CN115765284A - Motor radiating assembly and motor - Google Patents

Abstract

The invention provides a motor heat radiation component and a motor, wherein the motor heat radiation component comprises: the gas exhaust device comprises a rotating shaft, a shell, a first end cover and a second end cover, wherein a hollow flow passage is arranged inside the rotating shaft, a gas inlet and a gas outlet are further arranged on the rotating shaft, the gas inlet is communicated with one end of the hollow flow passage to enable the hollow flow passage to be air-in, the gas outlet is communicated with the other end of the hollow flow passage to enable gas in the hollow flow passage to be exhausted, the gas inlet is formed in one side, away from the second end cover, of the first end cover to enable the gas to be air-in from the outside of the first end cover, and the gas outlet is formed in one side, away from the first end cover, of the second end cover to enable the gas to be exhausted from the outside of the second end cover. According to the invention, the heat dissipation and cooling effects of the interior of the motor can be improved, the sealing performance of the interior of the motor can be ensured, and the high protection level of the motor is ensured.

Description

Motor heat dissipation assembly and motor

Technical Field

The invention relates to the technical field of motors, in particular to a motor heat dissipation assembly and a motor.

Background

The servo motor is widely applied to the field of robots and is a power source of the robots. With the continuous development of the robot market, the servo motor not only has the characteristics of high protection grade and high reliability, but also continuously improves the power. However, the improvement of power means the rise of temperature rise, and according to the structural characteristics of the inner rotor servo motor, the heat dissipation of the stator winding mainly depends on the heat exchange between the shell and the external air, but because of the high protection level requirement of the servo motor, the conventional inner rotor structure is basically isolated from the external air, the heat of the rotor component can only be transferred through the bearing and the air in the motor, the heat is difficult to dissipate, and the permanent magnet in the rotor is easy to demagnetize under a high-temperature environment, so that the reliability of the servo motor is influenced. Therefore, the invention provides the forced air cooling high-protection servo motor aiming at the problem that the heat dissipation of the rotor is difficult.

Because the servo motor in the prior art has high protection level requirements, the inner rotor structure is basically isolated from the outside air, the heat of the rotor part can only be transferred by the bearing and the air in the motor, the heat is difficult to dissipate, and the permanent magnet in the rotor is easy to demagnetize in a high-temperature environment, so that the reliability of the servo motor is influenced, and the like.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects that the servo motor in the prior art has poor heat dissipation performance of an inner rotor structure, so that the permanent magnet is easy to demagnetize, and the reliability of the servo motor is affected, thereby providing the motor heat dissipation assembly and the motor.

In order to solve the above problems, the present invention provides a motor heat dissipation assembly, which includes:

the gas exhaust device comprises a rotating shaft, a shell, a first end cover and a second end cover, wherein a hollow flow passage is arranged inside the rotating shaft, a gas inlet and a gas outlet are further arranged on the rotating shaft, the gas inlet is communicated with one end of the hollow flow passage to enable the hollow flow passage to be air-in, the gas outlet is communicated with the other end of the hollow flow passage to enable gas in the hollow flow passage to be exhausted, the gas inlet is formed in one side, away from the second end cover, of the first end cover to enable the gas to be air-in from the outside of the first end cover, and the gas outlet is formed in one side, away from the first end cover, of the second end cover to enable the gas to be exhausted from the outside of the second end cover.

In some embodiments, the exhaust fan further comprises a rotary impeller and an exhaust end cover, the rotary impeller is sleeved on the rotating shaft and can rotate along with the rotating shaft integrally, the rotary impeller is arranged on one side, far away from the first end cover, of the second end cover, the exhaust end cover is arranged on the periphery of the rotating shaft and connected with the second end cover, an exhaust cavity is formed inside the exhaust end cover, the rotary impeller is arranged in the exhaust cavity, and the gas outlet is communicated with the exhaust cavity.

In some embodiments, the rotary impeller is a centrifugal impeller, and a peripheral wall of the exhaust end cover, which is opposed to a radially outer side of the centrifugal impeller, is formed with an exhaust hole therethrough, the exhaust hole communicating with the exhaust chamber.

