DE102018003871A1 - Coil with coil core and winding and system for the inductive transmission of electrical energy from a stationarily arranged first coil to a arranged on the underside of a vehicle second coil - Google Patents

Abstract

Coil having a coil core and winding and system for the inductive transmission of electrical energy from a stationary first coil to a second coil arranged on the underside of a vehicle, wherein the coil core has at least two layers, a first of the layers having, in particular, regularly spaced plates, wherein a second one of the layers comprises plates spaced apart from one another in particular, wherein the plates of the second layer are arranged overlapping the plates of the first layer, in particular such that a respective plate of the second layer covers and / or covers the spacing region between in each case two plates of the first layer such that the perpendicular projection of the plates of the second layer into the first layer together with the plates of the first layer results in an uninterrupted surface area.

Description

The invention relates to a coil with coil core and winding and a system for the inductive transmission of electrical energy from a stationarily arranged first coil to a arranged on the underside of a vehicle second coil.

It is well known that a coil has a coil core around which a coil is wound.

From the DE 103 12 284 A1 a system for non-contact energy transfer is known, which has a ferrite with two layers of similar ferrite plates, wherein the ferrite plates are arranged stacked and the stacks are arranged side by side in the layer direction, so that the vertical projection of the ferrite in one of the layers has interruptions.

From the DE 10 2013 018 273 B3 is a secondary part of a system for inductive energy transfer to an electric vehicle known.

From the DE 10 2007 014 712 A1 is known on a filled with ferrite plates surface secondary winding known.

The invention is therefore based on the object to develop a coil, wherein the coil should be compact executable.

According to the invention the object is achieved in the coil according to the features specified in claim 1 and in the system according to the features specified in claim 11.

Important features of the invention in the coil with coil core and winding are that the coil core has at least two layers,
wherein a first of the layers has, in particular, regularly spaced plates from each other,
wherein a second of the layers in particular has regularly spaced plates from each other,
wherein the plates of the second layer are arranged overlapping the plates of the first layer,
in particular so that a respective plate of the second layer covers the spacing region between in each case two plates of the first layer and / or so that the vertical projection of the plates of the second layer into the first layer together with the plates of the first layer results in an uninterrupted surface area.

The advantage here is that the ferrite form a two-layer arrangement, this arrangement has substantially no passage in the normal direction to the layer plane. The ferrite plates thus form a flat coil core. Preferably, the extent of the first and the second ferrite plates in the normal direction is at least five times less than in each of the transverse directions, ie in the arrangements oriented transversely to the normal direction. In the spacing regions of the first layer, conducting regions of a respective turn of the winding are arranged. In the spacing regions of the second layer, return regions of a respective turn of the winding are arranged. Thus, the winding is designed as a Solenoidwicklung executable around a flat coil core. By inserting the winding in the spacing areas a very compact design of the coil is possible. The forward and return lines are each separated by ferrite plates, in particular, each direct connection line between the forward line and the return line of each turn passes through at least one of the respective two ferrite plates. Thus, a compact design is possible.

In an advantageous embodiment of the coil core is made of ferrite, in particular wherein the plates are ferrite plates. The advantage here is that a cost-effective production is possible.

In an advantageous embodiment, the first layer is flat, ie in particular a flat, in particular flat, arrangement of spaced-apart plates. The advantage here is that a flat compact arrangement can be realized and thus only little space for inductive transmission is required between the floor and the vehicle.

In an advantageous embodiment, the second layer is flat, ie in particular a flat, in particular flat, arrangement of spaced-apart plates. The advantage here is that between the bottom of the vehicle and the floor only little space for the inductive transmission is needed.

In an advantageous embodiment, the winding is arranged in the spacing regions between the plates,
in particular, such that the winding wire of the winding is arranged between the plates of the first layer and between the plates of the second layer. The advantage here is that the winding so to speak sunk in the ferrite arrangement can be arranged. In this way, the winding wire is surrounded as far as possible by ferrite and improves the field guidance.

In an advantageous embodiment, the winding is a solenoid winding. The advantage here is that the winding around the flat running coil core is executable around, wherein the winding is inserted into recesses of the coil core, namely the spacing regions between the ferrite plates.

In an advantageous embodiment, a film is arranged between the first layer and the second layer,
wherein the plates of the first layer are adhesively bonded to the foil, in particular are adhesively bonded,
wherein the plates of the second layer are bonded to the film, in particular adhesively bonded. The advantage here is that the mechanical stability is improved, in particular an improved breaking strength can be achieved. Because of the film bending of the arrangement without danger to the individual ferrite plates executable. If the ferrite plates lie directly against each other, an increased risk of breakage would be caused.

