CN216356153U

CN216356153U - Micro motor

Info

Publication number: CN216356153U
Application number: CN202123090149.8U
Authority: CN
Inventors: 张立峰; 陆智; 蔡军彪
Original assignee: Zhejiang Yunhuizhi Motor System Co ltd
Current assignee: Zhejiang Yunhuizhi Motor System Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-04-19
Anticipated expiration: 2031-12-09

Abstract

The utility model provides a micromotor which comprises a rotor assembly, a commutator and a carbon brush, wherein the rotor assembly comprises a rotor core and a rotor winding, the rotor core is uniformly provided with a plurality of rotor slots along the circumference in a penetrating manner, the number of the rotor slots is 2N, and N is a positive integer; the commutator comprises a base body and commutator segments uniformly distributed on the outer circumference of the base body; the micro motor is provided with 4 magnetic poles, the number of the commutator segments is twice that of the rotor slots, the number of the carbon brushes is two, and the two carbon brushes are arranged at 90 degrees along the axial direction of the micro motor; and each two opposite commutator segments are provided with a line hook, so that the two commutator segments which are separated by 180 degrees are short-circuited, and the tail end of each wire in the rotor winding can be connected with the commutator segment which is closer to the tail end of each wire. On the premise of meeting the performance, the weight of the micro motor is reduced by about 15%, and the micro motor can be applied to application scenes with higher voltage (more than 80V).

Description

Micro motor

Technical Field

The utility model relates to a micro motor, in particular to a micro motor with light weight and high voltage resistance.

Background

Compared with a 2-pole motor, the 4-pole motor has great advantages in weight and volume, but when the 4-pole motor adopts a lap winding, 4 carbon brushes are generally needed, and in a general application scene, in order to reduce cost, a short-circuit line mode is adopted, and the 4-pole lap winding only can use 2 carbon brushes. However, in some high-voltage application scenarios, the number of the commutator segments is often increased, which may increase the length and complexity of the winding, and increase the weight of the micro-motor, which is not favorable for the market promotion of the micro-motor.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problems, an object of the present invention is to provide a micro-motor, which has a weight reduced by about 15% and can be applied to a high voltage (80V or more) application scenario while satisfying performance requirements.

Based on the purpose, the utility model provides a micromotor, which comprises a rotor assembly, a commutator and a carbon brush, wherein the rotor assembly comprises a rotor core and a rotor winding, the rotor core is uniformly provided with a plurality of rotor grooves along the circumference, the number of the rotor grooves is 2N, and N is a positive integer; the commutator comprises a base body and commutator segments uniformly distributed on the outer circumference of the base body; the micro motor is provided with 4 magnetic poles, the number of the commutator segments is twice that of the rotor slots, the number of the carbon brushes is two, and the two carbon brushes are arranged at 90 degrees along the axial direction of the micro motor;

and each two opposite commutator segments are provided with a line hook, so that the two commutator segments which are separated by 180 degrees are short-circuited, and the tail end of each wire in the rotor winding can be connected with the commutator segment which is closer to the tail end of each wire.

Preferably, the number of the rotor slots is 18.

Preferably, each wire in the rotor winding is separated by 4 rotor slots at the inlet and outlet ends of the rotor core.

Preferably, the number of the rotor slots is 16.

Preferably, each wire in the rotor winding is separated by 3 rotor slots at the inlet end and the outlet end of the rotor core.

Preferably, the micro-machine further comprises a stator assembly, the stator assembly and the rotor assembly being coaxially disposed.

Preferably, the micromotor further comprises a machine shell, and the rotor assembly, the commutator and the carbon brush are arranged in the machine shell.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model has 4 magnetic poles, the number of the commutator bars is 2 times of the number of the rotor slots, and meanwhile, the number of the carbon brushes is reduced by adopting the short circuit, so that the weight is reduced by about 15 percent on the premise of meeting the performance, and the utility model can be applied to the application scene of higher voltage (more than 80V) and has better market competitiveness.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic diagram of the internal connections of a 4-pole 18-slot micro-machine in an embodiment of the present invention;

fig. 2 is a schematic diagram of the internal connections of a 4-pole 16-slot micro-machine in an embodiment of the present invention.

