CN217824474U - Outer rotor and motor applying same - Google Patents

Abstract

The utility model relates to an outer rotor and use motor of this outer rotor. The outer rotor comprises a cylindrical rotor shell, a rotor end cover, a central shaft and a permanent magnet; the rotor end cover is connected to one end of the rotor shell, the rotor shell surrounds the central shaft, the middle part of the rotor end cover is connected with the central shaft, and the permanent magnet is installed on the inner wall of the rotor shell; the rotor shell is formed by axially overlapping a plurality of laminations along the central shaft. The utility model discloses a rotor housing has increased rotor housing's magnetic resistance for a plurality of lamination superpositions form, makes rotor housing reduce the vortex to reduce the eddy current loss of rotor.

Description

Outer rotor and motor applying same

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of electric machines, concretely relates to motor of external rotor and applied this external rotor.

[ background of the invention ]

The number of pole pairs of the motor means that the motor is composed of a plurality of pairs of magnetic poles. The more the number of pole pairs of the motor, the more the number of cycles the motor rotor rotates one revolution to cut the magnetic field. For a motor with P pairs of poles (i.e., P pole pairs), the electromagnetic frequency is P times the mechanical frequency. Therefore, the more the number of pole pairs of the motor, the more the electromagnetic loss is brought. Motors in some fields often have a high pole pair number, for example, an outer rotor motor often has a high pole pair number, and therefore, a scheme for reducing electromagnetic loss of the outer rotor motor is urgently needed.

[ Utility model ] A method for manufacturing a semiconductor device

An object of the utility model is to reduce the vortex of rotor housing, reduce the eddy current loss of rotor.

Therefore, in a first aspect of the present invention, an outer rotor is provided, which includes a cylindrical rotor housing, a rotor end cover, a central shaft, and a permanent magnet; the rotor end cover is connected to one end of the rotor shell, the rotor shell surrounds the central shaft, the middle part of the rotor end cover is connected with the central shaft, and the permanent magnet is installed on the inner wall of the rotor shell; the rotor shell is formed by axially overlapping a plurality of laminations along the central shaft.

In an embodiment of the present invention, the outer rotor further includes a rotor housing, and the rotor housing is disposed at the periphery of the rotor housing, and the plurality of lamination sheets are fixedly connected to form a whole.

In an embodiment of the present invention, the rotor housing is fixedly connected to the plurality of lamination sheets by gluing.

In one embodiment of the invention, the rotor shell comprises a detent above the laminations of the rotor housing; one end of the clamping piece close to the lamination is provided with an elastic piece, and the elastic piece axially presses the lamination.

In one embodiment of the invention, the plurality of laminations are welded or fused to form a single body.

The utility model discloses an embodiment, the lamination has axial through-hole, the outer rotor still includes a plurality of axial connecting pieces, axial connecting piece passes after the lamination the through-hole that runs through of a plurality of laminations will a plurality of lamination fixed connection form a whole.

In one embodiment of the present invention, the lamination has a plurality of protrusions on the inner side, the protrusions being distributed along the circumferential direction of the lamination; after the plurality of laminations are stacked, a plurality of magnetic separation parts are formed at positions corresponding to the plurality of convex parts, the magnetic separation parts protrude out of the inner wall of the rotor shell and extend along the axial direction of the central shaft, and the plurality of magnetic separation parts are distributed along the circumferential direction of the rotor shell; the permanent magnet is the polylith, and every permanent magnet is installed the inner wall of rotor housing and is separated by corresponding magnetic separation portion.

In one embodiment of the present invention, each permanent magnet is magnetized in the thickness direction thereof; each permanent magnet forms a magnetic pole of the outer rotor, or X adjacent permanent magnets form a pole of the outer rotor together, and X is an integer greater than 1.

In an embodiment of the present invention, the plurality of stacked plates are stacked to form a first stacked body and a second stacked body, and the first stacked body magnetic separation portion is offset from the second stacked body magnetic separation portion by a predetermined angle in a circumferential direction of the central shaft.

Another object of the present invention is to reduce the eddy current loss of the rotor and improve the efficiency of the motor. Therefore, the second aspect of the present invention further provides an electric machine, comprising an outer rotor and an inner stator, wherein the outer rotor is the above-mentioned outer rotor, the outer rotor is rotatably mounted to the inner stator through the central shaft, and the inner stator is at least partially accommodated in the rotor housing.

In one embodiment of the present invention, the motor further comprises a mounting housing, the mounting housing comprising a cylindrical housing, a first end cap and a second end cap; the first end cover and the second end cover are respectively connected to two ends of the cylindrical shell; the rotor housing is accommodated in the cylindrical shell and positioned between the first end cover and the second end cover; the central shaft penetrates through the first end cover for outputting outwards.

