CN110380559B

CN110380559B - Electric motor

Info

Publication number: CN110380559B
Application number: CN201810330060.8A
Authority: CN
Inventors: 许志聪; 潘锦辉; 吴信贤
Original assignee: Yen Sun Technology Corp
Current assignee: Yen Sun Technology Corp
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2020-11-20
Anticipated expiration: 2038-04-13
Also published as: CN110380559A

Abstract

A motor comprises a bottom shell with a plurality of air guide grooves, a shell cover, a rotor, a stator and a shell cover, wherein the shell cover is arranged on the bottom shell and defines a pivoting space communicated with the air guide grooves together with the bottom shell, the rotor is rotatably arranged in the pivoting space, the stator is arranged in the pivoting space and surrounds the rotor, and the shell cover is arranged on the bottom shell in a covering mode and covers the shell cover. The rotor has a plurality of openings extending downwardly from the top surface to the bottom surface. When the rotor rotates relative to the stator, airflow can be introduced into the air guide groove to form active convection heat dissipation, so that the heat dissipation efficiency is improved, and the design of the air guide groove can avoid eddy current from being formed on the bottom shell, so that the condition of temperature rise or fault caused by the eddy current can be avoided.

Description

Electric motor

Technical Field

The present invention relates to a motor, and more particularly, to a motor having an active heat dissipation function.

Background

Referring to fig. 1, a general motor 1 includes a housing 11, a stator 12 fixedly disposed in the housing 11, and a rotor 13 rotatably disposed in the housing 11 along its axis and surrounded by the stator 12. The rotor 13 is magnetically influenced to rotate relative to the stator 12 to generate power to move other structures or components. Since both the rotors 13 and the stators 12 generate high heat when rotating relative to each other, the housing 11 is provided with a plurality of ventilation holes 111, so that air flow can enter the housing 11 to cool the stators 12 and the rotors 13, however, the ventilation holes 111 of the motor 1 can only passively enter by means of external air flow to generate convection heat dissipation, and the function of active heat dissipation is lacked. In addition, the housing 11 is designed as a whole and made of metal, and the inner surface faces the rotor 13, since the conductor generates eddy current in the changing magnetic field, the inner surface of the housing 11 made of metal is influenced by the changing magnetic field of the rotor 13 to induce electricity, so that the eddy current is generated on the housing 11, and excessive eddy current may cause overheating and block the rotor 13 from rotating.

Disclosure of Invention

The invention aims to provide a motor which has an active heat dissipation function and can avoid the shell from generating eddy current.

The motor comprises a bottom shell, a shell cover, a stator and a shell cover, wherein the bottom shell is provided with a plurality of air guide grooves extending from a top surface to a bottom surface, the shell cover is arranged on the bottom shell and defines a pivoting space communicated with the air guide grooves together with the bottom shell, the rotor is rotatably arranged in the pivoting space and positioned above the air guide grooves, the stator is arranged in the pivoting space and surrounds the rotor, the shell cover is covered on the bottom shell and covers the shell cover, and the rotor is provided with a plurality of openings penetrating from the top surface to the bottom surface.

Preferably, in the motor, the housing has a coupling portion coupled to the bottom case, an outer annular wall portion annularly disposed on the coupling portion and forming at least one through opening, and a top wall portion connected to a top edge of the outer annular wall portion.

Preferably, in the motor, the bottom case has a bottom wall portion forming the air guide groove, and a surrounding wall portion connecting the bottom wall portion and surrounding the stator.

Preferably, in the motor, the housing cover is made of copper and has a top surface contacting an inner wall surface of the housing cover.

The invention has the beneficial effects that: the rotor is provided with a plurality of openings, so when the rotor rotates relative to the stator, air in the openings can be forced to flow due to rotation, an active air suction effect is generated, air flow can be introduced from the air guide groove, air below is upwards extracted through the openings, then the air downwards passes through the gap on the stator, and finally the air is sent out from the air guide groove, active convection heat dissipation can be formed, and heat dissipation efficiency is improved. Furthermore, the wind guide groove is arranged below the rotor, so that the area of the bottom shell influenced by the magnetic field of the rotor can be reduced, and in addition, the bottom shell is cut by the wind guide groove instead of a complete plane, induced current is not easy to generate on the bottom shell, so that the generation of eddy current can be avoided.

Drawings

FIG. 1 is a schematic diagram illustrating a typical motor;

FIG. 2 is an exploded perspective view illustrating an embodiment of the motor of the present invention;

FIG. 3 is a perspective view illustrating the assembled components of the embodiment;

FIG. 4 is a cross-sectional view illustrating a cross-sectional aspect of the embodiment;

FIG. 5 is a top view illustrating a top view of the embodiment with the housing omitted;

fig. 6 is a schematic view illustrating a path of air flow in the present embodiment.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 2, 3, and 4, an embodiment of the motor 2 of the present invention includes a bottom housing 21, a housing cover 22 disposed on the bottom housing 21 and defining a pivot space 220 together with the bottom housing 21, a rotor 23 rotatably disposed in the pivot space 220, a stator 24 disposed in the pivot space 220 and surrounding the rotor 23, and a housing cover 25 disposed on the bottom housing 21 and covering the housing cover 22.

