CN218771637U

CN218771637U - Protective brushless motor

Info

Publication number: CN218771637U
Application number: CN202222807074.9U
Authority: CN
Inventors: 王永辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-03-28
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses a protective brushless motor, which comprises a shell, a rotating shaft, a rotor and a stator, wherein the rotor is rotationally connected inside the shell, the rotating shaft and the rotor are coaxially fixed, and the rotating shaft extends out of the shell; the stator is fixedly connected inside the shell, and the rotor is positioned on the inner side of the stator or on the outer side of the stator; the inner cavity of the shell is sealed, and the inner cavity of the shell is filled with insulating heat conduction oil. The utility model discloses having optimized protection brushless motor's heat radiation structure, having avoided debris to get into inside the motor, utilized insulating conduction oil heat dissipation simultaneously, made the stator be in the best operating temperature.

Description

Protective brushless motor

Technical Field

The utility model relates to a motor field for electric tool, concretely relates to brushless motor.

Background

A protective brushless motor is a typical electromechanical integration product. In order to meet the heat dissipation requirement, the shell of the existing high-power and high-torque protection brushless motor is provided with a vent hole. Because there is strong magnetism in brushless motor's the rotor, if work under the operational environment of iron fillings, iron foam, cooling air can bring iron fillings, iron foam etc. into the motor inside through the ventilation hole by the absorbent object of magnet, adsorbs the rotor surface, and the radiating efficiency greatly reduced, the resistance increase continues work and finally can lead to strong magnetism to lose magnetism, and motor power can't be exported. Therefore, the existing protective brushless motor has high requirements on the environment, and the heat dissipation structure of the protective brushless motor needs to be optimized.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the heat dissipation structure of the protective brushless motor is optimized, and the failure rate is reduced. The utility model provides a protective brushless motor, which comprises a shell, a rotating shaft, a rotor and a stator, wherein the rotor is rotationally connected inside the shell, the rotating shaft and the rotor are coaxially fixed, and the rotating shaft extends out of the shell; the stator is fixedly connected inside the shell, and the rotor is positioned on the inner side of the stator or on the outer side of the stator; the inner cavity of the shell is sealed, and insulating heat conduction oil is filled in the inner cavity of the shell.

The beneficial effects of the utility model reside in that: utilize insulating conduction oil with the heat transfer to the shell of winding, and the heat of shell is passed through the surrounding air and is dispelled to make rotor and stator all be in reasonable temperature, can high-efficient continuous stable work, satisfy the heat dissipation requirement of motor. And meanwhile, the shell is not provided with the ventilation hole, so that iron chips, iron foam and other objects can be effectively prevented from entering the motor through the ventilation hole, the rotor is ensured not to lose magnetism, and the service life of the motor is prolonged.

Preferably, one or both ends of the rotating shaft extend out of the shell; the shell is provided with an end cover, the end cover is detachably connected with the shell, the end cover is rotatably connected with the rotating shaft through a bearing and an oil seal, or the shell is rotatably connected with the rotating shaft through a bearing and an oil seal; and a sealing ring is arranged between the shell and the end cover. The oil seal and the sealing ring improve the sealing performance of the inner cavity, and the leakage and overflow of the insulated heat conduction oil are avoided.

Preferably, a rotating shaft positioned outside the shell is provided with a heat dissipation fan blade. The heat dissipation fan blade blows air towards the shell, and the heat dissipation speed of the shell is increased.

Preferably, the outer part of the shell is provided with an expansion pot communicated with the inner cavity, and the expansion pot can deform. The rear end of the shell is provided with a connecting pipe communicated with the inner cavity, and the expansion pot is communicated with the connecting pipe and detachably connected with the connecting pipe. The expansion kettle and the inner cavity are filled with insulating heat conduction oil, the temperature of the insulating heat conduction oil rises along with the temperature rise of the motor, and the volume of the insulating heat conduction oil increases along with the temperature rise according to the heat syndrome and cold shrinkage principle. After the volume of the insulating heat conduction oil is increased, the expansion pot is elastically deformed, and the increased volume of the insulating heat conduction oil is balanced by means of increasing the volume of the expansion pot, so that the internal pressure of the shell is balanced, and the possibility of leakage of the insulating heat conduction oil is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is a perspective view of FIG. 1;

fig. 3 is a schematic structural diagram of the second embodiment.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

