Robert Boschgmbh

Istvan Ragaly

Alexander Shendi

Hans-Peter Groeter

Klaus Winkler

Manfred Frister

Walter Kohl

Walter Hagenlocher

Klaus Heyke

Peter Pfeffer

Juergen Lechner

Gunter Schmidt

Jorg Streller

Werner Eschen

Lutz Rapp

Alan Syrop

Johann Weigand

Sylvain Briand

Heinz Scharpf

The electric machine, particularly a three-phase generator, has an exciter machine ( ) in the form of a claw pole machine which supplies the exciter current necessary for the generator. The exciter machine is located to the side of the generator and has substantially smaller dimensions than the latter. At claws ( ) of the stator ( ) which face the armature ( ) of the exciter machine, permanent magnets ( ) are located in the leakage flux area between the claws. Unwanted leakage fields are contained in this way.

Electric machine, especially a three-phase generator, with an exciter

The electrical machine, in particular a three-phase generator, has a stator (,) secured in a housing (,) and a claw pole rotor (,) which is secured on a shaft (,) and has an exciter winding (,). Between the claw pole rotor and a bearing plate (,) that closes off the housing, there is an electrical repeater (,) for exciting the exciter winding (,). The primary winding (,) is disposed along with the core (,) on the bearing plate (,). The primary and secondary windings (,) of the repeater (,) are disposed between the bearing plate (,) and the claw pole rotor system (,); the primary winding (,) is disposed in a stationary core (,), and the secondary winding (,) is disposed in a rotating core (,), and the windings are coupled via an air gap (,).

Alternator with exciting means arrangement

A synchronous machine formed as a generator for a motor vehicle has a stator, a rotor, an excitation system composed of a plurality of electrically excited individual poles provided in the stator and the rotor and formed as claw poles excited by a joint excitation coil, and a stray field compensation device arranged in free spaces between the claw poles, the stray field compensation device being formed as an additional winding through which current flows and which surrounds the claw poles so that an axial current direction changes from one free space to another free space and a current to neighboring claw poles produces an additional flux which supports a main flux and counteracts a stray flux.

Synchronous machine, in particular generator for a motor vehicle

The claw pole generator includes a drive shaft, two field spider halves (30.1, 30.2) mounted on the drive shaft, each of which include a disk-shaped plate (15) and claw-shaped magnetic pole elements (17) mounted on the disk-shaped plate (15), so that the magnetic pole elements (17) of each field spider half are engaged with each other, and a number of permanently magnetic pieces (27), each of which is arranged between adjacent magnetic pole elements (17). The disk-shaped plate (15) of at least one field spider half (13.1,13.2) is provided with a number of grooves (21), each of which extend in the plate (15) in a longitudinal direction of the drive shaft (5) and have an undercut (25). Each permanently magnetic piece (27) has a section which corresponds in shape to or which fits into one of the grooves (21), so that the permanently magnetic pieces (27) are insertable in respective grooves (21) and radially securable therein.

Claw pole generator

A claw pole generator has a drive shaft, two pole wheel halves arranged on the drive shaft and each having a disk-shaped plate and claw shaped magnet poles spaced from one another in a peripheral direction and having magnet pole tips, the magnet poles of one pole wheel half being inserted in intermediate spaces of the magnet poles of the other of the pole wheel halves, permanent magnet parts provided for a dissipation flux compensation and arranged in intermediate spaces of the plate, the magnet poles extending in a predetermined direction, and a mounting device connecting the magnet pole tips with a neighboring one of the plates, the magnet poles extending toward an outer edge of a neighboring one of the plates, the mounting device having vanes operating as an ventilation element.

Claw pole generator with ventilation fan supporting the magnetic pole

A synchronous machine, in particular a generator for a vehicle, has an excitation system with a plurality of electrically excited individual poles in a rotor, preferably in form of claw poles excited by at least one common excitation coil, in which for compensation of a magnetic stray flux, in the free spaces between the axially oriented claw poles permanent magnets are inserted at the axial ends of the pole plates of the rotor, so that the permanent magnets are supported by a holder against centrifugal forces and held by it, and therefore an especially simple and inexpensive holder is formed which considerably simplifies and facilitates the insertion of the permanent magnets.

