Method of assembling rotor of stepping motor

Details Method of assembling rotor of stepping motor Method of assembling rotor of stepping motor

1978-12-07

1982-03-16

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

310 42, H02K 1502

Patent

active

043193986

ABSTRACT:
The rotor of a stepping motor is formed of a shaft, a cylindrical magnet, first core pieces having an inside diameter substantially equal to the diameter of a rotor shaft and having a number of teeth on the periphery and second core pieces having an inside diameter substantially equal to the outside diameter of the magnet and having a peripheral contour similar to that of the first core pieces. A cylindrical jig is provided having ribs longitudinally formed on the inner peripheral wall which guide the teeth on the periphery of the ring-shaped core pieces. A predetermined number of the first and second ring-shaped core pieces are stacked in succession, in the bottom of the jig and one end portion of magnet is then fit into the hollow of the stack of core pieces. A spring member is applied over the magnet either before or after insertion and thereafter a predetermined number of the second pieces on the opposite end portion of the magnet and a predetermined number of the first core pieces are fit over the other end of the magnet. Finally the rotor shaft is forced through the stacked groups of core pieces and the magnet, thereby assembling the shaft, core pieces, and magnet together. The spring member exerts an axial bias on the core pieces. The assembly is then removed from the jig and a bonding agent applied thereon.

REFERENCES:
patent: 3601640 (1971-08-01), Egawa et al.

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