Title:
ELECTRIC OPERATING MACHINE
Document Type and Number:
Japanese Patent JPS56127870
Kind Code:
A
Abstract:
PURPOSE:To prevent a damage of valve component elements caused by insertion of foreign objects therein by a method wherein an input voltage variable circuit is arranged at one terminal of an electric motor so as to control a restricting torque of the motor. CONSTITUTION:Input voltage variable circuit is arranged at one terminal end of the motor M and an output torque of the motor M may be adjusted. That is, the diac Di is operated only when an inter-terminal voltage in the capacitor C2 is kept constant, a pulse is applied to a gate terminal of a triac Tr to enable a normal or reverse rotation of the motor M. Therefore, it is possible to control a duration time required for the inter-terminal voltage of the capacitor C2 to be kept constant by varying a variable resistance VR and then a restricting torque or an energizing torque for the motor M is controlled. As a result, it is possible to prevent damage of the valve component elements when some foreign objects are inserted in the valve.
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Inventors:
KAZAMA YOUICHIROU
Application Number:
JP3004680A
Publication Date:
October 06, 1981
Filing Date:
March 10, 1980
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
F16K31/04; F16K31/02; (IPC1-7): F16K31/02