In some embodiments, one axial end of the rotating shaft penetrates through the first end cover, the gas inlet is arranged at one axial end of the rotating shaft, the hollow flow passage extends to one axial end of the rotating shaft and is communicated with the gas inlet, the other axial end of the rotating shaft penetrates through the air exhaust end cover, one end of the gas outlet is communicated with the hollow flow passage, the other end of the gas outlet is communicated with the air exhaust cavity, the gas outlet is a straight flow passage, and an included angle larger than 0 is formed between the central axis of the gas outlet and the central axis of the rotating shaft.

In some embodiments, the gas outlet is provided in plurality and is sequentially spaced along a circumferential direction of the rotating shaft.

In some embodiments, the motor rotor further comprises a heat conduction inner pipe, the heat conduction inner pipe is arranged in the hollow flow channel and at least faces the motor rotor, a second hollow flow channel is arranged inside the heat conduction inner pipe, the second hollow flow channel penetrates from one axial end of the heat conduction inner pipe to the other axial end of the heat conduction inner pipe, the second hollow flow channel is communicated with the hollow flow channel, and the heat conduction inner pipe can realize contact type heat conduction on the motor rotor.

In some embodiments, the heat conduction inner tube includes an inner tube main body and a heat conduction rib, the inner tube main body is a cylindrical structure, one end of the heat conduction rib is arranged on the outer wall of the inner tube main body, and the other end of the heat conduction rib protrudes outwards, a through groove is arranged at a position of the rotating shaft opposite to the heat conduction inner tube, the through groove penetrates through the inner wall to the outer wall of the rotating shaft, and the heat conduction rib penetrates through the through groove and can be in contact with the motor rotor.

In some embodiments, the heat conduction ribs are multiple, the heat conduction ribs are sequentially arranged at intervals in the circumferential direction of the outer wall of the inner pipe main body, the through grooves are multiple, the through grooves are sequentially arranged at intervals in the circumferential direction of the rotating shaft, and the heat conduction ribs and the through grooves are matched one by one.

In some embodiments, the inner wall of the heat conducting inner tube is provided with a groove to form a heat dissipation groove; and/or the heat conduction inner pipe is made of copper alloy.

The invention further provides a motor, which comprises the motor heat dissipation assembly, a motor rotor and a motor stator, wherein the motor rotor is sleeved on the periphery of the rotating shaft, the motor stator is positioned on the periphery of the motor rotor, and the motor rotor and the motor stator are arranged in a space formed by the shell, the first end cover and the second end cover.

In some embodiments, the motor further comprises a brake rotor and a brake stator, the brake rotor and the brake stator are disposed between the first end cover and the motor stator, the motor further comprises an encoder and an encoder cover, the encoder cover is connected to a side of the first end cover away from the second end cover, the encoder cover is disposed on the periphery of the rotating shaft, an encoder space is formed inside the encoder cover, and the encoder is disposed on the periphery of the rotating shaft and located in the encoder space.

The invention provides a motor heat dissipation assembly and a motor, which have the following beneficial effects:

1. according to the invention, the hollow flow passage is formed in the motor rotating shaft, the gas inlet at one end of the hollow flow passage is positioned at one side of the first end cover, which is far away from the second end cover, and the gas outlet at the other end of the hollow flow passage is positioned at one side of the second end cover, which is far away from the first end cover;

2. the heat conduction inner pipe is arranged in the hollow flow channel of the rotating shaft and opposite to the motor rotor, so that gas can be conducted through the hollow flow channel II in the heat conduction inner pipe, the heat conduction effect on the motor rotor can be realized, and the heat dissipation and cooling effects on the motor rotor are further improved; in addition, through the matching structure form of the heat conduction ribs and the through grooves, the contact area between the heat conduction ribs and the motor rotor can be enhanced, and the heat dissipation effect is further improved; the air-cooled flow passage is isolated from the speed reducer inside or outside the motor by the sealing structure formed by the end cover and the oil seal, so that foreign objects are prevented from entering the speed reducer inside or outside the motor, and high protection level is ensured.

