CN114039439A

CN114039439A - Outer rotor structure and outer rotor brushless motor

Info

Publication number: CN114039439A
Application number: CN202111502499.2A
Authority: CN
Inventors: 吴德业
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-02-11

Abstract

The invention discloses an outer rotor structure and an outer rotor brushless motor, which comprise a rotor bracket and are characterized in that: the rotor support is characterized in that a supporting column is arranged at the center inside the rotor support along the axial direction of the rotor support, the supporting column is used for being connected with the stator support, an annular rotor magnetic yoke is arranged on the inner side wall of the rotor support, the rotor magnetic yoke is coaxial with the supporting column, multiple groups of magnetic poles are arranged on the inner side of the rotor magnetic yoke at equal intervals along the circumferential direction of the rotor magnetic yoke, and the rotor magnetic yoke is formed by axially stacking multiple groups of annular silicon steel sheets. The outer rotor structure and the rotor magnetic yoke of the outer rotor brushless motor are formed by stacking a plurality of silicon steel sheets, so that the eddy current loss is smaller, the heat productivity is smaller, the deformation is smaller, the dynamic balance is smaller when the motor operates, and the performance of the motor can be obviously improved.

Description

Outer rotor structure and outer rotor brushless motor

Technical Field

The invention relates to the technical field of brushless motors, in particular to an outer rotor structure and an outer rotor brushless motor.

Background

The outer rotor brushless motor structure mainly comprises an inner stator and an outer rotor, compared with an inner rotor motor, the outer rotor brushless motor has the advantages that the effective armature diameter is larger, the load capacity of the outer rotor motor is high under the same motor length, and the outer rotor brushless motor is widely applied to various industries.

The rotor magnetic yoke of the existing outer rotor brushless motor is an integrated rotor magnetic yoke manufactured by processing seamless steel pipes. When the motor runs, the integrated rotor magnetic yoke has the defects of large eddy current loss, serious heating, large deformation, large dynamic balance and the like, and has adverse effect on the performance of the motor and needs to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an outer rotor structure and a brushless motor with the outer rotor, which have the advantages of small eddy current loss, small heat productivity, small deformation, small dynamic balance and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides an external rotor structure, includes the rotor spider, the inside center of rotor spider is provided with the pillar along its axial, the pillar is used for being connected with stator support, annular rotor yoke is equipped with on the inside wall of rotor spider, rotor yoke is coaxial with the pillar, the inboard of rotor yoke is equipped with the multiunit magnetic pole along its circumference equidistant, the rotor yoke is piled up by multiunit annular silicon steel sheet axial and is constituted.

As a preferable scheme: the magnetic poles protrude out of the inner side wall of the rotor support towards the center of the rotor support.

As a preferable scheme: a sunken slot position is formed in the inner side of the rotor magnetic yoke, and the magnetic pole is fixed in the slot position.

As a preferable scheme: the end of the strut is provided with an inner mounting hole for fixing the bearing fixing cover.

As a preferable scheme: and an inner mounting hole for fixing the blade is formed in the outer part of the rotor bracket.

The utility model provides an outer rotor brushless motor, includes outer rotor structure, still includes stator structure, stator structure includes stator support, is fixed in stator core and the stator coil of winding on stator core on the stator support, the inside center of stator support is provided with the sleeve along its axial, the pillar inserts in the sleeve, be equipped with the bearing between pillar and the sleeve, be provided with the bearing fixed lid in the sleeve, the tip of pillar is fixed in to the bearing fixed lid, bearing fixed lid gland bush, magnetic pole and rotor yoke encircle in stator core's the outside.

Compared with the prior art, the invention has the advantages that: the outer rotor structure and the rotor magnetic yoke of the outer rotor brushless motor are formed by stacking a plurality of silicon steel sheets, so that the eddy current loss is smaller, the heat productivity is smaller, the deformation is smaller, the dynamic balance is smaller when the motor operates, and the performance of the motor can be obviously improved.

Drawings

Fig. 1 is a schematic internal structural view of an outer rotor structure according to a first embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic external structural view of an outer rotor structure according to a first embodiment;

fig. 4 is a sectional view of the outer rotor brushless motor according to the second embodiment.

Description of reference numerals: 1. a rotor support; 2. a rotor yoke; 3. a magnetic pole; 4. a pillar; 5. an outer mounting hole; 6. an inner mounting hole; 7. a slot position; 8. a stator support; 9. a sleeve; 10. a bearing; 11. a bearing fixing cover; 12. a stator core; 13. and a stator coil.

