WO2010066491A2

WO2010066491A2 - Electric motor, in particular servo or drive motor in motor vehicles

Info

Publication number: WO2010066491A2
Application number: PCT/EP2009/063531
Authority: WO
Inventors: Johannes Duerr; Stefan Keil; Wolfgang Hilgers; Adolf Dillmann
Original assignee: Robert Bosch Gmbh
Priority date: 2008-12-11
Filing date: 2009-10-16
Publication date: 2010-06-17
Also published as: DE102008054529A1; WO2010066491A3; CN102246391B; CN102246391A

Abstract

The invention relates to an electric motor having a stator in a motor housing and a rotor shaft that is mounted in a stator housing. According to the invention, a respective bearing plate is located on opposite end faces of the motor housing and a bearing part for the rotor shaft is housed in each bearing plate. The bearing plates are connected directly to the motor housing.

Description

description

title

[ELECTRIC MOTOR, ESPECIALLY STORAGE OR DRIVE MOTOR IN MOTOR VEHICLES!

The invention relates to an electric motor, in particular an actuating or drive motor in motor vehicles.

State of the art

In US 2006/0091759 a permanent-magnet internal-rotor DC motor is described, the stator of which comprises in a housing a fixedly arranged stator packet, which is constructed from a plurality of individual lamellae. The lamellae are arranged axially one behind the other and support a stator winding, via which a magnetic field is generated, which with

Permanent magnet on the rotor shaft cooperates. The lamellae form a coherent package and are held together axially by suitable clamping means.

Disclosure of the invention

The invention is based on the object to form an electric motor in such a way that with simple adaptation measures different electric motor sizes can be realized.

This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

The electric motor according to the invention is used, for example, as a positioning or drive motor in motor vehicles. Applications may be considered

Starter motor, as a steering motor or for operating an auxiliary unit such as For example, a windshield wiper, a window lifter or a Sitzverstellmotors. The electric motor has a stator in a motor housing and a rotor shaft rotatably mounted in the stator.

At the opposite end faces of the motor housing, a bearing plate is arranged in each case, wherein in each bearing plate, a bearing part is received for the rotor shaft. The bearing plates are directly connected to the stator housing.

In this way, a modular construction of the electric motor is achieved. Depending on

Requirement different sized or long motor housing and correspond differently shaped stators or rotors can be used without affecting the construction of the bearing plates on the front sides of the motor housing. Thus, the same bearing plates can be used on the front sides for different motor housing and stators or rotors. As a result, the variety of parts is reduced despite different engine performance.

Since the bearing plates are directly connected to the motor housing, can be dispensed with the use of tie rods, which are common in embodiments of the prior art.

Another advantage is the improved overall stiffness of the engine. According to a preferred embodiment, the bearing plates are welded to the motor housing or shrunk onto the motor housing, whereby an improved connection between bearing plates and motor housing is given. The increased rigidity has a positive effect on the torque curve. In addition, the heat dissipation is improved since the bearing plates themselves as well as the motor housing participate in the heat radiation. Furthermore, sealing elements, which are required in the prior art, between bearing plates and

Motor housing can be omitted. Due to the cohesive connection between the bearing plates and motor housing a sufficient tightness is given. The material bond between the bearing plates and the motor housing is produced in particular by welding, wherein in principle also mechanical connection measures such as the above-mentioned shrinking come into consideration. In a preferred embodiment, the bearing plates are fastened exclusively to the motor housing, so that in particular no further connecting elements such as the already mentioned tie rods or the like for the assembly of bearing plates and motor housing are required.

Furthermore, it is possible for at least one of the bearing plates to be a carrier for electronic components which generate actuating signals which act on the electric motor. The relevant bearing plate thus assumes, in addition to its function, the motor housing frontally final function and their task to receive the bearing part for the rotor shaft, an additional component-bearing function.

The bearing parts are expediently designed as independent components, in particular as bearing rings, which are used in the bearing plates and are supported by them. Due to the fixed connection between the bearing plates and the motor housing, a secure and centric mounting of the rotor shaft in the electric motor is achieved in this way.

According to an expedient development, the stator consists of a plurality of circumferentially arranged single stator elements, which form carrier teeth, each carrier tooth being provided with a wound coil. The coils on the carrier teeth are electrically connected to each other or are electrically energized from the outside. The electrical contact is produced in particular by means of a contact ring, which is preferably a carrier of contact elements for electrical connection to the coils on the carrier teeth.

