The invention will be explained in more detail with reference to the exemplary embodiments illustrated in the drawing, in which:
FIG. 1 shows a rotary electrical machine with a cooling device,
FIG. 2 shows a first type of cooling device,
FIG. 3 shows a further type of cooling device,
FIG. 4 shows a further type of cooling device, which has a partition wall,
FIG. 5 shows a section through the cooling device shown in FIG. 4,
FIG. 6 shows a further section through the cooling device shown in FIG. 4,
FIG. 7 shows a further type of cooling device, which has two partition walls,
FIG. 8 shows a further type of cooling device, which has a pipe-in-pipe system,
FIG. 9 shows a further type of cooling device, which has a rod-shaped heat-conducting means, which bears against the housing of the electrical machine,
FIG. 10 shows a section through the cooling device shown in FIG. 9,
FIG. 11 shows a further type of cooling device,
FIG. 12 shows a section through the cooling device shown in FIG. 11, and
FIG. 13 shows a linear motor with a cooling device.
The illustration shown in FIG. 1 shows an electrical machine 10. The electrical machine 10 is a rotary electrical machine without a housing and having an axis 12. Furthermore, the electrical machine 10 has a shaft 16 and a stator 14. Accommodating channels 5 are provided in the stator 14. The accommodating channels 5 are used for accommodating rod-shaped heat-conducting means 3. The illustration shown in FIG. 1 also shows a cooling device 1. The cooling device 1 has connections 24 and 25. The connections are used, for example, for accommodating or emitting cooling liquid or else cooling air. Furthermore, the cooling device 1 has rod-shaped heat-conducting means 3. The rod-shaped heat-conducting means 3 are designed such that they can be introduced into the accommodating channels 5. In a further configuration, which is not illustrated in FIG. 1, however, the stator 14 has the rod-shaped heat-conducting means 3, the rod-shaped heat-conducting means 3 protruding out of a front end 15 of the electrical machine 10, a cooling device I being capable of being placed onto the protruding parts of the rod-shaped heat-conducting means 3.
The electrical machine 10 in FIG. 1 therefore has accommodating channels 5 as axial cutouts at suitable points on its front end 15. Suitable points are, in particular, those which are not provided for guiding a magnetic flux. The axial cutouts, which can be produced, for example, by means of a drilled hole, do not impair the normal operation of the electrical machine 10 without cooling. If required, the cooling device 1 can then be placed axially onto an operating side 15 of the electrical machine and fixed in a suitable manner. The cooling device 1 has a number of rod-shaped heat-conducting means 3 which corresponds to the number and shape of the cutouts, these heat-conducting means, preferably provided with a heat-conducting paste, dipping precisely into these cutouts.
The illustration shown in FIG. 2 shows a detail of a stator 14, in which a rod-shaped heat-conducting means 3 is located. The rod-shaped heat-conducting means protrudes beyond the front end 15 of the stator 14. A cooling channel 20 is placed on the protruding section of the rod-shaped heat-conducting means 3. The cooling channel 20 is provided, for example, for guiding cooling liquid. A possible direction of flow 21 of the cooling liquid is illustrated by an arrow. The rod-shaped heat-conducting means 3 protrudes into the cooling channel 20 and, in the process, has cooling liquid flowing around it, with the result that heat dissipation can be realized.
The illustration shown in FIG. 3 shows a further embodiment of possible heat dissipation. The rod-shaped heat-conducting means 3 is located in a stator 14, which is illustrated as a detail. The rod-shaped heat-conducting means 3 protrudes out of the stator 14. A heat sink 22 is placed on the protruding part of the rod-shaped heat-conducting means 3. The heat dissipation from the rod-shaped heat-conducting means 3 into the heat sink 22 is achieved in a particularly advantageous manner by the use of a heat-conducting paste 23.
The illustration shown in FIG. 4 shows a further possibility for cooling the stator 14. A pipe 35 is introduced into the stator 14. The pipe 35 is a possible embodiment of the rod-shaped heat-conducting means. The cooling channel 20 is plugged onto the pipe 35, with the result that, for example, a cooling liquid can be conducted directly through said cooling channel 20. The pipe 35, which is closed at one end, and the cooling channel 20 are split by a separating means 29 such that a coolant is guided from the cooling channel 20 into a first half of the pipe 35, and the coolant is guided into a second half of the pipe 35 at a base 45 of the pipe 35. The separating means 29 is a type of wall, which divides the pipe 35 into a first half and a second half, the wall reaching from the cooling channel 20 almost up to the base 45 of the pipe 35. The first half forms a channel 70 and the second half forms a channel 71. The base 45 is therefore spaced apart from the separating means 29. The separating means 29, which is manufactured, for example, from sheet metal, is arranged within the cooling channel 20 such that the coolant is conducted partially or completely into the pipe 35. In the illustration shown in FIG. 4, a direction of flow of coolant is illustrated by means of arrows 27, a forward flow being formed by the channel 70 and a return flow being formed by the channel 71. The pipe 35 has been plugged into the stator 14 either in communication with the cooling channel 20 or else separate from it, with the result that, once the pipe 35 has been plugged into the stator 14, the cooling channel 20 is then plugged onto that part of the pipe 35 which protrudes beyond the front end 15 of the stator 14.
