DE102016121856A1 - stator - Google Patents

Abstract

The invention relates to a stator (10), which is provided in particular for a mains-operated EC motor (50), having a stator body (12) on which a plurality of stator windings (18) are accommodated, and having at least one printed circuit board (30). at an axial end for interconnecting the stator windings (18), wherein insulation displacement contacts (20) are provided for contacting the stator windings (18). ()

Description

The invention relates to a stator, in particular for a mains-powered EC motor, having a stator body, on which a plurality of stator windings is accommodated, and having at least one printed circuit board at an axial end for interconnecting the stator windings.

Such a stator is out of the DE 10 2010 056 120 A1 known.

In the known stator, an electronic circuit board or board is provided, by means of which the various windings of the stator are interconnected. For this purpose, the windings are soldered with their ends to contact tongues, which are fixed on the board.

Overall, the interconnection of the stator is much easier in this way.

However, the attachment of contact tongues on the board and the soldering of the stator windings with the contact tongues has proven to be relatively expensive.

Against this background, the invention has for its object to provide a stator for an electric motor, in which the stator windings are interconnected in the simplest and most reliable manner. Furthermore, a method for producing such a stator is to be disclosed.

This object is achieved in a stator according to the aforementioned type according to the invention in that insulation displacement contacts are provided for contacting the stator windings.

The task is solved in this way.

Through the use of insulation displacement contacts a very fast and inexpensive contacting of the stator windings is possible. On soldering or welding operations for contacting the stator windings can be dispensed with in this way, whereby the assembly is significantly simplified.

According to a further embodiment of the invention, solder insulation displacement contacts are used instead of the press-in insulation displacement contacts, which make the electrical contact with the wiring board and its mechanical fixation. In contrast to press-in insulation displacement contacts, the electrical contacting is additionally ensured by soldering, for which solder tails may be provided.

In a preferred embodiment of the invention, the board is mechanically fixed to the stator body by means of the insulation displacement contacts.

In this way, an additional attachment of the board on the stator, such as by a screw, superfluous.

According to a further embodiment of the invention, each insulation displacement contact at one end at least one press-in contact for pressing into a bore of the board and at the other end a clamping portion with clamping tongues for contacting a winding wire.

In this way, the contacting of the insulation displacement contact on the one hand with the board and on the other hand with an associated winding wire can be realized in a simple and cost-effective manner.

According to a further embodiment of the invention, the board has a plurality of holes, in which engage the insulation displacement contacts with their press-in contacts, each hole on the board is surrounded by a contact pad, which is contacted by associated press-fit.

In this way, a simple and reliable contact between the insulation displacement contacts and the board is made possible.

According to a further embodiment of the invention, the board is formed in multiple layers and adjacent layers have contact pads which are contacted by through holes, which are designed as electrically conductive copper sleeves, and / or with an electrically conductive material, in particular copper or silver , are filled.

In this way, by the contact pads in conjunction with the additional through holes, which are filled with a highly conductive material, the cross-section, which is available for the power line, significantly increased. By means of the through-plated holes, which are also referred to as vias, many parallel and very low-impedance current paths are formed which connect all the layers within a contact pad and have the same electrical potential.

If only one press-in contact is used in conjunction with a contact pad on the board, then the rectangular shape of the press-fit contact generally does not guarantee a full-surface electrical connection within the contact pad. Also in the cross-sectional view, some copper layers are better contacted than others. The metallized wall thickness a contact pad is about 25 microns of copper, ie in the worst case, the 25 micron wall thickness would have to transport the entire stream between press-fit and further conductive trace on the board. The use of vias explained above avoids this problem and, overall, enables a very low-resistance connection between the press-fit contacts and the further conductor tracks on the board.

According to a further embodiment of the invention, the stator has a stator body with a basic insulation.

Such an embodiment is preferred when the stator is used for a mains powered EC motor.

• - Bereitstellen eines Statorkörpers mit einem Blechpaket;
• - Umspritzen des Blechpaketes mit einer Isolierung und Ausbilden von Tragkörpern;
• - Wickeln von Statorwicklungen auf die Tragkörper, vorzugsweise in einem durchgehenden Arbeitsgang;
• - Fixieren von Schneidklemmkontakten in der Isolierung und Aufpressen von Kontaktzungen der Schneidklemmkontakte auf zugeordnete Drähte der Statorwicklungen, um diese zu kontaktieren;
• - Trennen der Statorwicklungen an vorbestimmten Stellen und Abschneiden von überstehenden Drähten;
• - Fügen einer Platine mit Bohrungen auf zugeordnete Einpresskontakte der Schneidklemmkontakte, um diese zu kontaktieren und die Platine mechanisch zu befestigen.

The object of the invention is further achieved by a method for producing a stator, in particular for a mains-powered EC motor, with the following steps:

• - Providing a stator body with a laminated core;
• - Injection of the laminated core with an insulation and forming of supporting bodies;
• - Winding of stator windings on the support body, preferably in a continuous operation;
• - Fixing insulation displacement contacts in the insulation and pressing of contact tongues of the insulation displacement contacts on associated wires of the stator windings to contact them;
• - Separating the stator windings at predetermined locations and cutting off protruding wires;
• - Add a board with holes on associated press-in contacts of the insulation displacement contacts to contact them and mechanically secure the board.