The contact ring is connected to one of the bearing plates or is held by a bearing plate. This is done in particular in such a way that the contact ring on the end face of the stator is fixed by the bearing plate, which is connected to the motor housing.

Preferably, the electronic components and the contact ring are located on the same bearing plate, contact ring, bearing plate and electronic components expediently form a coherent, prefabricated unit, whereby the assembly is simplified. According to a further expedient embodiment, it is provided that the carrier teeth are arranged at an angle relative to the stator longitudinal axis, such that the tooth longitudinal axis of each carrier tooth forms an angle with the stator longitudinal axis. This angle is preferably in an angular range of up to about 30 °, in particular up to 10 ° or slightly less than 10 °, with basically any angle values up to the specified maximum values being considered. The angular arrangement of the carrier teeth and the coils located thereon has the advantage that a smoothing of the torque output by the electric motor is achieved.

Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:

Fig. 1 in an exploded view, the components of an electric motor, wherein the stator is composed of individual carrier teeth, each with a coil which are electrically connected to each other using a contact ring and disposed thereon insulation displacement terminals, as well as disposed on a front side, output side bearing plate, directly with the Motor housing of the electric motor is connected,

2 shows a detail of an electronic assembly which is seated on a further bearing plate, which is arranged on the opposite end face of the electric motor,

3 is a side view of the stator of the electric motor, which consists of a plurality of circumferentially distributed carrier teeth, which are arranged at an angle relative to the stator longitudinal axis,

4a is a perspective detail view of a carrier tooth with a coil,

4b is a side view of a carrier tooth with coil,

5 shows a section through a carrier tooth with coil, 6 is a plan view of a carrier tooth with coil, wherein the wire ends of the coil winding are each guided over an introduced into the front side of the carrier tooth receiving pocket,

7 is a perspective view of the realized via clips mechanical connection between adjacent support teeth,

Fig. 8 is an enlarged view of realized via a clip connection

Connection between two immediately adjacent support teeth,

9 is a perspective view of a contact ring, consisting of a plurality of individual rings, each having a plurality of insulation displacement terminals, which form contact elements,

10 shows the contact ring with the individual rings in exploded view,

1 1 is a perspective view from above of the mounted electric motor,

12 shows a section through the electric motor with a magnet inserted into the front side of the rotor shaft as part of a rotor position sensor system.

In the figures, the same components are provided with the same reference numerals.

In Fig. 1, the components of an electric motor 1 are shown in exploded view. The electric motor 1 is designed as an internal rotor motor and comprises a rotor shaft 2, which is the carrier of a rotor stack 3. The rotor shaft 2 including the rotor core 3 is in the assembled state in a stator 4, which is the carrier of several, distributed over the circumference coils, which are electrically contacted and supplied with power via an axially arranged on the stator contact ring 5 and disposed thereon insulation displacement terminals 6. At the

Output side of the electric motor is a first bearing plate 7 (A bearing plate), which receives a bearing part 8 for the rotor shaft 2. The A-bearing plate 7 is fixedly connected to a motor housing 10 which receives the stator 4 including the rotor shaft 2. On the A-bearing plate 7 axially opposite end face is another bearing part 9 for supporting the rotor shaft 2. The bearing part 9 is in the assembled state in a further bearing plate 1 1 (B-bearing plate, shown in Fig. 2) added. The bearing plate 1 1 is also a carrier of electronic components 12, via which the control or regulation of the electric motor 1 takes place.

The A-bearing plate 7 and the B-bearing plate 1 1 grasp the motor housing 10 at opposite axial end faces and are directly or directly connected to the motor housing 10. Appropriately, it is an exclusive connection of each bearing plate 7, 1 1 with the motor housing 10, so that beyond this connection, no further connection measures such as tie rods between the bearing plates or the like are required. The connection is made by welding between the end face of the motor housing 10 and the bearing plates 7 and 1 1 or by shrinking. In any case, a tight connection is achieved, so that can be dispensed with the use of additional sealing elements between the bearing plates and the motor housing. Another advantage is the improved stiffness, which is increased due to the direct connection of bearing plates and motor housing. The improved stiffness also has a positive influence on the torque curve. Furthermore, the heat dissipation is improved. In addition, a modular system is realized in this way, in which depending on the required application of differently long-trained stator or motor housing 10 can be used without any other change in the components of the electric motor. Since the connection between each bearing plate and the motor housing via welding or shrinking or the like is done and not on tie rods, no further adaptation measures are required even with different long motor housings.

