WO2014095551A2 - Stator for an electric machine - Google Patents

Abstract

The invention concerns a stator for an electric machine, comprising a plate stack and, at the end of the plate stack, an insulating plate which is connected to a switch plate. Incorporated in the switch plate is a first assembly recess and, in the insulating plate, a second assembly recess which are aligned with each other.

Description

 Description title

 Stator for an electric machine

The invention relates to a stator for an electric machine according to the preamble of claim 1.

State of the art

Stators for electrical machines have a disk set, which is formed from a plurality of superposed stator blades of a sheet metal material. The disk pack is limited at both opposite end faces of one end or cover plate, which is followed by an insulating lamination of electrically insulating material. On the side facing away from the disk pack, one of the insulating lamellae is connected to an interconnecting disk, via which coil windings, which are accommodated in the disk pack in the stator, are connected to the power supply.

When mounting the stator after the Bewicklungsvorgang the

Lamella package including the insulating lamellae and the faceplate inserted into a stator housing. The tool used for this purpose pushes the disk pack, including insulating disks and the locking disk, into the stator housing with an axial pressing force until the components have reached their axial position in the stator housing with a press fit. It must be ensured that the occurring pressing forces do not lead to damage to the stator components.

Disclosure of the invention

The invention has for its object to design a stator for an electric machine with simple measures easy to install. This object is achieved with the features of claim 1. The dependent claims indicate expedient developments. The stator according to the invention is used in electrical machines, for example in drive motors, which are used in motor vehicles, for example as a servomotor, or in hand-held machine tools. The electric machine is, for example, an internal rotor motor with an external, encompassing stator and an internal rotor.

The stator has a disk pack, which consists of a plurality

superimposed, individual stator blades is constructed, which are preferably made of a sheet metal material, in particular punched out of a metal sheet. At least one end-side end or cover plate is followed by an insulating lamella made of electrically insulating material; Preferably, an insulating lamella is arranged in each case on both end faces of the disk pack. An insulating lamella is connected on the side facing away from the disk pack axial side with a Verschaltscheibe for supplying the windings with electricity. The insulating lamella can be positively connected to the Verschaltscheibe.

At least one first mounting recess and at least one associated, second mounting recess are introduced into the interconnecting disk, wherein the first and the second mounting recess in the

Locking plate or the insulating lamella in the assembled state are aligned. The first and the second mounting recess extending axially from the outer end face of the Verschaltscheibe to the front side of the disk pack. This embodiment makes it possible to apply during assembly, the relatively high axial pressing forces exerted by a mounting or pressing tool, directly on the mounting recesses on the front side of the disk pack and in this way the

Press the plate pack with a press fit into a receiving stator housing. The assembly or pressing tool projects in this case with a finger into the mutually aligned mounting recesses in the insulating and the Verschaltscheibe and acts on the front side of the plate pack, which is usually made of laminations and accordingly has a higher stability than the Isolierlamelle and the Verschaltscheibe, which are preferably made of plastic. During assembly, therefore, the insulating plate and the Verschaltscheibe are not exposed to axial compressive forces, so that the risk of damage to insulating plate or Verschaltscheibe is significantly reduced during the assembly process.

Distributed over the circumference can be several first and second

Mounting recesses be introduced into the Verschaltscheibe or the insulating lamella, so that correspondingly at several points of the circumference of an axial pressing force on the mounting or pressing tool on the front side of the disk pack can be exercised.

According to a further expedient embodiment, the Verschaltscheibe distributed over the circumference on several Wicklungsträgersegmente, each having an access slot for the windings of the associated individual teeth on the disk set. The access slot is designed to be open axially towards the free end side and receives the coil wire. The access slot extends axially through the winding support segment between both end faces of the Verschaltscheibe and aligned in the mounted state with the

Mounting recess in the insulating lamella, which also extends over the entire axial height of the insulating lamella.

To ensure that the mounting or pressing tool with a finger through the access slot and the mounting recess in the insulating lamella, without the wall of the access slot in the

Can damage winding carrier segment, in the wall of the

 Access slot in the winding support segment be introduced the first mounting recess, which reduces the axial height of the wall in the winding support segment at this point. The mounting recess preferably extends only over an axial partial length of the axial height of the

Interlocking disc in the area of the winding carrier segment. The

 Mounting recess advantageously extends to the axially free, the insulating lamella facing away from the end of the winding support segment. The axial extension of the mounting recess is preferably at least 50% of the total axial height of the Verschaltscheibe in the region of

Wicklungssträgersegmentes, whereby the axial extent of a einragenden finger of the assembly or pressing tool accordingly reduced.

According to a preferred embodiment, several are distributed over the circumference

Mounting recesses introduced in winding carrier segments. One per

Mounting recess is advantageously located on the radially inner wall of the winding support segment, so that a corresponding finger of the assembly or pressing tool protrudes radially from inside to outside and with a corresponding axial component through the mounting recess in the wall of the winding support segment.

