Abstract: A squirrel-cage induction motor for frequency converter operation includes a rotor which has a rotor core with a plurality of substantially axially extending rotor slots in which rotor conductors are arranged, each rotor slot having a main portion in which a rotor conductor is arranged and a slot opening arranged between the main portion and that surface of the rotor facing the air gap of the motor, and a magnetic bridge arranged to separate the slot opening from the main portion of the slot, wherein the ends of the magnetic bridge adjoin the rest of the rotor core on either side of the slot opening, and the portion of the bridge opposite to the ends extends into the main portion of the slot.

Abstract: A pendulum roller head for a resistance seam-welding machine is described, having a sliding contact current transmission device between a stator and a rotor, which device is composed of an annular disc which extends radially between rotor and stator, is fastened by its outer circumference to the stator, carries an axial sliding contact ring on its inner circumference, and is flexibly designed in its bridging part between the inner and outer circumferences. The sliding contact disc is composed of a copper braid to which the axial sliding contact ring is fastened. The sliding contact current transmission device in the form of the disc with a flexible bridging part replaces the current transmission device in the form of fluid metal which has formerly been in use in pendulum roller heads.

Abstract: A separately-excited fractional-horsepower electric motor in which a field coil is connected to one of the brushes by means of a brush retainer which is formed with a plug portion such that, on fitting the brush retainer to the brush holder, the plug portion penetrates and engages a socket connected to the field coil.

Abstract: A linear motor provides stepwise, incremental advance of a moveable output member. First and second, spaced latches are movably coupled to the output member. A selectively energizible driver engages and moves the first latch into fixed engagement with the output member and continues to move the engaged first latch and output member a predetermined incremental advance distance. The second latch is biased to retain the output member in each successive incremental advance position while the first latch is being reset. In one embodiment, the driver is a solenoid having a movable plunger operably coupled to the first latch. In another embodiment, the drive is a motor having a rotatable output shaft with an eccentric cam mounted thereon. The eccentric cam engages the first latch to move the first latch into fixed engagement with the output member and to advance the fixedly engaged first latch and output member an incremental advance distance.