ELECTRIC MOTOR WITH CONNECTING ELEMENT FOR A WINDING OF A STATOR ON A PRINTED CIRCUIT BOARD WITH AT LEAST TWO INSULATION DISPLACEMENT CONTACTS

Abstract

An electric motor includes a rotor and a stator including a stator core and coils. The coils are defined by a winding wire including winding wire ends electrically contacted with a printed circuit board at an end surface through connectors. The connectors each include at least two insulation displacement contacts receiving a winding wire end of a stator winding. Each connector includes a single electrical connection to the printed circuit board. The connector includes a base body with an underside in contact with the printed circuit board. Each of the at least two insulation displacement contacts includes a clamping slot perpendicular to the underside of the base body. The clamping slots are defined by spaced legs extending from the base body, at least two of the spaced legs being resilient.

Claims

1-5. (canceled)

6. An electric motor, comprising: a rotor rotatable about an axis of rotation; a stator including a stator core and coils wound on the stator core, the coils being defined by a winding wire with winding wire ends; connectors; and a printed circuit board including an end surface electrically contacted with the winding wire ends through the connectors; wherein each of the connectors includes at least two insulation displacement contacts accommodating the winding wire ends; each of the connectors includes a single electrical connection to the printed circuit board; each of the connectors includes a base body which, in an assembled state, has an underside in contact with the printed circuit board; each of the at least two insulation displacement contacts includes a clamping slot perpendicular substantially perpendicular to the underside of the base body, and the clamping slots are defined by spaced legs which extend from the base body; and at least two of the spaced legs are resilient.

7. The electric motor according to claim 6, wherein the electrical connection is a solder connection or a single press-fit contact.

8. The electric motor according to claim 6, wherein two of the clamping slots are defined by three of the legs, a middle leg of the three of the legs defining a portion of the at least two insulation displacement contacts.

9. The electric motor according to claim 8, wherein the middle leg of the three of the legs is rigid.

10. The electric motor according to claim 6, wherein the winding ends accommodated in the at least two insulation displacement contacts correspond to a single motor phase.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Example embodiments of the present disclosure are explained in more detail below with reference to the drawings. Similar or similarly acting components are designated in the figures with the same reference signs.

[0012] FIG. 1 is a longitudinal section through a connector with two insulation displacement contacts according to an example embodiment of the present disclosure.

[0013] FIG. 2 is a longitudinal section through a connector with two insulation displacement contacts according to a further example embodiment of the present disclosure.

DETAILED DESCRIPTION

[0014] The connectors 1 shown in FIGS. 1 and 2 have in common that they comprise a single press-fit contact 2 for making electrical contact with a printed circuit board 3, and two insulation displacement contacts 4 for respectively receiving an end portion 5 of a winding wire 6 of a stator of an electric motor.

[0015] The insulation displacement contacts (IDC) 4 have clamping slots 7. A sharp contact in the clamping slots 7 cuts the insulation of the winding wire ends 5 and achieves electrical contacting of the wire core of the winding wire 6.

[0016] Since only one press-fit contact 2 is provided, this results in a much more compact design compared to the use of two separate connectors, each with a press-fit contact. Each clamping slot 7 accommodates only one winding wire end 5. This has the advantage that a defined gap geometry is present before the winding wire end 5 is pressed in. In addition, this results in better contact reliability, which remains even after aging and vibration loading of the connector 1.

[0017] The two end sections 5 contacted in one connector 1 are associated with one phase of the electric motor. Since there is no need for insulation between the contacts, the wire diameter of the winding wires can be increased, thus increasing the current carrying capacity per motor phase.

[0018] As shown in FIG. 1, the connector 1 preferably has a flat base body 8 with two opposite end faces 9, 10. A first end face 10 rests on the printed circuit board 3 over a large area in the state in which it is attached to the printed circuit board 3. The press-fit contact 2 is formed on this first end face 10. The two insulation displacement contacts 4 are arranged on the second end face 9, each of which is formed by two legs 11, 12 extending away from the base body 8. A clamping slot 7 is arranged between each two legs 11,12. The legs 11,12 are all arranged spaced apart from each other. The clamping slot 7 is arranged approximately perpendicular to the surface of the printed circuit board 3 and to the first end face 10 of the base body 8. In each case, one wire is inserted into one insulation displacement contact 4 or clamping slot 7. The direction of insertion is shown schematically by the arrows 13. The legs 11,12 are preferably elastic in order to allow a permanent and stable pressing of the winding wire 6 in the clamping slot 7. The clamping slot 7 has a sharp contact area inside on the surface of the legs, which strips the winding wire 6 when the winding wire 6 is pressed in and passed. The clamping slots 7 have an insertion and press-in chamfer 14.

[0019] FIG. 2 shows a further example embodiment. In contrast to the example embodiment of FIG. 1, only three spaced legs 11,12,13 are arranged on the second end face 9 of the base body 8. The two insulation displacement contacts 4 share the middle leg 13. This middle leg 13, which lies between the two outer legs 11,12 and thus forms two clamping slots 7, is rigidly designed. In order to enable the winding wire ends to be permanently pressed into the clamping slots 7, the two outer legs 11,12 are of resilient design. The clamping slots 7 also have insertion and press-in chamfers 14.

[0020] In a further example embodiment, depending on the application, it may also be provided that the connector has more than two insulation displacement contacts.

[0021] In general, the connector may not have a press-fit contact, but may be soldered directly to the printed circuit board.

[0022] The winding wire is preferably formed of enameled copper wire.

[0023] While example embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.