Drawings

Fig. 1 is a longitudinal sectional view of a conventional servo motor;

FIG. 2 is a longitudinal sectional view of a servo motor of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional structural view of the inventive shaft, heat-conducting inner tube and motor rotor combination;

FIG. 5 is a cross-sectional view B-B of FIG. 4;

FIG. 6a is a perspective view of the thermally conductive inner tube of the present invention;

FIG. 6b is a front view of the thermally conductive inner tube of FIG. 6 a;

FIG. 6C is a cross-sectional view C-C of FIG. 6 b;

FIG. 7a is a perspective view of the spindle of the present invention;

FIG. 7b is an isometric view of FIG. 7 a;

FIG. 7c is a cross-sectional view D-D of FIG. 7 b;

fig. 8 is a perspective view of an air discharge end cap in the motor heat dissipation assembly of the present invention;

fig. 9 is a perspective view illustrating a centrifugal impeller in the heat dissipation assembly of the motor according to the present invention;

fig. 10 is a schematic view of the flow structure of the cooling heat dissipation air flow of the motor of the present invention.

The reference numbers are given as:

1. a rotating shaft; 100. a hollow flow passage; 101. a gas inlet; 102. a gas outlet; 2. a housing; 3. a first end cap; 4. a second end cap; 5. rotating the impeller; 6. an air exhaust end cover; 7. an exhaust chamber; 8. an exhaust hole; 9. a heat conducting inner tube; 91. an inner tube body; 92. a heat conducting rib; 93. a heat sink; 10. a motor rotor; 104. a permanent magnet; 11. a second hollow flow channel; 12. a through groove; 13. a motor stator; 14. a brake rotor; 15. a brake stator; 16. an encoder; 17. an encoder cover; 18. an encoder space; 19. a first seal structure; 20. a second seal structure; 21. a third seal structure; 22. a first bearing; 23. a second bearing.

Detailed Description

The structure of a conventional servo motor is as shown in fig. 1, the motor can generate heat during operation, wherein the heat dissipation of a motor stator, a brake stator, a front bearing and a rear bearing is mainly conducted through a shell and an end cover, so that heat exchange is carried out with external air to dissipate heat. In order to achieve high protection level, the motor rotor (permanent magnet), the encoder, the brake rotor and the rotating shaft are isolated inside the motor, and heat can be conducted only through the bearing and air inside the motor, so that heat cannot be effectively dissipated, and finally, the temperature rise of the motor can be reduced only by reducing the power of the motor, and therefore reliable operation is achieved. The oil seal-1 of the front end cover of the motor is mainly used for isolating the inside of the motor from an external speed reducer and preventing foreign matters from entering the motor or the speed reducer.

As shown in fig. 2 to 10, the present invention provides a heat dissipating assembly for a motor, which includes:

the gas exhaust device comprises a rotating shaft 1, a casing 2, a first end cover 3 and a second end cover 4, wherein a hollow flow channel 100 is arranged inside the rotating shaft 1, a gas inlet 101 and a gas outlet 102 are further arranged on the rotating shaft 1, the gas inlet 101 is communicated with one end of the hollow flow channel 100 to enable the hollow flow channel 100 to be filled with gas, the gas outlet 102 is communicated with the other end of the hollow flow channel 100 to enable the gas in the hollow flow channel 100 to be exhausted, the gas inlet 101 is arranged on one side, far away from the second end cover 4, of the first end cover 3 to enable the gas to be filled from the outside of the first end cover 3, and the gas outlet 102 is arranged on one side, far away from the first end cover 3, of the second end cover 4 to exhaust gas towards the outside of the second end cover 4.

According to the invention, the hollow flow channel is arranged in the motor rotating shaft, the gas inlet at one end of the hollow flow channel is positioned at one side of the first end cover, which is far away from the second end cover, and the gas outlet at the other end of the hollow flow channel is positioned at one side of the second end cover, which is far away from the first end cover.

The invention is characterized in that: through having designed special hole runner and heat conduction inner tube structure at the motor shaft to adopt and install centrifugal impeller in the pivot, at the motor during operation, the impeller is rotatory under the pivot drives, inhales outside cold air in the runner of pivot, dispels the heat to encoder, rear bearing, stopper, rotor, front bearing respectively, and the hot-air is discharged from the end cover of airing exhaust, realizes the heat dissipation of motor rotor part. Meanwhile, the heat conduction inner tube structure designed in the inner hole flow passage improves the heat conduction and convection heat dissipation effects of the heating component and the cold air. In addition, through the seal structure that end cover and oil blanket formed, keep apart the inside and external reduction gear of air-cooled runner and motor, avoid the foreign object to get into the inside or external reduction gear of motor, guaranteed high protection level.