Compared with the prior art, the utility model discloses a rotor housing has increased rotor housing's magnetic resistance for a plurality of lamination superpositions form, has reduced rotor housing's vortex to reduce the eddy current loss of rotor.

[ description of the drawings ]

Fig. 1 is a schematic cross-sectional view of a motor according to an embodiment of the present invention;

FIG. 2 is a schematic view of an outer rotor of the motor of FIG. 1;

FIG. 3 is an exploded view of the outer rotor of FIG. 2 without permanent magnets assembled;

FIG. 4 is an exploded view of the rotor shell and laminations of the rotor housing shown in FIG. 3;

FIG. 5 is an exploded view of the laminations and permanent magnets of the outer rotor of FIG. 2;

FIG. 6 is a schematic plan view of the permanent magnet of FIG. 5;

FIG. 7 is a perspective view of the permanent magnet of FIG. 6;

fig. 8 is a schematic plan view of a permanent magnet according to an embodiment of the present invention;

fig. 9 is a schematic plan view of another permanent magnet provided in accordance with an embodiment of the present invention;

fig. 10 is a schematic view of a rotor case provided in embodiment 2 of the present invention;

fig. 11 is a schematic view of a rotor case according to embodiment 3 of the present invention.

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1

Referring to fig. 1 and 2, an embodiment of the present invention provides a motor 500 including an outer rotor and an inner stator 150. This outer rotor is the outer rotor 200 of the present embodiment.

The outer rotor 200 includes a cylindrical rotor case 10, a rotor cover 30, a center shaft 50, and permanent magnets 80. Specifically, the rotor cover 30 is coupled to one end of the rotor case 10, the rotor case 10 surrounds the central shaft 50, the middle portion of the rotor cover 30 is coupled to the central shaft 50, and the permanent magnets 80 are mounted to the inner wall of the rotor case 10.

The inner stator 150 has a support portion, a stator core fixedly fitted to the support portion, and a stator winding wound to the stator core. When the motor 500 is assembled, the center shaft 50 of the rotor 200 passes through the center of the support portion of the inner stator 150 in the length direction thereof, and the center shaft 50 is supported by the support portion, so that the rotor 200 can rotate with respect to the inner stator 150. The inner stator 150 is at least partially accommodated in the cylindrical rotor housing 10. When the motor 500 operates, the stator core of the inner stator 150 forms a stator pole under the action of the stator winding, the stator pole generates an acting force on the permanent magnet 80, and the acting force is transmitted to the central shaft 50 through the rotor housing 10 after the permanent magnet 80 is stressed. It will be appreciated that after the motor is assembled, in particular, the rotor housing 10 surrounds the stator core of the inner stator 150. After the permanent magnet 80 is mounted to the inner wall of the rotor case 10, the inner wall surface of the permanent magnet 80 serves as the inner wall surface of the outer rotor 200, and surrounds the outer surface of the stator core with a predetermined gap, so that the outer rotor 200 rotates relative to the stator core.

Further, referring to fig. 1, the motor 500 further includes a mounting case 400, the mounting case 400 including a cylindrical case 401, a first end cap 403, and a second end cap 405; a first end cap 403 and a second end cap 405 are connected to both ends of the cylindrical housing 401, respectively. The rotor case 10 is housed in the cylindrical case 401 between the first and second end caps 403 and 405. The center shaft 50 passes through the first end cap 403 for outward output. The second end cap 405 may be formed integrally with the support portion of the inner stator.

Referring to fig. 3, in the present embodiment, the rotor cover 30 is formed separately from the rotor housing 10. However, in the alternative, the rotor end cover 30 may be integrally formed with the rotor housing 10.

Referring to fig. 4, the present invention improves the rotor housing 10 by designing the rotor housing 10 as a plurality of laminations stacked axially along the central axis 50. It is understood that each stacked lamination in the rotor housing 10 is a complete ring, so that several laminations are axially stacked to form the whole cylindrical rotor housing 10. In a particular embodiment, the laminations can be stamped out in a form-fitting manner with the stator core, saving material and increasing manufacturing efficiency. In this manner, the rotor housing 10 is designed as an axially stacked configuration of layered laminations along the central axis 50, increasing the magnetic reluctance of the rotor housing 10 and reducing eddy currents in the rotor housing.

