DE102011011302A1 - Arrangement for cooling a coil and inverter - Google Patents

Abstract

Arrangement for cooling a coil, which has a winding arranged on a coil core, and converter, the arrangement having a coil, a fan and at least one air guide, channels being arranged in the winding region of the coil, the air flow generated by the fan being at least partially by means of of the air guide is directed into the channels.

Description

The invention relates to an arrangement for cooling a coil and a converter.

It is well known that coils have a winding which is usually arranged around a coil core. In this case, the coil winding has a coil axis, so that the coil winding can be produced wound around the coil axis in the circumferential direction. Coils are used as inductors in electrical appliances, for example as components of filters, such as mains side filters or the like.

The invention is therefore based on the object to develop a coil assembly, wherein the cooling of the coil to be improved.

According to the invention the object is achieved in the arrangement for cooling a coil according to the features specified in claim 1 and in the inverter according to the features indicated in claim 12.

Important features of the invention in the arrangement are that the arrangement is provided for cooling a coil, which has a winding arranged on a coil core,
the arrangement comprising a coil, a fan and at least one air guiding means,
wherein channels are arranged in the winding region of the coil,
wherein the air flow generated by the fan is at least partially conducted by means of the air guide into the channels.

The advantage here is that by means of the arrangement of channels in the winding region of the coil, a particularly effective cooling of the coil can be achieved. In addition, a fan is provided, which makes an active cooling feasible. In this way, a very effective cooling is thus achievable.

In an advantageous embodiment, the coil winding is surrounded by a first insulating means, in particular insulating paper, in particular mineral fiber paper,
wherein a second insulating means is disposed overlapping with the first insulating means which projects beyond the axial region covered by the coil winding and functions as an air guiding means,
in particular so that an air flow generated by the fan is supplied to the channels. The advantage here is that the coil outside, that is electrically isolable at its outer periphery. Thus, the risk of an accident on contact can be reduced. In addition, a second insulating means is attached to the first, so that an air guide is formed. In the mounting area so the electrical insulation is further improved and in addition creates a superior area, which makes an additional function executable, namely the air conduction of the fan-driven air flow to the channels out. In this way, the air line and thus the cooling is improved.

Due to the active ventilation of the channels, these channels are closely executable and therefore a compact powerful winding can be produced.

In an advantageous embodiment, first and second insulating means are made of the same material. The advantage here is that without special material and / or special storage of another component, the second insulating is available. In particular, the same insulating paper can be used as the first and second insulating means. By merely different positioning of the paper thus an air guide can be produced and the cooling in a simple and cost-effective manner can be improved.

In an advantageous embodiment, channels are equally spaced in the circumferential direction, in particular three, four, five or more channels are arranged on one, in particular the same, radial distance. The advantage here is that as uniform as possible cooling of the coil executable and thus the most uniform temperature distribution can be achieved.

In an advantageous embodiment, the channels are formed by means of respective hollow parts, which are provided in the Wicklungsberiech, in particular wrapped. The advantage here is that the hollow parts predetermine the formation of the channels and thus independent of the winding of the channel cross-section is determined. In addition, the channels together with their walls, so the walls of the hollow parts, insulating.

In an advantageous embodiment, the channels and / or the hollow parts are each formed cuboid. The advantage here is that a particularly simple production is possible. In addition, the cuboid flat executable and thus effective cooling can be achieved.

In an advantageous embodiment, the channels and / or the hollow parts are each formed sickle-shaped, wherein the sickle extends in the circumferential direction, in particular wherein the sickle has a substantially constant radial extent. The advantage here is that an effective heat dissipation and a high winding density can be achieved.

In an advantageous embodiment, the radial width a at the center or geometric center of gravity of a channel cross-section and the length b in the circumferential direction or tangential direction are such chosen that the ratio a / b is between 0.05 and 0.2.

