Patent ID: 7298108
Filing Date: 2007-11-20
Classification: B25J,F16H,G05B,H02K,Y10T

Abstract:
1. A control system for an electric actuator having a movable member which is displaceable under a rotary driving action of a rotary driving source, said control system comprising: said electric actuator having said movable member which makes linear reciprocating motion under said driving action of said rotary driving source; a driver which energizes and deenergizes said rotary driving source equipped for said electric actuator; and a controller which outputs a direction instruction signal to said driver, wherein said electric actuator includes an actuator body, said rotary driving source which is connected to one end of said actuator body, a pair of guide shafts which extend in parallel between said actuator body and an end block, a feed screw shaft which is connected to a drive shaft of said rotary driving source, and said movable member which makes said linear reciprocating motion along said pair of guide shafts by screwing said feed screw shaft; and said driver is provided with a current-detecting means which detects a current supplied to said rotary driving source, a comparing means which compares a detection signal from said current-detecting means with a preset reference current, and a current limit means which, without cutting off supply of said current to said rotary driving soure, limits said current supplied to said rotary driving source so that said current does not exceed said reference current when a load is applied to said rotary driving source while maintaining an energized state and said drive shaft of said rotary driving source is stopped and restricted.