Control device for electric cars including scr short circuiting of a starting resistance

Claim 1

A CONTROL DEVICE FOR ELECTRIC CARS COMPRISING, A DRIVING DC MOTOR, RESISTOR IN SERIES WITH SAID DC MOTOR AND HAVING A PLURALITY OF SERIES SECTIONS FOR POWER RUNNING AND DYNAMIC BREAKING, A CURRENT REGULATOR INCLUDING A FIRST SILICON CONTROLLED RECTIFIER ELEMENT CONNECTED TO PASS CURRENT THROUGH SAID DC MOTOR AND A SECOND SILICON CONTROLLED RECTIFIER ELEMENT CONNECTED TO CUT OFF SAID FIRST SILICON CONTROLLED RECTIFIER FOR REGULATING THE CURRENT THROUGH SAID DC MOTOR BY VARYING THE CONDUCTION PERIOD OF SAID FIRST SILICON CONTROLLED RECTIFIER ELEMENT, MEANS TO GENERATE FIRST GATE PULSES REPEATING AT A PREDETERMINED FREQUENCY, SUPPLIED TO SAID SECOND SILICON CONTROLLED RECTIFIER ELEMENT, AND MEANS TO GENERATE SECOND GATE PULSES SUPPLIED TO SAID FIRST SILICON CONTROLLED RECTIFIER ELEMENT BETWEEN THE REPETATIVE FIRST GATE PULSES TO CONTROL THE INSTANCE OF OCCURRENCE OF SAID REPETATIVE GATE PULSES IN ACCORDANCE WITH THE MAGNITUDE OF THE CURRENT THROUGH SAID DC MOTOR, SO THAT DURING POWER RUNNING, FIELD-WEAKENING CONTROL IS EFFECTED AND THE CURRENT REGULATOR IS FIRST CONNECTED IN PARALLEL WITH THE FIRST SERIES SECTION OF SAID RESISTOR THUS INCREASING THE CONDUCTION TIME OF SAID FIRST SILICON CONTROLLED RECTIFIER ELEMENT TO GRADUALLY SHUNT SAID FIRST SERIES SECTION, AND THEN UPON COMPLETION OF SHUNTING OF THE FIRST SERIES SECTION THE REGULATOR IS CONNECTED ACROSS THE NEXT SERIES SECTION TO REPEAT THE SHUNTING PROCESS TO ULTIMATELY CONNECT SAID CURRENT REGULATOR IN PARALLEL WITH THE FIELD WINDING OF SAID DC MOTOR, WHILE DURING DYNAMIC BREAKING SAID SERIES SECTIONS ARE SUCCESSIVELY SHUNTED IN THE SAME WAY AS DURING THE POWER RUNNING.