In particular, the length b and the radius r of the center point or center of gravity are selected such that b / r is between 0.5 and 2. The advantage here is that the channels are very narrow executable, so are only slightly extended to the Spulenachsrichtung radial direction, and are extended as long as possible in the circumferential direction or tangential direction, ie substantially parallel to the respective winding layer. In this case, one of the narrow channel cross section despite its increased flow resistance is well flowed through, because the air supply due to the air guide, in particular as a result of the second insulating, lossless is passed into the channels and therefore the fan power is used optimally used to overcome the flow resistance. In this way, therefore, an effective cooling air flow can be generated and thus the most uniform and efficient cooling of the respective adjacent to the channel winding layer or winding layers.

In an advantageous embodiment, a channel between the winding region of the coil and the spool core is arranged, in particular so that the associated hollow part touches the spool core, and / or the hollow part of another channel is surrounded by the winding region. The advantage here is that also heat of the coil core can be transported away via a channel and the coil winding is thus warmed on its inside and in its central region. Thus, a particularly uniform temperature distribution can be achieved.

In an advantageous embodiment, the coil is used as a throttle and / or in a filter assembly comprising at least one capacitor used. The advantage here is that high currents and power through the coil are feasible, since it has an effective cooling.

In an advantageous embodiment of the coil core is designed as a laminated core and / or has legs which are connected at their respective end portions with a respective yoke, in particular wherein the coil core is formed rectangular. The advantage here is that a modular design is achieved, so that with a few stocked types of parts a high variance of coil cores is easy to produce.

In an advantageous embodiment, an air-conducting means connected to the housing of the fan touches the second insulating means, in particular so that an otherwise closed flow channel leading from the fan to the channels in the winding area is formed by the fan to the channels in the winding area. The advantage here is that little flow losses occur and thus an effective cooling is achievable.

In an advantageous embodiment, the second insulating means is held at its end remote from the first insulating and / or the coil end forming and / or guided by a holding part and / or towards the second insulating bent-up tabs of a stamped and bent part, in particular foot part,
in particular, wherein the coil core is held by the stamped and bent part, in particular screw-connected to the stamped and bent part. The advantage here is that the outstanding area is held shaping in a simple and cost-effective manner. Thus, as a second insulating means, a less rigid material can be used, such as insulating paper or the like. When occurring in the associated electrical device Rüttelschwingungen sufficient stabilization is achievable, since the second insulating means connected at its first edge region with the first insulating means, in particular glued, and is stabilized and / or held at its second edge region of the bent-up tabs of the stamped and bent part.

In an advantageous embodiment, the arrangement comprises at least a second coil, in particular identically constructed coil, wherein the second insulating means both coils overlapping the respective first insulating means for supplying the cooling air flow to the arranged in the winding regions of the coils channels. The advantage here is that no additional part must be kept in stock for the production but the same second insulating agent is used as in the first coil.

Important features of the inverter are that of the emerging from the channels air flow is directed by a channel to the environment, which is limited by a housing wall and a Luftableitmittel. The advantage here is that an effective cooling is easily achievable.

In an advantageous embodiment of the power electronics of the inverter heated air is supplied through a channel of the environment, which is at least partially limited by Luftableitmittel. The advantage here is that the two hot air, so exhaust air, channels are directly adjacent to each other can be arranged.

In an advantageous embodiment, the arrangement in the axial direction, so Spulenachsrichtung, axially held on both sides. The advantage here is that an improved mechanical stabilization, in particular against Rüttelschwingungen, can be achieved. In addition, heat from the bobbin on both sides can be dissipated, so at the lower edge of the foot plate and at its upper edge to a further with the housing part and heat-conducting connected holding part.

In an advantageous embodiment, the coil assembly is connected to a stamped and bent part and held by this, wherein upturned tabs of the stamped and bent part shape holding the second insulating means,
in particular wherein at least one holding part is provided for further shaping holding the second insulating means, in particular wherein this holding part is fixed to the stamped and bent part. The advantage here is that the punched-bent part on the one hand has the holding function for the spool core and thus also for the entire coil. In addition, the stamped and bent part predetermines the shape for the lower edge of the second insulating means.

