DE102021002237A1 - Drive with connection box - Google Patents

Abstract

Drive with connection box, the connection box having a lower part and a cover part connected to the lower part, a power module, in particular a heat-generating power module, being connected to a cooling plate, the cooling plate being connected to a holding part, the holding part of at least one on the lower part supported spring part to the cover part, in particular to the inside of the cover part, is arranged pressed.

Description

The invention relates to a drive with a connection box.

From the DE 103 28 228 B4 a drive, in particular a compact drive, designed as a converter motor with a gear unit is known.

From the DE 10 2018 000 961 A1 an electronic arrangement with a power module is known.

From the DE 10 2011 005 890 A1 an electronic device with a circuit carrier in a slide-in housing is known.

From the DE 10 2012 202 785 A1 a semiconductor device is known.

From the DE 102 39 512 A1 an arrangement for accommodating the power and control electronics of an electric motor is known.

From the DE 11 2007 002 019 T5 a motor control device is known.

A heat sink in a PC is known from US 2006/0 275 100 A1.

A power converter is known from US 2015/0 123 261 A1.

A cooling arrangement is known from US 2013/0 250 523 A1.

The invention is therefore based on the object of designing a drive to be produced in a simple manner.

According to the invention, the object is achieved in the drive according to the features specified in claim 1 or 2.

Important features of the invention in the drive, in particular compact drive, with connection box are that the connection box has a lower part and a cover part connected to the lower part,
wherein a power module, in particular a heat-generating power module, is connected to a cooling plate,
wherein the cooling plate is connected to a holding part,
wherein the holding part is arranged pressed against the cover part, in particular towards the inside of the cover part, by at least one spring part supported on the lower part.

The advantage here is that the power module including the cooling plate can be designed in a precompleted manner. The cover part can thus be removed and the power module, to which the cooling plate is also connected, is nevertheless held by the holding part. In this way, a simple production, in particular also the wiring within the connection box, in particular with the cover part removed, can be carried out. Due to the precompletion, the power module is also held by the holding part, which is attached to the lower part. This guarantees a robust structure. In addition, the holding part surrounds one connected to the power module

PCB stack form-fitting. In this way, the electronics fitted on it are also arranged in a protected manner.

In an advantageous embodiment, the power module is fitted on a first printed circuit board of a printed circuit board stack,
wherein the circuit board stack has at least one second circuit board which is aligned parallel to the first circuit board. The advantage here is that simple production is made possible.

In an advantageous embodiment, the first and second circuit boards are connected at least by means of a pin which is pushed through these circuit boards, in particular and is soldered to the circuit boards. The advantage here is that simple production is made possible.

In an advantageous embodiment, the cover part has cooling ribs and / or cooling fingers on its surface, in particular on its outer surface. The advantage here is that improved heat dissipation can be achieved.

In an advantageous embodiment, the holding part has a recess, the power module protruding through the recess, in particular towards the cooling plate. The advantage here is that improved heat dissipation can be achieved. This is because the cooling plate can be produced from a thermally more conductive material than the holding part and thus enables the heat generated by the power module to be introduced directly, i.e. not indirectly via the holding part. Thus, the holding part can then be produced from a more stable material than the cooling plate.

In an advantageous embodiment, the first printed circuit board is arranged on the side of the holding part facing away from the cooling plate. The advantage here is that the holding part is interposed and thus the power module in the recess is spaced from the holding part. Thus, thermally induced expansions can be absorbed.

In an advantageous embodiment, the cooling plate covers, covers and / or closes the recess. The advantage here is that in Transverse direction to the stacking direction of the printed circuit board stack is more extended than in the direction parallel to the stacking direction.

In an advantageous embodiment, the spring part is arranged between the holding part and the lower part. The advantage here is that the spring part can be supported on the lower part and the holding part can be acted upon from the spring part to the cover part hi, ie away from the lower part, with the spring force generated by the spring part. The spring part is thus arranged preloaded in the connection box between the holding part and the lower part.

In an advantageous embodiment, the movement of the holding part is guided by means of a guide means. The advantage here is that a robust mode of operation can be achieved.

In an advantageous embodiment, the movement of the holding part is limited by means of a limiting means. The advantage here is that the pre-completed unit can be held together by means of the holding means, because the holding means remains on the lower part through the delimiting means, in particular therefore cannot move further from the latter than is predetermined by the delimiting means.

In an advantageous embodiment, a bush acts as a guide means. The advantage here is that the spring part can be moved back and forth along the socket.

