CN111525721A

CN111525721A - Stator for EC motor

Info

Publication number: CN111525721A
Application number: CN202010079700.XA
Authority: CN
Inventors: J.T.乔蒂; D.索莱萨尼; R.科克; T.比尔坎
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2019-02-05
Filing date: 2020-02-04
Publication date: 2020-08-11
Also published as: DE102019201418A1

Abstract

A stator for an EC motor has a wiring mechanism supported on a stator body of the stator and including a plurality of electric conductor elements supported on the stator body or a member connected to the stator body independently of each other.

Description

Stator for EC motor

Technical Field

The present invention relates to a stator for an EC motor having a wiring mechanism for connecting a stator coil with a controller.

Background

DE 102015200095 Al discloses a stator for an electric machine, wherein the stator has a stator body with radial stator teeth, which are the supports for the windings. The different windings are controlled by a connection board, by means of which a connection to a controller is established. The connecting plate comprises a plurality of circumferentially distributed electrically conductive conductor elements which are held on an annular plastic carrier, wherein the plastic carrier is placed on the end face of the stator.

An axially extending connection plug is formed integrally with the conductor element, by means of which connection plug the connection to the control unit is made possible. The connecting plug has a crosspiece which rests against an axial stop of the retaining element on an annular plastic support. This ensures that no axial forces are transmitted to the windings of the stator via the connecting plug and the conductor elements when the controller is connected.

Disclosure of Invention

The stator according to the invention can be used in an electronically commutated electric motor (EC motor) and has a wiring mechanism for connecting the stator coils in the stator to a controller. The wiring arrangement comprises a plurality of electrical conductor elements which are connected at one end to the stator coils and at the other end to a controller for actuating the stator coils. The wiring arrangement has a plurality of such conductor elements distributed over the circumference, for example three conductor elements, which are formed independently of one another. The conductor elements can be formed identically to one another. The conductor elements are arranged in particular distributed uniformly over the circumference. For example, there are three conductor elements.

The electrical conductor elements are arranged individually and independently of one another in the wiring arrangement, they are not arranged in a circumferential support ring. In contrast, the electrical conductor elements are supported independently of one another on the stator body of the stator or on a component connected to the stator body. The stator body has in particular a cylindrical shape.

This embodiment has various advantages. Due to the separation of the electrical conductor elements, no annular wiring arrangement is required, which forms a continuous structural unit that is closed in itself. The conductor elements are rather individually present and are arranged individually on the stator body or on a component connected to the stator body and connected thereto. This procedure not only simplifies the production of the wiring arrangement but also the assembly of the conductor elements when connecting to the stator body of the stator. The conductor elements can be arranged individually and in a precise manner on the stator and connected to the stator coils. Overall, there is a high potential for cost savings with simple assembly.

The electrical conductor element is preferably fixed to the stator body. For this purpose, fastening hooks can be formed on the conductor elements, which fastening hooks are fastened to the end face of the stator body.

The stator body is composed in particular of a plurality of individual laminations stacked one above the other, on which stator teeth for receiving stator coils can be formed. The wiring mechanism is on an end side of the stator body.

According to an advantageous embodiment, the conductor element is supported on the stator body or on a component connected to the stator body by means of a support. In particular exactly one support is assigned to each conductor element. The support is fixed to the stator body or to a component connected to the stator body and is advantageously made of a non-conductive material, in particular constructed as a plastic component. The support supports the precise positioning of the conductor elements on the stator. Furthermore, the support can support and absorb forces which act on the conductor element in the axial direction, in particular axially from the outside to the inside, and which may occur, for example, when connecting the conductor element to a control unit. The axial force is guided via an axial connecting plug of the conductor element, which is connected to the control unit, to the support and from there further to the stator body or to a component connected to the stator body. This procedure ensures that the axial forces occurring when the control unit is connected are transmitted only to the components of the stator that can be supported, in particular to the stator body or to components arranged directly on the stator body, preferably the bearing caps arranged on the end faces of the stator body. The rotor of the electric machine passes through the bearing cap, on which the rotor is supported in a rotating manner. The support ensures that the stator coils are not subjected to axial forces.

The support on the stator body or on the component connected to the stator body is in particular supported axially from the outside to the inside, so that correspondingly axial forces occurring when the control device is installed and connected to the conductor element are also guided axially via the support to the stator body or the component connected to the stator body.

The axial connecting plug of the electrical conductor element is guided in particular by the support. The axial connection plug extends in the axial direction and preferably passes through an opening in the support. A support shoulder can be formed on the axial connector pin, which support shoulder is supported on a support element. The support shoulder ensures that axial forces acting on the connecting plug from the outside are guided to the support and further to the stator body or to a component connected to the stator body. The support shoulder is formed in particular integrally with the axial connecting plug of the conductor element.