In an advantageous embodiment, the film is made of plastic, in particular wherein the film is a laminating film. The advantage here is that a cost-effective production is made possible by the ferrite plates of the first layer are adhesively bonded to the top of the film and the ferrite plates of the second layer are adhesively bonded to the underside.

In an advantageous embodiment, the coil has a magnetic shield,
in particular, wherein the shield is an aluminum plate. The advantage here is that on the side facing away from the winding side of the magnetic shield magnetically conductive material, such as steel or iron, can be arranged without the inductive transmission is disturbed. For the magnetic shield can be arranged on the winding used as the primary winding on the side remote from the secondary winding side of the primary winding or an alternative or additional magnetic shield can be arranged on the winding used as a secondary winding on the side facing away from the primary winding side of the secondary winding.

In an advantageous embodiment, the arrangement formed from the coil core and winding is materially connected by means of potting compound with the magnetic shield. The advantage here is that a mechanically stable arrangement and at the same time sufficient electrical isolation can be achieved.

In an advantageous embodiment, the coil core and the winding are surrounded by potting compound which is at least partially bounded by the magnetic shield. The advantage here is that the shield also acts as a receptacle or at least bottom portion of a receptacle for the potting compound. Thus, a simple production is possible.

Important features of the system for inductive transmission of electrical energy from a stationary first coil to a second coil arranged on the underside of a vehicle are that the first and / or second coil is designed as a coil in the above-mentioned manner.

The advantage here is that an inductive transmission is effectively, especially under stress of a small volume, allows. Because one or both coils of inductive transmission are flat executable and the ground clearance of the bottom of the vehicle is thus low durable. Because the first coil is on the ground and the second coil and the bottom of the vehicle can be arranged.

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 the task posing by comparison with the prior art arise.

• In der 1 ist eine Solenoid-Spule schematisch in Schrägansicht dargestellt.
• In 2 ist eine Schnittansicht durch eine erste erfindungsgemäße Spule dargestellt.
• In der 3 ist eine zweite erfindungsgemäße Spule in Schnittansicht dargestellt.
• In der 4 ist die zweite Spule gebogen dargestellt.

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

• In the 1 a solenoid coil is shown schematically in an oblique view.
• In 2 a sectional view through a first coil according to the invention is shown.
• In the 3 a second coil according to the invention is shown in sectional view.
• In the 4 the second coil is shown bent.

As in 1 As shown, a solenoid coil has a spool core 1 , in particular ferrite core, on which a winding 3 is wound. The coil core 1 and the winding 3 are of potting compound 2 surround.

As in 2 shown in the first coil according to the invention this also designed as a solenoid coil.

However, the core of first and second ferrite plates ( 21 . 22 ).

The first ferrite plates 21 are arranged in a first plane and the second ferrite plates 22 in an upper level. The first and second ferrite plates ( 21 . 22 ) are preferably all carried out the same way.

Within each of the levels are the respective ferrite plates ( 21 . 22 ) spaced apart so that in the by the spacing incurred area the winding 3 is provided. The winding 3 is designed as a solenoid winding, ie around an imaginary winding axis, which is aligned parallel to the planes.

The spaces formed by the spacing form recesses extending transversely to the winding axis. Thus, the laterally extending winding sections of the winding are 3 in the areas between the ferrite plates 22 arranged in the upper plane and extending counter to the transverse direction winding sections of the winding 3 between the ferrite plates 21 the first level arranged.

Each of the areas between the first ferrite plates 21 is of at least one of the second ferrite plates 22 covered and / or limited.

As in 2 is thus shown an overlapping arrangement of the second ferrite plates 22 to the first ferrite plates 21 advantageous.

The entire arrangement of the first and second ferrite plates is on a metallic shield 20 arranged, which is preferably designed as an aluminum plate. Further preferably, the arrangement is encapsulated with potting compound and thus ensures a cohesive and / or positive cohesion of the arrangement.

As in 3 and or 4 A reduction in the risk of breakage can be achieved by using a film 30 between the first and second plane, ie between the first and second ferrite plates ( 21 . 22 ), the ferrite plates ( 21 . 22 ) with the film by means of adhesive 31 connected is.

This is the foil 30 preferably designed as a plastic film and on the top and at the bottom of each regularly spaced adhesive joints 31 a respective ferrite plate ( 21 . 22 ) glued.

The arrangement is in turn arranged on a metallic screen, in particular aluminum sheet.