Detailed Description

The first embodiment is as follows:

referring to fig. 1 and 2, an outer rotor structure includes a cup-shaped rotor support 1, a pillar 4 is disposed at the center of the inside of the rotor support 1 along the axial direction thereof, the pillar 4 is used for connecting with a stator support 8, an annular rotor yoke 2 is mounted on the inner side wall of the rotor support 1, the rotor yoke 2 is coaxial with the pillar 4, and a plurality of sets of magnetic poles 3 are mounted on the inner side of the rotor yoke 2 along the circumferential direction thereof at equal intervals.

The rotor yoke 2 in this embodiment is formed by axially stacking a plurality of groups of annular silicon steel sheets.

Compare in integral type rotor yoke 2, adopt behind the new construction rotor yoke 2 that the multi-disc silicon steel sheet piled up, can make the motor operation eddy current loss littleer, calorific capacity littleer, deformation littleer, dynamic balance volume littleer, can show the performance that promotes the motor.

In this embodiment, the magnetic poles 3 protrude from the inner sidewall of the rotor frame 1 toward the center of the rotor frame 1, so that the rotor frame 1 can be prevented from interfering with the magnetic field inside the outer rotor.

In addition, a sunken slot position 7 is arranged on the inner side of the rotor magnetic yoke 2, and the magnetic pole 3 is fixed in the slot position 7. The structure increases the contact area between the magnetic poles 3 and the rotor magnetic yoke 2, enhances the magnetic flux between the magnetic poles 3 and improves the magnetic field intensity; in addition, the magnetic poles 3 can be fixed to the rotor yoke 2 more stably and reliably.

As shown in fig. 1, an inner mounting hole 6 is provided at an end of the column 4, and the inner mounting hole 6 is used to fix the bearing fixing cover 11.

As shown in fig. 3, an outer mounting hole 5 is provided at the outside of the rotor frame 1, and the outer mounting hole 5 is used for fixing the blade.

Example two:

referring to fig. 4, an external rotor brushless motor includes an external rotor structure in the first embodiment, which includes a stator structure, the stator structure includes a cup-shaped stator support 8, a stator core 12 fixed on the stator support 8, and a stator coil 13 wound on the stator core 12, a sleeve 9 is disposed at the center inside the stator support 8 along the axial direction thereof, a pillar 4 is inserted into the sleeve 9, a bearing 10 is disposed between the pillar 4 and the sleeve 9, so that the pillar 4 can rotate relative to the sleeve 9, a bearing fixing cover 11 is disposed in the sleeve 9, the bearing fixing cover 11 is fixed at the end of the pillar 4 by a positioning bolt, the bearing fixing cover 11 compresses the bearing 10, and the magnetic pole 3 and the rotor yoke 2 are wound around the outside of the stator core 12.

When the motor is in operation, the eddy current loss is smaller, the heat productivity is smaller, the deformation is smaller, the dynamic balance is smaller, and the performance is obviously improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides an outer rotor structure, includes the rotor support, characterized by: the rotor support is characterized in that a supporting column is arranged at the center inside the rotor support along the axial direction of the rotor support, the supporting column is used for being connected with the stator support, an annular rotor magnetic yoke is arranged on the inner side wall of the rotor support, the rotor magnetic yoke is coaxial with the supporting column, multiple groups of magnetic poles are arranged on the inner side of the rotor magnetic yoke at equal intervals along the circumferential direction of the rotor magnetic yoke, and the rotor magnetic yoke is formed by axially stacking multiple groups of annular silicon steel sheets.

2. The external rotor construction of claim 1, wherein: the magnetic poles protrude out of the inner side wall of the rotor support towards the center of the rotor support.

3. The external rotor construction of claim 1, wherein: a sunken slot position is formed in the inner side of the rotor magnetic yoke, and the magnetic pole is fixed in the slot position.

4. The external rotor construction of claim 1, wherein: the end of the strut is provided with an inner mounting hole for fixing the bearing fixing cover.

5. The external rotor construction of claim 1, wherein: and an inner mounting hole for fixing the blade is formed in the outer part of the rotor bracket.

6. An outer rotor brushless motor comprising the outer rotor structure according to any one of claims 1 to 5, characterized in that: still include stator structure, stator structure includes stator support, is fixed in stator core and the stator coil of winding on stator core on the stator support, the inside center of stator support is provided with the sleeve along its axial, the pillar inserts in the sleeve, be equipped with the bearing between pillar and the sleeve, be provided with the fixed lid of bearing in the sleeve, the fixed lid of bearing is fixed in the tip of pillar, the fixed lid gland bush bearing of bearing, magnetic pole and rotor yoke encircle in stator core's the outside.