Patent ID: 6794779
Filing Date: 2004-09-21
Classification: F16H,H02K,Y10T

Abstract:
An electromechanical actuator that includes:a housing having an opening passing therethrough that is centered about an axis; a brushless servo motor having a rotor assembly mounted inside said housing for rotation about said axis, said servo and a stator encircling the rotor assembly motor rotor containing a permanent magnet and said stator containing the motor windings; a tapered circular wedge tightly wedged between the stator and the inner wall of the housing within a tapered portion of said housing opening to stationarily support the stator within the housing; a bail screw shaft aligned along the axis and having a tapered end that is tightly secured within a complementary tapered hole in said rotor assembly of said servo motor so that said shaft extends outwardly beyond one end of the rotor assembly; a ball screw nut mounted upon the extended end of said shaft so that said nut moves axially along the shaft as the shaft is rotated by said motor; a pushbar unit slidably contained within an end wall of said housing said pushbar unit being connected to said ball screw nut for movement along said axis, and control means connected to said motor for activating the motor to advance or retract the push bar a desired linear distance.