Referring to fig. 2, 4 and 5, it should be noted that the housing cover 25 is omitted in fig. 5 for convenience of describing the form of the housing cover 22. The bottom housing 21 has a bottom wall 211 for carrying the rotor 23 and the stator 24, and a surrounding wall 212 connected to an outer periphery of the bottom wall 211 to surround the stator 24. The bottom wall 211 has a plurality of wind guide grooves 213 extending from the top surface to the bottom surface and communicating with the pivot space 220. The housing cover 22 not only has a hole 221 through which the rotor 23 can pass, but also does not completely shield the rotor 23 and the stator 24 as shown in fig. 5, so the pivot space 220 is not closed, the top surface of the housing cover 22 contacts the inner wall surface of the housing cover 25, the housing cover 22 is not completely circular and has a notch, the housing cover 22 is made of copper and can be electrically connected with a plurality of electronic components 3 arranged at the notch, and heat generated by the electronic components 3 during operation can be transferred to the housing cover 22 through a contact conduction manner to achieve the effect of heat dissipation. The rotor 23 has a plurality of openings 231 penetrating from the top surface to the bottom surface and arranged in a ring shape with equal angles. The housing 25 has a coupling portion 251 coupled to the bottom case 21 in a locking manner around the top edge of the wall portion 212, an outer annular wall portion 253 surrounding the coupling portion 251 and having two through holes 252 formed on the outer peripheral surface thereof, and a top wall portion 254 connected to the top edge of the outer annular wall portion 253 and spaced apart from the bottom wall portion 211 of the bottom case 21 in the vertical direction. The through holes 252 are for the conductive wires to enter to electrically connect the electronic components 3 on the housing cover 22.

Referring to fig. 2, 5, and 6, when the rotor 23 rotates relative to the stator 24, the air in the opening 231 flows due to the rotation, and the air guiding groove 213 communicating with the outside is disposed at the lower portion, so that the outside air is driven to enter the pivoting space 220 through the air guiding groove 213 and flows upward to the cover 22 through the opening 231, and then the air flowing along the bottom surface of the cover 22 flows downward through the gap on the stator 24 and finally flows to the outside through the air guiding groove 213 at the bottom, thereby achieving the effect of actively drawing the air flow to generate convection heat dissipation. Since the housing cover 22 is made of copper, the heat in the flowing air contacting the housing cover can be absorbed through the bottom surface, the heat on the electronic component 3 can be absorbed through contact conduction, and the top surface is attached to the inner wall surface of the top wall 254 of the housing cover 25, so that the heat is conducted to the housing cover 25, the heat energy is dissipated from the housing cover 25 to the outside, and the heat dissipation effect is enhanced.

In addition, the wind guiding groove 213 is located right below the rotor 23, so the contact area between the top surface of the bottom wall 211 and the magnetic field generated by the rotor 23 is small, and the wind guiding groove 213 makes the bottom wall 211 not a complete plane, so that an induced current is not easy to generate thereon, thereby avoiding the generation of eddy current and avoiding heat generation and other related problems.

In summary, when the rotor 23 rotates relative to the stator 24, airflow can be introduced from the outside to actively dissipate heat of the rotor 23 and the stator 24, and the design of the air guiding groove 213 can avoid the bottom case 21 from generating eddy current, so the object of the present invention can be achieved.

Claims

1. An electric motor characterized by: the motor comprises a bottom shell with a plurality of air guide grooves extending from a top surface to a bottom surface, a shell cover arranged on the bottom shell and defining a pivoting space communicated with the air guide grooves together with the bottom shell, a rotor rotatably arranged in the pivoting space and positioned above the air guide grooves, a stator arranged in the pivoting space and surrounding the rotor, and a shell cover covered on the bottom shell and covering the shell cover, wherein the shell cover is provided with a notch for electrically connecting a plurality of electronic components arranged at the notch, the rotor is provided with a plurality of openings penetrating from the top surface to the bottom surface, when the rotor rotates relative to the stator, air in the openings is forced to flow due to rotation to generate active suction, so that the external air is driven to enter the pivoting space from the air guide grooves, and the air below is upwards extracted through the openings and flows upwards to the shell cover, the air flowing along the bottom surface of the shell cover downwards passes through the gap on the stator and finally flows to the outside again through the air guide groove.

2. The motor of claim 1, wherein: the shell cover is provided with a combination part combined on the bottom shell body, an outer annular wall part which is annularly arranged on the combination part and forms at least one through hole, and a top wall part connected to the top edge of the outer annular wall part.

3. The motor of claim 2, wherein: the bottom shell is provided with a bottom wall part forming the air guide groove and a surrounding wall part connected with the bottom wall part and surrounding the stator.

4. The motor of claim 1, wherein: the shell cover is made of copper, and the top surface of the shell cover is attached to the inner wall surface of the shell cover.