The following technical problems are solved:

1. effectively reduce servo motor temperature rise, improve servo motor power.

2. The high-protection-level requirement is met, the efficient heat dissipation of the rotor in the motor can be realized, the permanent magnet is prevented from demagnetizing due to high temperature, and the reliable operation of the servo motor is facilitated.

3. The problem of the radiating effect is not good because pivot material thermal conductivity is poor and hole runner heat radiating area is little leads to is solved, the radiating effect has been improved.

The beneficial effects are as follows:

the structure of forced air exhaust of the rotating shaft inner hole flow channel and the centrifugal impeller is adopted, so that the temperature rise of the motor is effectively reduced; sealing structures such as oil seals are adopted to isolate the air cooling flow channel from the inside of the motor and the external speed reducer, so that foreign objects are prevented from entering the inside of the motor or the external speed reducer, and high protection level is guaranteed; and a special rotating shaft inner hole flow passage and a heat conduction inner pipe structure are adopted, so that the heat dissipation effect is effectively improved.

Compared with the traditional servo motor structure, the motor parts all obtain good cooling effect, wherein the motor rotor, the encoder and the bearing obtain direct heat dissipation effect, and the actual measurement cooling is 30%; and the temperature reduction of the motor stator and the brake is actually measured by 10 percent due to the temperature reduction of the rotor component.

The structure of the motor of the invention is shown in fig. 2, and compared with the conventional servo motor, the motor has the following remarkable differences:

1. the rotating shaft is provided with an inner hole flow passage (a hollow flow passage 100) and a vent hole (a gas outlet 102);

2. a heat conduction inner pipe 9 structure is designed in the rotating shaft inner hole flow passage;

3. a new centrifugal impeller is arranged on the rotating shaft and is driven by the rotating shaft to rotate;

4. the rotating shaft penetrates out of the motor from the encoder rear cover, and a third sealing structure 21 (preferably an oil seal) is arranged between the encoder cover and the rotating shaft to be used as a seal;

5. the new exhaust end cover 6 and the front end cover (second end cover 4) form an exhaust chamber 7, the centrifugal impeller rotates in the exhaust chamber 7 to work, and a first sealing structure 19 (preferably oil seal) and a second sealing structure 20 (preferably oil seal) are arranged on the exhaust end cover and the front end cover as sealing.

Next, the process of ventilation in the air chamber is analyzed, as shown in fig. 3, a plurality of exhaust holes are arranged on the outer circumference of the exhaust end cover, when the centrifugal impeller rotates, the blades drive the air in the air chamber to be discharged out of the exhaust holes, so that the air pressure in the air chamber is reduced, and negative pressure is formed, and due to the sealing effect of the first sealing structure 19 and the second sealing structure 20, the air in the inner hole flow channel of the rotating shaft flows into the air chamber through the vent holes, thereby realizing ventilation of the air chamber.

In some embodiments, the exhaust device further includes a rotary impeller 5 and an exhaust end cap 6, the rotary impeller 5 is sleeved on the rotating shaft 1 and can integrally rotate along with the rotating shaft 1, the rotary impeller 5 is disposed on one side of the second end cap 4 far away from the first end cap 3, the exhaust end cap 6 is disposed on the periphery of the rotating shaft 1 and connected with the second end cap 4, an exhaust chamber 7 is formed inside the exhaust end cap 6, the rotary impeller 5 is disposed in the exhaust chamber 7, and the gas outlet 102 is communicated with the exhaust chamber 7. The air exhaust device is a preferred structure of the invention, the rotating impeller is sleeved on the rotating shaft and can drive the impeller to rotate through the rotation of the rotating shaft, and then the air flow is driven to enter the air exhaust cavity from the air inlet through the hollow flow passage and the air outlet, so that the air flow can dissipate and cool the components such as the motor rotor, the motor stator and the like when passing through the hollow flow passage.