An opening is advantageously introduced into the support for receiving an axial connecting plug of the conductor element. During assembly, the axial connecting plug is passed through an opening in the support part, wherein the opening is optionally designed in an elastically expandable manner in order to be able to pass the widened support shoulder through the opening. The opening is then closed again, in particular due to the inherent elasticity of the support, so that a support shoulder formed on the axial connector plug can be supported on the support in the axial direction.

According to a further advantageous embodiment, the electrical conductor element is supported on a bearing cap which is arranged at the end on the stator body for receiving and supporting the rotor. The conductor element is supported on a support, which is in particular fixed on the bearing cap. For this purpose, lateral fastening pins can be provided on the support, which pins project into the associated recesses for fastening the bearing cap, which recesses are introduced into the bearing cap. The fixing pin, preferably two fixing pins, is in particular located on the side of the opening, which is preferably formed in the manner of a slit.

The support has an inherent elasticity that allows the support to be elastically bent for passing an axial connection plug therethrough, such that the opening is expanded upon passing the axial connection plug therethrough. As the bending moment is eliminated, the free cross section of the opening is reduced again, so that the support shoulder on the axial connector pin of the electrical conductor element can be supported on the outer side of the support.

According to a further advantageous embodiment, the support is designed as a hollow body with a surrounding wall which surrounds the opening in the support. The surrounding wall gives the support a high stability.

The invention further relates to an electronically commutated motor having a stator as described above and having a rotor. The EC motor is in particular designed as an internal rotor motor. The EC motor can be used, for example, as a servomotor in a vehicle.

Drawings

Further advantages and advantageous embodiments can be gathered from the further claims, the description of the figures and the drawings. Wherein:

fig. 1 shows an end face of a stator for an EC-motor, the stator having a wiring mechanism for connecting stator coils in the stator with a controller,

figure 2 shows an electrical conductor element as an integral part of the wiring mechanism,

figure 3 shows the plastic support in a perspective view,

figure 4 shows a cross-section of the plastic support,

fig. 5 shows a bearing cap for a stator together with a total of three plastic supports, which are inserted into the recesses in the bearing cap,

figure 6 shows the bearing cap together with the enclosed support in a view from below,

figure 7 shows a cross section of the bearing cap together with the enclosed plastic support,

fig. 8 shows a perspective view, partially in section, of a stator with an end-side wiring arrangement comprising a sleeved bearing cap.

In the drawings, like components are provided with like reference numerals.

Detailed Description

The stator 1 of an electronically commutated EC electric motor is partially shown in fig. 1. The stator 1 comprises a stator body 2 which is composed of a plurality of individual laminations stacked on top of one another, which on their inner faces form a plurality of stator teeth on which stator coils are wound in a circumferentially distributed manner. The stator coils are actuated by means of a wiring mechanism 3, which connects the stator coils to a controller located axially upstream of the stator 1.

The wiring arrangement 3 comprises a total of three individual conductor elements 4, wherein one conductor element 4 is shown in detail in fig. 2. The conductor element 4 is designed as a one-piece component and is made of an electrically conductive material, in particular an electrically conductive metal, and is designed as a punched-bent component in an exemplary manner.

The conductor element 4 has a circumferential section 5, which extends over a limited angular section of, for example, 30 ° in the circumferential direction on the end face of the stator body 2, and a connection plug 6, which is formed integrally with the circumferential section 5, extends in the axial direction relative to the longitudinal axis of the stator and thus branches off at right angles from the circumferential section 5. The connection plug 6 is intended to be connected to a controller, by means of which the stator coils are actuated. Approximately half the length of the connector lug 6, on which there is a support shoulder 7 which extends outward on both sides of the connector lug 6 and is intended to be supported on a plastic support. On the circumferential section 5, a plurality of connection terminals 8 are present which, in the installed state, are in contact with the stator coil, and fixing hooks 9 are present for fixing to the stator body 2. The connection terminals 8 and the fastening hooks 9 are located on axially opposite sides of the connection plug 6.

A total of three conductor elements 4, which are each arranged as a single component on the stator body 2, are part of the wiring arrangement 3. The conductor elements 4 are not connected by an annular plastic carrier or the like, but are each connected directly to the stator body.

Fig. 3 and 4 show a support 10 which is designed as a plastic component and serves for axially supporting the conductor element 4. The support 10 has a slot-like opening 11 (see also fig. 5) for receiving the axial connecting plug 6 of the conductor element 4. Lateral fastening pins 12 are formed on the support 10, which fastening pins are located laterally to the slot-shaped opening 11 with respect to the longitudinal extent of the opening 11. Furthermore, the support 10 has a wall 13 which surrounds in a rectangular shape and encloses the slit-shaped opening 11. Due to this surrounding wall 13, the support 10 is designed as a hollow body.

