CN218415932U

CN218415932U - External rotor motor

Info

Publication number: CN218415932U
Application number: CN202123430380.7U
Authority: CN
Inventors: 侯维平
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-01-31
Anticipated expiration: 2031-12-30

Abstract

An outer rotor motor comprises a rotating shaft, an outer rotor connected with the rotating shaft and an inner stator positioned between the rotating shaft and the outer rotor, wherein the inner stator comprises a stator core and a winding wound on the stator core. The inner stator includes along circumference evenly distributed in the peripheral several wire winding groove of stator core, the wire winding groove is the rectangle setting, the winding is formed by the flat wire coiling and holds in the wire winding groove. The flat wires are mostly rectangular, and the gaps among the flat wires are small when the flat wires are arranged, so that the external rotor motor can achieve ultrahigh slot filling rate.

Description

External rotor motor

[ technical field ]

The utility model relates to an external rotor electric machine technical field, in particular to adopt flat wire winding's external rotor electric machine.

[ background art ]

As a motor with small volume and high efficiency, the brushless outer rotor motor is more and more widely used in various fields and is deeply popular in various industries. Currently, an external rotor motor includes an inner stator and an external rotor sleeved outside the inner stator, and the inner stator is generally made of a stator core and a winding wound on the stator core. However, the windings of the conventional inner stator are mostly formed by winding ordinary round wires, and because the round wires are arranged with gaps therebetween and are limited by a winding device, the groove fullness of the outer rotor motor is difficult to be continuously increased, thereby limiting the increase of the power density of the outer rotor motor.

In view of the above, it is necessary to provide an improved external rotor motor to overcome the defects of the prior art.

[ contents of utility model ]

The utility model aims to prior art not enough, the utility model provides an external rotor electric machine, its winding is formed by the flat wire coiling, has guaranteed external rotor electric machine's high groove fullness rate.

The utility model provides a technical scheme that prior art problem adopted is: an outer rotor motor comprises a rotating shaft, an outer rotor connected with the rotating shaft and an inner stator positioned between the rotating shaft and the outer rotor, wherein the inner stator comprises a stator core and a winding wound on the stator core. The inner stator includes along circumference evenly distributed in several wire winding groove on the stator core periphery, the wire winding groove is the rectangle setting, the winding is formed by the flat wire coiling and hold in the wire winding inslot.

The further improvement scheme is as follows: the stator core is provided with a yoke ring sleeved on the outer side of the rotating shaft and a plurality of tooth parts extending outwards from the yoke ring along the radial direction, the tooth parts are evenly distributed along the circumferential direction, and the winding is wound on the tooth parts.

The further improvement scheme is as follows: the winding slots are formed between the adjacent tooth parts, and the windings are wound on the tooth parts and are contained in the winding slots.

The further improvement scheme is as follows: the free ends of the adjacent teeth extend towards each other to form a clamping groove which is communicated with the winding groove and is positioned on one side of the winding groove far away from the yoke ring.

The further improvement scheme is as follows: the rotating shaft extends along the axial direction, and the stator core is formed by a plurality of stator punching sheets in an axial stacking mode.

The further improvement scheme is as follows: the outer rotor comprises a machine shell sleeved on the outer side of the inner stator and a plurality of magnetic poles attached to the inner wall of the machine shell, and the magnetic poles are uniformly distributed along the circumferential direction.

The further improvement scheme is as follows: the outer rotor the casing is by the integrative stamping forming of metalwork, just the casing includes excircle lateral wall and is located the circular end wall of excircle lateral wall one end, circular end wall connect in the pivot, the magnetic pole laminate in the inboard of excircle lateral wall.

The further improvement scheme is as follows: the magnetic pole is composed of an outer arc, an inner arc and side edges which are symmetrical left and right and are connected with the outer arc and the inner arc, and the outer arc of the magnetic pole is attached to the inner wall of the outer circle side wall.

