JPH09121500A - Electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high concentricity between a rotor and a stator hole. SOLUTION: Two hood-like casing sections 171, 172 of a casing 17 which surrounds a stator thin plate set having a stator winding are directly centered in the radius direction. Therefore, one casing section 171, 172 has a concentric centering pipe piece 22 which has, at its end facing the other casing section 171, 172, a machined fitting face which extends in the circumferential direction of the outside. And, the other casing section 171, 172 is provided with a molded member 24 to cover the fitting face by its inside circular arc section at a space for the angle of rotation away from one casing section 171, 172. The stator thin plate set is fixed through many central thin pieces of the stator thin plate set. The central thin pieces project on the external face of the stator thin plate set in the radium direction and are nearly connectively housed between facing side face sections of the molded member 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric machine of the type described in the preamble of claim 1 and, more particularly, to a three-phase generator for an automobile.

[0002]

2. Description of the Prior Art In a known three-phase generator for motor vehicles of the above type (West German Utility Model No. 9301825), four protrusions on each of three central thin sections extend in the circumferential direction of one casing portion. Are located in four axially arranged recesses which are evenly distributed and contact the bottom of the recess at this recess. One bulge (Podest) is provided in the circumferential direction of the other casing portion on the side of the protrusion opposite to the depression.

In this case, since the substantially semicircular cross section of the bulging portion is smaller than the semicircular cross section of the depression as well,
In order to clamp and fix the protrusion between the bulge and the bottom of the recess, the bulge projects into the recess. In this case, the clamping force is exerted by four clamping screws, which are inserted through the holes in the bulge and the through holes in the projections of the central flakes and in the casing part with the depression, It is screwed into a respective threaded hole which is aligned with said hole.

Each casing part carries a swivel arm with holes, in which case the three-phase generator can be bolted to the engine of the motor vehicle.
After mounting the two casing parts, the holes must be aligned with each other. In order to align the holes, both casing parts need to be adjusted and joined to one another at the correct angular position of rotation. The rotation angle adjustment is ensured by a centering unit having a centering pin and a centering recess, the centering pin preferably being formed by enlarging one of the four bulges as a centering bulge, The centering bulge engages in the associated recess of the other casing part in an engagement connection manner in the circumferential direction.

[0005]

The object of the present invention is to improve the known machines.

[0006]

According to the invention, the object is solved by the machine according to the invention as defined in the characterizing part of claim 1.

[0007]

An advantage of the electrical machine according to the invention as defined in the characterizing part of claim 1 is that a very high coaxiality of the rotor and the stator bore is obtained. This is because both casing parts are directly centered in the radial direction and, on the other hand, the stator lamella set is fixed in one casing part. In this case, the required centering element is constructed so that a tool whose axial direction is adjusted parallel to the machine axis may be used to machine the centering element. As a result, the casing part is processed inexpensively and suitable for mass production. Similarly, the machine can be assembled in a cost-effective manner and suitable for mass production. This is because the so-called temporary insertion of the casing part is unnecessary, that is, the preliminary mounting on the bearing mandrel at the time of screw connection is unnecessary.

Advantageous configurations and improvements of the electrical machine according to claim 1 are obtained by the features of the other claims.

In an advantageous configuration of the invention, the central lamella has a circumferentially extending annular support surface projecting from the peripheral surface of the stator lamella set, to which the projection is integrally formed. . The central lamellas come into close contact with one another at the support surfaces under the pressure of the clamping screws and contact the annular end faces of both casing parts. The support surface of the central piece provides a large clamping surface and at the same time reduces the load on the projections due to the clamping force, so that the milling of the casing part in the area of the projections, which is conventionally required, is no longer necessary.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A three-phase generator for a motor vehicle, as a special example of an electrical machine, partially shown in side view and partially in longitudinal section in FIG. There is provided a stator lamella set 10 of 11 for receiving stator windings (see FIG. 2) not shown in a known manner in grooves 12 (see FIG. 5). ing. The central three thin pieces of the stator thin plate assembly 10, the so-called central thin pieces 14 (one of which is partially shown in the plan view of FIG. 5), are respectively arranged in one circumferential direction projecting from the circumferential surface of the stator thin plate assembly 10. Has a ring-shaped support surface 15 which extends integrally with four projections 16 which are arranged at equal angular intervals to each other.

A stator thin plate assembly 10 having a stator winding.
Is completely surrounded by a two-part casing 17 with both hood-shaped casing parts 171, 172. In this case, the stator thin plate set 10 is clamped between the casing parts 171 and 172 via the central thin piece 14. For this purpose, the support surfaces 15 of the three central lamellas 14 are in close contact with each other and both casing parts 171,
Contacting the annular end surface of 172 and both casing parts are clamped together by a total of four clamping screws 18 (one of which is shown in FIGS. 1 and 2).

In this case, the tightening screws 18 each have a hole 19 in one casing part 171 and a central slice 15 respectively.
It is inserted through the through hole 20 in the inside (see FIG. 5) and is screwed into the screw hole 21 of the other casing portion 172 (see FIG. 2). The through-hole 20 in the central thin piece 14 is arranged in the projection 16 of the central thin piece 14 and includes the casing parts 171, 172 and the central thin piece 14.
The extent of the support surface 15 is reached in order to improve the crimping force between and.