The coil is castable, so that coil winding, first and second insulating means with the casting agent, in particular a casting resin, are impregnated and thus stabilized. In addition, hereby seals are produced. In particular, in this way between the second insulating means and stamped and bent part an airtight connection can be produced, since without the casting only a contact between stamped and bent part made of steel and second insulating material made of insulating paper can be achieved.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or posing by comparison with the prior art task.

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

In the 1 an oblique view of the coil according to the invention is shown.

In the 2 is shown an oblique view through a longitudinally cut coil.

In the 3 is an oblique view through a cross-sectioned coil shown.

In the 4 is a trimmed inverter with built-in coils shown.

In the 5 is the trimmed inverter with surrounded by housing parts coils.

In the 6 is shown a cross section through the inverter.

In the 7 is an oblique view is shown on the bottom of the inverter, so that the upturned tabs 70 it can be seen which forms the second insulating agent 2 touch.

In the 8th the scheme of the heat dissipation of the inverter according to the invention is shown, wherein all parts are only schematically sketched.

As in 8th Shown in the housing of the inverter is a fan 62 arranged, whereby a cooling air flow by means of further guidance through a hood-like air guide 40 channels 10 a coil is supplied. The channels 10 are in the winding area 22 the coil are spaced from each other, in particular wherein some of the channels are regularly spaced from each other.

Thus, the cooling air flow occurs from the fan 62 turned off end portion of the coil and is through a Luftableitkanal 60 discharged into the environment.

In the now further described 1 to 7 a concrete embodiment of an inverter and the coil arrangement provided therein is shown.

The coil is an example of a throttle, such as actuator throttle and / or filter inductance.

The core of the coil is made of yoke parts ( 20 . 23 ) and leg parts 21 assembled between the yoke parts 20 and 23 are arranged.

The spool core, in particular its lower yoke part 23 is screw-connected with a foot part 1 , which thus acts as a lower holding part.

The upper yoke part 20 is screw connected by means of the screw connection 6 with a holding plate 7 , which in turn is connected to the housing of the inverter and thus supports the spool core at the upper end region. Thus, increased stability against mechanical vibrations can be achieved.

The bobbin is surrounded and wrapped by the winding 22 , their electrical connection cables as busbars 8th are led out of the coil. The busbars 8th lead to the other components of the power electronics of the inverter.

When winding the winding 22 The coil is inserted hollow parts and then wrapped, so that axially extending channels 10 arise, which serve to perform a cooling medium, such as air. The channels are preferably equally spaced in the circumferential direction.

At its outer periphery is a first insulating means 5 arranged, in particular, is the winding 22 with insulating paper 5 wrapped, for electrical insulation. The first insulating ends in the axial direction at the edge 3 ,

Preferably, a mineral fiber paper is used as insulating paper.

A second insulating agent 2 , in particular the same insulating paper, has an overlap with the first insulating means and extends in the axial direction to the edge 4 , The overlap thus extends from the edge 4 to the edge 3 ,

The second insulating agent 2 thus extends in the axial direction of the winding 22 covered axial area out in the direction of the foot part. Thus, so the second insulating means protrudes 2 over the axial region of the coil winding 22 out.

For shaping is a holding part 11 at the foot part 1 screwed, thus creating the second insulating 2 even around the coil and an equally constructed, adjacent coil is guided around. The coils are directly adjacent, so that the air flow can not escape into the space between the two coils.

The projecting portion of the second insulating is formed by tabs formed on the foot, in particular upwardly bent tabs 70 achieved a further shaping guide for the second insulating means. Preferably, this is the foot part 1 executed as a punched and bent part.

The protruding portion of the second insulating means 2 forms an airlubber. Because together with the lube 40 is a limitation for the fan 62 created airflow created. Here is the case of the fan 62 , ie the outer air limitation of the fan 62 , with the airlubber 40 connected, as in 6 shown.