The contact ring 5 with the contact elements designed as insulation displacement terminals 6 is expediently held by the B support plate 11, just like the bearing part 9.

As can be seen from FIG. 3, the stator 4 consists of a multiplicity of individual carrier teeth 13, which are distributed over the circumference and which each support a coil 17. The carrier teeth 13 close with the stator longitudinal axis 14, which also forms the longitudinal axis of the electric motor, (FIG. 1), an angle α. In Fig. 3 is a tooth longitudinal axis 15 registered by a support tooth 13, wherein the side edges of each support tooth 13 extend parallel to the tooth longitudinal axis 15. The angle α under which each carrier tooth 13 is aligned at an angle relative to the stator longitudinal axis 14 lies in the exemplary embodiment in an angular range of less than 10 °, in particular about 8 °. The angle α can advantageously also assume value ranges greater than 10 °, for example up to 30 °, or even significantly smaller values than 10 °. Basically, ranges of values in arbitrary gradations between approximately 1 ° and approximately 30 ° or possibly even beyond should be possible.

The angular arrangement of the carrier teeth 13 with respect to the stator longitudinal axis 14 has the advantage that a smoothing or equalization of the torque curve can be achieved thereby. Since a magnetic field is generated in each individual coil, each coil contributes to the generation of the torque, due to the discrete number and positioning of the coils

17 seen over the circumference of the stator 4 basically sets in a rectilinear positioning of carrier teeth and coils a non-circular torque curve. By the proposed inclination of the carrier teeth of the non-round torque curve is smoothed.

Each carrier tooth 13 has an end portion 16 into which the coil wire ends 17a and 17b are received in cuts 18. Via the coil wire ends 17a and 17b, the electrical contact between the insulation displacement terminals 6 takes place on the contact ring 5 (FIG. 1).

The end portions 16 on each support tooth 13 are aligned coaxially or axially parallel to the stator longitudinal axis 14, so that each end portion 16 with the angularly oriented tooth base body 19 of each support tooth 13 also includes an angle α. This facilitates the axial placement or insertion of the insulation displacement terminals 6, which are held on the contact ring 5, on the

Coil wire ends 17a and 17b of each coil 17.

FIGS. 4a, 4b, 5 and 6 each show a carrier tooth 13, which forms a single stator element, in a single representation. 4a and 4b it can be seen that the coil 17 is wound around the base body 19 of the carrier tooth 13 and that the free coil wire ends 17a and 17b in the region of the end portion 16, which is formed integrally with the base body 19, are guided by the cuts 18 in the end portion 16.

From Fig. 5 it is seen that the tooth base body 19 is formed in cross-section double-T-shaped, so that lateral boundaries for the coil 17 are formed and the coil wire is securely held on the tooth base body 19. In the region of the double-T-shaped groove, the surface of the tooth base body 19, which is formed as a laminated core, is encapsulated with a plastic casing 20, whereby the coil 17 is electrically insulated from the base body 19. The other areas of the tooth base 19 have no plastic coating.

It may be expedient to provide the walls of the tooth base body in the region of the double T-slot with grooves for the wire of the coil 17, in which the wire is inserted and thereby guided safely.

As shown in FIG. 6, two parallel, mutually staggered receiving pockets 21 are introduced into the upper end face of the end portion 16, over which the coil wire ends 17 a and 17 b are guided. The incisions 18, in which the coil wire ends 17 a, 17 b are inserted, are introduced into the receiving pockets 21 defining walls. The receiving pockets 21 serve on the one hand for receiving a chip (baubles), which can arise during the connection process with the insulation displacement contacts on the contact ring by shearing. On the other hand, the receiving pockets 21 serve to receive the axially projecting part of the insulation displacement terminals, whereby a compact design is achieved in the axial direction.

In Figures 7 and 8, the connection between immediately adjacent carrier teeth 13 is shown. The connection is preferably made exclusively by mechanical means using latching elements, which in the exemplary embodiment are designed as a clip connection 22. Each clip connection 22 comprises two latching elements, which are each arranged on a carrier tooth 13 and designed to be complementary to each other. In the embodiment, this is a Klipsvorsprung 23 on a first carrier tooth 13 and an associated, complementary formed Klipsausnehmung 24 on the immediately adjacent carrier tooth 13. The Klipsvorsprung 23 is ball or teilku- executed gel-shaped or cylindrical, accordingly, the Klipsausnehmung 24 is also provided with a spherical or part-spherical or cylindrical recess. In order to allow the required degree of elasticity for the realization of the clip connection, in which the clip elements are locked together, the elements of the clip connection made of a material with sufficient elasticity and / or the clip elements are formed relatively thin-walled or a thin-walled portion with the respective Carrier tooth 13 connected. For example, it is possible to manufacture the clip elements of the clip connection 22 from a plastic material by molding the clip elements directly onto each carrier tooth. But it is also possible a version made of metal.

