REEL MOTOR WITH CLOSED COOLING CIRCUIT

Abstract

A reel motor (1) for a driven conveyor roller has a stator (11) that is surrounded by a stator housing (10). A rotor (12) drives a rotor shaft (13). A tubular external housing (30) runs around the stator housing (10) at a distance in the circumferential direction. A cooling duct (20) is fluidically connected to an interior of the stator housing (10) holding the stator (11). The cooling duct 20 is formed between the external housing (30) and the stator housing (10). An impeller wheel (14) is secured to the rotor shaft (13). The impeller wheel generates a cooling air flow (K). The interior of the stator housing (10) and the cooling duct (20) determine a closed cooling circuit. The cooling air flow is guided through the closed cooling circuit.

Claims

1.-15. (canceled)

16. A reel motor for a driven conveyor roller comprising: a stator surrounded by a stator housing and a rotor driving a rotor shaft; a tubular external housing runs around the stator housing at a distance in the circumferential direction; a cooling duct, is fluidically connected to an interior of the stator housing holding the stator, the cooling duct is formed between the external housing and the stator housing; and an impeller wheel is secured to the rotor shaft, the impeller wheel generates a cooling air flow, the interior of the stator housing and the cooling duct determine a closed cooling circuit through which the cooling air flow is guided.

17. The reel motor according to claim 16, wherein the stator housing, along its axial longitudinal direction, has two external sections and, lying axially in between, a directly adjoining middle section, the stator and the rotor are arranged in the middle section, and, in the external sections of the stator housing, respective openings leading to the cooling duct are provided for the fluidic connection.

18. The reel motor according to claim 17, wherein the openings extend in the radial direction.

19. The reel motor according to claim 17, wherein the impeller wheel is provided on the rotor shaft in an area facing the openings and is designed to conveys air through the openings from the stator housing into the cooling duct or from the cooling duct into the stator housing.

20. The reel motor according to claim 16, wherein the external housing is sealed off with respect to the environment by at least one sealing element.

21. The reel motor according to claim 16, wherein the stator housing is secured on an axle extending axially out of the external housing and arranged concentrically with respect to the rotor shaft, and the external housing is rotatably mounted with respect to the axle.

22. The reel motor according to claim 16, wherein the external housing is connected to the rotor shaft.

23. The reel motor according to claim 22, further comprising a gearbox, the external housing is connected via the gearbox to the rotor shaft.

24. The reel motor according to claim 23, wherein, when viewed in the axial direction, the impeller wheel is arranged between the stator and the gearbox.

25. The reel motor according to claim 16, wherein the stator comprises stator windings that are arranged in the interior of the stator housing, so that the cooling air flow runs through along the stator windings and/or between the stator windings.

26. The reel motor according to claim 16, wherein the rotor shaft is mounted in the stator housing rotatably with respect to the stator housing via a bearing plate and a bearing accommodated in the bearing plate, and the bearing plate has flow passages which determine a portion of the closed cooling circuit.

27. The reel motor according to claim 26 wherein the flow passages of the bearing plate are oriented facing the stator and/or designed in the form of nozzles.

28. The reel motor according to claim 16, wherein the external housing has cooling ribs on its internal wall side facing the stator housing or the stator housing has cooling ribs on its external wall side facing the external housing.

29. The reel motor according to claim 16, wherein the external housing has guide elements guiding the cooling air flow on its internal wall side facing the stator housing or the stator housing has guide elements on its external wall side facing the external housing.

30. A conveyor roller with a reel motor according to claim 16, with a cylindrical roller body, wherein the roller body is formed by the external housing of the reel motor.

Description

DRAWINGS

[0037] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0038] Other advantageous developments of the disclosure are characterized in the dependent claims or represented below in further detail together with the description of the preferred embodiment of the disclosure in reference to the FIGURE. In the FIGURE:

[0039] FIG. 1 is cross section view of a sealed reel motor with a closed cooling circuit.

[0040] The embodiment example of the reel motor 1 shown in FIG. 1 includes an axle 21 extending into the external housing 30. The external housing 30 at the same time forms the roller body of the conveyor roller. The axle 21 is oriented concentrically with respect to a longitudinal axis L of the reel motor 1, which is at the same time a rotation axis around which the external housing 30 and the rotor shaft 13 are rotatably mounted. The axle 21, on its side protruding from the external housing 30, can be secured on a frame, not represented, of a conveyor device. The stator housing 10 is arranged in the interior of the external housing 30. The stator housing 10, secured to the axle 21, is secured stationarily and in particular in a rotationally fixed manner with respect to the frame of the conveyor device.