In an advantageous embodiment, either a screw with a screw head and screwed into a threaded hole in the lower part or a bolt inserted or screwed into a hole in the lower part with a nut screwed onto a threaded area of the bolt acts as the limiting means. The advantage here is that simple and inexpensive manufacture can be achieved. In particular, very inexpensive parts can be used.

In an advantageous embodiment, the spring part, in particular the spring part designed as an annular spring, is slipped onto the socket or a socket,
wherein the socket protrudes through a further recess of the holding part,
in particular wherein the bushing rests on the limiting means, in particular on a washer, on a nut or on a screw head. The advantage here is that the spring part is guided and thus a means that is easy to manufacture and in which a safe mode of operation can be carried out can be used.

In an advantageous embodiment, one or the bolt protrudes through the bushing, in particular and thus also through the holding part,
wherein the bolt is inserted or screwed into the lower part and has one or the limiting means on the side of the holding part facing away from the lower part or is connected to the or with a limiting means. The advantage here is that the bolt carries the limiting means which limits the freedom of movement, in particular the play, of the holding part. Thus, although the holding means can move back and forth along the bushing, this movement is limited by a limiting means. The lower part connected to the stack of printed circuit boards is thus configured in a precompleted manner.

In an advantageous embodiment, the holding part has a preferably flat base area,
wherein the holding part has that recess through which the power module protrudes, in particular protrudes towards the cooling plate,
with arm areas of the holding part adjoining the base area,
wherein the arm areas are all spaced from one another, in particular in the circumferential direction based on a normal direction of a plane receiving a circuit board of the circuit board stack,
in particular, each arm region having a recess through which a respective socket protrudes. The advantage here is that the arm areas laterally delimit the stack of printed circuit boards and thus this stack of printed circuit boards is held in a form-fitting manner. In addition, thanks to their curved design, the arm areas enable a large distance to be provided between the cover part and the lower part, in particular a greater distance than the extent from the contact area of the spring part with the lower part to the contact area of the cooling plate on the inside of the cover part.

In an advantageous embodiment, each arm area has at least two, in particular opposing, bending points,
in particular wherein the amount of the bending angle of each bending point is between 70 ° and 110 °, in particular 90 °. The advantage here is that a large distance between the cover part and the lower part can be bridged.

• - größer als die Ausdehnung des Leiterplattenstapels samt Leistungsmodul und Kühlplatte,
• - oder größer als die Summe aus der Ausdehnung des Federteils und aus der Ausdehnung des Leiterplattenstapels samt Leistungsmodul und Kühlplatte, wobei die Ausdehnung in Normalenrichtung einer eine Leiterplatte des Leiterplattenstapels aufnehmenden Ebene gemessen wird. Von Vorteil ist dabei, dass genügend Freiraum für Leitungen, Kabel und dergleichen sowie Montageraum zur Betätigung von Schrauben und dergleichen vorsehbar ist.

In an advantageous embodiment, the distance between the area of the spring part touching the lower part and the area of the cooling plate touching the cover part is

• - greater than the expansion of the stack of printed circuit boards including the power module and cooling plate,
• - Or greater than the sum of the expansion of the spring part and the expansion of the circuit board stack including the power module and cooling plate, the expansion being measured in the normal direction of a plane receiving a circuit board of the circuit board stack will. The advantage here is that sufficient free space can be provided for lines, cables and the like, as well as assembly space for actuating screws and the like.

In an advantageous embodiment, the distance between the bore of the lower part receiving the bolts and the contact area of the cooling plate and the cover part is greater than the extent of the printed circuit board stack including the power module and cooling plate,
wherein the extent in the normal direction of a plane receiving a circuit board of the circuit board stack is measured. The advantage here is that greater distances are provided for making electrical connections to the lines and thus simpler production can be carried out.

In an advantageous embodiment, a connector part is fitted on a third circuit board of the circuit board stack,
which can be plugged into a mating connector part, with the contacts of which the stator winding lines of the electric motor of the drive are connected, in particular are connected in an electrically conductive manner,
and / or to the contacts of which a bus line and / or supply line guided through a screwed cable connection are connected, in particular are connected in an electrically conductive manner. The advantage here is that simple contacting can be carried out by means of plug-in connections of a mating plug-in connector part.