Figures 9 and 10 relate to the contact ring 5, which is carrier of the insulation displacement terminals 6, electrically connected to one another via the coils of different carrier teeth and supplied with current. The contact ring 5 consists of a plurality of individual rings 25, which are each carrier of the insulation displacement terminals 6 and which are axially stacked. Between each two axially adjacent individual rings 25 is a separating ring 27. Axially at the bottom is a base ring 26 as a carrier of all individual rings 25 and separating rings 27th

By combining different individual rings 25, on each of which insulation displacement terminals 6 are arranged, a desired interconnection between the various coils of the stator can be achieved.

In Fig. 1 1, the electric motor 1 1 is shown in the assembled position, wherein the bearing plate 1 1, which carrier of the electronic components 12 is (Fig. 2), indicated only schematically. The contact ring 5 with the insulation displacement terminals 6 is placed on the front side of the stator for electrical connection with the coils on each support tooth of the stator. On Kontaktaktring 5 axially on the opposite side of the insulation displacement terminals 6 axially superior contact elements 28 for e- lektrischen connection to the electronics or the power supply are arranged.

As can be seen from FIG. 12, a magnetic element 29 is inserted into the axial end face of the rotor shaft 2 on the side facing the contact ring 5. This is preferably located in a recess in the end face of the rotor shaft. 2 The magnetic element 29 is part of a rotor position sensor via which the current rotor position of the rotor shaft 2 can be determined.

Claims

claims

1 . Electric motor, in particular actuating or drive motor in motor vehicles, having a stator (4) in a motor housing (10) and a rotor shaft (2) mounted in the stator (4), characterized in that on the opposite end faces of the motor housing (10) in each case a bearing plate (7, 1 1) is arranged, wherein in each bearing plate (7, 1 1) a bearing part (8, 9) for the rotor shaft (2) is received, and that the bearing plates (7, 1 1) directly with the motor housing (10) are connected.

2. Electric motor according to claim 1, characterized in that the bearing plates (7, 1 1) are fastened exclusively to the motor housing (10).

3. Electric motor according to claim 1 or 2, characterized in that the bearing plates (7, 1 1) on the motor housing (10) are welded.

4. Electric motor according to one of claims 1 to 3, characterized in that a bearing plate (7, 1 1) carrier of the electric motor (1) acting on electronic components (12).

5. Electric motor according to one of claims 1 to 4, characterized in that the stator (4) has a plurality of circumferentially arranged Einzelstatorelemente forming the carrier teeth (13), each carrier tooth (13) with a wound coil (17) is provided and the coils (17) on the support teeth (13) are electrically connected to each other.

6. Electric motor according to claim 5, characterized in that the electrical connection between the coils (17) by means of a contact ring (5), wherein the contact ring (5) with one of the bearing plates (7, 1 1) is connected.

7. Electric motor according to claim 4 and 6, characterized in that the E- lektronikbauteile (12) and the contact ring (5) on the same bearing plate (1 1) are arranged and form a coherent structural unit.

8. Electric motor according to one of claims 5 to 7, characterized in that the carrier teeth (13) are arranged at an angle relative to the stator longitudinal axis (14), so that the tooth longitudinal axis (15) of the carrier teeth (13) with the stator longitudinal axis (14) Includes angle (α).

9. Electric motor according to one of claims 5 to 8, characterized in that on the support teeth (13) locking elements (23, 24) for mechanical connection of the carrier teeth (13) are arranged one below the other.

10. Electric motor according to one of claims 5 to 9, characterized in that on the carrier tooth (13) at least one receiving pocket (21) is formed, in which a contact element (6) can be inserted.

1 1. Electric motor according to one of claims 1 to 10, characterized in that the contact elements (6) are designed as clamping elements, in particular as insulation displacement terminals (6).

12. Electric motor according to one of claims 1 to 1 1, characterized in that the carrier teeth (13) with the coils (17) form the stator (4).