Example one

In the attached drawing of this embodiment, a housing 1, a rotor 2, a stator 3, a front end cover 4, a rear end cover 5, a front rotating shaft 6, a rear rotating shaft 7, a front oil seal 8, a rear oil seal 9, a seal ring 10, a seal gasket 11, a front bearing 12, a rear bearing 13, a heat dissipation fan blade 14, an expansion pot 15, a connecting pipe 16, a wire holder 17, and insulating heat conduction oil 18.

As shown in fig. 1, the present embodiment provides a shielded brushless motor, which includes a housing 1, a rotor 2, a stator 3, a front end cover 4, and a rear end cover 5. The stator 3 is installed inside the housing 1, the rotor 2 is rotatably connected inside the housing 1 through a front end cover 4 and a rear end cover 5, and the rotor 2 is located inside the stator 3. The protection brushless motor that this embodiment provided belongs to inner rotor motor. Specifically, a front rotating shaft 6 and a rear rotating shaft 7 are respectively arranged at two ends of the rotor 2, the front rotating shaft 6 extends out of the front end cover 4, and a front oil seal 8 is arranged between the front rotating shaft 6 and the front end cover 4. The front end cover 4 is connected to the front end of the shell 1, and a sealing ring 10 is arranged between the front end cover 4 and the shell 1. Similarly, the rear rotating shaft 7 extends out of the rear end cover 5, and a rear oil seal 9 is arranged between the rear rotating shaft 7 and the rear end cover 5. The rear end cover 5 is connected to the rear end of the shell 1, and a sealing ring 10 is arranged between the rear end cover 5 and the shell 1. The front oil seal 8 and the rear oil seal 9 are used for sealing the rotor 2, and the sealing ring 10 is used for sealing the front end cover 4 and the rear end cover 5, so that the sealing performance of the whole inner cavity is improved. The housing 1 is provided with a wire holder 17 electrically connected to the winding of the stator 3, and a gasket 11 is provided between the wire holder 17 and the housing 1. The gasket 11 ensures sealing where the wire holder 17 is mounted.

A front bearing 12 is arranged between the front rotating shaft 6 at the front end of the rotor 2 and the front end cover 4, and a rear bearing 13 is arranged between the rear rotating shaft 7 at the rear end of the rotor 2 and the rear end cover 5. The front bearing 12 and the rear bearing 13 greatly reduce the friction resistance between the rotor 2 and the front end cover 4 and the rear end cover 5, and the service life of the motor is prolonged. In addition, the rear end cover 5 and the shell 1 are integrally formed, and the rear end cover 5 and the shell 1 can also be separated and connected through bolts. Similarly, the front end cover 4 and the shell 1 are integrally formed, and the front end cover 4 and the shell 1 can also be separated and connected through bolts.

In order to solve the problem that impurities such as iron chips and iron foam enter the inside of the shell 1, the inner cavity of the shell 1 in the embodiment is sealed, and the inner cavity of the shell 1 is filled with insulating heat conduction oil 18. The heat of the winding is transferred to the shell 1 by using the insulated heat conducting oil 18, and a part of the front bearing 12 positioned outside the shell 1 is provided with a heat radiating fan blade 14. The heat dissipation fan blades 14 blow air towards the shell 1, so that the heat dissipation speed of the shell is increased, and heat of the shell 1 is dissipated through surrounding air, so that the rotor 2 and the stator 3 are both at reasonable temperature, the motor can work efficiently, continuously and stably, and the heat dissipation requirement of the motor is met. Meanwhile, the shell 1 is not provided with the ventilation hole, so that iron chips, iron foam and other objects can be effectively prevented from entering the motor through the ventilation hole, the rotor 2 is prevented from being demagnetized, and the service life of the motor is prolonged.