In some embodiments, the rotary impeller 5 is a centrifugal impeller, and the exhaust end cover 6 has an exhaust hole 8 formed therethrough on a circumferential wall thereof opposite to a radially outer side of the rotary impeller 5, the exhaust hole 8 communicating with the exhaust chamber 7; a first sealing structure 19 is arranged between the second end cover 4 and the rotating shaft 1, and a second sealing structure 20 is arranged between the exhaust end cover 6 and the rotating shaft 1. The rotary impeller is preferably a centrifugal impeller, can suck gas from the axial direction and exhaust the gas from the radial outer side to the exhaust hole of the exhaust end cover so as to exhaust the gas to the outside, achieves the effect that the gas flow enters the hollow flow channel from one end of the rotating shaft to dissipate heat of a motor rotor and the like and is exhausted from the other end, ensures that the gas flow does not enter the inner space of the motor, improves the sealing performance and ensures the high protection level of the motor.

One side of the air exhaust end cover is assembled with the front end cover to form an air chamber, and a plurality of air exhaust holes are arranged on the outer circumference of the side; and the other side is a spigot end face for mounting the motor and the speed reducer, and a structure for mounting a second sealing structure 20 is designed to provide sealing for forming an air chamber and prevent foreign matters from entering the speed reducer. As shown in fig. 5.

The centrifugal impeller of the present invention is structured as shown in fig. 6, and when the impeller rotates, the centrifugal impeller works on the air between the blades, and the air is thrown from the center of the impeller to the periphery under the centrifugal action.

In some embodiments, one axial end of the rotating shaft 1 penetrates through the first end cap 3, the gas inlet 101 is disposed at one axial end of the rotating shaft 1, the hollow flow channel 100 extends to the one axial end of the rotating shaft 1 and is communicated with the gas inlet 101, the other axial end of the rotating shaft 1 penetrates through the exhaust end cap 6, one end of the gas outlet 102 is communicated with the hollow flow channel 100, the other end of the gas outlet is communicated with the exhaust chamber 7, the gas outlet 102 is a straight channel, and an included angle larger than 0 is formed between a central axis of the straight channel and a central axis of the rotating shaft 1. The rotating shaft, the first end cover, the second end cover and the exhaust end cover are further preferred in structural form, namely, one end of the rotating shaft penetrates through the first end cover, the other end of the rotating shaft penetrates through the second end cover and the exhaust end cover, the gas outlet obliquely discharges gas in the hollow flow channel into the exhaust cavity, effective sealing effect between the gas and the inner cavity of the shell is achieved, and protection grade is improved.

In some embodiments, the gas outlets 102 are multiple and are sequentially spaced along the circumferential direction of the rotating shaft 1. The air outlets are preferably multiple and arranged at intervals along the circumferential direction of the rotating shaft, so that the air outlet area in the circumferential direction can be increased, and the air outlet effect is improved.

In some embodiments, the motor further includes a heat conduction inner tube 9, the heat conduction inner tube 9 is disposed in the hollow flow channel 100 and at least faces the motor rotor 10, a second hollow flow channel 11 is disposed inside the heat conduction inner tube 9, the second hollow flow channel 11 penetrates from one axial end of the heat conduction inner tube 9 to the other axial end, the second hollow flow channel 11 is communicated with the hollow flow channel 100, and the heat conduction inner tube 9 can achieve contact type heat conduction for the motor rotor 10.

The heat conduction inner pipe is arranged in the hollow flow channel of the rotating shaft and opposite to the motor rotor, so that gas can be conducted through the hollow flow channel II in the heat conduction inner pipe, the heat conduction effect on the motor rotor can be realized, and the heat dissipation and cooling effects on the motor rotor are further improved; and through the cooperation structural style of a plurality of heat conduction muscle and through-groove, can strengthen the area of contact between with electric motor rotor through the heat conduction muscle, further improve the radiating effect.

The inner hole of the rotating shaft is provided with a heat conduction inner pipe structure which is used for improving the heat dissipation performance of the conduction and convection of cold air flowing in a heating component (mainly a motor rotor) and the inner hole.

