Abstract: An electric motor having a stationary shaft carrying two spaced-apart bearings rotatably supporting a rotor. The shaft has an axial bore communicating with a radial slot in the shaft. An elongated locking member extends from the bore, through the slot, and into operative engagement with one of the bearings. A plug within the bore holds the locking member in place. A collar surrounds the shaft in the region of the slot, the locking member fixing one end of the collar against said one of the bearings. A compression spring surrounding the shaft presses against both the collar and the other of the bearings. The bore merges with the slot along an inclined surface which guides one end of the elongated locking member through the slot as the locking member is advanced along the bore during assembly.

Abstract: An electric motor having a stationary shaft carrying two spaced-apart bearings rotatably supporting a rotor. The shaft has an axial bore communicating with a radial slot in the shaft. An elongated locking member extends from the bore, through the slot, and into operative engagement with one of the bearings. A plug within the bore holds the locking member in place. A collar surrounds the shaft in the region of the slot, the locking member fixing one end of the collar against said one of the bearings. A compression spring surrounding the shaft presses against both the collar and the other of the bearings. The bore merges with the slot along an inclined surface which guides one end of the elongated locking member through the slot as the locking member is advanced along the bore during assembly.

Abstract: A stepper motor having a stator and a rotor, the rotor having a shaft formed with an axial bore. A pair of bearings carried by the stator rotatably support the shaft. A stud is fixed within the bore and has an enlarged head extending radially beyond the external contour of the shaft into axial alignment with at least part of one of the bearings. Engagement between the stud head and the bearing limits axial movement of the rotor with respect to the bearing.

Abstract: A rotor includes an annular hub for accommodating a motor shaft, a tubular permanent magnet around the hub and radially spaced from it, and an annular support between the hub and magnet, the support being bonded to the hub and magnet. The support, a single piece of thin sheet metal, has inner and outer tubular walls, joined at corresponding ends by a disc-shaped bridge.

Abstract: A stepper motor including a pair of annular stator plates each having a plurality of poles surrounding a central opening, the plates being fixed to each other in back-to-back relation, and a pair of annular stator cups each having a plurality of poles surrounding a central opening and a peripheral side wall. The stator cups are arranged over opposite faces of the joined-together stator plates with the poles of each stator cup interleaved with the poles of its respective stator plate. The peripheral edges of the stator plates are separated from each other to define a gap between them, and the free edges of the stator cup side walls are bent into the gap to mechanically join each stator cup to its respective stator plate.

Abstract: A stationary disc of electrically insulating material is sandwiched between two rotating discs of electrically insulating material, the rotating discs carrying electrical contacts and the stationary disc carrying electrical brushes engaging the electrical contacts.