In addition, as the temperature of the motor rises, the temperature of the insulating heat transfer oil 18 also rises, and according to the principle of thermal contraction, the volume of the insulating heat transfer oil 18 increases with the rise of the temperature, so that the pressure inside the shell 1 increases. In order to solve this problem, as shown in fig. 1 and 2, an expansion pot 15 communicating with the inner cavity is provided outside the housing 1 and the expansion pot 15 is deformable. Specifically, the rear end of the housing 1 is provided with a connecting pipe 16 communicated with the inner cavity, and the expansion pot 15 is communicated with the connecting pipe 16 and detachably connected. When the volume of the insulating heat conducting oil 18 is increased, the expansion kettle 15 is elastically deformed, and the increased volume of the insulating heat conducting oil 18 is balanced by increasing the volume of the expansion kettle 15, so that the internal pressure of the shell 1 is balanced, and the possibility of leakage of the insulating heat conducting oil 18 is reduced.

Example two

As shown in fig. 3, in the drawings of this embodiment, a housing 1, a rotor 2, a stator 3, a rotating shaft 4, an end cover 5, an oil seal 6, a bearing 7, a seal ring 8, a seal gasket 9, a heat dissipation fan blade 10, an expansion pot 11, insulating heat conduction oil 12, and a wire holder 13.

This embodiment provides another protection brushless motor, including shell 1, pivot 4, rotor 2 and stator 3, rotor 2 rotates to be connected inside shell 1, pivot 4 stretches out from the front end of shell 1 with the coaxial fixed and one end of pivot 4 of rotor 2, rotates through bearing 7 and oil blanket 6 between shell 1 and the pivot 4 and is connected. The mouth end of shell 1 is equipped with the opening, and the opening is sealed through end cover 5, specifically sets up sealing washer 8 between shell 1 and end cover 5 and seals. The stator 3 is fixedly connected inside the shell 1, and the rotor 2 is positioned outside the stator 3. The housing 1 is provided with a wire holder 13 electrically connected with the winding of the stator 3, and a sealing gasket 9 is provided between the wire holder 13 and the housing 1. The rotating shaft 4 positioned outside the shell 1 is provided with a heat dissipation fan blade 10.

The inner cavity of the shell 1 is sealed, the inner cavity of the shell 1 is filled with insulating heat conduction oil 12, the end cover 5 of the shell 1 is communicated with an expansion pot 11, and the insulating heat conduction oil 12 and the expansion pot 11 in the embodiment have the same functions as those in the first embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. A protective brushless motor comprises a shell, a rotating shaft, a rotor and a stator, wherein the rotor is rotatably connected inside the shell, the rotating shaft and the rotor are coaxially fixed, and the rotating shaft extends out of the shell; the stator is fixedly connected inside the shell, and the rotor is positioned on the inner side of the stator or on the outer side of the stator; the method is characterized in that: the inner cavity of the shell is sealed, and the inner cavity of the shell is filled with insulating heat conduction oil.

2. A protected brushless electric machine according to claim 1, wherein: one end or two ends of the rotating shaft extend out of the shell; the shell is provided with an end cover, and the end cover is detachably connected with the shell.

3. A protected brushless electric machine according to claim 2, wherein: the end cover is rotatably connected with the rotating shaft through a bearing and an oil seal, or the shell is rotatably connected with the rotating shaft through a bearing and an oil seal.

4. A protected brushless electric machine according to claim 2, wherein: and a sealing ring is arranged between the shell and the end cover.

5. A protected brushless electric machine according to claim 1, wherein: the rotating shaft positioned outside the shell is provided with a heat dissipation fan blade.

6. A protected brushless electric machine according to claim 1, wherein: the housing is provided with a wire holder electrically connected with the winding of the stator.

7. A protected brushless electric motor according to claim 6, wherein: and a sealing gasket is arranged between the wire holder and the shell.

8. A protected brushless electric machine according to any of claims 1-7, wherein: an expansion pot communicated with the inner cavity is arranged outside the shell.

9. A protected brushless electric motor according to claim 8, wherein: the expansion pot is deformable.

10. A protected brushless electric motor according to claim 9, wherein: the rear end of the shell is provided with a connecting pipe communicated with the inner cavity, and the expansion kettle is communicated with the connecting pipe and detachably connected with the connecting pipe.