In some embodiments, the heat conducting inner tube 9 includes an inner tube main body 91 and a heat conducting rib 92, the inner tube main body 91 is a cylindrical structure, one end of the heat conducting rib 92 is disposed on an outer wall of the inner tube main body 91, and the other end protrudes outward, a through groove 12 is disposed at a position of the rotating shaft 1 opposite to the inner tube main body 91, the through groove 12 penetrates through the inner wall to the outer wall of the rotating shaft 1, and the heat conducting rib 92 penetrates through the through groove 12 and can contact with the motor rotor 10. The heat conduction inner pipe is a preferable structure form of the heat conduction inner pipe, the inner pipe main body is arranged in the hollow flow passage and is flush with the inner peripheral wall of the hollow flow passage through the structure comprising the inner pipe main body and the heat conduction ribs, the heat conduction ribs protrude outwards from the outer wall of the inner pipe main body and are matched with the through grooves formed in the rotating shaft, the heat conduction ribs extend out to be in contact with the motor rotor, the heat conduction and heat exchange effect between the heat conduction ribs and the motor rotor is effectively realized, and the heat exchange efficiency of the motor rotor is enhanced.

In some embodiments, the number of the heat conducting ribs 92 is multiple, the multiple heat conducting ribs 92 are sequentially arranged at intervals in the circumferential direction of the outer wall of the inner pipe main body 91, the multiple through grooves 12 are also multiple, the multiple through grooves 12 are sequentially arranged at intervals in the circumferential direction of the rotating shaft 1, and the heat conducting ribs 92 and the through grooves 12 are arranged in a one-to-one matching manner. The motor rotor heat dissipation structure is provided with a plurality of heat conduction ribs and a plurality of through grooves, so that the contact area between the motor rotor and the motor rotor in the circumferential direction can be increased, and the heat dissipation and exchange effect of the motor rotor is improved.

In some embodiments, the inner wall of the heat conducting inner tube 9 is provided with a groove, forming a heat dissipation groove 93; and/or the heat conduction inner pipe 9 is made of copper alloy. The heat-conducting inner tube is provided with the heat-radiating grooves, so that the heat-exchanging area of the gas and the heat-conducting inner tube can be increased when the gas passes through the heat-conducting inner tube, the gas in the hollow flow channel and the heat-conducting inner tube are further improved, and the heat-exchanging and heat-radiating effect on the motor rotor is further improved; the heat conduction inner pipe is preferably made of copper alloy, so that the heat exchange efficiency of the heat conduction inner pipe can be further improved.

The conventional rotating shaft usually adopts carbon steel or stainless steel, and the heat conductivity coefficient is only 40-60W/(m.K), while the invention adopts carbon steel as the main body structure of the rotating shaft, under the condition of satisfying the structural strength, the rotating shaft is embedded with the heat conduction inner pipe, as shown in fig. 4 and 5, the outer circle of the heat conduction inner pipe is provided with a tooth-shaped heat conduction rib structure, the tooth top is directly contacted with the inner surface of the motor rotor core, and the heat of the motor rotor core can be directly conducted through the heat conduction inner pipe. The heat conduction inner tube is made of copper alloy or other materials with higher heat conductivity coefficient, the heat conductivity coefficient of the copper alloy is 390W/(m.K), and the heat conductivity is improved.

In addition, the conventional inner hole flow passage is a circular hole, and the inner diameter of the conventional inner hole flow passage is smaller, so that the area of convective heat transfer is smaller, and a radial heat dissipation concave-convex groove-shaped structure is added in the heat conduction inner pipe designed by the invention, as shown in fig. 6a-6c, the actual convective heat transfer area of the structure of the invention is improved by 30 percent compared with the conventional circular hole, and the convective heat transfer quantity is also improved due to the improvement of the contact area. In addition, the conventional heat radiating grooves of the servo motor are axially arranged, but resistance is generated due to the rotation of the rotor, and the groove-shaped structure of the invention is radially distributed, so that the heat radiating area can be increased, and the efficiency of the motor cannot be adversely affected.

The rotating shaft of the invention is composed of a steel pipe part and a heat conduction inner pipe embedded in the steel pipe part, wherein the steel pipe part is provided with an inner hole flow channel, a groove matched with the heat conduction inner pipe and a vent hole structure uniformly distributed in the radial direction of the rotating shaft, as shown in figure 4. For smooth air flow, the included angle between the air vent and the axis of the rotating shaft is obtuse, and considering the processability, the included angle is 135 +/-35 degrees.

The invention further provides a motor, which comprises the motor heat dissipation assembly, a motor rotor 10 and a motor stator 13, wherein the motor rotor 10 is sleeved on the periphery of the rotating shaft 1, the motor stator 13 is positioned on the periphery of the motor rotor 10, and the motor rotor 10 and the motor stator 13 are arranged in a space surrounded by the casing 2, the first end cover 3 and the second end cover 4.

