Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-03-27
2000-08-22
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310216, 310180, 310254, 310258, 310259, 310208, 29596, 29598, H02K 106, H02K 112, H02K 300, H02K 1504
Patent
active
061077186
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a stator for an electrical machine, in particular for a starter motor in motor vehicles.
In a known stator of this type (German Patent Disclosure DE 19 08 323 A1), the exciter winding wrapped randomly around the poles is shaped into a self-contained curved coil with axially parallel soil segments and two electrical coil terminals. The semicircular end windings that connect the axially parallel coil segments rest in recesses on the face ends of the poles, so that the axial length of the coil is practically the same as the axial length of the yoke or pole ring. The space between the successive poles is completely filled by the axially parallel coil segments. In the production of a random coil, the point of departure is a circular-annular coil, which is conventionally armored and bent to form the random coil. The poles are detachably connected to the yoke. When the stator is assembled, first only every other pole is connected to the yoke, and the random coil is inserted after that, with every other end winding of the coil inserted into recesses on the faces ends of the poles. After that, the remaining poles are placed in the yoke and displaced axially until the recesses on their face ends fit over the remaining end windings.
SUMMARY OF THE INVENTION
The stator according to the invention has the advantage that because individual round-wire conductors are used, there is greater freedom in terms of the shape of the exciter winding. The pole core can be made higher, and hence the winding can be distributed more uniformly, without such a pronounced axial length. Because the individual round wires are twisted inside a bundle conductor that forms a winding, the coil becomes more solid, making it stiff and stable enough to be manufactured outside the stator and then inserted into the yoke. The exciter winding of the invention has on only slightly lower coupling factor than an exciter winding in which the exciter poles have round wire wound directly onto them, with a marked advantage in terms of production because of being prefabricated outside the yoke. In addition, the effort and expense for interconnecting a random winding that has only one beginning of a winding and one end of a winding is markedly less than for directly wound exciter poles, where all the winding terminals of the individual poles require interconnection. Because the round wires on the outer face ends of the poles are adjacent and parallel to one another, the end winding overhang remains within acceptable limits and is only 1.5 to 1.7 times greater than in the case of direct winding-on of the exciter poles.
In a preferred embodiment of the invention, the twisting of the round wires between two successive poles is done at a rotary angle of 180.degree. or an integral multiple of 180.degree.. At a rotary angle of 180.degree. or an odd-numbered multiple of 180.degree., the adjacent round wires on the face ends of successive poles change places in successive poles, while at a rotary angle of an even-numbered multiple of 180.degree., they keep the same position on all the poles. Twisting the round wires by 180.degree. already suffices to achieve adequate stiffness of the random winding and to allow its prefabrication outside the stator and subsequent insertion into the stator.
For technical reasons involving windings, in an advantageous embodiment of the invention, the twist of the round wires of a bundle conductor is embodied with the same rotary angle in opposite directions within two regions, immediately succeeding one another in the winding direction, between two poles, for example being 180.degree. clockwise in one such region and 180.degree. counterclockwise in the next.
In a preferred embodiment of the invention, the poles in progressive order are connected to the yoke permanently in one instance and detachably in the next, and the yoke and the poles are put together as a packet comprising a plurality of full-thickness sheet-metal stampings. Because of this structural provision, the loss of
REFERENCES:
patent: 3914859 (1975-10-01), Pierson
patent: 3983433 (1976-09-01), Sims
patent: 4071788 (1978-01-01), Martin et al.
patent: 4280275 (1981-07-01), Mitsui
patent: 4712035 (1987-12-01), Forbes et al.
patent: 4816710 (1989-03-01), Silvaggio et al.
patent: 4852246 (1989-08-01), Rochester
patent: 4857787 (1989-08-01), Taji et al.
patent: 5570503 (1996-11-01), Stokes
Franz Peter
Schustek Siegfried
Nguyen Tran N
Ramirez Nestor
Robert & Bosch GmbH
Striker Michael J.
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