CN215009795U - External rotor motor - Google Patents
External rotor motor Download PDFInfo
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- CN215009795U CN215009795U CN202121594923.6U CN202121594923U CN215009795U CN 215009795 U CN215009795 U CN 215009795U CN 202121594923 U CN202121594923 U CN 202121594923U CN 215009795 U CN215009795 U CN 215009795U
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Abstract
The utility model relates to an external rotor electric machine, include: rotor portion, stator portion and locating component. The rotor part comprises a rotor shell with a hollow accommodating cavity, a shaft arranged at the center of the rotor shell, and a main magnetic ring arranged on the wall of an inner cavity of the accommodating cavity along the circumferential direction; the stator part is arranged in the accommodating cavity in a mode of being opposite to the main magnetic ring and comprises a bracket and a stator component fixedly arranged on the bracket; and the positioning assembly comprises a first magnetic element structure arranged on the inner cavity wall of the accommodating cavity along the circumferential direction and a second magnetic element structure arranged in the accommodating cavity in a manner of being opposite to the first magnetic element structure. The utility model discloses can effectively increase external rotor electric machine's holding torque.
Description
Technical Field
The utility model relates to the technical field of electric machines, particularly, relate to an external rotor electric machine.
Background
Research on the technical problem of controlling the ability of a motor to stop to a correct stop position after a power failure has been one of the focuses of the electromechanical industry.
Conventionally, in order to increase the holding torque of a motor, as in patent JP2007143289A, three types of pole teeth are prepared in a stator yoke, the area of which is changed by the height and width of the pole teeth, and the pole teeth are combined and arranged at a predetermined angular offset, thereby increasing the holding torque. However, the stator yoke is a component that directly affects the rotational drive of the motor, and has a large influence on other characteristics of the motor. Therefore, the stator yoke is provided with the pole teeth for increasing the holding torque, so that the rotational torque of the motor is greatly reduced, and even if the holding torque is increased, the original characteristics of the motor are reduced.
In addition, in order to increase the holding torque of the motor, a scheme is provided in which a salient pole piece with a corresponding number of poles is fixed on the stator, as in patent CN102742126B, positioning torque is generated by the action of pole shoes of the stopping torque plate and corresponding magnets on the rotor component, but the pole shoes on the stopping torque plate are limited by the size, the number of pole shoes is limited, the generated positioning torque is small, and the positioning accuracy is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an external rotor electric machine to solve the technical problem who increases external rotor electric machine's holding torque.
The utility model discloses an external rotor electric machine realizes like this:
an external rotor electric machine comprising:
the rotor part comprises a rotor shell with a hollow accommodating cavity, a shaft arranged at the center of the rotor shell, and a main magnetic ring arranged on the wall of an inner cavity of the accommodating cavity along the circumferential direction;
a stator part which is arranged in the accommodating cavity in a manner of being opposite to the main magnetic ring and comprises a bracket and a stator component fixedly arranged on the bracket; and
the positioning assembly comprises a first magnetic element structure arranged on the inner cavity wall of the containing cavity along the circumferential direction, and a second magnetic element structure arranged in the containing cavity in a mode of being opposite to the first magnetic element structure.
In an alternative embodiment of the present invention, the first magnetic element structure is in contact with or separated from an axially opposite end surface of the main magnetic ring.
In an alternative embodiment of the present invention, the first magnetic element structure and the main magnetic ring have the same or different number of poles.
In an alternative embodiment of the present invention, the first magnetic element structure has an integer multiple of the number of poles of the second magnetic element structure.
In an alternative embodiment of the present invention, a bearing structure adapted to support the free rotation of the shaft is disposed between the inner cavity of the bracket and the outer wall of the shaft.
In an alternative embodiment of the present invention, the second magnetic element structure is carried on a support; the support member is fixedly mounted on the bracket.
In an alternative embodiment of the present invention, the supporting member is made of a magnetic conductive material or a non-magnetic conductive material.
In an alternative embodiment of the present invention, the second magnetic element structure is embedded inside the support member.
In an alternative embodiment of the present invention, the second magnetic element structure is externally embedded on a circumferential outer sidewall of the supporting member.