With such a method, a simple and inexpensive production of a stator is made possible. The windings can be continuously wound and contacted in a simple and cost-effective manner via an associated board by clamping. By pressing in the contact tongues of the insulation displacement contacts, the insulation is exposed on the respective wires and made the contact.

In an additional development of the method, contact islands are provided on the circuit board in the region of the bores for receiving the press-fit contacts, which are contacted by the press-in contacts during the joining of the circuit board.

According to a further embodiment of the invention, a multilayer board is used in which adjacent layers have contact islands which are contacted with one another via through bores which are filled with conductive material, in particular copper or silver.

In this way, a very low-resistance connection between the press-in contacts and the continuing conductor tracks of the board is ensured.

It is understood that the features of the invention mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the invention.

• 1 eine perspektivische Darstellung eines erfindungsgemäßen Stators, von schräg oben gesehen;
• 2 eine Seitenansicht des Stators gemäß 1;
• 3 einen Längsschnitt durch den Stator gemäß 2 in einer Schnittebene, bei der lediglich ein äußerer Teil der Isolierung abgeschnitten ist, so dass ein Schneidklemmkontakt, der in der Isolierung gehalten ist, freigelegt ist;
• 4 einen vergrößerten Schnitt durch die Platine mit einem zugeordneten Schneidklemmkontakt, wobei an der Oberseite der vierlagigen Platine zusätzlich Vias vorgesehen sind;
• 5-8 Draufsichten auf die verschiedenen Einzellagen der Platine und
• 9 eine vereinfachte schematische Darstellung eines netzbetriebenen EC-Motors mit dem erfindungsgemäßen Stator.

Further feature and advantages of the invention will become apparent from the following description with reference to the drawing. Show it:

• 1 a perspective view of a stator according to the invention, seen from obliquely above;
• 2 a side view of the stator according to 1 ;
• 3 a longitudinal section through the stator according to 2 in a sectional plane in which only an outer part of the insulation is cut off, so that an insulation displacement contact, which is held in the insulation, is exposed;
• 4 an enlarged section through the board with an associated insulation displacement contact, wherein at the top of the four-layer board vias are additionally provided;
• 5 - 8th Top views of the various individual layers of the board and
• 9 a simplified schematic representation of a mains operated EC motor with the stator according to the invention.

In 1 a stator according to the invention is shown in a perspective view obliquely from above and in total with the numeral 10 designated.

The stator 10 has a stator body 12 with a laminated core 14 on, by means of an electrical insulation, which is indicated in total with 15, base insulated and completely encapsulated. Here are support body 16 for receiving stator windings 18 formed as part of the electrical insulation.

On the support bodies 16 are stator windings 18 wound.

For interconnection of the stator windings 18 is a four-layer board 30 provided at one axial end of the stator 10 is included. Held in the electrical insulation is a series of insulation displacement contacts 20 , each in associated holes 32 (see also 3 ) of the board 30 protruding from below. Exemplary are in 1 and 3 two press-fit contacts 26 . 28 referred to in the holes 32 along the outer circumference of the board 30 protruding from below. The board 30 is through the press-fit contacts 26 . 28 also mechanically on the insulation displacement contacts 20 held.

How out 3 can be seen, have the insulation displacement contacts on their press-in contacts 26 . 28 opposite side in each case a clamping portion 22 with two clamping tongues 23 . 24 on.

The clamping tongues 23 . 24 each close a winding wire 34 one. The winding wire 34 is by pushing on the clamping tongues 23 . 24 Scraped on its surface, so that the paint insulation exposed and an electrical contact with the insulation displacement contact 20 is made.

The board 30 is formed as a four-layer board and consists of the four individual layers, which in the 5 to 8th are shown by way of example and with the numbers 36 . 38 . 40 . 42 are designated. On each individual layer a plurality of interconnects are arranged for interconnection, here only by way of example with the numbers 37 . 39 . 41 . 43 are designated.

The individual layers 36 . 38 . 40 . 42 are arranged one above the other parallel to one another and each have contact islands on their outer circumference 44 . 46 . 48 . 50 on, which are aligned with each other. In each of the contact islands 44 . 46 . 48 . 50 are two through holes 32 provided, extending through all individual layers 36 . 40 . 42 . 44 extend and to receive the press-fit 26 . 28 are formed. Each of the holes 32 is from a contact pad 44 . 46 . 48 . 50 on every single layer 36 . 38 . 40 . 42 surround.

To a very good power line through a low-resistance contact in each case between the press-fit 26 . 28 and the tracks of the board 30 to ensure are in addition to the holes 32 for the press-fit contacts 26 . 28 on every contact island 44 . 46 . 48 . 50 every single layer 36 . 38 . 40 . 42 even more holes 52 intended. These holes 52 extend through all individual layers 36 . 38 . 40 . 42 and are designed as electrically conductive copper sleeves, which can also be filled with an electrically conductive material, preferably copper, as exemplified in 4 with the numeral 54 is designated. The holes 52 made with electrically conductive material 54 filled are also called vias.