The further improvement scheme is as follows: the inner arc of the magnetic pole of the outer rotor and the outer arc of the winding slot of the inner stator are concentric circles, and an air gap exists between the inner arc of the magnetic pole and the outer arc of the winding slot.

The further improvement scheme is as follows: the number of the magnetic poles of the outer rotor is 8, and the number of the winding slots of the stator core is 12.

Compared with the prior art, the utility model discloses following beneficial effect has: the inner stator includes along circumference evenly distributed in the peripheral several wire winding groove of stator core, the wire winding groove is the rectangle setting, the winding is formed by the flat wire coiling and holds in the wire winding groove. The flat wires are mostly rectangular, and the gaps among the flat wires are small when the flat wires are arranged, so that the external rotor motor can achieve ultrahigh slot filling rate.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic perspective view of an external rotor motor according to a preferred embodiment of the present invention;

fig. 2 is a partially exploded view of the outer rotor motor shown in fig. 1;

fig. 3 is an exploded view of an inner stator in the outer rotor motor shown in fig. 2;

fig. 4 is a front view of the outer rotor motor shown in fig. 1;

fig. 5 is a front view of a stator core in the outer rotor motor shown in fig. 4.

The meaning of the reference symbols in the figures:

100. outer rotor motor 10, rotating shaft 20, outer rotor 21, casing 22, magnetic pole 30, inner stator 31, winding 40, stator core 41, yoke ring 42, tooth 43, winding slot 44 and clamping slot

[ detailed description of the invention ]

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper", "lower", "front", "rear", etc., indicating directions or positional relationships described below are based only on directions or positional relationships shown in the drawings, are only for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the devices/elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1 to 5, an external rotor motor 100 according to a preferred embodiment of the present invention is generally used for connecting to an electric tool and has the advantages of high efficiency, small size, long service life, etc. The outer rotor motor 100 includes a rotation shaft 10 extending in an axial direction, an outer rotor 20 connected to the rotation shaft 10, and an inner stator 30 located between the rotation shaft 10 and the outer rotor 20, wherein the outer rotor 20 is fixed to the rotation shaft 10, and the rotation shaft 10 rotates with the outer rotor 20 relative to the inner stator 30.

Referring to fig. 2 and 4, the outer rotor 20 includes a casing 21 sleeved outside the inner stator 30 and a plurality of magnetic poles 22 attached to an inner wall of the casing 21, and the magnetic poles 22 are uniformly distributed along a circumferential direction. Casing 21 is by the integrative stamping forming of metalwork, just casing 21 includes the excircle lateral wall and is located the circular end wall of excircle lateral wall one end, circular end wall connection is in pivot 10, so that outer rotor 20 is along with pivot 10 synchronous revolution. The magnetic pole 22 is attached to the inner side of the outer circular side wall, the magnetic pole 22 is composed of an outer circular arc, an inner circular arc and side edges which are symmetrical left and right and are connected with the outer circular arc and the inner circular arc, and the outer circular arc of the magnetic pole 22 is attached to the inner wall of the outer circular side wall.

Referring to fig. 3 to 5, the inner stator 30 is accommodated in the casing 21 of the outer rotor 20 and includes a stator core 40 and a winding 31 wound on the stator core 40, and the stator core 40 is formed by axially stacking a plurality of stator laminations. The stator core 40 is provided with a yoke ring 41 sleeved outside the rotating shaft 10, a plurality of teeth 42 extending radially outward from the yoke ring 41, and a plurality of winding slots 43 located on the outer periphery of the stator core 40, wherein the plurality of teeth 42 and the plurality of winding slots 43 are uniformly distributed along the circumferential direction.