Each mounting recess in the face plate is at least one

Assembled mounting recess in the insulating lamella. Optionally, a mounting recess in the Verschaltscheibe at least two

Assembled mounting recesses in the insulating lamella, so that the

 Insulating lamellae can be installed in two different angular positions and aligned with each other in each angular position mounting recesses in the Verschaltscheibe and in the insulating lamella. In the case of several distributed over the circumference mounting recesses, it may be appropriate that they are arranged evenly distributed. But it is also possible an uneven distribution of mounting recesses, especially in the Verschaltscheibe, which constructive restrictions in the Verschaltscheibe can be accommodated. In a higher number of mounting recesses in the insulating lamellae arranged there recesses can be positioned in contrast to the Verschaltscheibe at a regular angular distance from each other, as due to the higher number of mounting recesses in different mounting angle layers of the insulating lamellae of mounting recesses with the

Panel is possible. For example, three are in the Verschaltscheibe

Mounting recesses introduced at a different angular distance and in the insulating lamellae six mounting recesses, each of which two adjacent to each other at a small angular distance and the Montageaussparungs pairs are positioned to each other at a regular angular distance of 120 °. Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:

1 is a perspective view of a stator of an electric machine with a disk set with a front-side insulating lamella, which is a carrier plate,

2 in exploded view, the disk set with the Verschaltscheibe,

3 shows a section through the stator, with a stator housing for receiving the plate pack including insulating lamellae and plate,

4 is a view of the end face of the stator,

Fig. 5, the insulating lamella in plan view.

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

In Fig. 1, 2 and 3, a stator 1 is shown for an electrical machine, in particular for an electric internal rotor motor. The stator 1 has a stator or disk pack 2, which is constructed from a plurality of individual stator blades, which are stacked on one another. Furthermore, one is

Panel 4 arranged on the front side of the plate pack 2, are supplied via the windings 5 in the plate pack 2 with power. Between the disk set 2 and the Verschaltscheibe 4 an insulating lamella 3 is arranged, which consists of an electrically insulating material, in particular of plastic. The insulating lamella 3 can be designed as a plastic injection-molded component. A corresponding insulating lamella is also located at the opposite axial end face of the disk set second

The disk set 2 is designed slanted and has radially inwardly directed carrier teeth around which the windings 5 are placed. Due to the skew, the windings 5 extend at an angle to the stator longitudinal axis 7. Between adjacent windings 5 is in each case an insulating strip 6, which extends over the entire axial height of the disk set 2. Due to the slanted design of the disk set 2, the insulating strips 6 also have an angle relative to the longitudinal axis 7 of the disk set. The length of the insulating strip 6 is dimensioned so that both end faces of the

Lamella packages 6 are surmounted by the insulating strip. The insulating strip 6, which are designed for example as a paper strip, are received and held in the region of their respective free end portions of the insulating lamellae 3, which are located on both end faces of the plate pack 2.

As shown in FIGS. 1, 2 and 4, the Verschaltscheibe 4 distributed over the circumference of a plurality Windungssträgersegmente 8, in which axially extending access slots 9 are inserted for winding support of the windings for each one underlying coil. The access slots 9 in the winding support segments 8 extend axially over the entire height of

Panel 4, they are thus open at both ends.

A total of three of the winding support segments 8 have an additional first mounting recess 10 on the radially inner wall in the

Winding carrier segment 8. The mounting recess 10 extends from the axially upper, the insulating lamella 3 facing away from the end of the winding support segment 8 over more than half the axial height of the Verschaltscheibe 4, in particular over about two-thirds of the axial height. Overall distributed over the circumference three winding support segments 8 are provided with an additional, axially extending mounting recess 10, of which two mounting recesses 10 are arranged in Wicklungssträgersegmenten 8, which are offset at a 90 ° angle to each other and the third approximately in a 120 ° Angle to a mounting recess or a 150 ° angle to the other Montageaussparung stands.

The first three mounting recesses 10 in the Verschaltscheibe 4 are assigned a total of six second mounting recesses 1 1 in the Isolierlamelle 3 (Fig. 5). Each individual mounting recess 10 in the Verschaltscheibe 4 are assigned two adjacent mounting recesses 1 1 in the Isolierlamelle 3, which form a Montageaussparungs pair. The

Mounting recesses 1 1 in the insulating lamella 3 are located at the radial outer side of an outer ring 12, from which support teeth 13 extend radially inwardly, which are carriers of the windings. The total of six mounting recesses 1 1 on the outer ring 12 each extend in the axial direction completely over the axial height of the insulating lamella 3, the

Mounting recess pairs are circumferentially offset at a 120 ° angle to each other. Each two mounting recesses 1 1 are immediately adjacent, but offset in the circumferential direction to a

Support tooth 13. In each case two adjacent mounting recesses 1 1 on the insulating lamella 3 are associated with a mounting recess 10 on the Verschaltscheibe 4. On the outer side of the outer ring 12 of the insulating lamella 3 are distributed over the circumference evenly distributed a total of three locking lugs 14 which protrude during assembly in associated recesses on the inner wall of the female stator housing. Thus, the insulating lamella 3 can be used in a total of three different angular positions in the stator housing.