On each of the overlapping contact islands 44 . 46 . 48 . 50 a plurality of vias 52 . 54 are provided, many parallel and very low impedance current paths, which arise within the contact islands 44 . 46 . 48 . 50 connect the individual layers together and thus a low-resistance contact with the press-in contacts 26 . 28 produce.

For the production of the stator 10 the procedure is as follows:

First, the laminated core 14 prepared and then by injection molding with the insulation 15 Mistake. Here are the support body 16 for the stator windings 18 formed. After encapsulation of the laminated core 14 become the stator windings 18 preferably continuously on the support body 16 wound. Subsequently, the insulation displacement contacts 20 pressed from the outside at the intended locations in the insulation and at the same time the clamping tongues 23 . 24 the insulation displacement contacts 20 on assigned wires 34 the stator windings 18 pressed so that an electrical contact is made. The stator windings 18 are now separated at predetermined locations and cut off protruding wires.

Subsequently, the board 30 with the holes 32 on the assigned press-fit contacts 26 . 28 the insulation displacement contacts 20 pressed from above. Thus, the contact with the insulation displacement contacts 20 produced and at the same time the board 30 mechanically fastened. Alternatively, solder insulation displacement contacts can be used, which additionally have solder tails, by means of which they are soldered (not shown).

Such a stator is preferably used to make a mains powered EC motor.

Such an EC motor is greatly simplified in 9 represented and in total with the numeral 60 designated. The EC engine 60 has a stator 10 of the type described above. Inside the stator 10 is a rotor 62 rotatably mounted. A control circuit 64 serves to control the stator 10 to create a circulating magnetic field. By way of example, here are only three connecting lines 66 represented the control 64 with the stator 10 connect.

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 102010056120 A1 [0002]

Claims (12)

Stator, in particular for a mains-powered EC motor (50), having a stator body (12) on which a plurality of stator windings (18) is accommodated, and having at least one printed circuit board (30) at one axial end for connecting the stator windings (18 ), characterized in that insulation displacement contacts (20) for contacting the stator windings (18) are provided. Stator after Claim 1 , characterized in that the circuit board (30) on the stator body (12) by means of the insulation displacement contacts (20) is mechanically fixed. Stator after Claim 1 or 2 , characterized in that each insulation displacement contact (20) at one end at least one press-in contact (26, 28) for pressing into a bore (32) of the board (30) and at the other end a clamping portion (22) with clamping tongues (23, 24) For contacting a winding wire (34). Stator according to one of the preceding claims, that the board (30) has a plurality of bores (32), in which the insulation displacement contacts (20) engage with their Einpresskontakten (26, 28), wherein each bore (32) on the board (30 ) is surrounded by a contact pad (44) which is contacted by the associated press-in contact (26, 28). Stator according to one of the preceding claims, characterized in that the circuit board (30) is formed in multiple layers, and that adjacent layers contact islands (36, 38, 40, 42, 44, 46, 48, 50) which via through holes (52 ) are contacted with each other, which are designed as electrically conductive copper sleeves, and / or which are filled with an electrically conductive material (54), in particular copper or silver. Stator according to one of the preceding claims, characterized in that the stator (10) has a stator body (12) with a base insulation (15). Stator according to one of the preceding claims, characterized in that the insulation displacement contacts (20) are designed for soldering, for which purpose solder tails are preferably provided. Motor, in particular mains-operated EC motor, with a stator (10) according to one of the preceding claims. Method for producing a stator, in particular for a mains-powered EC motor, comprising the following steps: - Providing a stator body (12) with a laminated core (14); - Overmolding of the laminated core (14) with an insulation (15) and forming support bodies (16); - Winding of stator windings (18) on the support body (16), preferably in a continuous operation; - Fixing of insulation displacement contacts (20) in the insulation (15) and pressing of contact tongues (23, 24) of the insulation displacement contacts (20) on associated wires (34) of the stator windings (18) to contact them; - Separating the stator windings (18) at predetermined locations and cutting off protruding wires; - Adding a board (30) with holes (32) on associated press-in contacts (26, 28) of the insulation displacement contacts (20) to contact them and mechanically secure the board (30). Method according to Claim 9 in which the insulation displacement contacts (20) are additionally soldered. Method according to Claim 9 or 10 in which contact islands (44, 46, 48, 50) are provided on the printed circuit board (30) in the region of the bores (32) for receiving the press-fit contacts (26, 28), which contact pins (30) via the press-fit contacts (30). 26, 28) are contacted. Method according to Claim 9 . 10 or 11 in which a multi-layer board (30) is used, in which adjacent layers (36, 38, 40, 42) contact islands, which are contacted by through holes (52) which are designed as electrically conductive copper sleeves, and / or which are filled with electrically conductive material (54), in particular copper or silver.

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