The coil winding is soaked in the production of the coil with a casting resin, which hardens. This casting resin not only improves the mechanical stability, in particular the fixing of the coil winding 22 but also improves the electrical insulation. Likewise, in the coil winding between the winding layers of the coil winding 22 arranged and arranged on the outer surface of the coil first insulating means 5 mechanically stabilized, in particular stiffer.

Likewise, this is at least partially via the first insulating means 5 axially superior second insulating means 2 solidified with the casting resin, in particular stiffened. In addition, by means of the casting resin and / or an adhesive or filler, a substantially tight connection between the second insulating 2 and foot part 1 reachable. The word "tight" here refers to the tightness of the cooling air flow generated by the fan, so that only insignificant proportions of the cooling air flow between the foot part 1 and second insulator 2 emerge in the space surrounding the coil in the inverter.

The one from the fan 62 generated airflow is thus in the channels 10 guided and thus by the winding area of the winding 22 , At the other axial mouth region of the channels 10 The air stream flows out and is only through the partition 51 and housing parts of the inverter limited. The air flow is then through one of a housing wall 41 and an air outlet plate 50 formed Luftableitkanal 60 led out into the environment.

The inverter also has signal electronics 65 for generating pulse-width-modulated drive signals for controllable power semiconductor switches of a power electronics 66 of the inverter. The of the power electronics 66 generated heat is conducted via a heat sink to an air stream in the air duct 67 is guided, at least partially by the Luftableitblech 50 is limited. Thus, the air flow and the m Luftableitkanal 60 guided airflow directly adjacent and only via the Luftableitblech 50 spaced apart. Since the temperature difference between the two adjacent air streams is small, no significant heat flow between the two air streams is effected.

However, the number of parts is reduced because the Luftableitblech 50 can be used as the respective air flow limiting means.

In the inverter, especially in the space of the power electronics, is also a filter capacitor 64 , Which is also executable as a capacitor arrangement, arranged, which forms a filter with the coil, in particular with the entire coil arrangement. In this way, loads on the network can be reduced by harmonics generated by the converter and / or high-frequency interference.

In the coil winding and a temperature sensor is arranged, whose connections to the connection means 9 , in particular connector part, are led out of the winding area. Thus, a simple and fast operable connection especially during maintenance or repairs is made.

The channel cross sections are very narrow and elongated executable in the invention. In this case, the narrow direction is substantially radial and the long extension is substantially tangential or directed in the circumferential direction. The radial width a at the center or geometric center of gravity of the channel cross section and the length b in the circumferential direction or tangential direction are selected such that the ratio a / b is between 0.05 and 0.2. In addition, the length b and the radius of the center point or center of gravity are selected such that b / r is between 0.5 and 2.

In a further embodiment of the invention, instead of two more identically constructed coils are directly adjacent can be arranged and the second insulating means 2 around the outer boundary of this coil group can be guided around as an air guide, which in turn formed on the foot, in particular upwardly bent tabs 70 form a further shaping guide for the second insulating means.

In other embodiments of the invention, each channel is in the radial direction 10 also one or more channels 10 assigned, wherein the mutually associated channels are then radially spaced from each other.

LIST OF REFERENCE NUMBERS

1

footboard

2

second insulating agent

3

End edge of the first insulating means

4

End edge of the second insulating means

5

first insulating agent

6

screw

7

Halteblech

8th

conductor rail

9

Connection means, in particular connector part

10

cooling channel

11

holding part

20

yoke

21

leg part

22

winding

23

yoke

40

air guide

41

housing wall

50

Luftableitblech

51

partition

60

exhaust path

61

holding part

62

Fan

64

filter capacitor

65

signal electronics

66

power electronics

67

air duct

70

raised lugs

Claims (15)

