CN217183127U

CN217183127U - Heat radiator for external rotor electric machine

Info

Publication number: CN217183127U
Application number: CN202220246068.8U
Authority: CN
Inventors: 王振东
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-29
Filing date: 2022-01-29
Publication date: 2022-08-12
Anticipated expiration: 2032-01-29

Abstract

The utility model provides an external rotor electric machine's heat abstractor belongs to motor technical field. It has solved the poor problem of outer rotor motor radiating effect in the prior art. The heat dissipation device of the outer rotor motor comprises a fixing frame, wherein an inner stator is fixedly arranged on the fixing frame, an outer rotor shell with an open end is sleeved outside the inner stator, a permanent magnet is fixedly arranged on the outer rotor shell and positioned between the outer rotor shell and the inner stator, a rotating shaft is rotatably connected to the middle of the fixing frame and fixedly connected with the outer rotor shell, a fixing rod penetrating out of the outer rotor shell is arranged on the rotating shaft, a fan is arranged on the fixing rod, a plurality of ventilation holes are formed in the position, corresponding to fan blades, of the outer rotor shell, a wind guide wall is arranged on one side of the outer edge of each ventilation hole, and the wind guide wall is obliquely arranged towards the inclined direction of the fan blades. The utility model has the advantages of can improve external rotor electric machine's heat-sinking capability.

Description

Heat radiator for external rotor electric machine

Technical Field

The utility model belongs to the technical field of the motor, a heat abstractor of external rotor electric machine is related to.

Background

At present, the motor mainly comprises a rotor and a stator, which are used for realizing conversion between electric energy and mechanical energy and between mechanical energy and electric energy, and are core driving sources of products such as sprayers, cleaning machines and compressors generally, for various external rotor motors, the rotor of the motor is formed by laminating silicon steel sheets generally, the stator of the motor generally comprises an iron core and a winding coil, loss can be generated in the running process of the motor, the loss mainly comprises copper loss of the stator winding and loss (namely iron loss) of the stator and the iron core of the rotor, the copper loss and the iron loss can be expressed in a heating mode, and therefore the efficiency of the motor is influenced, and even permanent magnets can be demagnetized due to overhigh temperature rise of the rotor in serious cases.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided an external rotor electric machine's heat abstractor. The utility model provides a technical problem how improve external rotor electric machine's heat-sinking capability.

The purpose of the utility model can be realized by the following technical proposal:

the heat dissipation device of the outer rotor motor comprises a fixing frame and is characterized in that an inner stator is fixedly arranged on the fixing frame, an outer rotor shell with an open end is sleeved outside the inner stator, a permanent magnet is fixedly arranged on the outer rotor shell and positioned between the outer rotor shell and the inner stator, a rotating shaft is rotatably connected to the middle of the fixing frame and fixedly connected with the outer rotor shell, a fixing rod penetrating out of the outer rotor shell is arranged on the rotating shaft, a fan is arranged on the fixing rod, a plurality of ventilation holes are formed in the position, corresponding to fan blades, of the outer rotor shell, a wind guide wall is arranged on one side of the outer edge of each ventilation hole, and the wind guide wall is obliquely arranged towards the inclination direction of the fan blades.

This external rotor electric machine's heat abstractor's external rotor casing's the coaxial fan that is provided with in the outside to the position that corresponds fan blade at external rotor casing is provided with a plurality of ventilation hole, the outside along one side in ventilation hole is provided with the wind-guiding wall, and the wind-guiding wall sets up towards the incline direction slope of fan blade, and the wind-guiding wall of above-mentioned structure can guide the air current better and get into in the external rotor casing through the ventilation hole, and continuously take away inside heat from the opening outflow of external rotor casing, thereby can improve the inside radiating effect of this external rotor electric machine, and then improve the performance of motor, and simultaneously, the fan passes through the dead lever setting in the pivot, can follow the pivot synchronous rotation, thereby improve the radiating efficiency.

In addition, compared with an inner rotor motor, the outer rotor motor effectively improves the power and the efficiency of the motor under the same appearance and weight, and parameters such as the power, the torque and the like of the motor can be changed by adjusting the thickness and the diameter of the rotor part and the stator part, thereby being beneficial to the miniaturization and the light weight of the motor.

In the above heat dissipation apparatus for an external rotor motor, the middle portion of the external rotor housing is provided with a positioning hole through which the fixing rod is inserted, the fixing rod has an external thread, the end portion of the rotating shaft is axially provided with a connecting hole, an internal thread matched with the external thread of the fixing rod is arranged in the connecting hole, and the edge of the connecting hole is fixedly connected with the inner side edge of the positioning hole. Above-mentioned structure can fix fan and outer rotor housing better to make fan and outer rotor housing better and pivot synchronous revolution, also make things convenient for the dismouting of dead lever simultaneously.

In the heat dissipation device of the outer rotor motor, the plurality of vent holes are located beside the positioning hole and are uniformly distributed along the circumferential direction. The structure enables the wind guide wall to better guide wind flow to enter the outer rotor shell through the vent holes.