As can be gathered from fig. 4, the two diametrically opposite wall sections of the circumferential wall 13 are arranged at an angle to one another in such a way that the distance between the opposite wall sections decreases at the height of the slot-like opening 11. Due to this inclination and the reduced longitudinal extent between the wall sections at the level of the slot-like opening 11, the connection plug 6 of the conductor element 4 can be passed axially through the slot-like opening 11 from below — in the region of the greater distance between the wall sections inclined relative to one another — upwards, although the transverse extent of the connection plug 6 at the level of the laterally projecting support shoulders 7 is greater than the distance between the wall sections at the level of the slot-like opening 11. Due to the inherent elasticity of the support element 10 made of plastic, the wall section expands when the connecting plug 6 is inserted. Then, the support shoulder 7 rests on the outer side of the wall section, which forms an axial support for the connecting plug 6 in the opposite direction. This ensures that axial forces acting from above on the free end face of the connector plug 6 are transmitted to the support 10, in particular when connecting to a control unit, via the support shoulder 7. Therefore, the connection terminals 8 arranged on the circumferential section 6 of the conductor element 4 and in contact with the stator coils are not subjected to such axial forces.

Fig. 5 shows a bearing cap 14, which is placed on the end face of the stator body 2 in the region of the wiring arrangement 3. During installation, the conductor elements 4 are first connected to the stator body 2 on the end side. The bearing cap 14 is then slipped on, in which a recess 15 is introduced, which serves to receive the circumferential rectangular wall 13 of the support 10. On the sides of the interspace 15 there are two openings 16 which receive the fixing pins 12 of the support 10. Correspondingly, the support 10 can be placed on a bearing cap 14, as is shown by the arrow in fig. 5, and connected to the latter by inserting the wall 13 into the recess 15 and inserting the fastening pin 12 into the opening 16. At the same time, the recess 15 in the support 10, which is coaxial to the slot-shaped opening 11, allows the connection plug 6 to pass through when the bearing cap 14 is fitted onto the end face of the stator body 2.

In fig. 6 and 7, the bearing cap 14 is shown in a view from below. The circumferential wall 13 of the support element 10 and the fastening pin 12 pass through an associated recess and opening in the bearing cap 14.

Fig. 8 shows the assembled stator 1 with the stator body 2, the wiring arrangement 3 and the bearing cap 14 fitted. The support 10 is located on the outer side of the bearing cap 14, and the connecting plug 6 projects through the slot-like opening 11 of the support and protrudes outward. The support shoulder 7 on the connector pins 6 rests on the outer side of each support element 10, so that an axial support is produced and axial forces acting on the connector pins 6 from the outside are guided via the support elements 10 to the bearing cap 14 and the stator body 2.

Claims

1. Stator for an EC motor, with a wiring mechanism (3) for connecting stator coils with a controller, wherein the wiring mechanism (3) is supported on a stator body (2) of the stator (1) and has a plurality of electrical conductor elements (4), characterized in that the electrical conductor elements (4) are separated and supported independently of each other on the stator body (2) or on a component connected to the stator body (2).

2. A stator according to claim 1, characterized in that the electrical conductor element (4) is supported on the stator body (2) or a component connected to the stator body (2) by means of a support (10), respectively.

3. A stator according to claim 2, characterized in that the support (10) supports the electrical conductor element (4) axially from the outside inwards on the stator body (2) or a component connected to the stator body (2).

4. A stator according to claim 2 or 3, characterized in that the electrical conductor element (4) has an axial connection plug (6) which passes through an opening (11) in the support (10).

5. A stator according to any one of claims 2 to 4, characterized in that a support shoulder (7) is formed on the axial connection plug (6) of the electrical conductor element (4), which support shoulder is supported on the support (10).

6. A stator according to any one of claims 2 to 5, characterized in that the support (10) is constructed as a plastic component.

7. A stator according to any of claims 1-6, characterized in that the electrical conductor element (4) is supported on a bearing cap (14) which is connected with the stator body (2).

8. A stator according to any of claims 2-6 and 7, characterized in that the support (10) is fixed on the bearing cap (14).

9. Stator according to any of claims 2 to 8, characterized in that lateral fixing pins (12) are arranged on the support (10).

10. Stator according to one of claims 2 to 9, characterized in that the support (10) is designed as a hollow body with a circumferential wall (13) which surrounds an opening (11) in the support (10) for receiving an axial connecting plug (6) of an electrical conductor element (4).

11. EC-motor having a stator according to any of claims 1 to 10 and having a rotor.