Arrangement for cooling a coil, which has a coil arranged on a coil core, wherein the arrangement comprises a coil, a fan and at least one air guide, characterized in that in the winding region of the coil channels are arranged, wherein the air flow generated by the fan at least partially by means the air guide is passed into the channels. Arrangement according to at least one of the preceding claims, characterized in that the coil winding is surrounded by a first insulating means, in particular insulating paper, in particular mineral fiber paper, wherein a second insulating means is disposed overlapping with the first insulating means which projects beyond the axial region covered by the coil winding and functions as an air guiding means, in particular so that an air flow generated by the fan is supplied to the channels. Arrangement according to at least one of the preceding claims, characterized in that the first and second insulating means are made of the same material. Arrangement according to at least one of the preceding claims, characterized in that channels are equally spaced in the circumferential direction, in particular three, four, five or more channels are arranged on one, in particular the same, radial distance. Arrangement according to at least one of the preceding claims, characterized in that the channels are formed by means of respective hollow parts, which are provided in Windlungsberiech, in particular wound. Arrangement according to at least one of the preceding claims, characterized in that the channels and / or the hollow parts are each formed cuboid and / or that the channels and / or the hollow parts are each formed sickle-shaped, wherein the sickle extends in the circumferential direction, in particular wherein the Sickle has a substantially constant radial extent, and / or that the radial width a at the center or geometric center of gravity of a channel cross-section and the length b in the circumferential direction or tangential direction are chosen such that the ratio a / b is between 0.05 and 0.2, and / or that the length b and the radius r of the center or center of gravity are selected such that b / r is between 0.5 and 2, and / or that a channel between the winding region of the coil and the spool core is arranged, in particular so that the associated hollow part touches the spool core, and / or the hollow part of another channel is surrounded by the winding region. Arrangement according to at least one of the preceding claims, characterized in that the coil is used as a throttle and / or in a filter assembly comprising at least one capacitor is used. Arrangement according to at least one of the preceding claims, characterized in that the coil core is designed as a laminated core and / or legs, which are connected at their respective end regions with a respective yoke, in particular wherein the coil core is formed rectangular. Arrangement according to at least one of the preceding claims, characterized in that a connected to the housing of the fan air guiding means touches the second insulating means, in particular so that a leading from the fan to the channels in the winding area, otherwise closed flow channel is formed by the fan to the channels in the winding area , Arrangement according to at least one of the preceding claims, characterized in that the second insulating means is held and / or guided on its end region facing away from the first insulating means and / or the coil winding and / or guided by a holding part and / or in the direction of the second insulating means bent-over tabs of a stamped and bent part, in particular a foot part, in particular, wherein the coil core is held by the stamped and bent part, in particular screw-connected to the stamped and bent part, and / or that Coil winding, first and second insulating means are provided with a cured casting resin, wherein between the second insulating agent and foot the casting resin or an adhesive or filler is effected for the cooling air flow generated by the fan substantially airtight seal. Arrangement according to at least one of the preceding claims, characterized in that the arrangement comprises at least a second coil, in particular identically constructed coil, wherein the second insulating means both coils overlapping the respective first insulating means for supplying the cooling air flow to the arranged in the winding regions of the coils Channels. Converter with an arrangement according to at least one of the preceding claims, characterized in that the air flow exiting from the channels is conducted by means of a channel to the environment, which is bounded by a housing wall and a Luftableitmittel. Converter according to at least one of the preceding claims, characterized in that the heated by the power electronics of the inverter air is supplied through a channel of the environment, which is at least partially limited by Luftableitmittel. Converter according to at least one of the preceding claims, characterized in that the arrangement in the axial direction, so Spulenachsrichtung, axially held on both sides. Converter according to at least one of the preceding claims, characterized in that the coil assembly is connected to and held by a stamped and bent part, wherein upturned tabs of the stamped and bent part shape the second insulating means, in particular, wherein at least one holding part is provided for further shaping holding the second insulating means, in particular wherein this holding part is fixed to the stamped and bent part.

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