Apparatus for sequentially energizing windings

Claim 1

A CONTROLLER FOR USE WITH ELECTRIC APPARATUS HAVING FIRST AND SECOND WINDINGS FOR REGULATING THE FLOW OF CURRENT FROM A D.C. SOURCE TO SAID WINDINGS TO PROVIDE APPROXIMATELY SQUARE WAVE CURRENT PULSES SEQUENTIALLY TO SAID FIRST AND SECOND WINDINGS COMPRISING IN COMBINATION FIRST AND SECOND SWITCHING MEANS OPERABLE TO VARY THE CONDUCTIVITY OF AN ELECTRIC PATH THERETHROUGH, MEANS FOR CONNECTING SAID FIRST AND SECOND SWITCHING MEANS BETWEEN ONE SIDE OF SAID FIRST AND SECOND WINDINGS RESPECTIVELY AND ONE TERMINAL OF SAID D.C. SOURCE, MEANS FOR CONNECTING THE OTHER SIDE OF THE WINDINGS TO THE OTHER TEMINAL OF SAID SOURCE, MEANS FOR CONTROLLING THE CONDUCTIVITY OF SAID SWITCHING MEANS TO CAUSE SAID FIRST SWITCHING MEANS TO BECOME NONCONDUCTIVE AND SAID SECOND SWITCHING MEANS TO BECOME CONDUCTIVE AND MEANS FOR TRANSMITTING A VOLTAGE TRANSIENT, INDUCED IN SAID FIRST WINDING UPON THE CUTTING OFF OF CURRENT FLOW THROUGH SAID FIRST SWITCHING MEANS, TO SAID SECOND WINDING FOR INCREASING THE RATE OF CURRENT RISE IN SAID SECOND WINDING COMPRISES A FIRST DIODE, MEANS FOR CONNECTING SAID FIRST DIODE BETWEEN SAID ONE SIDE OF SAID FIRST WINDING AND SAID OTHER SIDE OF SAID SECOND WINDING ORIENTED TO PERMIT THE PASSAGE OF CURRENT RESULTING FROM SAID TRANSIENT THROUGH SAID FIRST WINDING SAID SECOND WINDING, AND SAID SECOND SWITCHING MEANS, AND A SECODN DIODE IN CIRCUIT WITH THE MEANS FOR CONNECTING SAID OTHER SIDE OF SAID SECOND WINDING TO THE POWER SUPPLY, SAID SECOND DIODE BEING ORIENTED TO BLOCK THE TRANSMISSION OF SAID VOLTAGE TRANSIENT THERETHROUGH TO THE POWER SUPPLY.