The Superior Electric Company

Robert C Smith

Gary E Horst

A three-phase stepping motor having magnetically interacting stationary and moving members, the stationary member having first, second, and third sets of stator poles, each stator pole having thereon a coil for magnetic energization thereof. The coils on the first set of stator poles and one-half of the coils on the third set of stator poles are connected to one phase of a two-phase drive. The coils on the second set of stator poles and the other half of the coils on the third set of stator poles are connected to the other phase of a two-phase drive. The fluxes produced by the currents of the two drive phases are, in effect, magnetically combined in the moving member, as if the third set of poles wewre energized by a 'third phase'. In one embodiment, a twelve-pole, rotary, three-phase stepping motor with a 50-tooth rotor and a 48-, 50-, 52-, or variable-tooth-pitch stator produces a step angle of 1.8.degree. mechanical with a two-phase drive.

Winding for operation of a three-phase stepping motor from a two-phase

A three-phase stepping motor having first, second, and third sets of stator poles, with the first and second sets of stator poles having single coils thereon and the third set having dual or bifilar coils thereon. The coils on the first set of stator poles and one of the coils on each pole of the third set of stator poles are connected to one phase of a two-phase drive. The coils on the second set of stator poles and the other of the coils on each pole of the third set of stator poles are connected to the other phase of a two-phase drive. The currents of the two drive phases are thus magnetically combined in the third set of stator poles to produce energization of the 'third phase'. In one embodiment, a twelve-pole, rotary, three-phase stepping motor with a 50-tooth rotor and a 48- , 50-, or 52-tooth-pitch stator produces a step angle of 1.8.degree. mechanical with a two-phase drive.

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Hartford, CT, United States of America

Robert C Smith