Detailed Description

The utility model is further described with reference to the following figures and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1 or fig. 2, the present embodiment provides a micro-motor, including a rotor assembly, a commutator, and a carbon brush, where the rotor assembly includes a rotor core and a rotor winding, the rotor core is uniformly provided with a plurality of rotor slots along a circumferential edge, the number of the rotor slots is 2N, where N is a positive integer; the commutator comprises a base body and commutator segments uniformly distributed on the outer circumference of the base body; the micro motor is provided with 4 magnetic poles, the number of the commutator segments is twice that of the rotor slots, the number of the carbon brushes is two, and the two carbon brushes are arranged at 90 degrees along the axial direction of the micro motor;

As a preferred embodiment, the number of rotor slots is 18, as shown in fig. 1.

As a preferred embodiment, each wire in the rotor winding is separated by 4 rotor slots at the inlet end and the outlet end of the rotor core, specifically, as shown in fig. 1, a-phase wire penetrates from the 13 th slot of the rotor slot, then penetrates from the 17 th slot of the rotor slot and is connected with the 30 th commutator segment, because of the short circuit between the 30 th commutator segment and the 12 th commutator segment, this is equivalent to that a-phase wire penetrates from the 17 th slot of the rotor slot and is connected with the 12 th commutator segment, and similarly, b-phase wire penetrates from the 13 th slot of the rotor slot, then penetrates from the 17 th slot of the rotor slot and is connected with the 29 th commutator segment, because of the short circuit between the 29 th commutator segment and the 11 th commutator segment, this is equivalent to that b-phase wire penetrates from the 17 th slot of the rotor slot and is connected with the 11 th commutator segment.

As a preferred embodiment, the number of rotor slots is 16, as shown in fig. 2.

As a preferred embodiment, each wire in the rotor winding is separated by 3 rotor slots at the inlet end and the outlet end of the rotor core; specifically, as shown in fig. 1, a phase conductor penetrates from the 11 th slot of the rotor slot, then penetrates from the 14 th slot of the rotor slot and is connected with the 25 th segment, and due to the short circuit between the 25 th segment and the 9 th segment, this is equivalent to that a phase conductor penetrates from the 14 th slot of the rotor slot and is connected with the 9 th segment, and similarly, a phase conductor penetrates from the 11 th slot of the rotor slot, then penetrates from the 14 th slot of the rotor slot and is connected with the 24 th segment, and due to the short circuit between the 24 th segment and the 8 th segment, this is equivalent to that a phase conductor penetrates from the 14 th slot of the rotor slot and is connected with the 8 th segment.

As a preferred embodiment, the micro-machine further comprises a stator assembly, the stator assembly and the rotor assembly being coaxially disposed.

As a preferred embodiment, the micro-motor further comprises a casing, and the rotor assembly, the commutator and the carbon brush are all arranged in the casing.

Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principle and spirit of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. A micromotor comprises a rotor assembly, a commutator and a carbon brush, wherein the rotor assembly comprises a rotor core and a rotor winding, the rotor core is uniformly provided with a plurality of rotor slots along the circumferential edge in a penetrating manner, the number of the rotor slots is 2N, and N is a positive integer; the commutator comprises a base body and commutator segments uniformly distributed on the outer circumference of the base body; the brushless direct current motor is characterized in that the micromotor is provided with 4 magnetic poles, the number of the commutator segments is twice that of the rotor slots, the number of the carbon brushes is two, and the two carbon brushes are arranged at 90 degrees along the axial direction of the micromotor;

2. The micromotor according to claim 1, wherein said number of rotor slots is 18.

3. The micromotor according to claim 2, wherein each wire in the rotor winding is separated by 4 rotor slots at the inlet and outlet ends of the rotor core.

4. The micromotor according to claim 1, wherein said number of rotor slots is 16.

5. The micromotor according to claim 4, wherein each wire in the rotor winding is separated by 3 rotor slots at the inlet and outlet ends of the rotor core.

6. The micro-machine of claim 1, further comprising a stator assembly, the stator assembly and the rotor assembly being coaxially disposed.

7. The micro-machine of claim 1 or 6, further comprising a housing, wherein the rotor assembly, commutator, and carbon brushes are disposed within the housing.