In an alternative embodiment of the present invention, the second magnetic element structure and/or the first magnetic element structure is an integrally formed magnetic ring structure.
In an alternative embodiment of the present invention, the second magnetic element structure and/or the first magnetic element structure is a plurality of magnetic bodies distributed in a ring shape.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has: the utility model discloses an external rotor electric machine, positioning assembly adopt the magnetic coupling between first magnetic element structure and the second magnetic element structure to produce positioning torque.
Furthermore, the supporting piece is made of a non-magnetic material, so that no magnetic interference exists between the stator winding in the stator assembly and the positioning assembly, the rotating torque of the motor during power-on operation cannot be reduced due to magnetic leakage of the stator winding, and the positioning torque between the first magnetic element structure and the second magnetic element structure in the positioning assembly cannot be reduced due to magnetic leakage.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 shows a schematic overall structure diagram of an external rotor electric machine according to the present invention;
fig. 2 is a schematic cross-sectional structural view of an outer rotor motor provided in embodiment 1 of the present invention;
fig. 3 shows an explosion structure diagram of the external rotor electric machine provided in embodiment 1 of the present invention;
fig. 4 shows a schematic diagram of a second magnetic element structure and a supporting member of an outer rotor motor provided in embodiment 1 of the present invention;
fig. 5 is a schematic diagram illustrating a second magnetic element structure of an outer rotor motor provided in embodiment 2 of the present invention and a supporting member;
fig. 6 shows a schematic diagram of a second magnetic element structure and a supporting member of an outer rotor motor provided in embodiment 3 of the present invention;
fig. 7 is a schematic view showing that the first magnetic element structure of the external rotor electric machine of the present invention is an integrally formed magnetic ring structure, and the second magnetic element structure is a plurality of magnetic bodies distributed in a ring shape;
fig. 8 shows that the second magnetic element structure of the external rotor electric machine of the present invention is an integrally formed magnetic ring structure, and the first magnetic element structure is a schematic diagram of a plurality of magnetic bodies distributed in a ring shape;
fig. 9 is a schematic view showing that the second magnetic element structure and the first magnetic element structure of the outer rotor motor of the present invention are a plurality of magnetic bodies distributed in an annular shape.
In the figure: the rotor comprises a rotor case 1, a containing cavity 11, a shaft 12, a rotor hub 13, a bracket 21, a stator assembly 22, a main magnetic ring 3, a bearing structure 4, a first magnetic element structure 5, a second magnetic element structure 6, a support 7, a circular bottom plate 71, an annular side plate 72, a columnar body 73, an annular bottom support 75, a magnetic ring structure 8, a magnetic body 9, a PCB 101 and a mounting plate 102.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Example 1:
referring to fig. 1 to 4 and 7 to 9, the present embodiment provides an outer rotor motor including: the stator portion, locate the rotor portion of stator portion outside to and locate the locating component in rotor portion.
Specifically, the rotor unit includes a rotor housing 1 having a hollow housing chamber 11, a shaft 12 provided at the center of the rotor housing 1, and a main magnetic ring 3 provided on the inner chamber wall of the housing chamber 11 in the circumferential direction; the main magnetic ring 3 and the shaft 12 can rotate synchronously with the rotor housing 1.
It should be noted that one axial end of the rotor casing 1 is an open end communicating with the accommodating cavity 11, and the other axial end of the rotor casing 1 is a closed end. The shaft 12 is assembled and fixed with the center of the closed end of the rotor casing 1, where the shaft 12 may be a structure integrally formed with the closed end of the rotor casing 1, or an assembly structure formed by mating other components, and this embodiment is not limited in any way. The present embodiment is illustrated in the case where a rotor hub 13 for connecting a shaft 12 is provided at the closed end of the rotor case 1.