In the heat dissipation device for the outer rotor motor, the bracket of the fan is in threaded connection with the fixing rod, and the fixing rods are respectively provided with the positioning nuts at two sides of the fan bracket. The structure facilitates the disassembly and assembly of the fan, and the fan is firmly arranged on the fixing rod by the two positioning nuts, so that the displacement phenomenon cannot occur.

In the above heat dissipation device for an external rotor motor, the fixing frame includes a disk body, a shaft hole for setting the rotating shaft is provided at the axis of the disk body, an annular convex ring is convexly provided along the axial direction at the edge of the shaft hole, a gap is provided between the opened ends of the disk body and the external rotor housing, the internal stator is fixedly arranged on the outer wall of the annular convex ring, one end of the rotating shaft is rotatably arranged in the annular convex ring through a first bearing and penetrates out of the shaft hole, and the other end of the rotating shaft is rotatably arranged on a support of the internal stator through a second bearing. Above-mentioned structure makes this external rotor electric machine's compact structure, also makes things convenient for this external rotor electric machine's dismouting and maintenance, simultaneously, has the clearance between disk body and the end of opening of external rotor casing for the wind current can flow from the clearance and constantly take away inside heat, thereby can improve this internal radiating effect of external rotor electric machine, and then improves the performance of motor.

In the heat dissipation device of the outer rotor motor, one side of the disk body facing the outer rotor shell is provided with a plurality of heat dissipation ribs, and the edge of the disk body is provided with a plurality of fixing parts along the circumferential direction. The heat dissipation effect of the outer rotor motor can be improved by the plurality of heat dissipation ribs, and the outer rotor motor is convenient to disassemble and assemble by the plurality of fixing parts.

Compared with the prior art, the heat dissipation device of the outer rotor motor has the advantages that: this external rotor electric machine's heat abstractor's external rotor casing's the coaxial fan that is provided with in the outside to the position that corresponds fan blade at external rotor casing is provided with a plurality of ventilation hole, the outside along one side in ventilation hole is provided with the wind-guiding wall, and the wind-guiding wall sets up towards the incline direction slope of fan blade, and the wind-guiding wall of above-mentioned structure can guide the air current better and get into in the external rotor casing through the ventilation hole, and continuously take away inside heat from the opening outflow of external rotor casing, thereby can improve the inside radiating effect of this external rotor electric machine, and then improve the performance of motor, and simultaneously, the fan passes through the dead lever setting in the pivot, can follow the pivot synchronous rotation, thereby improve the radiating efficiency. In addition, compared with an inner rotor motor, the outer rotor motor effectively improves the power and the efficiency of the motor under the same appearance and weight, and parameters such as the power, the torque and the like of the motor can be changed by adjusting the thickness and the diameter of the rotor part and the stator part, thereby being beneficial to the miniaturization and the light weight of the motor.

Drawings

Fig. 1 is a schematic perspective view of the heat dissipation device of the external rotor motor.

Fig. 2 is an exploded view of the heat sink of the present external rotor motor.

Fig. 3 is a sectional view of the heat sink of the external rotor motor.

In the figure, 1, a fixed frame; 101. a tray body; 102. an annular convex ring; 1011. a shaft hole; 2. an inner stator; 3. an outer rotor housing; 4. a permanent magnet; 5. a rotating shaft; 6. fixing the rod; 7. a fan; 8. a vent hole; 9. an air guide wall; 10. positioning holes; 11. connecting holes; 12. positioning a nut; 13. a first bearing; 14. a second bearing; 15. heat dissipation ribs; 16. a fixed part.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

A heat dissipation device of an external rotor motor, referring to fig. 1-3, comprises a fixing frame 1, wherein an internal stator 2 is fixedly arranged on the fixing frame 1, an external rotor shell 3 with an open end is sleeved outside the internal stator 2, a permanent magnet 4 is fixedly arranged on the external rotor shell 3, the permanent magnet 4 is positioned between the external rotor shell 3 and the internal stator 2, the middle part of the fixing frame 1 is rotatably connected with a rotating shaft 5, the rotating shaft 5 is fixedly connected with the external rotor shell 3, a fixing rod 6 penetrating out of the external rotor shell 3 is arranged on the rotating shaft 5, a fan 7 is arranged on the fixing rod 6, a plurality of ventilation holes 8 are formed in the external rotor shell 3 corresponding to fan blades of the fan 7, a wind guide wall 9 is arranged on one side of the outer edge of the ventilation holes 8, and the wind guide wall 9 is obliquely arranged towards the oblique direction of the fan blades of the fan 7. Specifically, a positioning hole 10 through which a fixing rod 6 penetrates is formed in the middle of the outer rotor shell 3, the fixing rod 6 is provided with external threads, a connecting hole 11 is formed in the end portion of the rotating shaft 5 along the axial direction, internal threads matched with the external threads of the fixing rod 6 are formed in the connecting hole 11, and the edge of the connecting hole 11 is fixedly connected with the inner side edge of the positioning hole 10; the plurality of vent holes 8 are positioned at the side of the positioning hole 10 and are uniformly distributed along the circumferential direction; the bracket of the fan 7 is in threaded connection with the fixing rod 6, and the fixing rod 6 is provided with positioning nuts 12 on two sides of the bracket of the fan 7.

