Shift register for controlling the energization of a multiwinding motor

Abstract From the Canadian patent

Abstract of the Disclosure A shift register is described particularly adapted for selectively controlling the energization of the windings of a stepping motor so as to provide selective overlapping phase energization. The shift register consists of four stages each having master and slave sections with each stage controlling the energization of an associated motor winding. A shift register control unit responsive to stepping and, directional signals directs the shifting of information, between the various stages of the shift register. In response to a step high input signal, a high level of one shift register stage is shifted in a selected direction to the adjacent stage with both stages …