In an advantageous embodiment, the cooling plate is made of metal, in particular aluminum,
wherein the holding part is made of metal, in particular steel,
wherein the cover part is made of metal, in particular aluminum. The advantage here is that the high thermal conductivity enables efficient dissipation of the heat flow of the power module and the holding part transmits a high pressure force. Since the power module protrudes through the recess in the holding part and is connected to the aluminum cooling plate, the power module is at a distance from the holding part. Therefore, the holding part may be made of a different material so that the thermally induced, different thermal expansion in the spacing can be absorbed.

Further advantages result from the subclaims. The invention is not restricted to the combination of features of the claims. For the person skilled in the art, there are further sensible possible combinations of claims and / or individual claim features and / or features of the description and / or the figures, in particular from the task and / or the task posed by comparison with the prior art.

• In der 1 ist eine Vorderansicht auf einen erfindungsgemäßen Antrieb mit einem ein Deckelteil aufweisenden Anschlusskasten dargestellt.
• In der 2 ist eine Seitenansicht des Antriebs bei entferntem Deckelteil gezeigt.
• In der 3 ist ein Längsschnitt durch den Bereich des Anschlusskastens gezeigt.
• In der 4 ist eine Schrägansicht des Antriebs bei entferntem Deckelteil gezeigt.
• In der 5 ist eine Vorderansicht auf ein Halteteil 21 mit einem Leiterplattenstapel 22 gezeigt.
• In der 6 ist ein Querschnitt durch das Halteteil 21 und dem Leiterplattenstapel 22 gezeigt.
• In der 7 ist eine Draufsicht auf den Anschlusskasten bei entferntem Deckelteil 2 gezeigt.

The invention will now be explained in more detail with reference to schematic figures:

• In the 1 is a front view of a drive according to the invention with a connection box having a cover part.
• In the 2 a side view of the drive is shown with the cover part removed.
• In the 3 a longitudinal section through the area of the connection box is shown.
• In the 4th an oblique view of the drive is shown with the cover part removed.
• In the 5 Fig. 3 is a front view of a holding member 21 with a stack of printed circuit boards 22nd shown.
• In the 6th is a cross section through the holding part 21 and the circuit board stack 22nd shown.
• In the 7th Fig. 3 is a plan view of the junction box with the cover part removed 2 shown.

As shown in the figures, the drive has an electric motor, in particular with a gear, the connection box of the electric motor being a lower part 1 and a lid part placed thereon to form the junction box 2 having.

The lid part 2 has cooling fins in particular on its outside facing away from the electric motor.

There is a stack of printed circuit boards in the junction box 22nd arranged.

A first of the circuit boards 61 is with a power module 65 equipped, which has controllable semiconductor switches, in particular MOSFET or IGBT. The semiconductor switches are preferably arranged in three half bridges connected in parallel to one another, so that they form an inverter from which the electric motor can be fed and can thus be operated in a speed-controlled manner.

A second circuit board 62 of the PCB stack 22nd is equipped with signal electronics which, in particular, pulse-width-modulated control signals for the controllable semiconductor switches on the first circuit board 61 generated.

A third circuit board 63 of the PCB stack 22nd is equipped with a connector part.

The first circuit board 61 , the second printed circuit board 62 and the third circuit board 63 are connected by pins that go through these circuit boards ( 61 , 62 , 63 ) put through in particular and are soldered. The stack of printed circuit boards thus formed 22nd is with its power module 65 to the cooling plate 20th pressed on.

The one from the power module 65 The heat flow generated is thus in the cooling plate 20th spread open and by pressing the cooling plate 20th to the cover part 2 , especially on the inside of the cover part 2 , dissipated to the environment.

The lid part 2 has cooling fins on its outside so that heat is dissipated to the environment through the enlarged surface.

The pressing of the stack of printed circuit boards 22nd is made by spring parts 51 causes which on sockets 60 are attached and on the one hand on the lower part 1 support and on the other hand on a holding part 21 on which the cooling plate 20th rests, so that from the spring parts 51 holding part acted upon by force 21 the cooling plate 20th to the cover part 2 , especially on the inside of the cover part 2 , presses.

There is preferably also thermal paste between the cooling plate 20th and the lid part 2 can be arranged.

The holding part 21 is thus from the lid part 2 remote side of the cooling plate 20th arranged.

Through the respective socket 60 protrudes a bolt 50 , whose first end region in a hole in the lower part 1 is at least partially inserted or whose first end region is designed as a threaded region and into a threaded hole in the lower part 1 is screwed in. The other end of the bolt 50 has a threaded area on which a nut 52 is screwed, on which a perforated disc 53 which is applied to the socket 60 is applied. By unscrewing the nut 52 on the threaded area of the bolt 50 thus becomes the socket 60 on the lower part 1 recorded and also the working area of the socket 60 attached spring part 51 limited.