The illustration shown in FIG. 4 also shows two sectional planes V and VI. The sectional plane V is illustrated in FIG. 5 and shows a cross section of the pipe 35. The pipe 35 is split into two channels 70 and 71 by the separating means 29, which acts as a type of wall. The direction of flow of the coolant is indicated by circles. The sectional plane VI, which is illustrated in FIG. 6, shows a plan view 37. In this sectional plane VI it is shown that the separating means 29 does not reach up to the base of the pipe 35, with the result that there is a connection between the forward flow and the return flow. Furthermore, a wall 33 of the cooling channel 20 is also shown.
The illustration shown in FIG. 7 shows a further embodiment of a pipe 35, which is introduced into a stator 14 as a rod-shaped heat-conducting means. The pipe 35 now has two separating means 29 and 30, the separating means being in the form of partition walls, as was already the case in FIG. 4. The connection of the pipe 35 again takes place by a cooling channel 20. A cooljet 39 is used for introducing a coolant into the pipe 35. The profile of the direction of flow of coolants (gaseous or liquid) 27 is also illustrated in FIG. 7 by means of arrows 27.
The illustration shown in FIG. 8 shows a pipe 35, into which an injection pipe 41 is introduced. The injection pipe 41 leads into the region of the base 45 of the pipe 35. The injection pipe not only protrudes into the pipe 35 but also into the cooling channel 20. In this case, the positioning of the injection pipe 41 into the cooling channel 20 is implemented such that the injection pipe 41 takes up the cooling liquid in the region in which the coolant is supplied. The injection pipe 41 is sealed off from the cooling channel 20 by means of a seal 43.
The illustration shown in FIG. 9 shows a housing 18 of an electrical machine, which is not illustrated in any more detail. A rod-shaped heat-conducting means 4 bears against the housing 18. In particular corners of the housing and/or of the stator of the electrical machine are suitable for this purpose. The rod-shaped heat-conducting means 4 is fixed to the housing 18, for example, via a toothed portion 49, the illustrated toothed portion being a dovetailed connection. The rod-shaped heat-conducting means 4, which have a base 46, is designed such that it does not reach up to a housing end 19. This is shown in FIG. 10, FIG. 10 illustrating a section X from FIG. 9. As illustrated in FIG. 10, the base 46 therefore ends in front of the housing end 19. Furthermore, the base 46 is flattened obliquely such that easier access to a fixing means 47 is possible. The fixing means 47 is, for example, a drilled hole, which is used for fixing the housing 18 on a base plate. The illustration shown in FIG. 11 shows a further embodiment of the cooling device 2. A rod-shaped heat-conducting means 3 is located in the stator 14 of an electrical machine 10. The rod-shaped heat-conducting means 3 is in the form of solid material and consequently does not have a cavity. The rod-shaped heat-conducting means 3 protrudes out of the stator 14. A cooling device is placed onto the rod-shaped heat-conducting means 3. The cooling device has a fan 51. The fan 51 has a fan motor 55. Cooling air can be sucked by means of the fan 51. The profile of the cooling air is illustrated by arrows 27. The cooling air is guided to the rod-shaped heat-conducting means 3 via channels 72, only one rod-shaped heat-conducting means 3 being illustrated in FIG. 8, but it being possible for a plurality to be provided on the electrical machine 10. The rod-shaped heat-conducting means 3 is placed onto a cooling grating 75, which is illustrated in detail in FIG. 12. FIG. 12 shows a section XII from FIG. 11. The cooling grating 75 illustrated in FIG. 12 has cooling air channels 59 and cooling ribs 57. The rod-shaped heat-conducting means 3 is now placed onto the cooling grating 75 such that the rod-shaped heat-conducting means 3 emits heat to the cooling ribs 57, it being possible for heat to be emitted, via the cooling ribs 57, to cooling air which is guided past it and can be driven by means of the fan.
The illustration shown in FIG. 13 shows a linear motor 64, which has a primary part 60 and a secondary part 62. The primary part 60 has accommodating channels 5. The accommodating channels 5 serve the purpose of accommodating rod-shaped heat-conducting means 3 of a cooling device 1. The illustration shown in FIG. 13 shows that the cooling device according to the invention can be used not only in rotary electrical machines but also in linear motors. Furthermore, it can be seen from FIG. 13 that an axial alignment of the rod-shaped heat-conducting means 3 is not necessary or advantageous in every case, and therefore another alignment is also possible.
Patent Application
20080073985
