CN213151831U - Direct current brushless motor - Google Patents

Abstract

The utility model provides a brushless DC motor, which comprises a motor body and an output shaft, wherein a fan is fixedly arranged on the output shaft, a layer of protection box is fixedly arranged outside the motor body, the bottom end inside the protection box is fixedly connected with the bottom end of the motor body, the output shaft passes through the top end of the protection box, a bearing is arranged between the output shaft and the protection box, a plurality of ventilation holes are respectively arranged at the top end and the bottom end of the protection box, and a plurality of heat conducting parts are arranged on the inner wall of the protection box in an array manner; still include connecting pipe, spring, support column, heating panel and conducting strip, the connecting pipe set firmly in on the protection box inner wall, the spring set up in the connecting pipe, the support column slide set up in the connecting pipe is inside and support the spring, be equipped with the heating panel on the support column, the support column tip is equipped with the conducting strip, the conducting strip with motor body surface contact. The motor heat dissipation is good, prevents that high temperature operation from causing the damage.

Description

Direct current brushless motor

Technical Field

The utility model relates to a motor heat radiation structure field especially relates to a brushless DC motor.

Background

The brushless direct current motor is composed of a motor main body and a driver, and is a typical electromechanical integration product. A brushless motor refers to a motor without a brush and a commutator (or a slip ring), which is also called a commutator-less motor. When the motor was first produced in the nineteenth century, the practical motor was a brushless motor, i.e., an ac squirrel cage asynchronous motor, which was widely used.

When direct current brushless motor rotational speed was too fast, the motor surface can produce a large amount of heats, and general direct current brushless motor can set up some fin structures on its surface in order to fan heat, because the air of motor mounted position often does not circulate, leads to the heat to can not dispel fast, and this can lead to the motor radiating effect unsatisfactory, can cause the motor to burn out or malfunction even.

SUMMERY OF THE UTILITY MODEL

To exist not enough among the prior art, the utility model provides a DC brushless motor to solve prior art, DC brushless motor heat dissipation condition is poor, high temperature operation, the technical problem who damages even.

According to an embodiment of the utility model, a brushless DC motor comprises a motor body and an output shaft, wherein a fan is fixedly arranged on the output shaft, a layer of protection box is fixedly arranged outside the motor body, the bottom end inside the protection box is fixedly connected with the bottom end of the motor body, the output shaft passes through the top end of the protection box, a bearing is arranged between the output shaft and the protection box, a plurality of ventilation holes are respectively arranged at the top end and the bottom end of the protection box, and a plurality of heat conducting parts are arranged on the inner wall of the protection box in an array manner; still include connecting pipe, spring, support column, heating panel and conducting strip, the connecting pipe set firmly in on the protection box inner wall, the spring set up in the connecting pipe, the support column slide set up in the connecting pipe is inside and support the spring, be equipped with the heating panel on the support column, the support column tip is equipped with the conducting strip, the conducting strip with motor body surface contact.

Contrast prior art, the utility model discloses following beneficial effect has:

the output shaft of the motor body is utilized to rotate, the heat dissipation fan is additionally arranged on the output shaft, the fan rotates along with the output shaft to drive air to flow, the air is blown to the motor body, the air flow on the surface of the motor body is accelerated, and the heat can be quickly reduced; the motor body is fixed in the protection box, both protected motor body not damaged, also protect radiating fan not damaged, the ventilation hole at both ends can be guaranteed to drive the air flow when the fan rotates around the protection box, the support column of taking the spring has been set up on the protection box, the conducting strip has been connected to the support column, with conducting strip and motor body surface contact through the spring, realize that the temperature on motor body surface passes through conducting strip and support column transmission to the protection box on, the heating panel that sets up on the support column further dispels the heat with the electric fan cooperation, this sets up the heat that can reduce motor body surface fast, provide good radiating condition for motor body, prevent motor body high temperature operation and cause the damage.

Furthermore, a plurality of radiating fins are arranged on the periphery of the motor body, and the radiating fins are uniformly arranged around the motor body.

Further, the number of the radiating fins is eight.

Further, the radiating fins are strip-shaped sheets, two ends of each radiating fin are respectively located at the upper end and the lower end of the side face of the motor body, and the radiating fins are obliquely arranged on the side face of the motor body.

Furthermore, the fan comprises a protection ring and fan blades, and the protection ring is fixedly arranged at the outer ends of the fan blades.

