the outer rotor is connected with a central shaft, a plurality of groups of coils are wound on the inner stator as stator windings, and the current of the stator windings is converted along a certain order through position sensing according to the change of the position of the outer rotor, so that the outer rotor and the central shaft continuously rotate.
As shown in fig. 1, an embodiment of the present utility model provides a rotor structure capable of improving heat dissipation performance of an external rotor brushless motor, which includes a housing 1 and a magnetic layer 2, wherein the magnetic layer 2 is composed of a plurality of magnetic strips 3 or magnetic rings. The magnetic layer 2 has a plurality of magnetic poles, each magnetic pole includes an N pole and an S pole, so the whole magnetic layer 2 has a plurality of N poles and a plurality of S poles, and the N poles and the S poles are sequentially spaced apart, referring to fig. 2.
In order to make the inside of the motor dissipate heat better, as an improvement, in this embodiment, the magnetic layer 2 is provided with the magnetic layer grooves 4, where the magnetic layer grooves 4 are located in the middle of the magnetic poles, and preferably, the middle of each magnetic pole is provided with the magnetic layer grooves 4, that is, the number of the magnetic layer grooves 4 is consistent with that of the magnetic poles, so that on one hand, the number of the magnetic layer grooves 4 is increased as much as possible, the heat dissipation performance is improved, and meanwhile, the magnetic field (magnetic force lines) change can be minimized at the center of the magnetic poles, so that the influence on the performance (rotation speed, noise performance and the like) of the motor is minimized. Correspondingly, the casing 1 is also provided with a casing groove 5 corresponding to the magnetic layer groove 4, so that the whole rotor is in a connection state with the outside through the groove body.
The main difference between the mode and a part of the prior art is that when the rotor rotates, the whole rotor forms a structure similar to a fan, so that a wind field is continuously formed between the rotor and the stator, namely inside the motor, heat generated by the rotation of the motor is rapidly taken away, and the heat dissipation performance of the motor is remarkably improved.
To further enhance the function of the rotor as a fan when rotating, the magnetic layer grooves 4 in this embodiment preferably take the form of a spiral distribution, which is similar to the blades of the fan in a spiral manner. It can also be said that the magnetic layer slot 4 has two slots, one slot is located at the inner layer, and the other slot is located at the outer layer and is in contact with the housing 1, wherein the phase angle of the outer layer slot is different from that of the inner layer slot, and the magnetic layer slot 4 from the inner layer slot to the outer layer slot is in spiral transition, so that larger air flow can be generated inside when the rotor rotates, and the heat dissipation performance is further improved.
It is understood that the rotation direction of the magnetic layer slot 4 needs to be the same as the rotation direction of the rotor, that is, when the motor and the rotor are in a forward rotation arrangement, the magnetic layer slot 4 needs to be in a forward rotation arrangement, as shown in fig. 2; when the motor and the rotor are in reverse rotation, the magnetic layer grooves 4 also need to be in reverse rotation, as shown in fig. 3; thereby ensuring that the highest air quantity can be generated and obtaining the best heat dissipation effect.
It should be noted that, at present, the motor generally has a function of switching between forward rotation and reverse rotation, so the magnetic layer slots 4 may be disposed in a regular square manner instead of a spiral manner, as shown in fig. 4, and the ventilation performance of the arrangement is reduced, but the arrangement can be used for both forward rotation and reverse rotation of the motor or equivalent heat dissipation air flow, so that the heat dissipation performance of the motor under different working conditions is ensured, and the processing is more convenient than the processing.
In this case, since the magnetic layer 2 (magnetic material) of the rotor is modified, it is unavoidable that the motor noise is affected to some extent, and therefore, it is necessary to optimize the electromagnetic noise in terms of magnetic field or the like. In this embodiment, the dimensions of the angle a and the slot width b of the magnetic layer slot 4 are optimized first, so that the angle a is between 0 and 45 ° and the slot width b of the magnetic layer slot 4 is between 2 and 5mm, and the best noise effect on the motor is achieved, as shown in fig. 2. Therefore, in this embodiment, the width of the notch of the magnetic layer groove 4 is preferably 2-5mm, and the deflection angle of the magnetic layer groove 4 is preferably 0-45 degrees.
In the present embodiment, the housing grooves 5 are provided in multiple layers with respect to each of the magnetic layer grooves 4, and each layer of housing grooves 5 is distributed in the circumferential direction. As shown in fig. 5, the dimension D of the housing groove 5 is also optimized, and the heat dissipation effect on the motor is best when the dimension c=d-2 mm, so that the sufficient heat dissipation of the fan structure can be ensured, and the structural strength, noise performance and the like are also within acceptable ranges. In the case where the case groove 5 is formed to coincide with the outer layer opening of the magnetic layer groove 4, the structural strength of the entire case 1 is greatly affected, and thus this is not a preferred embodiment.