Referring to fig. 4, in the present embodiment, the outer rotor 200 further includes a rotor housing 15, and the rotor housing 15 is sleeved on the outer circumference of the rotor case 10 and fixedly connected with a plurality of laminations to form a whole. Specifically, the rotor housing 15 is a one-piece annular body molded from a metal material or a plastic material such as stainless steel or aluminum having a non-magnetic property. The rotor housing 15 formed by stainless steel or aluminum metal material with non-magnetic conductivity is fixedly connected with a plurality of laminations into a whole in a gluing mode. The rotor housing 15 formed by plastic materials is fixedly connected with a plurality of lamination sheets into a whole in a rubber coating and injection molding mode. Preferably, the radial thickness of the yoke of the lamination formed rotor housing 10 is greater than the radial thickness of the rotor shell 15. In a particular embodiment, the radial thickness of the yoke portion of the lamination formed rotor housing 10 is between 3-8mm, and the radial thickness of the stainless steel formed rotor shell 15 is between 0.2-0.5 mm; the radial thickness of the rotor shell 15 formed by metal aluminum is between 2.5 and 5 mm; the radial thickness of the rotor housing 15, which is formed from a plastics material, is between 2 and 2.8 mm. Thus, the rotor housing 15 enhances the axial connection strength of the lamination of the rotor housing 10, so that the lamination of the rotor housing 10 is not scattered in the motor rotation process, thereby stably increasing the magnetic resistance of the lamination of the rotor housing 10 and reducing the induced eddy current of the rotor housing due to the change of the magnetic field in the motor rotation process.

Further, in one specific embodiment, in order to increase the axial fixing strength of the lamination of the rotor case 10, the rotor housing 15 further includes a locking member (not shown) disposed above the lamination of the rotor case 10. Specifically, the locking member may be a blocking wall or a protruding ring disposed on the inner wall of the rotor housing 15. Preferably, the end of the retaining wall or collar close to the lamination is provided with an elastic element which axially presses the lamination. It will be appreciated that the rotor shell 15, which is formed of a plastic material or a metallic aluminum material having a radial thickness of not less than 2mm, is better able to provide and support the detent.

Referring to fig. 5, in an alternative embodiment, rotor shell 15 may not be required. After several laminations of the rotor housing 10 are stacked, adjacent laminations are welded or fused to form a unitary body.

Further, with reference to fig. 5, the lamination has several protrusions 11 on the inside. The protrusions 11 are distributed along the circumferential direction of the lamination. After the lamination sheets are stacked, a plurality of magnetic spacers 113 are formed at positions corresponding to the plurality of projections 11. The magnetic shielding portion 113 protrudes from the inner wall of the rotor case 10 and extends in the axial direction of the center shaft 50. The magnetic partitions 113 are distributed along the circumferential direction of the rotor case 10.

The magnetic spacer 113 is used to position and fix the permanent magnet 80. Referring to fig. 6 and 7, the outer rotor 200 has a plurality of permanent magnets 80, and the permanent magnets 80 are mounted to the inner wall of the rotor case 10 and are partitioned by corresponding magnetic partitions 113. It will be appreciated that several mounting slots are formed between each two adjacent projections 11 on the inside of the lamination. After the lamination sheets are stacked, permanent magnet installation parts are formed at positions corresponding to the installation grooves. The permanent magnets 80 are installed in permanent magnet installation portions of the inner wall of the rotor case 10. In this way, the inner wall of the rotor case 10 is formed with the magnetic isolation portion 113 and the permanent magnet mounting portion partitioned and preset by the magnetic isolation portion 113; the permanent magnet 80 can be directly mounted to the rotor case 10 without providing an additional magnetic spacer at the rotor cover 30, thereby reducing the manufacturing process and cost. The number of permanent magnets 80 shown in fig. 6 and 7 is merely illustrative and is not intended to limit the scope of the present invention.

Specifically, each permanent magnet 80 is magnetized in its thickness direction, i.e., two magnetic poles (N pole and S pole) are respectively inside and outside each permanent magnet 80. In this embodiment, each successive 3 permanent magnets 80 form one pole of the outer rotor. The three permanent magnets 80 of each set have the same polarity on the inside, thereby collectively forming one pole of the outer rotor. Thus, the arrangement structure of the permanent magnets 80 is reasonably arranged, the loop of the eddy current is reduced, and the eddy current loss is reduced.

Referring to fig. 8, in an alternative embodiment, each permanent magnet forms one pole of the outer rotor. Referring to fig. 9, in another embodiment, every two adjacent permanent magnets together form one pole of the outer rotor as a group. Understandably, as shown in fig. 6 and 9, adjacent X permanent magnets may be arranged to form one magnetic pole of the outer rotor 200 together; and X is an integer greater than 1. For example: every two adjacent permanent magnets form one magnetic pole of the outer rotor 200 (refer to fig. 9). Each adjacent three permanent magnets form one magnetic pole of the outer rotor 200 (refer to fig. 6 and 7).

