CN215817822U

CN215817822U - Motor shaft heat abstractor for brushless DC motor

Info

Publication number: CN215817822U
Application number: CN202121994471.0U
Authority: CN
Inventors: 金三明; 付鹏程
Original assignee: Shenzhen Yinuo Micromotor Co ltd
Current assignee: Shenzhen Yinuo Micromotor Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2022-02-11
Anticipated expiration: 2031-08-24

Abstract

The utility model provides a motor shaft heat dissipation device for a brushless direct current motor, and relates to the technical field of brushless direct current motors. This product has designed the radiating groove that spirals on the motor shaft surface, and the direction of spiraling of radiating groove is the same with the direction of rotation of motor shaft, and at the rotation in-process of motor shaft, the radiating groove that spirals accelerates the flow of air, inside exporting the heat that the motor shaft gived off the motor, under the condition that does not influence the motor original performance, carried out the effective heat dissipation of motor shaft.

Description

Motor shaft heat abstractor for brushless DC motor

Technical Field

The utility model relates to the technical field of brushless direct current motors, in particular to a motor shaft heat dissipation device for a brushless direct current motor.

Background

The motor is widely applied to various mechanical equipment and industrial production processes, and the motor generates heat all the time due to energy loss and low energy efficiency. The most main heat dissipation mode is heat dissipation through conductive cooling, and the heat dissipation mode of the motor shaft mostly uses a hollow shaft mode, water is filled in the hollow shaft for cooling, but the strength of the hollow shaft is lower, and the requirements on materials are more and more strict under the higher rotating speed requirements of the motor.

An ERPM motor, also called an outer rotor motor, can provide a larger torque by means of an outer rotor, but because a motor shaft and a stator of a rotor are both located inside the motor and a rotor housing is surrounded outside, heat dissipation is more difficult than that of a common motor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a motor shaft heat dissipation device for a brushless direct current motor.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a brushless DC motor shaft heat abstractor, includes motor shaft and rotor housing, rotor housing inner wall circumference array gomphosis is fixed with the permanent magnet, the nested rotation piece that is fixed with in motor shaft middle part, the motor shaft is through rotating a piece gomphosis in stator center department to rotate with the stator and be connected, the motor shaft passes through the centre of a circle department of mounting welded fastening in rotor housing inner bottom, the one end welded fastening that rotor housing was kept away from to the motor shaft has the output shaft, the radiating groove has been seted up to motor shaft surface spiral, and the radiating groove is the blind groove, and multichannel radiating groove circumference array is on the motor shaft surface, the radiating groove direction of spiraling is the same with the rotation direction of motor shaft.

Preferably, a heat dissipation fan blade is arranged between the rotor shell and the rotating part, and the heat dissipation fan blade is nested on the surface of the motor shaft. The design that the heat dissipation fan blades are located inside the rotor shell drives the heat dissipation fan blades to rotate along with the heat dissipation fan blades in the rotating process of the motor shaft, so that the flow of air is accelerated, and the motor is effectively cooled.

Preferably, the surface of the rotor shell is provided with a heat dissipation port, and the heat dissipation port penetrates through the rotor shell. Through the thermovent that rotor case surface was seted up, discharge the motor with the air that radiating fan blade was bloated with higher speed, guaranteed the circulation of air, accelerated the heat dissipation.

Preferably, the surface of the heat dissipation port is covered with a filter screen. The design of filter screen when guaranteeing motor circulation of air, prevents inside dust, debris etc. get into the motor from the thermovent, has prolonged the life of motor.

Preferably, the thermistor is arranged on the circumference of the surface of the rotating part in an array mode, the thermistor is embedded in the surface of the rotating part, and the thermistor is connected in series in a main power supply circuit of the motor. The thermistor can monitor the heat of the inner cavity of the stator, and when the heat of the inner cavity of the stator is too high, the thermistor can cut off a power supply circuit of the motor, so that the motor stops working, and the motor is prevented from overheating to cause faults or even cause dangers.

Preferably, the surface of the output shaft is fixedly welded with a limiting block.