Since each 120 ° -Winkellage two adjacent mounting recesses 1 1 are assigned in the insulating lamella 3, an aligned arrangement of

Mounting recess 1 1 in the insulating lamella 3 with an associated

 Mounting recess 10 can be achieved in the Verschaltscheibe 4, regardless of which 120 ° -Winkellage the insulating lamella 3 is installed in the stator. Depending on the installation position, one of the two adjacent ones arrives

Mounting recesses 1 1 in the insulating 3 in an aligned position with a mounting recess 10 in the Verschaltscheibe 4. This ensures that in each case each mounting recess 10 in the

Locking plate 4 is aligned with a mounting recess 1 1 in the insulating 3, so that in the assembled state an axially continuous path in the region of the three mounting recesses 10 is formed from the outer end face of the Verschaltscheibe 4 to the underlying end face of the disk set 2.

This design makes it possible, the plate pack 2 with an axial

Pressing force, which is exerted by a mounting or pressing tool to press into the receiving stator housing 15 (Fig. 3, 4). The Montagebzw. Press tool engages over the aligned Mounting recesses 10 and 1 1 in the Verschaltscheibe 4 and der

Insulating lamella 3 directly on the front side of the plate pack 2, which can accommodate high axial pressing forces readily due to its design of laminations. In contrast, the insulating strips 3 and the Verschaltscheibe 4 are not acted upon by these high pressing forces and thus are not subject to the risk of damage during the press-fitting of the disk set in the stator housing.

As can be seen from the sectional illustration according to FIG. 3, the stator housing 15 has a radially widened shoulder 15a, in which the insulating lamella 3 and the connecting disk 4 are accommodated. In contrast, the disk set 2 is pressed into the radially smaller section of the stator housing 15 with an axial pressing force.

In addition, on the mounting recesses 10 and 1 1 in the Verschaltscheibe 4 and the Isolierlamelle 3, the assembly or pressing tool on the radially inner side of the carrier teeth 13 on the Isolierlamelle 3 attack and at this point the underlying plate set 2 with axial pressing force apply.

Claims

claims 1 . Stator for an electric machine, with a disk pack (2),  consisting of a plurality of superposed lamellae, with energizable windings (5) in the disk set (2), wherein on at least one end face of the disk pack (2) an insulating lamella (3) is arranged on the side facing away from the disk pack (2) with a  Panel (4) for supplying the windings (5) is connected to power, characterized in that in the Verschaltscheibe (4) a first mounting recess (10) and in the insulating lamella (3) a second mounting recess (1 1) is introduced, wherein the first and the second mounting recess (10, 1 1) in the Verschaltscheibe (4) or the  Align insulating plate (3) with each other. 2. Stator according to claim 1, characterized in that the Verschaltscheibe (4) distributed over the circumference a plurality Windungssträgersegmente (8) having an axially open access slot (9) for a winding and the first mounting recess (10) in the wall of a  Winding support segment (8) is introduced. 3. Stator according to claim 1, characterized in that distributed over the circumference a plurality of mounting recesses (10) in winding support segments (8) are introduced. 4. Stator according to claim 2 or 3, characterized in that the  Mounting recesses (10) is introduced into the radially inner wall of the winding support segment (8). 5. Stator according to one of claims 1 to 4, characterized in that a mounting recess (10) in the Verschaltscheibe (4) at least two mounting recesses (1 1) in the insulating lamella (3) are assigned. 6. Stator according to claim 5, characterized in that distributed over the circumference three mounting recesses (10) in the Verschaltscheibe (4) and six mounting recesses (1 1) in the insulating lamella (3) are introduced. 7. Stator according to claim 5 or 6, characterized in that the  Mounting recesses (10) in the Verschaltscheibe (4) are distributed unevenly around the circumference. 8. Stator according to one of claims 1 to 7, characterized in that the plate pack (2), the insulating plate (3) and the Verschaltscheibe (4) are accommodated in a stator housing (15). 9. Stator according to claim 8, characterized in that the insulating lamella (3) has a larger outer diameter than the plate pack (2) and insulating lamellae (3) and Verschaltscheibe (4) in a radially enlarged shoulder (15 a) of the stator housing (15) added are. 10. Electrical machine with a stator (1) according to one of claims 1 to 9.