Abstract: A rotary electric dynamo machine in which the ripple component in the output occurs at a higher frequency. One half of the pole faces have a nonuniform airgap while the other half have a uniform air gap and cover a noninteger slot distance. The armature has an odd number of slots. Instead of the usual ripple component at the slot frequency, a dynamo constructed as described above, surprisingly, has a predominant ripple component at twice the slot frequency.

Abstract: A circuit arrangement for the control of the series switching element of a clocked power supply unit has a pulse signal (Vt) delivered by a pulse generator. The pulse-interval ratio of the pulse signal can be varied as a function of a regulating signal (Vc) derived from the output side of the power supply unit and delivered by way of an optoisolator (13). The portion of the circuit employed as pulse generator (1) includes an operational amplifier (10) with feedback at both inputs. One feedback branch of the amplifier (10) contains at the amplifier input a capacitance (15) and a variable resistance. The variable resistance is formed by the parallel connection of a phototransistor (132) of an optoisolator (13) and an ohmic resistor (12). Accordingly, it becomes possible to produce a variation of the pulse-interval ratio of the pulse signal (Vt) either solely by modification of the pulse length or solely by modification of the pulse intervals.

Abstract: The present invention relates to a kinetic wheel arrangement comprising a stator and a rotor and magnetic bearings for magnetically suspending the rotor with respect to the stator. According to the invention, for the magnetic bearing parts connected to the stator, an elastic suspension system is provided which is rigid in a first direction parallel to the axis of rotation Z-Z of the rotor, rigid in a second direction V-V at right angles to the axis of rotation of the rotor and flexible in a third direction U-U at right angles to the two directions Z-Z and V-V. The invention is more particularly applicable to the accumulation of energy.

Abstract: The back EMF generated in armature coils is substantially balanced by causing the coils located a greater distance from the axis of rotation of the armature to have fewer turns than the coils located closer to the armature axis of rotation. Alternatively, rather than decrease the number of turns in the coils, the same balancing affect can be achieved by increasing the electrical resistance of the coils located a greater distance from the armature axis of rotation.

Abstract: A molded commutator is made up of segments arranged in a ring with their brush contact surfaces facing inwardly and forming a cylindrical shape. A matrix of plastic is molded between and around the outside of the segment ring in order to separate the segments electrically and to hold them in the ring configuration. A reinforcing metal casing serves to contain the commutator against breaking up due to centrifugal forces experienced during rotation. An alternate embodiment uses metal bands embedded within the matrix for this purpose.

Abstract: To provide for effective lubrication of a vehicular-type alternator, the bearings (2, 4) positioned at the respective end plates (1, 5) are pressure-lubricated. An oil pressure supply duct (21) is directed towards the rear bearing (4) which is positioned within a chamber (23), the chamber communicating with the central longitudinal bore (24) extending through the shaft towards the drive bearing (2). The drive bearing is positioned within a second chamber (26, 29) and radial bores (25) extend from the central bore (24) in the shaft into the drive side chamber, the drive side chamber being connected to a drain duct 30. To provide communication between the end faces of the bearings, a sickle-shaped recess extends partially circumferentially around the outer race of the respective bearing in the zone of termination of the ducts (21, 30), and having an axial length longer than the respective outer race (34) of the bearing.

Abstract: An electric motor having a hook-shaped commutator about which more than one coil wire per hook is wound with the coil wire making contact with the commutator segment has a hook formed at the winding end face of a commutator segment, the hook base extending below the outer surface of the face, the hook being bent in the direction of a depression which corresponds to the diameter of a first coil wire formed between the hook and the face of the segment and is located at the outer edge of the face so that when a second coil wire is inserted it will necessarily be located in direct contact with the hook and radially above the first wire which will lie, at least in part, below the outer surface of the face.