In a word, adopt the rotor structure of promotion external rotor brushless motor heat dispersion that this embodiment provided, can produce obvious heat dissipation wind when making the (outer) rotor rotation of motor, take away the heat that the motor is inside continuously, fast, reach the effect of optimizing motor heat dispersion, guaranteed the normal operation of motor, make the design parameter of motor can further promote, the scheme that does not adopt the increase fan simultaneously, consequently need not to increase components and parts etc. in the motor, guaranteed that motor inner structure's arrangement need not to complicate, can not influence the performance of motor self.
In this embodiment, the rationality of the scheme is further demonstrated by software simulation, the original scheme without grooves and the scheme with the magnetic layer grooves 4 and the outer shell grooves 5 are adopted for comparison, fig. 6 shows the analysis of the magnetic density cloud patterns of the two, and by comparison, the tooth part, the yoke part and the like of the stator are not in magnetic saturation phenomenon, and the whole magnetic leakage phenomenon is almost consistent, so that the grooved scheme of the rotor hardly affects the motor performance.
FIG. 7 is a graph showing the comparison of the air gap density of the original scheme and the present scheme to analyze the distortion rate of the air gap density. As can be seen from fig. 7, the original scheme is almost identical to the counter potential waveform, i.e., the sine shape, of the present scheme, so that the present rotor slotting scheme hardly affects motor noise, vibration, etc.
Based on the same inventive concept, the embodiment also provides a motor, which comprises a stator and a rotor, wherein the rotor adopts the rotor structure as described above. The manufactured motor has the same inventive concept and the same beneficial effects as the rotor structure, and is not described herein.
It should be noted that, when the solution provided in this embodiment is suitable for the form of the dc brushless motor and the outer rotor, the inner rotor only rotates inside the motor, so that the inner rotor cannot generate heat dissipation air flow between the inside of the motor and the outside, and thus the heat dissipation effect is not significantly improved.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (6)
1. The rotor structure for improving the heat dissipation performance of the outer rotor brushless motor comprises a shell and a magnetic layer, wherein the magnetic layer consists of a magnetic ring or a magnetic stripe and is provided with a plurality of magnetic poles, the magnetic layer comprises an N pole and an S pole, and the N pole and the S pole are sequentially distributed in a staggered manner; the magnetic layer grooves are in a spiral distribution mode, the magnetic layer grooves are provided with two notches, one notch is positioned in the inner layer, the other notch is positioned in the outer layer and is in contact with the shell, the phase angles of the outer layer notch and the inner layer notch are different, the magnetic layer grooves from the inner layer notch to the outer layer notch are in spiral transition, and the rotation direction of the magnetic layer grooves is the same as that of the rotor; the width of the notch of the magnetic layer groove is 2-5 mm; the deflection angle of the magnetic layer groove is 0-45 degrees.
2. The rotor structure for improving heat dissipation performance of an external rotor brushless motor according to claim 1, wherein the number of the magnetic layer grooves is equal to the number of the magnetic poles.
3. The rotor structure for improving heat dissipation performance of an external rotor brushless motor according to claim 1, wherein the magnetic layer grooves are distributed in a radial direction.
4. The rotor structure for improving heat dissipation performance of an external rotor brushless motor according to claim 1, wherein the housing grooves are provided in a plurality of layers with respect to each of the magnetic layer grooves, and each of the housing grooves is circumferentially distributed.
5. The rotor structure for improving heat dissipation performance of an outer rotor brushless motor as claimed in claim 4, wherein the length of each of the housing grooves is less than 2mm of the length of the magnetic poles.
6. A motor comprising a stator and a rotor, wherein the rotor adopts a rotor structure for improving heat dissipation performance of an external rotor brushless motor according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310755610.1A CN116505686B (en) | 2023-06-26 | 2023-06-26 | Rotor structure for improving heat dissipation performance of outer rotor brushless motor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310755610.1A CN116505686B (en) | 2023-06-26 | 2023-06-26 | Rotor structure for improving heat dissipation performance of outer rotor brushless motor and motor |
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| CN116505686A CN116505686A (en) | 2023-07-28 |
| CN116505686B true CN116505686B (en) | 2023-09-26 |
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| CN202310755610.1A Active CN116505686B (en) | 2023-06-26 | 2023-06-26 | Rotor structure for improving heat dissipation performance of outer rotor brushless motor and motor |
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| KR20220026282A (en) * | 2020-08-25 | 2022-03-04 | 효림산업 주식회사 | In-wheel Motor For Electric Vehicle |
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| JP2005297113A (en) * | 2004-04-09 | 2005-10-27 | Hitachi Koki Co Ltd | Power tool |
| CN201107842Y (en) * | 2006-12-04 | 2008-08-27 | 袁会文 | Disc type switch reluctance motor |
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| CN116505686A (en) | 2023-07-28 |
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