The spring part 51 so presses the holding part 21 towards the perforated disc 53 , especially washer. However, this becomes the holding part 21 towards the lid part 2 pressed down and therefore the cooling plate 20th on the inside of the lid part 2 .

As in 7th shown is the cooling plate 20th by means of the first screws 71 with the holding part 21 tied together. By means of second screws 72 is the cooling plate 20th with the power module 65 of the PCB stack 22nd tied together.

The holding part 21 is preferably designed as a stamped and bent part.

The holding part 21 has a recess through which the power module 65 protrudes through, in particular with the one on the holding part 21 overlying cooling plate 20th to be connectable.

The first screws 71 are with their thread area in the holding part 21 screwed, in particular into a hole made there. The head of a respective screw 71 presses the cooling plate 20th on the holding part 21 .

The second screws 72 are with their thread area in the power module 65 screwed, in particular into a hole made there. The head of a respective screw 72 presses the cooling plate 20th on the power module 65 .

The holding part 21 has a preferably flat base area which has the recess through which the power module 65 protrudes to the cooling plate.

Arm areas are connected at the base area, the arm areas all being spaced from one another and each having a recess through which the respective socket 60 protrudes through this respective socket 60 the respective bolt 50 protrudes.

So that's the PCB stack 22nd including power module 65 arranged within the connection box of the drive that the cover part is protected 2 and the lower part 1 surround him to form the housing. Am on the third circuit board 63 equipped connector part 64 a mating connector part can be connected so that the lines of the stator winding coming from the electric motor of the drive can be electrically connected and / or the lines coming from an electrical alternating voltage source.

The PCB stack 22nd preferably acts as a converter so that the speed or the torque of the electric motor can be regulated.

Each arm area has two bending points, each of which has a bending of 90 °, in particular wherein the first bending point is designed in the opposite direction to the second bending point. Thus are spring parts 51 usable in the direction of the central axis of the bolt 50 or the socket 60 are less extensive than the stack of printed circuit boards.

In any case, it is important that the distance between the the bolts 50 receiving bore of the lower part 1 and the contact area of the cooling plate 20th and the lid part 2 is greater than the expansion of the stack of printed circuit boards 22nd including power module 65 and cooling plate 20th .

This central axis is preferably aligned parallel to the normal direction of that plane which contains one of the printed circuit boards ( 61 , 62 , 63 ) contains.

A data bus line is through one in the wall of the base 1 arranged cable entry to the connector part 64 of the PCB stack 22nd guided.

As in 4th shown surrounds the holding part 21 the stack of printed circuit boards with its arm areas 22nd spider-like and / or claw-like. Thus the circuit boards ( 61 , 62 , 63 ) preferably form-fitting in the holding part 21 added as at each of the not the lower part 1 facing side surfaces of the stack of printed circuit boards 22nd at least one arm area is arranged in each case.

In further exemplary embodiments according to the invention, instead of the nut with a washer, a differently designed limitation for the freedom of movement of the holding part is implemented. For example, there is no socket 60 and the bolt has a widening instead of a screwed nut 52 and attached perforated disc 53 . So instead of the bolt 50 also a screw with a screw head in a threaded hole in the lower part 1 screwable.

Thus there is also a bushing for guiding the spring part 51 not necessary because the screw or the bolt 50 can take the lead. For this purpose, there is preferably a smooth surface on the screw or on the bolt 50 executed.

List of reference symbols

1

Lower part

2

Cover part

20th

Cooling plate

21

Holding part

22nd

PCB stack connected with pins

50

bolt

51

Spring part

52

mother

53

Perforated washer, especially a washer

60

Rifle

61

first circuit board of the circuit board stack 22

62

second printed circuit board of the printed circuit board stack 22

63

third circuit board of the circuit board stack 22

64

Connector part

65

Power module

71

first screws to connect the holding part 21 with the cooling plate 20

72

second screws for connecting the holding part 21 with the power module 65

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10328228 B4 [0002]
• DE 102018000961 A1 [0003]
• DE 102011005890 A1 [0004]
• DE 102012202785 A1 [0005]
• DE 10239512 A1 [0006]
• DE 112007002019 T5 [0007]

Claims (15)