Synchronous machine, in particular generator for motor vehicle

Electric machine with means for guiding cooling air supplied from

Stator support for electric machine

Operating noise of a dynamo electric machine, and particularly a three-phase vehicular-type alternator, can be reduced by changing the reluctance or permeability of the magnetic path between rotor and stator of adjacent stator teeth by splitting the stator teeth to introduce additional radially extending gaps in the stator teeth or by distributing, non-uniformly or uniformly, ferromagnetic slot closers about the circumference of the stator slots while leaving, adjacent a stator slot with a magnetic closer, open stator slots or slots covered only with non-magnetic slot cover elements, such as treated paper, cardboard, or the like. This changes the frequency of attraction between rotor and stator to a frequency range which is not humanly perceptible or annoying, for example falling below the frequency range at which the alternator can operate, for example below idling speed of an internal combustion engine driving the alternator, or towards a frequency range so high that the operating noise level of the internal combustion engine masks any generator noise.

Dynamo electric machine with low-noise operating characteristics

To facilitate manufacture and increase the lifetime of a speed-dependent coupling between the ventilation or fan wheel (23) and drive shaft (18, 21) of the alternator, an inner race (25) is secured to the drive shaft, formed with two parallel running grooves (26, 27) in which two rows of balls (28, 29) are rolling. A pair of outer races is formed as ring-shaped elements (30, 31), of part-circular cross section, surrounding opposite, at least approximately quarter-circular zones of the balls, the outer races being axially biased towards each other by a pair of disk-shaped membranes (34, 35) to which the ventilation fan wheel (23) is attached, the membranes being biased towards each other by a biasing force (F), for example exerted by axial screws, securing the disk-shaped membranes together for resiliently biasing the ring-shaped elements towards each other and exerting axial pressure on the balls (28, 29) running in the grooves of the inner race and beneath the outer races. Sealing strips (50, 51, 52) can be placed between the membranes to prevent escape of lubricant of the coupling.

Forced air-cooled vehicular-type alternator

A wire conductor embedded in a circuit board for interconnecting rectifier diodes passes through a cut-out of the circuit board and is bent out of the cut-out beyond the surface of the circuit board so as to provide a U-shaped connection piece in which the end of a generator winding wire can be laid and clamped until it is soldered. The U-shaped connection piece can also be provided by a clip affixed to the embedded wire where it is accessible in a cut-out of the circuit board.

Alternator-rectifier unit with economical connections to wires embedded

A three-phase alternator having a fan wheel (23) mounted with ball bearing (17) on the rotor shaft (18,21). The fan wheel, which is free to rotate about the rotor shaft, is coupled to it by a coupling between the V-belt pulley (22) and the fan wheel, which employs a few spaced ball bearings (24,25,26;27,28,29) and support a spring washer (32,36,39,40) which presses against outer races of the bearings and the fan wheel.

Three-phase alternator with a positive non-flexibly coupled fan wheel

A normally lubricated bearing, typically a ball bearing, serves to transmit torque from a drive shaft for the fan wheel of an alternator. The driving and driven bearing surfaces form the coupling parts respectively on the drive side and the delivery side of the coupling. A cup spring is useful to control the bearing friction that must be overcome at a limiting speed at which the drive shaft begins to turn faster than the driven device. Such couplings are useful for engine fans, pumps, or other similar auxilary devices in motor vehicles.

Speed limiting rotary coupling

To improve the stability and robustness of a rectifier and to protect it against atmospheric influences, two plate-like, series-connected semiconductor diodes are soldered to a common tap electrode between them. An external lead wire is soldered to each of the remaining sides of the diodes. The entire soldered structure is embedded in a single mass of resin or plastic, the ends of the electrodes being configured to serve as anchoring elements in the plastic mass.

Two-element semiconductor diode rectifier assembly structure

A semiconductor element, either a diode or a controlled rectifier, is electrically insulated relative to the heat sink on which it is mounted by either an insulating layer or an insulating diode of high thermal conductivity. A single unit including the heat sink with a plurality of diodes is used as a bridge rectifier in single phase or polyphase circuits.

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Schwieberdingen, Germany

Istvan Ragaly