Referring to fig. 1, 2 and 3, further, the fixing frame 1 includes a disc body 101, a shaft hole 1011 for installing the rotating shaft 5 is formed at an axis of the disc body 101, an annular convex ring 102 is axially and convexly arranged at an edge of the shaft hole 1011, a gap is formed between the disc body 101 and an open end of the outer rotor housing 3, the inner stator 2 is fixedly arranged on an outer wall of the annular convex ring 102, one end of the rotating shaft 5 is rotatably arranged in the annular convex ring 102 through a bearing one 13 and penetrates through the shaft hole 1011, and the other end of the rotating shaft 5 is rotatably arranged on a bracket of the inner stator 2 through a bearing two 14; one side of the disc body 101 facing the outer rotor shell 3 is provided with a plurality of heat dissipation ribs 15, and the edge of the disc body 101 is provided with a plurality of fixing portions 16 along the circumferential direction.

This external rotor electric machine's heat abstractor's external rotor casing 3's the coaxial fan 7 that is provided with in the outside to be provided with a plurality of ventilation hole 8 in the position that external rotor casing 3 corresponds fan 7 flabellum, the outside along one side of ventilation hole 8 is provided with wind-guiding wall 9, and wind-guiding wall 9 sets up towards the slope direction slope of fan 7 flabellum, and wind-guiding wall 9 of above-mentioned structure can guide the distinguished and admirable through ventilation hole 8 entering external rotor casing 3 in better to from external rotor casing 3's the end of opening outflow constantly take away inside heat, thereby can improve the inside radiating effect of this external rotor electric machine, and then improve the performance of motor, simultaneously, fan 7 passes through dead lever 6 and sets up on pivot 5, can follow pivot 5 synchronous rotation, thereby improve the radiating efficiency. In addition, compared with an inner rotor motor, the outer rotor motor effectively improves the power and the efficiency of the motor under the same appearance and weight, and parameters such as the power, the torque and the like of the motor can be changed by adjusting the thickness and the diameter of the rotor part and the stator part, so that the miniaturization and the light weight of the motor are facilitated.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A heat dissipation device of an outer rotor motor comprises a fixing frame (1) and is characterized in that an inner stator (2) is fixedly arranged on the fixing frame (1), an outer rotor shell (3) with an open end is sleeved outside the inner stator (2), a permanent magnet (4) is fixedly arranged on the outer rotor shell (3), the permanent magnet (4) is located between the outer rotor shell (3) and the inner stator (2), a rotating shaft (5) is rotatably connected to the middle of the fixing frame (1), the rotating shaft (5) is fixedly connected with the outer rotor shell (3), a fixing rod (6) penetrating out of the outer rotor shell (3) is arranged on the rotating shaft (5), a fan (7) is arranged on the fixing rod (6), a plurality of ventilation holes (8) are formed in the position, corresponding to fan blades of the fan (7), of the outer rotor shell (3), and a wind guide wall (9) is arranged on one side of the outer edge of each ventilation hole (8), the air guide wall (9) is arranged obliquely towards the inclination direction of the fan blades of the fan (7).

2. The heat dissipation device for the external rotor motor according to claim 1, wherein a positioning hole (10) through which the fixing rod (6) is inserted is formed in the middle of the external rotor housing (3), the fixing rod (6) has an external thread, a connecting hole (11) is axially formed in the end of the rotating shaft (5), an internal thread matched with the external thread of the fixing rod (6) is formed in the connecting hole (11), and an edge of the connecting hole (11) is fixedly connected with an inner side edge of the positioning hole (10).

3. The heat dissipation device for an external rotor motor as claimed in claim 2, wherein a plurality of ventilation holes (8) are located beside the positioning hole (10) and are uniformly distributed along the circumferential direction.

4. The heat dissipation device for an external rotor motor as recited in claim 2, wherein the bracket of the fan (7) is screwed on the fixing rod (6), and the fixing rod (6) is provided with a positioning nut (12) at each side of the bracket of the fan (7).

5. The heat dissipation device of the external rotor motor as claimed in claim 1, 2, 3 or 4, wherein the fixing frame (1) includes a disc body (101), an axial hole (1011) for installing the rotating shaft (5) is opened at the axial center of the disc body (101), an annular convex ring (102) is axially and convexly arranged at the edge of the axial hole (1011), a gap is formed between the disc body (101) and the end of the external rotor housing (3), the internal stator (2) is fixedly arranged on the outer wall of the annular convex ring (102), one end of the rotating shaft (5) is rotatably arranged in the annular convex ring (102) through a first bearing (13) and penetrates through the axial hole (1011), and the other end of the rotating shaft (5) is rotatably arranged on the bracket of the internal stator (2) through a second bearing (14).

6. The heat dissipation device for an external rotor motor as recited in claim 5, wherein a side of the disk body (101) facing the external rotor housing (3) is provided with a plurality of heat dissipation ribs (15), and a plurality of fixing portions (16) are circumferentially provided at an edge of the disk body (101).