Drive with connection box, wherein the connection box has a lower part and a cover part connected to the lower part, wherein a power module, in particular a heat-generating power module, is connected to a cooling plate, wherein the cooling plate is connected to a holding part, wherein the holding part is arranged pressed against the cover part, in particular towards the inside of the cover part, by at least one spring part supported on the lower part. Drive with connection box, wherein the connection box has a lower part and a cover part connected to the lower part, where a power module is connected to a cooling plate, wherein the cooling plate is connected to a holding part, wherein the holding part is arranged pressed towards the cover part by at least one spring part supported on the lower part wherein the holding part has a preferably flat base area, wherein the holding part has that recess through which the power module protrudes, with arm areas of the holding part adjoining the base area, wherein the arm areas are all spaced from each other, wherein each arm region has at least two bending points, in particular opposing one another. Drive after Claim 1 or 2 , characterized in that the power module is fitted on a first printed circuit board of a printed circuit board stack, the printed circuit board stack having at least one second printed circuit board which is aligned parallel to the first printed circuit board. Drive according to one of the preceding claims, characterized in that the first and second circuit boards are connected at least by means of a pin which is pushed through these circuit boards (61, 62, 63), in particular and which is connected to the circuit boards (61, 62, 63) is soldered, and / or that the cover part has cooling ribs and / or cooling fingers on its surface, in particular on its outer surface. Drive according to one of the preceding claims, characterized in that the holding part has a recess, the power module protruding through the recess, in particular towards the cooling plate. Drive according to one of the preceding claims, characterized in that the first printed circuit board is arranged on the side of the holding part facing away from the cooling plate. Drive according to one of the preceding claims, characterized in that the cooling plate covers, covers and / or closes the recess, and / or that the spring part is arranged between the holding part and the lower part. Drive according to one of the preceding claims, characterized in that the movement of the holding part is guided by means of a guide means and / or that the movement of the holding part is limited by means of a limiting means. Drive according to one of the preceding claims, characterized in that a bushing functions as a guide means and / or that a screw with a screw head, screwed into a threaded hole in the lower part or a bolt inserted or screwed into a hole in the lower part with on a threaded area of the Bolt screwed nut acts. Drive according to one of the preceding claims, characterized in that the spring part, in particular the spring part designed as an annular spring, is plugged onto the socket or a socket, the socket protruding through a further recess in the holding part, in particular the socket resting against the limiting means, in particular on a washer, on a nut or on a screw head. Drive according to one of the preceding claims, characterized in that one or the bolt protrudes through the bushing, in particular and thus also protrudes through the holding part, wherein the bolt is inserted or screwed into the lower part and on the side of the holding part facing away from the lower part a or the Has limiting means or is connected to or with a limiting means. Drive according to one of the preceding claims, characterized in that the holding part has a preferably flat base area, the holding part having that recess through which the power module protrudes, in particular to the cooling plate, with arm areas of the holding part adjoining the base area, the arm areas all from one another are spaced apart, in particular in the circumferential direction based on a normal direction of a plane receiving a circuit board of the circuit board stack, in particular each arm region having a recess through which a respective socket protrudes. Drive according to one of the preceding claims, characterized in that each arm area has at least two, in particular opposing, bending points, in particular wherein the amount of the bending angle of each bending point is between 70 ° and 110 °, in particular 90 °, and / or that the distance between the area of the spring part touching the lower part and the area of the cooling plate touching the cover part - is greater than the expansion of the circuit board stack including the power module and cooling plate, - or greater than the sum of the expansion of the spring part and the expansion of the circuit board stack including the power module and cooling plate , the extent in the normal direction of a plane receiving a printed circuit board of the printed circuit board stack being measured. Drive according to one of the preceding claims, characterized in that the distance between the bolt receiving hole of the lower part and the contact area of the cooling plate and the cover part is greater than the expansion of the circuit board stack including the power module and cooling plate, the expansion in the normal direction of a circuit board of the PCB stack receiving level is measured. Drive according to one of the preceding claims, characterized in that a plug connector part is fitted on a third printed circuit board of the printed circuit board stack, which connector part can be plugged into a mating connector part, with the contacts of which stator winding lines of the electric motor of the drive are connected, in particular are electrically conductively connected, and / or with the contacts of which are connected to a bus line and / or supply line guided through a cable gland, in particular are connected in an electrically conductive manner, and / or that the cooling plate is made of metal, in particular aluminum, the holding part being made of metal, in particular steel, the Lid part is made of metal, in particular aluminum.

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