Advantageous effects

1. In the prior art, a motor shaft and a stator of a rotor of an outer rotor motor are both positioned inside the motor, and a rotor shell is surrounded outside the motor, so that heat dissipation is more difficult than that of a common motor, if effective heat dissipation is required, if a heat conduction type heat dissipation mode is used, the motor shaft is in friction contact with a fixed conduction heat dissipation piece, extra energy consumption is brought in rotation, and larger friction heat is brought, if a hollow shaft mode is used, the strength of the hollow motor shaft can not reach the standard for high-speed rotation of the motor, aiming at the problems, a spiral heat dissipation groove is designed on the surface of the motor shaft, the spiral direction of the heat dissipation groove is the same as the rotation direction of the motor shaft, in the rotation process of the motor shaft, the spiral heat dissipation groove accelerates the flow of air, the heat dissipated by the motor shaft is led out of the inside the motor, and the original performance of the motor is not influenced, effective heat dissipation of the motor shaft is performed.

2. In the utility model, the design of the fan heat-dissipating fan blades and the heat-dissipating ports is also carried out, the heat-dissipating fan blades are arranged in the rotor shell, and in the rotating process of the motor shaft, the heat-dissipating fan blades are driven to rotate along with the motor shaft, so that the flow of air is accelerated, and the motor is effectively cooled; and the heat dissipation port arranged on the surface of the rotor shell can accelerate the air blown by the heat dissipation fan blades to be discharged out of the motor, thereby ensuring the circulation of the air and accelerating the heat dissipation. Simultaneously, still carried out the design of filter screen on the thermovent surface, when guaranteeing motor circulation of air, prevent inside dust, debris etc. from getting into the motor from the thermovent, prolonged the life of motor.

3. According to the utility model, the thermistor can monitor the heat of the inner cavity of the stator, and when the heat of the inner cavity of the stator is too high, the thermistor can cut off a power supply circuit of the motor, so that the motor stops working, and the motor is prevented from being overheated to cause faults and even danger.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of a rotor housing according to the present invention;

FIG. 3 is a schematic view of a motor shaft and its components in the present invention;

FIG. 4 is a schematic view of the combination of the rotor and the thermistor according to the present invention.

Illustration of the drawings:

1. a motor shaft; 2. an output shaft; 3. a limiting block; 4. a rotor housing; 5. a permanent magnet; 6. a heat dissipation port; 7. filtering with a screen; 8. a fixing member; 9. a rotating member; 10. a heat sink; 11. a heat dissipation fan blade; 12. a thermistor.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the utility model easily understood, the utility model is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the utility model, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.

Specific embodiments of the present invention are described below with reference to the accompanying drawings.

The specific embodiment is as follows:

referring to fig. 1-4, a heat dissipation device of a motor shaft 1 for a brushless direct current motor comprises a motor shaft 1 and a rotor shell 4, permanent magnets 5 are embedded and fixed in a circumferential array on the inner wall of the rotor shell 4, a rotating part 9 is embedded and fixed in the middle of the motor shaft 1, the motor shaft 1 is embedded and connected with the center of a stator through the rotating part 9 and is connected with the stator in a rotating mode, the motor shaft 1 is fixed in the center of a circle of an inner bottom of the rotor shell 4 through a fixing part 8 in a welding mode, an output shaft 2 is fixed in one end, far away from the rotor shell 4, of the motor shaft 1, a heat dissipation groove 10 is spirally formed in the surface of the motor shaft 1, the heat dissipation grooves 10 are blind grooves, the circumferential array of the heat dissipation grooves 10 is arranged on the surface of the motor shaft 1, and the spiral direction of the heat dissipation grooves 10 is the same as the rotating direction of the motor shaft 1. In the prior art, a motor shaft 1 and a stator of a rotor of an outer rotor motor are both positioned inside the motor, and a rotor shell 4 is surrounded outside the motor, so that heat dissipation is more difficult than that of a common motor, if effective heat dissipation is required, if a heat conduction type heat dissipation mode is used, the motor shaft 1 is in friction contact with a fixed heat dissipation piece, extra energy consumption is brought in rotation, and larger friction heat is also brought, if a hollow shaft mode is used, the strength of the hollow motor shaft 1 may not reach the standard for high-speed rotation of the motor, aiming at the problems, the spiral heat dissipation groove 10 is designed on the surface of the motor shaft 1, the spiral direction of the heat dissipation groove 10 is the same as the rotation direction of the motor shaft 1, in the rotation process of the motor shaft 1, the spiral heat dissipation groove 10 accelerates the flow of air, and the heat dissipated by the motor shaft 1 is guided out of the motor, the effective heat dissipation of the motor shaft 1 is performed without affecting the original performance of the motor.