According to the invention, gas can be introduced from the outside of the motor rotor and the stator through the hollow flow channel arranged in the rotating shaft, and is led out through the gas outlet after heat dissipation is carried out on structures such as the motor rotor and the like in the hollow flow channel, so that the gas does not enter the interior of the motor shell, the sealing performance of the interior of the motor can be ensured while the heat dissipation and cooling effects of the interior of the motor are improved, the high protection level of the motor is ensured, and the problems that the permanent magnet is easy to demagnetize and the reliability of the servo motor is influenced due to poor heat dissipation performance of the rotor structure are solved.

In some embodiments, the motor further comprises a brake rotor 14 and a brake stator 15, the brake rotor 14 and the brake stator 15 are disposed between the first end cover 3 and the motor stator 13, the motor further comprises an encoder 16 and an encoder cover 17, the encoder cover 17 is connected to a side of the first end cover 3 away from the second end cover 4, the encoder cover 17 is disposed on the periphery of the rotating shaft 1, an encoder space 18 is formed inside the encoder cover 17, and the encoder 16 is disposed on the periphery of the rotating shaft and located in the encoder space 18. The hollow flow passage in the rotating shaft can further dissipate heat and cool the encoder, the brake and the like, and further improve the heat dissipation effect on the internal structure of the motor.

To sum up, when the motor of the present invention works, the rotor rotates, the rotating shaft drives the centrifugal impeller to rotate, according to the analysis of the ventilation process in the air chamber, the air in the inner hole flow passage of the rotating shaft flows into the air chamber through the vent hole, resulting in a decrease in the pressure in the inner hole flow passage, and the pressure of the external air is higher than that of the inner hole flow passage, so that the external air enters the inner hole flow passage from the inlet at the tail of the rotating shaft (behind the encoder cover), and finally, a ventilation and heat dissipation process is formed, in which the air enters from the inlet at the tail of the rotating shaft and is exhausted from the exhaust hole of the exhaust end cover, as shown in fig. 10. In the ventilation and heat dissipation process, cold air flows in an inner hole flow channel of the rotating shaft, sequentially passes through the encoder, the rear bearing inner ring, the brake rotor, the motor rotor and the front bearing inner ring, and is finally exhausted out of the motor through the air chamber.

Because of the size limitation of the servo motor, the invention mainly aims at optimizing the heat dissipation of the motor rotor to make a heat conduction inner pipe structure, and under the condition that the size of a rotating shaft of some large motors allows, the heat conduction inner pipe can be arranged in an inner hole flow channel of the whole section of the rotating shaft, so that the heat dissipation effect is better. And should be within the scope of the present invention.

The impeller blade form of the invention is not limited to a straight blade, and can be other involute type blades, the wind pressing efficiency can be increased in the working direction, but the efficiency is lower in the reverse direction, so that the impeller blade form is only suitable for a motor running in a single direction.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (11)

1. The utility model provides a motor cooling module which characterized in that: the method comprises the following steps:

the air exhaust device comprises a rotating shaft (1), a casing (2), a first end cover (3) and a second end cover (4), wherein a hollow flow channel (100) is arranged inside the rotating shaft (1), a gas inlet (101) and a gas outlet (102) are further arranged on the rotating shaft (1), the gas inlet (101) is communicated with one end of the hollow flow channel (100) to enable the hollow flow channel (100) to be air-inlet, the gas outlet (102) is communicated with the other end of the hollow flow channel (100) to enable gas in the hollow flow channel (100) to be exhausted, the gas inlet (101) is arranged on one side, far away from the second end cover (4), of the first end cover (3) to enable the gas to be air-inlet from the outside of the first end cover (3), and the gas outlet (102) is arranged on one side, far away from the first end cover (3), of the second end cover (4) to enable the gas to be exhausted towards the outside of the second end cover (4).

2. The motor heat sink assembly of claim 1, wherein:

still include rotary impeller (5) and exhaust end cover (6), rotary impeller (5) cover is located just can be along with on pivot (1) the integrative rotation of pivot (1), just rotary impeller (5) set up in keeping away from of second end cover (4) one side of first end cover (3), just exhaust end cover (6) set up in the periphery of pivot (1) and with second end cover (4) meet the inside of exhaust end cover (6) forms air exhaust chamber (7), rotary impeller (5) set up in air exhaust chamber (7), gas outlet (102) with air exhaust chamber (7) intercommunication.