Further, the number of the fan blades is three.

Drawings

Fig. 1 is an overall three-dimensional view of a brushless dc motor according to an embodiment of the present invention;

FIG. 2 is a three-dimensional view of the lower housing of the embodiment of the present invention;

FIG. 3 is a three-dimensional view of a heat conducting portion according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a heat conducting portion according to an embodiment of the present invention;

fig. 5 is an internal three-dimensional view of a dc brushless motor according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a dc brushless motor according to an embodiment of the present invention;

in the above drawings: 1. a motor body; 2. an output shaft; 3. a fan; 31. a guard ring; 32. a fan blade; 4. a protection box; 41. an upper housing; 42. a lower housing; 43. a vent hole; 5. a bearing; 6. a heat sink; 7. a heat conducting portion; 71. a connecting pipe; 72. a spring; 73. a support pillar; 74. a heat dissipation plate; 75. a heat conductive sheet.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

The embodiment of the present invention provides a dc brushless motor, as shown in fig. 5, comprising a motor body 1 and an output shaft 2, the structure of the motor body 1 and the output shaft 2 is prior art, and will not be described herein, the motor body 1 is made of metal shell, the output shaft 2 penetrates out from the inside of the motor body 1, a fan 3 is fixedly arranged on the output shaft 2, in order to prevent the fan 3 from rotating and affecting the rotation of the output shaft 2, the fan 3 is at a certain distance from the top of the motor body 1, the fan 3 is made of high temperature resistant and light plastic material, the fan angle of the fan 3 is set to be such that when the output shaft 2 rotates, the fan 3 rotates and blows air onto the motor body 1, as shown in fig. 1, a layer of protection box 4 is fixedly arranged outside the motor body 1, the protection box 4 is used for wrapping the motor body 1, the protection box 4 is made of metal, as shown in fig. 1, the protection box 4, the upper shell 41 and the lower shell 42 are locked through screws; the protection box 4 is also provided with parts (such as threaded holes) fixedly connected with the motor body 1 and an electrifying wire; the bottom end inside the protection box 4 is fixedly connected with the bottom end of the motor body 1 through screws, the output shaft 2 penetrates through the top end of the protection box 4, a bearing 5 is arranged between the output shaft 2 and the protection box 4, the bearing 5 can be a rolling ball bearing or a rolling needle bearing, as shown in fig. 1 and 2, and a plurality of ventilation holes 43 are formed in the top end and the bottom end of the protection box 4; as shown in fig. 2 and 6, a plurality of heat conducting parts 7 are arranged on the inner wall of the protective box in an array manner, as shown in fig. 3 and 4, the heat conducting parts 7 comprise connecting pipes 71, springs 72, supporting columns 73, heat dissipation plates 74 and heat conducting fins 75, the connecting pipe 71 is fixedly arranged on the inner wall of the protection box, the spring 72 is arranged in the connecting pipe 71, the supporting column 73 is slidably disposed inside the connecting tube 71 and abuts against the spring 72, the support column 73 is provided with a heat dissipation plate 74, the end of the support column 73 is provided with a heat conduction sheet 75, the heat conduction sheet 75 is a heat conduction material and is of an arc surface structure which can be jointed with the surface of the motor body 1, when the upper shell 41 and the lower shell 42 are closed, the heat conducting part 7 attaches the heat conducting sheet 75 to the surface of the motor body 1 under the action of the spring 72, so that the temperature of the surface of the motor body 1 is conveniently conducted to the heat conducting sheet 75, and the vent holes 43 are arranged to be holes with uniform size; the motor is arranged by utilizing the rotation of an output shaft 2 of a motor body 1, a heat-radiating fan 3 is added on the output shaft 2, the fan 3 drives air to flow along with the rotation of the output shaft 2, the air is blown to the motor body 1, the air flow on the surface of the motor body 1 is accelerated, and the heat can be quickly reduced; the motor body 1 is fixed in the protection box 4, so that the motor body 1 is protected from being damaged, the radiating fan 3 is also protected from being damaged, and the ventilation holes 43 at the front end and the rear end of the protection box 4 can ensure that the fan 3 drives air to flow when rotating; the protection box is provided with a support column 73 with a spring 72, the support column 73 is connected with a heat-conducting fin 75, the heat-conducting fin 75 is in surface contact with the motor body 1 through the spring 72, the temperature on the surface of the motor body 1 is transmitted to the protection box through the heat-conducting fin 75 and the support column 73, the heat dissipation plate 74 arranged on the support column 73 is further dissipated with the cooperation of an electric fan, the heat on the surface of the motor body 1 can be rapidly reduced through the arrangement, a good heat dissipation condition is provided for the motor body 1, and the damage caused by the high-temperature operation of the motor body 1 is prevented.

