Circuit for driving the pulse motor

Claim 1

A circuit for driving a multiphase pulse motor in response to a control signal from a generator therefor comprising for each pHase of said motor: an exciting coil, means including a first switching element for coupling with a first terminal of said coil to a high voltage source, means for coupling said first terminal to a low voltage source, a second switching element coupled between a second terminal of said coil and a reference potential, a signal path coupled between said generator and said first switch element which includes means for controlling said first switching element, a changing circuit coupled between said generator and said second switching element for controlling said second switching element, and a detector circuit coupled between said means for controlling said first switching element and said second switching element, said signal path and said changing circuit initially causing said first and second switching elements to be conductive in response to the beginning of said control signal, whereupon an exciting current flows solely from said high voltage source through said coil, thereby decoupling said low voltage source from said first terminal thereof, until it reaches a predetermined value at which said detector circuit causes said controlling means in said signal path to cut off said first switching element, which thereby cuts off the current from said high voltage source whereupon said coil is traversed solely by current from said low voltage source until the end of said control signal at which time said second switching element is cut off and said low voltage current no longer flows through said coil.