In order to center both casing parts 171, 172 and the stator lamella set 10 in the radial direction,
One casing part 171 is the other casing part 1
On the side facing 72, it carries a coaxial, unitary centering tube piece 22 with a turned fitting surface 23 extending in the outer circumferential direction, whereas the other casing part 172 has Formed members 24 are arranged at rotational angular intervals with respect to one another and are formed over the fitting surface 23 by an inner arcuate section 241 in a precision fit (FIG. 3 and FIG. 3). (See FIG. 4).

Further, at least one molding member 24 is
Side walls 242, 24 located opposite each other in the circumferential direction
3, the side walls receive the joint projections 16 of the three central lamellas 14 between the side walls in a substantially engaging connection. In this case, the molding member 24 is cast in one piece into the casing part 172. By the centering means,
On the one hand, a high coaxiality of both casing parts 171, 172 is guaranteed when the casings 17 are combined, and
On the other hand, since the coaxiality of the stator thin plate assembly 10 in the casing 17 is also ensured, highly accurate coaxiality between the rotor and the stator hole can be obtained after the three-phase generator is assembled.

As not shown, although not shown, each casing portion 171 and 172 is integrally formed with a mounting arm having a mounting hole. In this case, both mounting arms are used for three-phase power generation in an automobile engine. Used to fix the machine. For this purpose, the fixing pin is guided through both mounting holes in the mounting arm, in which case it is necessary to align both mounting holes after the casing 17 has been assembled.

In order to guarantee such alignment, the casing 17 is provided with a centering unit 25 (first
(See FIG. 4 and FIG. 4), this centering unit 25
Is composed of a centering pin 27 formed in one casing portion 172 and a centering recess 26 formed in the other casing portion 171. In this case, the centering pin 27 is axial
Extends from the end face into the other casing part 171 and engages in the centering recess 26 of the casing part 171 on the end face side. The centering recess 26 is
The centering pin 27 is received in an engagement connection type in the circumferential direction (see FIG. 1).

[Brief description of the drawings]

1 is a partial side view of a three-phase generator for an automobile.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG.

[Explanation of symbols]

 10 Stator Thin Plate Assembly 11 Thin Piece 12 Groove 15 Support Surface 16 Protrusion 17 Casing 18 Tightening Screw 19 Hole 20 Through Hole 21 Screw Hole 22 Centering Pipe Piece 23 Fitting Surface 24 Forming Member 25 Centering Unit 26 Centering Recess 27 Centering Pin 171,172 Casing part 241 Arc section 242, 243 Side wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hermann Lehnerz Ferbach-Tenhofer Weg 35, Germany 35 (72) Inventor Eugen Herrekes, Germany Stuttgart Landauer Strasse 25 (72) Inventor, Thomas Birzing, Germany Hiheim-Bissingen Breslauer Strasse 89

Claims (5)

[Claims] 1. A three-phase generator for an electric machine, in particular a motor vehicle, provided with a stator lamella set (10) for supporting a stator winding, said stator lamella set comprising a number of lamellas (11). Of the flakes, a plurality of central flakes (1
4) has projections (18) projecting radially from the peripheral surface of the stator thin plate assembly (10), and each of the projections has one through hole (20). A casing (17) consisting of two parts (10) and surrounding the stator winding is provided, and between the casing hood-like casing parts (171, 172) of the casing, a central thin piece (of the stator thin plate set (10) ( 14) is tightened, in which case the tightening force is
71, 172) are screwed together to form the through hole (2
0) is provided by a tightening screw (18) penetrating therethrough, and a centering unit (25) for fixing both casing parts (171, 172) to each other at a predetermined rotation angle is provided, and the centering unit (25) is provided. But,
The centering pin (27) formed on one casing part (172) and the other casing part (171)
And a centering recess (26) formed in the center of the centering recess (26) for circumferentially engagingly receiving the centering pin (27). In order to center the casing parts (171, 172) directly in the radial direction, one casing part (171) is replaced with the other casing part (172).
A coaxial centering tube piece (2
2), the centering tube piece (22) having an outer circumferentially extending mating face (23), the other casing part (172) rotating relative to each other. Forming members (24) are arranged at angular intervals, and the forming members (241) are arranged inside the arc section (24).
1) is fitted onto the fitting surface (23) by precision fitting, and at least one molding member (24) has side walls (242, 243) located to face each other in the circumferential direction, Electrical machine, characterized in that the side walls (242, 243) receive between the side walls a projection (16) of the central slice (14) in a substantially engaging connection. 2. Machine according to claim 1, wherein the molding member (24) is cast in one piece into the casing part (172). 3. The central thin piece (14) has an annular supporting surface (15) extending in the circumferential direction, which protrudes from the peripheral surface of the stator thin plate assembly (10), and the supporting surface (15) has a protrusion. (16) is molded such that the central thin piece (14) comes into close contact with the support surface (15) under the pressure of the tightening screw (18) and contacts the annular end surfaces of both casing parts (171, 172). The machine according to claim 1 or 2, which is: 4. A through hole (20) for a tightening screw (18).
4. Machine according to claim 3, characterized in that it lies, at least in part, in the area of the bearing surface (15) of the central slice (14). 5. The centering pin (27) of the centering unit (25) comprises one molding member (2) in the axial direction.
Machine according to any one of claims 1 to 4, which extends from the end face of (4) into the centering recess (26) of the other casing part (171).