CN110707838A

CN110707838A - Inner rotor motor

Info

Publication number: CN110707838A
Application number: CN201810784781.6A
Authority: CN
Inventors: 洪银树; 邱柏伟
Original assignee: Sunonwealth Electric Machine Industry Co Ltd
Current assignee: Sunonwealth Electric Machine Industry Co Ltd
Priority date: 2018-07-09
Filing date: 2018-07-17
Publication date: 2020-01-17
Also published as: TW202007049A

Abstract

An inner rotor motor for solving the problem of poor operation quality of the existing inner rotor motor comprises: a stator having a ring base formed by winding an elongated magnetic pole member into a circular shape, the ring base having a plurality of magnetic poles, an outer end of any two adjacent magnetic poles being connected, an inner end of any two adjacent magnetic poles having a minimum distance, the stator having a coil group wound around the plurality of magnetic poles; and a rotor rotatably arranged in the space surrounded by the ring seat, a minimum air gap is formed between the rotor and the stator, and the minimum distance is greater than the minimum air gap.

Description

Inner rotor motor

Technical Field

The present invention relates to motors, and particularly to an inner rotor motor.

Background

The conventional inner rotor motor has a stator and a rotor. The stator is provided with a plurality of iron cores and a coil group, and the coil group is wound on the iron cores; each iron core is provided with a magnetic yoke part and pole shoe parts, any two adjacent magnetic yoke parts are connected, and a space is reserved between any two adjacent pole shoe parts. The rotor is rotatably arranged in a space surrounded by the pole shoe parts, and an air gap is formed between the periphery of the rotor and the pole shoe parts of the stator so that the rotor can smoothly rotate relative to the stator.

In manufacturing the stator of the conventional inner rotor motor, the cores are often integrally formed by pressing to form an annular body, and then the coil assembly is wound around each core. However, if the manufacturing method is used for a multi-pole (for example, more than twelve poles) inner rotor motor, two adjacent iron cores will be closer to each other, so that the distance between the two adjacent iron cores becomes smaller, therefore, two adjacent pole shoe portions cannot maintain a sufficient gap, so that the winding operation of the winding group is not easy to be performed, not only the winding operation is long, but also the winding machine often scratches the coil group carelessly in the winding process; in addition, magnetic lines of force between the pole coils interfere with each other, so that a severe magnetic leakage phenomenon is easily caused, and the operation efficiency and the operation quality of the inner rotor motor are further affected.

In view of the above, there is a need for an improved inner rotor motor.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide an inner rotor motor, in which a minimum distance is formed between any two adjacent magnetic poles, and the minimum distance is greater than a minimum air gap between a stator and a rotor, so as to prevent magnetic lines of force between coils of the respective magnetic poles from interfering with each other, and thus the operation of the inner rotor motor can be more stable.

The inner rotor motor of the present invention includes: a stator having a ring base formed by winding an elongated magnetic pole member into a circular shape, the ring base having a plurality of magnetic poles, an outer end of any two adjacent magnetic poles being connected, an inner end of any two adjacent magnetic poles having a minimum distance, the stator having a coil group wound around the plurality of magnetic poles; and a rotor rotatably arranged in the space surrounded by the ring seat, a minimum air gap is formed between the rotor and the stator, and the minimum distance is greater than the minimum air gap.

Therefore, the inner rotor motor of the invention utilizes the minimum distance formed between any two adjacent magnetic poles and the minimum distance is larger than the minimum air gap, so that any two adjacent magnetic poles are not close to each other too much; therefore, the operation convenience of winding the coil assembly can be improved, the phenomenon of magnetic flux leakage caused by mutual interference of magnetic force lines among the pole coils is avoided, the operation of the inner rotor motor can be more stable, and the inner rotor motor has the effects of improving the operation efficiency and the operation quality of the inner rotor motor.

The ring seat is provided with an insulation sleeve set and a plurality of iron core units arranged in the insulation sleeve set, and each iron core unit and the insulation sleeve set jointly form each magnetic pole. Therefore, the structure is simple and convenient to manufacture and assemble, and has the effects of reducing the manufacturing cost and improving the assembling convenience.

One end of each iron core unit, which is close to the rotor, is provided with a pole shoe part, and the minimum distance is formed between the pole shoe parts of any two adjacent iron core units. Thus, the minimum distance has the effect of avoiding the mutual interference of the magnetic lines of force between the coils of the poles.

The rotor is provided with a magnet part arranged on the periphery of a rotating shaft, each pole shoe part is provided with a magnetic pole surface facing the magnet part, and the minimum air gap is formed between the magnetic pole surfaces and the magnet part. Thus, magnetic linkage can be generated between the pole shoe part and the magnet part, and the rotor can run.

Wherein, the one end of each iron core unit far away from this rotor has a yoke portion, and this ring seat is connected by this yoke portion of arbitrary two neighbours. Therefore, the ring seat has the effect of improving the manufacturing convenience of the ring seat.

