Plural motor control for a locomotive with anti-slip and load distribution

Claim 1

A CONTROL FOR A PLURALITY OF ELECTRIC SHUNT WOUND D.C. MOTORS OF A TRACTION VEHICLE, COMPRISING AN EXCITATION SYSTEM FOR EACH OF SAID MOTORS OPERABLE TO CONTROL THE FIELD CURRENT OF SAID MOTOR AND HAVING A PLURALITY OF INPUTS AND VARYING SAID FIELD CURRENT AS A FUNCTION OF SIGNALS APPLIED TO SAID INPUTS, MEANS CONNECTED TO FIRST INPUTS OF ALL OF SAID EXCITATION SYSTEMS FOR VARYING THE FIELD CURRENT OF ALL OF SAID MOTORS SIMULTANEOUSLY, WHEREBY THE SPEED OF ALL OF SAID MOTORS IS INCREASED WHEN SAID SIGNAL TO SAID FIRST INPUTS IS IN A DIRECTION TO WEAKEN FIELD CURRENT, MEANS CONNECTED TO SECOND INPUTS OF ALL OF SAID EXCITATION SYSTEMS FOR BALANCING THE ARMATURE CURRENTS OF SAID MOTORS, MEANS RESPONSIVE TO THE WEIGHT CARRIED BY SELECTED WHEELS OF SAID VEHICLE AND BEING COUPLED TO A THIRD INPUT OF THE ENERGIZATION SYSTEM ASSOCIATED WITH THE MOTOR WHICH DRIVES SAID SELECTED WHEELS FOR GENERATING A LOAD DISTRIBUTION SIGNAL WHICH IS A FUNCTION OF THE CHANGE OF WEIGHT CARRIED BY SAID SELECTED WHEELS, SAID LOAD DISTRIBUTION SIGNAL GENERATED IN RESPONSE TO SAID REDUCTION IN WEIGHT ENERGIZING SAID EXCITATION SYSTEM TO INCREASE SAID FIELD CURRENT, AND MEANS RESPONSIVE TO A PREDETERMINED MAGNITUDE OF SAID LOAD DISTRIBUTION SIGNAL FOR DISABLING THE ARMATURE CURRENT BALANCING MEANS CONNECTED TO SAID SECOND INPUT OF THE EXCITATION SYSTEM ASSOCIATED WITH SAID SELECTED WHEELS.