[0041] A first bearing unit 23 is arranged between the bearing section 22 and the external housing 30 on a bearing section 22 of the axle 21 or around the bearing section 22. The external housing 30 is rotatably mounted on the axle 21 in a circumferential direction around the longitudinal axis L. The first bearing unit 23 includes both a radial bearing and a sealing element. Thus, the reel motor 1 or the interior of the external housing 30 is sealed against a penetration of foreign bodies and moisture by the bearing unit 23.

[0042] On a side of the external housing 30 facing the bearing unit 23, a stub axle 21 is provided concentrically with respect to the longitudinal axis L. The facing side of the external housing 30 can be supported on the frame of the conveyor device by the stub axle 12. The stub axle 21 also has a bearing section 22. A second bearing unit 23 with a radial bearing and a sealing element is arranged on the bearing section 22. The bearing unit 23, arranged between the external housing 30 and the bearing section 22 of the stub axle 21, supports the external housing 30 on the side of the stub axle 21. It is rotatably mounted around the stub axle or around the longitudinal axis L.

[0043] The first bearing unit 23 or the second bearing unit 23 can furthermore also comprise an axial bearing that is not shown.

[0044] In the axial direction along the longitudinal axis L, a securing section 24 of the axle 21 immediately adjoins the bearing section 22. The stator housing 10 is secured to section 24 by one of its external sections. Openings 15 are arranged in two planes, spaced from one another, in the axial direction along the longitudinal axis L in the external section of the stator housing. A bearing plate 16 is arranged adjoining the external section in the stator housing 10. The rotor shaft 13 is mounted rotatably around the longitudinal axis L on the bearing plate 16 by means of a bearing 17. Furthermore, the bearing plate 16 provides multiple flow passages 18. Flow passages 18 in the form of nozzles fluidically connect the external section. The stator housing 10 is connected on the securing section 24, to the middle section of the stator housing 10.

[0045] In the middle section of the stator housing 10, the stator 11, with windings, is arranged. Here, the stator 11 is accommodated by the stator housing 10. It is secured in the stator housing. The stator 11 turns the rotor 12, which is secured on the rotor shaft 13, in the circumferential direction around the longitudinal axis L.

[0046] The impeller wheel 14 is secured on the rotor shaft 13, on a side facing away from the bearing plate 16. The impeller wheel 14 is driven by rotation of the rotor shaft 13. The section of the stator housing 10 facing the impeller wheel 14, when viewed in radial direction from the longitudinal axis L, forms the second external section of the stator housing 10. Openings 15 are also arranged in the second external section.

[0047] A gearbox 41 is additionally arranged in the stator housing 10 and connected to it in the second external section of the stator housing 10. The gearbox 41 is connected on the input side to the rotor shaft 13 and is driven by the rotor shaft. On the output side, the gearbox 41 or an output shaft of the gearbox 41 is connected via an intermediate piece 42 to the external housing 30. By rotation of the rotor 12 or the rotor shaft 13 connected to the rotor, the impeller wheel 14, and at the same time, via the gearbox 41 as well as the intermediate piece 42, the external housing 30 can be rotated.

[0048] In order to enable frictionless rotation of the external housing 30 around the stator housing 10, they are spaced from one another. An air gap is formed between the housings. The air gap determines the cooling duct 20 that extends at least between the openings 15 of the external sections of the stator housing 10 and over the middle section of the stator housing 10.

[0049] In the represented embodiment example, the impeller wheel 14 is a radial impeller wheel that suctions air from the middle section of the stator housing 10 and blows it in the radial direction through the openings 15 into the cooling duct 20. The air is suctioned by the impeller wheel 14 from the middle section of the stator housing 10. The stator housing is airtight in the radial direction in the middle section. Thus, air is suctioned from the external marginal section of the stator housing 10 on the side of the securing section 24 and suctioned through the openings 15 arranged there from the cooling duct 20. In the cooling duct 20, an air flow forms from the openings 15 arranged on the impeller wheel 14 to the openings 15 spaced apart along the longitudinal axis L. The air flow in the cooling circuit or the cooling air flow K, is indicated by arrows along the flow path, is driven by the impeller wheel 14 through the stator 11. In the process, it takes up heat from the stator 11 and runs along through the cooling duct 20 on the external housing 30. The heat taken up on the stator 11 is released onto the external housing 30. Thus, the cooling air flow K heated on the stator 11 is cooled again on its way through the cooling duct 20. This is before it is suctioned again into the stator housing 10 through the openings 15 on the side of the securing section 24. The external housing 30 releases the heat transmitted by the cooling air flow K to the environment. This results in the formation of a closed cooling circuit that is isolated from the environment.

[0050] In or on the securing section 24, motor electronics can in addition be accommodated. The cooling air flow K can be guided past the motor electronics in a targeted manner in order to also cool the motor electronics at the same time in addition to the stator.

[0051] The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.