Wherein, the number of the magnetic poles is at least twelve and is a multiple of three. Therefore, a three-phase winding can be formed, and the effect of obtaining higher power compared with a single-phase winding is achieved.

Wherein the minimum distance is less than or equal to eight times the minimum air gap. Therefore, the minimum distance is not too large, and the effect of avoiding influencing the running quality of the inner rotor motor is achieved.

Wherein, the ring seat is combined with two ends of the magnetic pole component by laser welding to form a ring shape. Therefore, the magnetic pole assembly has the effect of improving the combination stability of the two ends of the magnetic pole assembly.

Wherein the minimum distance is greater than four times the minimum air gap. Therefore, a better distance is formed between any two adjacent pole shoe parts, and the effect of ensuring that magnetic lines of force cannot interfere with each other is achieved.

Drawings

Fig. 1 is an exploded perspective view of a preferred embodiment of the present invention.

Fig. 2 is a perspective view of a stator according to a preferred embodiment of the present invention, which is not bent into a ring shape.

Fig. 3 is a perspective view of a core unit according to a preferred embodiment of the present invention.

FIG. 4 is a schematic view of a stator and a rotor assembly according to a preferred embodiment of the present invention.

Fig. 5 is a partially enlarged view shown in a of fig. 4.

Description of the reference numerals

[ the invention ]

1 stator

11 ring seat 12 magnetic pole

12a outer end 12b inner end

13 insulating sleeve on the insulating sleeve group 13a

13b lower insulating sleeve 14 iron core unit

141 pole shoe portion 141a magnetic pole surface

142 pole piece 143 yoke portion

15 coil group

2 rotor

21 rotating shaft 22 magnet part

C magnetic pole assembly

Minimum distance of D

G minimum air gap.

Detailed Description

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below:

the following directional terms or their similar terms, such as "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "side", etc., refer to the directions of the drawings, and are used only for the purpose of describing and understanding the embodiments of the present invention, and are not intended to limit the present invention.

Referring to fig. 1, it is a preferred embodiment of the inner rotor motor of the present invention, which includes a stator 1 and a rotor 2, wherein the rotor 2 is rotatably disposed in the stator 1.

Referring to fig. 1 and 2, the stator 1 has a ring seat 11, the ring seat 11 is formed by bending a long magnetic pole assembly C as shown in fig. 2 to form a circular shape, and the ring seat 11 preferably connects two ends of the magnetic pole assembly C by laser welding to improve the connection stability of the two ends of the magnetic pole assembly C and to precisely and rapidly complete the connection operation. The ring seat 11 has a plurality of magnetic poles 12, and the stator 1 has a coil assembly 15 wound around the plurality of magnetic poles 12. Wherein, the number of the magnetic poles 12 is preferably at least twelve and is a multiple of three; therefore, a three-phase winding can be formed, and the effect of obtaining higher power compared with a single-phase winding is achieved. In the present embodiment, the number of the magnetic poles 12 is twelve.

In detail, the plurality of magnetic poles 12 respectively have an outer end 12a and an inner end 12b, each outer end 12a is far from one end of the rotor 2, and each inner end 12b is near one end of the rotor 2. The ring seat 11 may have an insulating sleeve 13 and a plurality of core units 14, and the insulating sleeve 13 of the present embodiment may be, for example, an upper insulating sleeve 13a and a lower insulating sleeve 13b, so as to cover the core units 14 up and down; each core unit 14 is preferably formed by axially stacking a plurality of silicon steel sheets to a predetermined thickness, and each core unit 14 and the insulating sleeve 13 together form each magnetic pole 12. It should be noted that, each core unit 14 may also be directly plated with an insulating layer (not shown), so that the insulating layer replaces the insulating sleeve 13 to provide an insulating effect, and the invention is not limited thereto.

Referring to fig. 3, each core unit 14 may have a pole shoe portion 141, a pole column portion 142, and a yoke portion 143, the pole shoe portion 141 and the yoke portion 143 are respectively connected to two ends of the pole column portion 142, and the pole shoe portion 141, the pole column portion 142, and the yoke portion 143 may be integrally connected, which is not limited in the present invention.

Referring to fig. 4 and 5, each pole shoe 141 is located at the inner end 12b, a minimum distance D is provided between any two adjacent pole shoes 141, and each pole shoe 141 may have a magnetic pole face 141a, and each magnetic pole face 141a faces the rotor 2; the yoke portion 143 is located at the outer end 12a, the ring seat 11 is connected by any two adjacent yoke portions 143, and the two adjacent yoke portions 143 are preferably integrally connected to ensure that each core unit 14 has sufficient structural strength to stably support each pole portion 142, so that the quality of each core unit 14 is further improved; the pole part 142 is connected between the pole piece part 141 and the yoke part 143, and the coil assembly 15 is wound around a portion corresponding to the pole parts 142.

