Abstract: Magnetic drive device characterized in that it comprises a driving element moving in a guide element, and suitable to drive a driven element; the driven element is mobile along the guide element, in accordance with the movement of the driving element; the driving element acting on the driven element by use of magnetic means and without direct physical contact. The magnetic drive action of the driving element is induced by means of the use of permanent magnets or of electromagnets which act on the driven element.

Abstract: A rotor for a rotary electric machine includes a rotor core which is formed by crimping laminated steel plates so as to be opposed to a stator, and has pairs of magnet housing holes disposed in a V shape, and pairs of magnets housed in the magnet housing holes. The rotor core has a crimped portion formed in a q axis core portion positioned between the two magnet poles, which are adjacent to each other in a circumferential direction, a first flux barrier formed between the q axis core portion and the magnet, and a pair of second flux barriers which enlarges from an end positioned at a center side of the magnet pole of the magnet housing holes toward a central axis of the rotor core. The crimped portion is formed so that distances between the crimped portion and both the first and second flux barriers are equal.

Abstract: The invention reduces vibration in a plastic element used in an electrical drive. The plastic element has a baseplate, at least two commutator brush boxes leading to a shaft passage channel which passes through the baseplate, and a bearing seat which is connected to the baseplate via at least one supporting arm for holding a shaft bearing. The invention provides for the entire contact area of the supporting arm with the baseplate to be arranged at a lateral distance from the commutator brush boxes.

Abstract: The keybar that is attached to the frame of a dynamoelectric machine is broken into a bald keybar with mini-dovetails attached to it. The bald keybar is identical to the bolt portion of a conventional keybar. The mini-dovetail is a trapezoidal or U-shaped strip with insulated slanted arms. The core packet is inserted loosely over an array of mini-dovetails. Devices such as wedges, threaded rods flex the slanted arm and press them against the slot faces of the core packet, thereby locking the core packet to the frame. Insulation on the slanted arms prevents large eddy currents due to shorted laminations, increasing the machine efficiency. Preventing large eddy currents also eliminates hot spots which could otherwise cause a core failure. Locking the core packets also prevents rattling of laminations. The locking method also distributes the torque forces evenly around the periphery.