A stator part which is arranged in the accommodating cavity 11 in a way of facing the main magnetic ring 3, wherein the specific stator part comprises a bracket 21 and a stator assembly 22 fixedly arranged on the bracket 21; the stator assembly 22 herein may alternatively be constructed of a conventional stator assembly 22 of known art, and generally includes a stator core, a bobbin, and coil windings. In the present embodiment, the stator assembly 22 is disposed in the accommodating cavity 11 in a manner of facing the main magnetic ring 3, so that the main magnetic ring 3 and the magnetic field generated by the coil winding of the stator assembly 22 are coupled to form a rotational torque. Based on this structure, a bearing structure 4 suitable for freely rotating the shaft 12 is arranged between the inner cavity of the bracket 21 and the outer wall of the shaft 12, and the bearing structure 4 can be a pair or two, so that the shaft 12 can smoothly rotate relative to the bracket 21.
It should be noted here that the axial depth of the receiving cavity 11 inside the rotor casing 1 of the present embodiment is greater than the axial length of the stator assembly 22 and the main magnetic ring 3, so as to reserve a space in the axial direction inside the receiving cavity 11 for installing the positioning assembly.
In detail, the positioning assembly of the present embodiment includes a first magnetic element structure 5 disposed on the inner cavity wall of the receiving cavity 11 along the circumferential direction, and a second magnetic element structure 6 disposed in the receiving cavity 11 in a manner opposite to the first magnetic element structure 5. The detent torque is generated here by magnetic coupling between the first magnetic element structure 5 and the second magnetic element structure 6.
For the first magnetic element structure 5 of the present embodiment, the fixing manner between the first magnetic element structure 5 and the receiving cavity 11 may be selected from the fixing manner between the main magnetic ring 3 and the receiving cavity 11, such as but not limited to adhesion.
On the basis of the above structure, the number of poles of the first magnetic element structure 5 and the main magnetic ring 3 may be the same or different, and the specific sizes of the first magnetic element structure 5 and the main magnetic ring 3 may be the same or different, that is, the positioning torque generated by the magnetic coupling between the first magnetic element structure 5 and the second magnetic element structure 6 is realized independent of the main magnetic ring 3, so that the first magnetic element structure 5 and the main magnetic ring 3 may be in a structure absolutely independent of each other and exist in the accommodating cavity 11 of the rotor housing 1.
Based on the above, it should be noted that the axially opposite end surfaces of the first magnetic element structure 5 and the main magnetic ring 3 of the present embodiment may be in contact with each other or separated from each other. Here, in the case where the first magnetic element structure 5 is in contact with the axially opposite end surface of the main magnetic ring 3, the first magnetic element structure 5 and the main magnetic ring 3 may be made to adopt an integral structure, so as to simplify the assembly procedure between the first magnetic element structure 5 and the main magnetic ring 3 and the rotor case 1.
In addition, regarding the specific shapes of the second magnetic element structure 6 and the first magnetic element structure 5 of the present embodiment, the following four cases are all satisfied with the use requirement of the present embodiment, specifically:
in the first case, the second magnetic element structure 6 and the first magnetic element structure 5 are both integrally formed magnetic ring structures 8, and the integrally formed magnetic ring structures 8 are adopted, so that the assembly is convenient.
In the second case, the second magnetic element structure 6 and the first magnetic element structure 5 are both a plurality of magnetic bodies 9 distributed annularly, and the plurality of magnetic bodies 9 distributed annularly are adopted, so that compared with the integrally formed magnetic ring structure 8, the usage amount of magnetic materials is low, the material cost is low, but the assembly is relatively complicated.
In the third case, the second magnetic element structure 6 is an integrally formed magnetic ring structure 8, and the first magnetic element structure 5 is a plurality of magnetic bodies 9 distributed in a ring shape.
In the fourth case, the first magnetic element structure 5 is an integrally formed magnetic ring structure 8, and the second magnetic element structure 6 is a plurality of magnetic bodies 9 distributed in a ring shape.
On the basis of the above structure, the magnitude of the positioning torque generated between the first magnetic element structure 5 and the second magnetic element structure 6 is freely designed by the air gap and the height between the first magnetic element structure 5 and the second magnetic element structure 6, and the universal range is wider. The positioning torque generated under the same size condition is larger, the designed pole number under the same size condition is more, the positioning resolution is higher, and the precision is higher. The first magnetic element structure 5 has an integer multiple of the number of poles of the second magnetic element structure 6, and preferably, the number of poles of the first magnetic element structure 5 is the same as that of the second magnetic element structure 6, and the number of poles is designed according to the positioning accuracy. For example, the first magnetic element structure 5 and the second magnetic element structure 6 can be 10 poles, 12 poles, 14 poles, and 16 poles; and the air gap between the two is 0.3-2.5 mm, and the height is 1.5-5 mm.