In a further scheme, as shown in fig. 5, a plurality of radiating fins 6 are arranged around the motor body 1, the radiating fins 6 are uniformly arranged around the motor body 1, the radiating fins 6 can be welded or screwed, the radiating fins 6 mainly serve to increase the radiating area on the surface of the motor body 1, and under the action of the fan 3, the surface of the motor body 1 radiates heat to a greater extent, so that the radiating efficiency is improved.

In a further scheme, the number of the radiating fins 6 is eight, the radiating fins 6 surround the periphery of the motor body 1, the number of the radiating fins is preferably eight, the surface of the motor body 1 can be completely covered, and the mounting difficulty of the radiating fins 6 on the surface of the motor body 1 cannot be increased.

In a further scheme, as shown in fig. 5, the heat sink 6 is in a strip sheet shape, two ends of the heat sink 6 are respectively located at the upper end and the lower end of the side surface of the motor body 1, the heat sink 6 is obliquely arranged on the side surface of the motor body 1, and the heat sink 6 in the strip sheet shape and obliquely arranged on the side surface of the motor body 1 can receive the wind transmitted by the fan 3 to the greatest extent, i.e., the heat dissipation rate of the heat sink 6 can be improved.

In a further scheme, as shown in fig. 5, the fan 3 includes a protective ring 31 and three fan blades 32, the number of the fan blades 32 is three, the protective ring 31 is fixedly arranged at the outer ends of the fan blades 32, and since the rotation speed of the output shaft 2 is fast, if a plurality of fan blades 32 are independently arranged on the output shaft 2, the fan blades 32 are peeled off at an excessively high speed to cause heat failure of the fan; therefore, the outer end of the fan blade 32 is fixedly connected with the protective ring 31, and the fan blade 32 structure can be fixed by the protective ring 31, so that the fan blade 32 is firm.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (6)

1. The utility model provides a brushless DC motor, includes motor body (1) and output shaft (2), its characterized in that: a fan (3) is fixedly arranged on the output shaft (2), a protection box (4) is fixedly arranged outside the motor body (1), the bottom end inside the protection box (4) is fixedly connected with the bottom end of the motor body (1), the output shaft (2) penetrates through the top end of the protection box (4), a bearing (5) is arranged between the output shaft (2) and the protection box (4), and a plurality of ventilation holes (43) are formed in the top end and the bottom end of the protection box (4); a plurality of heat conducting parts (7) are arranged on the inner wall of the protection box in an array manner; the heat conducting part (7) comprises a connecting pipe (71), a spring (72), a supporting column (73), a heat dissipation plate (74) and a heat conducting fin (75), the connecting pipe (71) is fixedly arranged on the inner wall of the protection box, the spring (72) is arranged in the connecting pipe (71), the supporting column (73) is slidably arranged inside the connecting pipe (71) and abuts against the spring (72), the heat dissipation plate (74) is arranged on the supporting column (73), the heat conducting fin (75) is arranged at the end part of the supporting column (73), and the heat conducting fin (75) is in surface contact with the motor body (1).

2. A dc brushless motor as recited in claim 1, wherein: the motor is characterized in that a plurality of radiating fins (6) are arranged on the periphery of the motor body (1), and the radiating fins (6) are uniformly arranged around the motor body (1).

3. A dc brushless motor according to claim 2, wherein: the number of the radiating fins (6) is eight.

4. A dc brushless motor according to claim 2, wherein: the heat radiating fins (6) are strip sheets, the two ends of each heat radiating fin (6) are respectively located at the upper end and the lower end of the side face of the motor body (1), and the heat radiating fins (6) are obliquely arranged on the side face of the motor body (1).

5. A dc brushless motor as recited in claim 1, wherein: the fan (3) comprises a protective ring (31) and fan blades (32), wherein the protective ring (31) is fixedly arranged at the outer ends of the fan blades (32).

6. A dc brushless motor according to claim 5, wherein: the number of the fan blades (32) is three.

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