Specifically, a heat dissipation fan blade 11 is arranged between the rotor housing 4 and the rotating member 9, and the heat dissipation fan blade 11 is embedded on the surface of the motor shaft 1. The design that the heat dissipation fan blades 11 are located inside the rotor housing 4 drives the heat dissipation fan blades 11 to rotate along with the rotation of the motor shaft 1, so that the flow of air is accelerated, and the motor is effectively cooled.

Specifically, the surface of the rotor housing 4 is provided with a heat dissipation port 6, and the heat dissipation port 6 penetrates through the rotor housing 4. Through the heat dissipation port 6 formed in the surface of the rotor shell 4, air blown by the heat dissipation fan blades 11 is exhausted out of the motor in an accelerated manner, circulation of air is guaranteed, and heat dissipation is accelerated.

Specifically, the surface of the heat dissipation opening 6 is covered with a filter screen 7. The design of filter screen 7 when guaranteeing motor circulation of air, prevents inside dust, debris etc. from getting into the motor from thermovent 6, has prolonged the life of motor.

Specifically, the thermistor 12 is circumferentially arrayed on the surface of the rotating member 9, and the thermistor 12 is embedded on the surface of the rotating member 9, and the thermistor 12 is connected in series in the main power supply circuit of the motor. Thermistor 12 can monitor the heat of stator inner chamber, and when the heat of stator inner chamber was too high, thermistor 12 can cut off the supply circuit of motor for the motor stop work prevents that the motor from overheated initiation trouble or even causing danger.

Specifically, the surface of the output shaft 2 is welded and fixed with a limiting block 3.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a brushless DC motor is with motor shaft (1) heat abstractor, includes motor shaft (1) and rotor housing (4), rotor housing (4) inner wall circumference array gomphosis is fixed with permanent magnet (5), motor shaft (1) middle part nestification is fixed with rotates piece (9), motor shaft (1) is located in the stator center through rotating piece (9) gomphosis to rotate with the stator and be connected its characterized in that: motor shaft (1) is through the centre of a circle department of mounting (8) welded fastening in rotor housing (4) inner bottom, the one end welded fastening that rotor housing (4) were kept away from in motor shaft (1) has output shaft (2), radiating groove (10) have been seted up to motor shaft (1) surperficial spiral, and radiating groove (10) are the blind slot, and multichannel radiating groove (10) circumference array is on motor shaft (1) surface, radiating groove (10) spiral direction is the same with the rotation direction of motor shaft (1).

2. The heat dissipating device of a motor shaft (1) for a brushless dc motor according to claim 1, wherein: and a heat dissipation fan blade (11) is arranged between the rotor shell (4) and the rotating piece (9), and the heat dissipation fan blade (11) is nested on the surface of the motor shaft (1).

3. The heat dissipating device of a motor shaft (1) for a brushless dc motor according to claim 1, wherein: the surface of the rotor shell (4) is provided with a heat dissipation port (6), and the heat dissipation port (6) penetrates through the rotor shell (4).

4. The heat sink for the motor shaft (1) of a brushless dc motor according to claim 3, characterized in that: the surface of the heat dissipation opening (6) is covered with a filter screen (7).

5. The heat dissipating device of a motor shaft (1) for a brushless dc motor according to claim 1, wherein: the thermistor (12) is arrayed on the surface circumference of the rotating piece (9), the thermistor (12) is embedded in the surface of the rotating piece (9), and the thermistor (12) is connected in series in a main power supply circuit of the motor.

6. The heat dissipating device of a motor shaft (1) for a brushless dc motor according to claim 1, wherein: and a limiting block (3) is fixedly welded on the surface of the output shaft (2).