Example 2

Referring to fig. 10, compared with the above embodiment 1, the present embodiment 2 is different in that the lamination has an axial through hole 119, and the outer rotor 200 further includes a plurality of axial connecting members, which pass through the through holes 119 of the plurality of lamination after lamination, and fixedly connect the plurality of lamination to form a whole. For example: the axial connecting piece is a screw rod with threads at two ends, and the lamination is fixedly connected through assembling nuts at two ends. In this way, the rotor shell 15 can be eliminated by fixing the plurality of laminations together by the plurality of axial connectors to form the whole of the rotor housing 10.

Example 3

Referring to fig. 11, the present embodiment is different in that a first stack 10a and a second stack 10b are formed after several laminations are stacked, and the first stack 10a is offset by a predetermined angle from the second stack 10b in the circumferential direction of the central axis 50 such that the magnetic spacing portions 113 of the first stack 10a and the magnetic spacing portions 113 of the second stack 10b are offset by a predetermined angle. When the first stack 10a and the second stack 10b respectively form a magnetic pole for every three adjacent permanent magnets, the first stack 10a and the second stack 10b are added together to form a magnetic pole for every six permanent magnets of the outer rotor 200. By analogy, when the first stack 10a and the second stack 10b respectively form a magnetic pole for every two adjacent permanent magnets, the first stack 10a and the second stack 10b together form a magnetic pole for every four permanent magnets of the outer rotor 200. Therefore, the whole rotor housing 10 formed by the first stack 10a and the second stack 10b which are formed by stacking and splicing a plurality of laminations can still exert the effect of increasing the magnetic resistance of the whole rotor housing 10 by the plurality of laminations, so that the eddy current of the rotor housing is reduced.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, such as combinations of different features in the various embodiments, which are within the scope of the present invention.

Claims (10)

1. An outer rotor comprises a cylindrical rotor shell, a rotor end cover, a central shaft and a permanent magnet; the rotor end cover is connected to one end of the rotor shell, the rotor shell surrounds the central shaft, the middle part of the rotor end cover is connected with the central shaft, and the permanent magnet is installed on the inner wall of the rotor shell; the rotor is characterized in that the rotor shell is formed by axially stacking a plurality of laminations along the central shaft.

2. The external rotor of claim 1, further comprising a rotor shell, wherein the rotor shell is disposed around the rotor housing and fixedly coupled to the plurality of laminations to form a unitary body.

3. The external rotor of claim 2, wherein the rotor shell includes a detent over the laminations of the rotor housing; one end of the clamping piece close to the lamination is provided with an elastic piece, and the elastic piece axially presses the lamination.

4. The external rotor of claim 1, wherein the plurality of laminations are welded or fused to form a unitary body.

5. The external rotor of claim 1, wherein the lamination has an axial through hole, and further comprising a plurality of axial connectors passing through the through holes of the plurality of lamination after lamination to fixedly connect the plurality of lamination to form a whole.

6. The external rotor of claim 1, wherein the laminations have a plurality of protrusions on an inner side thereof, the protrusions being distributed along a circumferential direction of the laminations; after the plurality of laminations are stacked, a plurality of magnetic separation parts are formed at positions corresponding to the plurality of convex parts, the magnetic separation parts protrude out of the inner wall of the rotor shell and extend along the axial direction of the central shaft, and the plurality of magnetic separation parts are distributed along the circumferential direction of the rotor shell; the permanent magnet is the polylith, and every permanent magnet is installed the inner wall of rotor housing and is separated by corresponding magnetic separation portion.

7. The external rotor of claim 6, wherein each permanent magnet is magnetized in a thickness direction thereof; each permanent magnet forms a magnetic pole of the outer rotor, or X adjacent permanent magnets form a pole of the outer rotor together, and X is an integer greater than 1.

8. The external rotor of claim 6, wherein the plurality of laminations form a first stack and a second stack after being stacked, and the first stack magnetic separation portion is offset from the second stack magnetic separation portion by a predetermined angle in a circumferential direction of the central axis.

9. An electric machine comprising an outer rotor and an inner stator, wherein the outer rotor is an outer rotor according to any of claims 1-8, the outer rotor being rotatably mounted to the inner stator by means of the central shaft, the inner stator being at least partially received within the rotor housing.

10. The electric machine of claim 9 further comprising a mounting housing comprising a cylindrical housing, a first end cap, and a second end cap; the first end cover and the second end cover are respectively connected to two ends of the cylindrical shell; the rotor housing is accommodated in the cylindrical shell and positioned between the first end cover and the second end cover; the central shaft penetrates through the first end cover for outputting outwards.

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