The positioning of the second magnetic element structure 6 in the accommodating cavity 11 of the rotor housing 1 according to the present embodiment is realized by the following structure:
the second magnetic element structure 6 is loaded on a support 7; the supporting member 7 is fixedly mounted on the bracket 21, and the supporting member 7 is made of magnetic conductive material such as cold-rolled sheet or iron, and is made of non-magnetic conductive material such as aluminum or copper or plastic. Preferably, the supporting member 7 is made of non-magnetic material, so that the rotation torque of the motor during the operation of the motor will not be reduced by the leakage of the stator winding, and the positioning torque between the first magnetic element structure 5 and the second magnetic element structure 6 in the positioning assembly will not be reduced by the leakage of the magnetic flux.
Based on the above, the second magnetic element structure 6 of the present embodiment can be fixed inside the support 7 in an embedded manner. The embodiment takes the following situations as examples of the specific embedded mode:
the support member 7 is a cup-shaped structural body, that is, the cup-shaped structural body includes a circular bottom plate 71 and an annular side plate 72 vertically connected to a circumferential edge of the circular bottom plate 71, and an assembly region for embedded assembly of the second magnetic element structure 6 is formed between the annular side plate 72 and the circular bottom plate 71. Here, the integrally formed magnetic ring structure 8 or the second magnetic element structure 6 formed by a plurality of magnetic bodies 9 distributed in a ring shape may be directly mounted on the inner wall surface of the ring-shaped side plate 72 by, for example, but not limited to, bonding. The mode of bonding fixed that here adopted is convenient for operate, and the operation degree of difficulty is low.
Finally, the outer rotor motor of the present embodiment further includes the following structure:
a PCB board 101 and a mounting board 102 are provided at one side of the open end of the rotor casing 1, wherein the PCB board 101 is disposed between the mounting board 102 and the stator assembly 22, and the PCB board is disposed on the bracket 21. The mounting plate 102 is provided to facilitate the assembly and fixation of the outer rotor motor of the present embodiment with other structures during specific use.
Example 2:
referring to fig. 5, based on the external rotor motor of embodiment 1, the external rotor motor provided in this embodiment has the same general structure as that of embodiment 1, except that the second magnetic element structure 6 of this embodiment is fixed inside the supporting member 7 in an embedded manner, but the embedded specific manner is different from that of embodiment 1.
The specific embedding manner adopted in the present embodiment is as follows:
the support 7 of the present embodiment is integrally injection molded with the magnetic ring structure 8 or the second magnetic element structure 6 formed by a plurality of magnetic bodies 9 distributed in a ring shape. The second magnetic element structure 6 is integrally injection-molded with the support part 7 injection molding body as an insert, so that the mounting precision of the second magnetic element structure 6 can be improved, the air gap between the second magnetic element structure 6 and the first magnetic element structure 5 is more uniform, the positioning moment is more stable, and the positioning precision is better; and the second magnetic element structure 6 is more reliably assembled after being coated by the support piece 7 injection molding body, and the product cost can be optimized through integral injection molding.
Example 3:
referring to fig. 6, on the basis of the external rotor motor of embodiment 1 or embodiment 2, the external rotor motor provided in this embodiment has the same general structure as that of embodiments 1 and 2, except that the second magnetic element structure 6 of this embodiment is fixed on the supporting member 7 by external embedding.
The specific manner of the exterior embedding adopted by the embodiment is as follows:
the support 7 includes a cylindrical body 73 and an annular bottom bracket 75 disposed at one axial end of the cylindrical body 73, and a table portion with an L-shaped cross section is formed between the annular bottom bracket 75 and the cylindrical body 73, the second magnetic element structure 6 formed by the integrally formed magnetic ring structure 8 or the plurality of magnetic bodies 9 annularly distributed is externally embedded on the side wall of the cylindrical body 73, and the annular bottom bracket 75 forms a support for one axial end of the second magnetic element structure 6. For the support 7 in this case, when it is assembled on the bracket 21, the end surface of the annular shoe 75 facing away from the second magnetic element structure 6 is distributed toward the stator assembly 22, i.e. a barrier between the second magnetic element structure 6 and the stator assembly 22 can be formed by the annular shoe 75, so that there is no magnetic interference between the stator windings in the stator assembly 22 and the second magnetic element structure 6.