3. The motor heat dissipation assembly of claim 2, wherein:

the rotary impeller (5) is a centrifugal impeller, exhaust holes (8) are formed in the circumferential wall of the exhaust end cover (6) opposite to the radial outer side of the rotary impeller (5) in a penetrating mode, and the exhaust holes (8) are communicated with the exhaust chamber (7); a first sealing structure (19) is arranged between the second end cover (4) and the rotating shaft (1), and a second sealing structure (20) is arranged between the exhaust end cover (6) and the rotating shaft (1).

4. The motor heat sink assembly of claim 2, wherein:

the axial one end of pivot (1) is worn out first end cover (3), just gas inlet (101) set up in the axial one end of pivot (1), cavity runner (100) extend to the axial one end of pivot (1) and with gas inlet (101) intercommunication, the axial other end of pivot (1) is worn out exhaust end cover (6), the one end of gas outlet (102) with cavity runner (100) intercommunication, the other end with air exhaust cavity (7) intercommunication, just gas outlet (102) are straight passageway, its central axis with press from both sides between the central axis of pivot (1) and establish the contained angle that is greater than 0.

5. The motor heat sink assembly of claim 4, wherein:

the gas outlets (102) are arranged in the circumferential direction of the rotating shaft (1) at intervals in sequence.

6. The motor heat sink assembly of any one of claims 1-5, wherein:

still include heat conduction inner tube (9), heat conduction inner tube (9) set up in cavity runner (100) and relative with electric motor rotor (10) at least, the inside of heat conduction inner tube (9) has cavity runner two (11), cavity runner two (11) are followed the axial one end of heat conduction inner tube (9) is run through to the axial other end, just cavity runner two (11) with cavity runner (100) intercommunication, heat conduction inner tube (9) can be right electric motor rotor (10) realizes the contact heat conduction.

7. The motor heat dissipation assembly of claim 6, wherein:

the heat conduction inner tube (9) comprises an inner tube main body (91) and heat conduction ribs (92), the inner tube main body (91) is of a cylindrical structure, one end of each heat conduction rib (92) is arranged on the outer wall of the inner tube main body (91) and the other end of each heat conduction rib protrudes outwards, a through groove (12) is formed in the position, opposite to the inner tube main body (91), of the rotating shaft (1), the through groove (12) penetrates through the inner wall to the outer wall of the rotating shaft (1), and the heat conduction ribs (92) penetrate through the through groove (12) and can be in contact with the motor rotor (10).

8. The motor heat sink assembly of claim 7, wherein:

the heat conduction muscle (92) are a plurality of, and are a plurality of heat conduction muscle (92) are in the circumference direction of the outer wall of inner tube main part (91) interval sets gradually, it is also a plurality of to link up groove (12), and is a plurality of link up groove (12) along the circumference direction of pivot (1) interval sets gradually, just heat conduction muscle (92) with link up groove (12) cooperation one by one sets up.

9. The motor heat sink assembly of any one of claims 6-8, wherein:

the inner wall of the heat conduction inner pipe (9) is provided with a groove to form a heat dissipation groove (93); and/or the heat conduction inner pipe (9) is made of copper alloy.

10. An electric machine characterized by: the motor heat dissipation assembly of any one of claims 1 to 9, further comprising a motor rotor (10) and a motor stator (13), wherein the motor rotor (10) is sleeved on the outer periphery of the rotating shaft (1), the motor stator (13) is located on the outer periphery of the motor rotor (10), and the motor rotor (10) and the motor stator (13) are disposed in a space surrounded by the casing (2), the first end cover (3) and the second end cover (4).

11. The electric machine of claim 10, wherein:

the motor further comprises an encoder (16) and an encoder cover (17), the encoder cover (17) is connected to one side, far away from the second end cover (4), of the first end cover (3), the encoder cover (17) is arranged on the periphery of the rotating shaft (1), an encoder space (18) is formed inside the encoder cover (17), and the encoder (16) is arranged on the periphery of the rotating shaft and located in the encoder space (18).

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