4 shows in contrast to 3 schematically how a curvature load is absorbed.

As a result of the slide 30 an adaptation to a curvature is absorbable. Because the ferrite plates 21 and 22 do not touch each other directly but are through the foil 30 including glue 31 spaced. In this way, the risk of breakage for ferrite plates 21 and 22 reduced.

In addition, the coil with potting compound 2 shed.

The ferrite plates 21 the first layer and the ferrite plates 22 The second layer are preferably all carried out the same way and the arrangement within the respective layer also similar. The way of the ferrite plates 21 The one-dimensional grid formed in the first layer has the same lattice constant as that of the second ferrite plates 22 formed one-dimensional grid. The two grids, that is the arrangement of the first ferrite plates 21 and the arrangement of the second ferrite plates 22 have an offset to each other in the grid direction. The offset is such that the second ferrite plates 22 each the spacing region between the first ferrite plates 21 seen from the transverse direction to the grid direction, so seen from the normal direction, cover.

The arrangement of the second ferrite plates 22 Thus, parallel to the layer direction has the offset to the arrangement of the first ferrite plates 21 on.

Thus, the vertical projection of both arrangements of ferrite plates ( 21 . 22 ) on the slide 30 the foil 30 gapless, especially excluding the outer edge of the film 30 ,

The inventive coil according to one of the figures is provided on the underside of a vehicle, so that inductively energy can be transmitted to the vehicle and an energy store can be charged, from which the electromotive traction motor of the vehicle can be supplied.

Additionally or alternatively, the coil can be arranged on the ground, ie in particular stationary. In this case, the coil is supplied with an alternating current, in particular with a frequency between 10 and 1000 kHz.

The arranged on the underside of the vehicle coil is a capacity connected in series or in parallel, that the resonant frequency of the resonant circuits thus formed corresponds to the frequency of the impressed in the bottom coil arranged alternating current.

LIST OF REFERENCE NUMBERS

1

Coil core, in particular ferrite core

2

potting compound

3

Winding, in particular secondary winding

20

metallic shielding

21

first ferrite plate

22

second ferrite plate

30

Foil, in particular laminating foil

31

adhesive

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 10312284 A1 [0003]
• DE 102013018273 B3 [0004]
• DE 102007014712 A1 [0005]

Claims (11)

Coil with bobbin and winding, wherein the coil core comprises at least two layers, a first of said layers, in particular regularly, having from one another, spaced plates, wherein a second of the layers from one another, in particular regularly spaced plates, characterized in that the plates of the first Layer having a directionally offset to the plates of the second layer such that the plates of the second layer are arranged overlapping the plates of the first layer, in particular so that a respective plate of the second layer, the spacing region between each two plates of the first layer covered and / or so that the vertical projection of the plates of the second layer in the first layer together with the plates of the first layer results in an uninterrupted surface area. Coil according to at least one of the preceding claims, characterized in that the coil core is made of ferrite, in particular wherein the plates are ferrite plates. Coil according to at least one of the preceding claims, characterized in that the first layer is flat, ie in particular a flat, in particular planar, arrangement of spaced-apart plates and / or that the second layer is flat, in particular a flat, in particular flat, Arrangement of spaced plates. Coil according to at least one of the preceding claims, characterized in that the winding is arranged in the spacing regions between the plates, in particular so that the winding wire of the winding is arranged between the plates of the first layer and between the plates of the second layer. Coil according to at least one of the preceding claims, characterized in that the winding is a solenoid winding. Coil according to at least one of the preceding claims, characterized in that a foil is arranged between the first layer and the second layer, wherein the plates of the first layer of the film are firmly bonded, in particular adhesive, wherein the plates of the second layer with the Foil are materially connected, in particular adhesively bonded. Coil according to at least one of the preceding claims, characterized in that the vertical projection of the plates of the first and the second layer on the film, the film completely covers, in particular except the outer edge of the film. Coil according to at least one of the preceding claims, characterized in that the film is made of plastic, in particular wherein the film is a laminating film. Coil according to at least one of the preceding claims, characterized in that the coil has a magnetic shield, in particular wherein the shield is an aluminum plate. Coil according to at least one of the preceding claims, characterized in that the arrangement formed from coil core and winding is integrally connected by means of potting compound with the magnetic shield and / or that the coil core and winding are surrounded by potting compound, which is at least partially limited by the magnetic shield. System for the inductive transmission of electrical energy from a stationarily arranged first coil to a arranged on the underside of a vehicle second coil, characterized in that the first and / or second coil is designed as a coil according to at least one of the preceding claims.

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