Direct current rotary apparatus

Claim 1

A direct current rotary apparatus, comprising a stator having four inwardly extending poles each having arcuate pole faces concentric with one another, a winding on each of said poles, a rotor having a shaft and two opposed magnetic poles, one always north and the other always south, rotatable within said stator, a commutator switch for the windings of said stator, said switch having two opposed rotatable substantially semicircular arcuate segments mounted on said shaft, two sliprings carried by said rotor and being connected to one and the other of said segments respectively, four relatively stationary brushes angularly spaced uniformly about and contacting the segments, and a first series connection between an opposite pair of brushes and two corresponding windings on opposite pair of brushes and two corresponding windings on opposite stator poles, and a second series connection electrically isolated from and independent of the first series connection between the other pair of brushes and the windings of the other two opposite poles said segments being oriented with respect to the poles of the rotor whereby the stator poles are switched to continually magnetically attract the rotor poles to provide continuous torque in one direction, said commutator switch having short segments between the arcuate segments of a circumferential width greater than the brushes, and a resistor interconnection said short segments.