Control system for D.C. electric motor
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsNobuo Anzai, Eiki Watanabe
Life of this patent
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Abstract
A control system for a D.C. electric motor utilizing a Ward-Leonard rotation speed control system in which noise components in the input power to the motor are substantially eliminated. Switching means in the form of gate turning-off thyristors couples a delta-connected capacitance circuit to the input line to the motor between inductors coupled in series with each phase of the input line. Switching means is provided which is opened after a predetermined time delay from the firing time of the thyristor converter. The time delay is preferably approximately one-fourth of the system natural oscillation period.
Claims5
A control system for D.C. electric motors comprising:
- a thyristor converter;
- a gate control circuit for controlling a firing point of said thyristor converter;
- capacitor means connected through resistor means to an input side of said thyristor converter;
- and switching means connected in parallel with said resistor means, said switching means being opened after a predetermined time delay from said firing point of said thyristor converter.
Dependencies are inferred from the claim text.