Abstract: A magnetizing type induction motor includes a conventional rotor enclosed within a novel stator. The stator has a pair of crescent-shaped pole pieces, the thickness of the stator pieces at their centers being larger than the thickness at the opposite edges thereof. These stator pieces are secured together by a pair of end cover plates which are provided with fitting grooves for receiving the stator pieces, and coupling pins are installed between the facing edges of the stator pieces. This magnetizing type induction motor is easily miniaturized and is not subject to frequent failures so that it can be reliably used in automated apparatuses.

Abstract: A brushless unequal-pole electric motor includes a cylindrical rotor formed at least partly of a permanent magnet and rotatably installed within a casing, a plurality of field magnetic cores installed within the cylindrical rotor, field coils wound around the field magnetic cores for magnetizing the cores, and position-detecting sensors for detecting the positions of the magnetic poles of the cylindrical rotor. The sensors are connected to driving circuits for reversing the magnetic fields, to cause the rotor to rotate. The field magnetic cores generate magnetic fields of different magnitudes between the adjacent field magnetic cores, and generate magnetic fields of the same magnitude as that of the oppositely located field magnetic cores. In an alternate embodiment, the field magnetic cores surround the rotor.