The coil assembly 15 is wound around the insulating sleeve assembly 13 covering the plurality of core units 14, so that the insulating sleeve assembly 13 can be disposed between the plurality of core units 14 and the coil assembly 15, thereby further ensuring good insulation between the coil assembly 15 and each core unit 14. After the coil assembly 15 is wound around the pole portions 142 of the magnetic poles 12, the magnetic pole assembly C is fixed to the circular ring 11 by bending, so as to improve the convenience of winding the coil assembly 15.

Referring to fig. 1, 4 and 5, the rotor 2 is rotatably disposed in a space surrounded by the pole shoe portions 141 of the ring seat 11. The rotor 2 may have a rotating shaft 21 and a magnet portion 22, the magnet portion 22 is disposed on the outer periphery of the rotating shaft 21, the magnet portion 22 may be, for example, a base body combined with the rotating shaft 21, and a plurality of magnets arranged in a ring shape are disposed on the base body; or other equivalent structures, the invention is not limited. The magnetic pole surface 141a of each pole shoe 141 faces the magnet 22 of the shaft 21, and a minimum air gap G is formed between the outer periphery of the magnet 22 and the magnetic pole surface 141 a.

The minimum distance D is formed between any two adjacent pole shoe portions 141, and is greater than the minimum air gap G, and the minimum distance D may be greater than four times the minimum air gap G, so as to ensure that magnetic lines of force do not interfere with each other. Preferably, the minimum distance D is less than or equal to eight times the minimum air gap G; therefore, the minimum distance D can be ensured not to be overlarge, and the effect of avoiding influencing the running quality of the inner rotor motor is achieved.

With reference to fig. 4 and 5, with the above structure, the rotor 2 is accommodated in the space enclosed by the pole shoe portions 141 of the ring seat 11, and the magnet portion 22 of the rotor 2 is opposite to the magnetic pole face 141a of the pole shoe portion 141 of each core unit 14; the minimum distance D formed between any two adjacent pole shoe portions 141 is greater than the minimum air gap G formed between the magnet portion 22 and the magnetic pole face 141 a; any two adjacent pole shoe portions 141 can be spaced within a predetermined distance range, and a sufficient gap can be maintained between two adjacent pole portions 142, so as to improve the operation convenience of winding the coil assembly 15, and avoid magnetic flux leakage caused by mutual interference of magnetic flux lines between the pole coils. Thus, when the coil assembly 15 of the stator 1 is energized, the pole shoe portion 141 of the corresponding magnetic pole 12 generates a magnetic force to repel the magnet portion 22 of the rotor 2, so as to smoothly drive the rotating shaft 21 of the rotor 2 to rotate, thereby stabilizing the operation of the inner rotor motor.

In summary, in the inner rotor motor of the present invention, the minimum distance is formed between any two adjacent magnetic poles, and the minimum distance is greater than the minimum air gap, so that any two adjacent magnetic poles are not too close to each other; therefore, the operation convenience of winding the coil assembly can be improved, the phenomenon of magnetic flux leakage caused by mutual interference of magnetic force lines among the pole coils is avoided, the operation of the inner rotor motor can be more stable, and the inner rotor motor has the effects of improving the operation efficiency and the operation quality of the inner rotor motor.

Claims

1. An inner rotor motor, comprising:

a stator having a ring base formed by winding an elongated magnetic pole member into a circular shape, the ring base having a plurality of magnetic poles, an outer end of any two adjacent magnetic poles being connected, an inner end of any two adjacent magnetic poles having a minimum distance, the stator having a coil group wound around the plurality of magnetic poles; and

and the rotor is rotatably arranged in the space surrounded by the ring seat, a minimum air gap is formed between the rotor and the stator, and the minimum distance is greater than the minimum air gap.

2. The inner rotor motor of claim 1, wherein the ring base has an insulating sleeve and a plurality of core units disposed in the insulating sleeve, each core unit and the insulating sleeve forming each magnetic pole.

3. The internal rotor motor of claim 2, wherein each core element has a pole shoe portion adjacent an end of the rotor, the minimum distance being formed between the pole shoe portions of any two adjacent core elements.

4. The inner rotor motor of claim 3, wherein the rotor has a magnet portion disposed at an outer periphery of a shaft, each pole shoe portion having a pole face facing the magnet portion, the pole face and the magnet portion forming the minimum air gap therebetween.

5. The internal rotor motor of claim 2, wherein each core element has a yoke portion at an end remote from the rotor, the ring mounts being connected by any two adjacent yoke portions.

6. The internal rotor motor of claim 1, wherein the number of poles is at least twelve and is a multiple of three.

7. The inner rotor motor of any one of claims 1-6, wherein the minimum distance is less than or equal to eight times the minimum air gap.

8. The inner rotor motor of any one of claims 1 to 6, wherein the ring seat is laser welded to both ends of the pole assembly to form a ring shape.

9. The internal rotor motor of claim 7, wherein the minimum distance is greater than four times the minimum air gap.