Patent ID: 7141897

Claim:
An electric actuator, comprising: a motor ( 1 ) for driving said electric actuator; a screw cylinder ( 3 ) for connecting a shaft of said motor ( 1 ) to a connecting part ( 5 ) and for surrounding the external surface of said motor ( 1 ), said screw cylinder having right-handed and left-handed screw recesses ( 4 ) formed thereon and having first and second ball screw nuts ( 6 and 9 ), said first ball screw nut ( 6 ) having a first electronic brake ( 8 ) mounted thereon and said second ball screw nut ( 9 ) having a second electronic brake ( 7 ) mounted thereon, thereby enabling a non-stop reciprocating linear movement; and an outside cylinder ( 2 ) provided with thrust bearings ( 11 ) that are in contact with said first and second ball screw nuts ( 6 and 9 ) and provided with a sensor ( 13 ) that are disposed on the surface of a fixed part ( 16 ) thereof for measuring the movement distance of said screw cylinder ( 3 ), thereby enabling said first and second electronic brakes ( 8 and 7 ) to control the operations of said first and second ball screw nuts ( 6 and 9 ).