The assembly structure between the support member 7 and the second magnetic element structure 6 adopted in this embodiment reduces the gap between the outer wall of the second magnetic element structure 6 and the first magnetic element structure 5, so that the second magnetic element structure 6 can directly act with the first magnetic element structure 5 to generate a positioning torque, and the range of the positioning torque is larger. The support member 7 can be made of metal materials, and the strength is higher.
In addition to the above structure, it should be noted that the second magnetic element structure 6 of the present embodiment can be fixed on the sidewall of the columnar body 73 by, for example, but not limited to, bonding; it is also possible to form the second magnetic element structure 6 and the support 7 as a unitary structure by injection molding.
In conclusion, the utility model discloses an external rotor electric machine, no matter be second magnetic element structure 6 through embedded or the mode of inlaying externally fix on support piece 7, as long as satisfy can firmly fix second magnetic element structure 6 through support piece 7, and can make support piece 7 form the fender that separates between second magnetic element structure 6 and the stator module 22, and then make the structure of no magnetic interference between stator winding in the stator module 22 and the second magnetic element structure 6 all satisfy the user demand of this embodiment.
The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (11)
1. An external rotor electric machine, comprising:
the rotor part comprises a rotor shell with a hollow accommodating cavity, a shaft arranged at the center of the rotor shell, and a main magnetic ring arranged on the wall of an inner cavity of the accommodating cavity along the circumferential direction;
a stator part which is arranged in the accommodating cavity in a manner of being opposite to the main magnetic ring and comprises a bracket and a stator component fixedly arranged on the bracket; and
the positioning assembly comprises a first magnetic element structure arranged on the inner cavity wall of the containing cavity along the circumferential direction, and a second magnetic element structure arranged in the containing cavity in a mode of being opposite to the first magnetic element structure.
2. The external rotor electric machine of claim 1, wherein the first magnetic element structures contact or separate from axially opposite end faces of the main magnetic ring.
3. The external rotor electric machine of any of claims 1 or 2, wherein the first magnetic element structure has the same or different number of poles as the main magnetic ring.
4. The external rotor electric machine of claim 3, wherein the first magnetic element arrangement has a pole count that is an integer multiple of the second magnetic element arrangement.
5. The external rotor electric machine of claim 1, wherein a bearing structure adapted to support free rotation of the shaft is provided between the inner cavity of the bracket and the outer wall of the shaft.
6. The external rotor electric machine of claim 1, wherein the second magnetic element structure is carried on a support; the support member is fixedly mounted on the bracket.
7. The external rotor electric machine of claim 6, wherein the support members are made of magnetically permeable material or non-magnetically permeable material.
8. The external rotor electric machine according to any of claims 6 or 7, wherein the second magnetic element structure is embedded inside the support.
9. The external rotor electric machine of any of claims 6 or 7, wherein the second magnetic element structure is externally embedded on a circumferential outer side wall of the support.
10. The external rotor electric machine of any of claims 6 or 7, wherein the second magnetic element structure and/or the first magnetic element structure is an integrally formed magnetic ring structure.
11. The external rotor electric machine according to any of claims 6 or 7, wherein the second magnetic element structure and/or the first magnetic element structure is a plurality of magnetic bodies distributed in a ring shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121594923.6U CN215009795U (en) | 2021-07-13 | 2021-07-13 | External rotor motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121594923.6U CN215009795U (en) | 2021-07-13 | 2021-07-13 | External rotor motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215009795U true CN215009795U (en) | 2021-12-03 |
Family
ID=79126722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121594923.6U Active CN215009795U (en) | 2021-07-13 | 2021-07-13 | External rotor motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215009795U (en) |
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2021
- 2021-07-13 CN CN202121594923.6U patent/CN215009795U/en active Active
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