Specifically, the winding slots 43 are arranged in a rectangular shape, the winding slots 43 are formed between adjacent teeth 42, and the winding 31 is wound around the teeth 42 and is accommodated in the winding slots 43. Further, the winding 31 is formed by winding a flat wire and is accommodated in the winding groove 43, wherein the flat wire is mostly rectangular, and a gap between the flat wires is small when the flat wires are arranged, so that the external rotor motor 100 can achieve an ultra-high slot filling factor. Meanwhile, the free ends of the adjacent teeth 42 extend toward each other to form a catching groove 44, and the catching groove 44 is communicated with the winding groove 43 and is located on the side of the winding groove 43 away from the yoke 41, so that the flat wire can be wound on the teeth 42 through the catching groove 44.

In the present embodiment, the number of the magnetic poles 22 of the outer rotor 20 is 8, and the number of the winding slots 43 of the stator core 40 is 12. The inner arc of the magnetic pole 22 of the outer rotor 20 and the outer arc of the winding groove 43 of the inner stator 30 are concentric circles, and an air gap exists between the inner arc of the magnetic pole 22 and the outer arc of the winding groove 43.

The utility model discloses in, inner stator 30 includes along circumference evenly distributed in the peripheral several wire winding groove 43 of stator core 40, wire winding groove 43 is the rectangle setting, winding 31 is formed by the flat wire coiling and holds in wire winding groove 43. Most of the flat wires are rectangular, and a gap between the flat wires is small when the flat wires are arranged, so that the external rotor motor 100 can achieve an ultrahigh slot fill factor.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that there are numerous alternatives to the external rotor electric machine of the present invention without departing from the principles and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An outer rotor motor comprises a rotating shaft, an outer rotor connected with the rotating shaft and an inner stator positioned between the rotating shaft and the outer rotor, wherein the inner stator comprises a stator core and a winding wound on the stator core; the method is characterized in that: the inner stator includes along circumference evenly distributed in several wire winding groove on the stator core periphery, the wire winding groove is the rectangle setting, the winding is formed by the flat wire coiling and hold in the wire winding inslot.

2. The external rotor electric machine of claim 1, wherein: the stator core is provided with a yoke ring sleeved on the outer side of the rotating shaft and a plurality of tooth parts extending outwards from the yoke ring along the radial direction, the tooth parts are evenly distributed along the circumferential direction, and the winding is wound on the tooth parts.

3. The external rotor electric machine of claim 2, wherein: the winding slots are formed between the adjacent tooth parts, and the windings are wound on the tooth parts and are contained in the winding slots.

4. The external rotor electric machine of claim 2, wherein: the free ends of the adjacent teeth extend towards each other to form a clamping groove which is communicated with the winding groove and is positioned on one side of the winding groove far away from the yoke ring.

5. The external rotor electric machine of claim 1, wherein: the rotating shaft extends along the axial direction, and the stator core is formed by a plurality of stator punching sheets in an axial stacking mode.

6. The external rotor electric machine of claim 1, wherein: the outer rotor comprises a machine shell sleeved on the outer side of the inner stator and a plurality of magnetic poles attached to the inner wall of the machine shell, and the magnetic poles are uniformly distributed along the circumferential direction.

7. The external rotor electric machine of claim 6, wherein: the outer rotor the casing is by the integrative stamping forming of metalwork, just the casing includes excircle lateral wall and is located the circular end wall of excircle lateral wall one end, circular end wall connect in the pivot, the magnetic pole laminate in the inboard of excircle lateral wall.

8. The external rotor electric machine of claim 7, wherein: the magnetic pole is composed of an outer arc, an inner arc and side edges which are symmetrical left and right and are connected with the outer arc and the inner arc, and the outer arc of the magnetic pole is attached to the inner wall of the outer circular side wall.

9. The external rotor electric machine of claim 8, wherein: the inner arc of the magnetic pole of the outer rotor and the outer arc of the winding slot of the inner stator are concentric circles, and an air gap exists between the inner arc of the magnetic pole and the outer arc of the winding slot.

10. The external rotor electric machine of claim 6, wherein: the number of the magnetic poles of the outer rotor is 8, and the number of the winding slots of the stator core is 12.