BigPatents India

The present invention provides a linear-electromechanical actuator, said actuator comprising a motor with a hollow rotor and a stator housed in a covered body, a bearing housing disposed on both the ends of the covered body, angular contact ball bearings operably disposed in said bearing housing, a rotatable ballscrew-nut lock- integrated with the rotor, said ballscrew-nut having an internal thread profile, a tubular screw-guide with internal key-ways with shock absorbing means axially extending from the covered body, a hollow and non-rotating ballscrew-shaft having a linear motion and with a threaded outer profile axially extending towards the screw-guide and terminating with a plurality of linearly movable ballscrew locking keys, said locking keys disposed in the key-ways of the screw-guide to convert the rotary motion of rotor into linear motion of the ballscrew-shaft, said ballscrew-nut and ballscrew-shaft are thread integrated to each other, a tubular linear variable differential transformer (LVDT) with a non-contacting probe, said LVDT disposed in said non-rotating ballscrew-shaft, said probe acting as a sensor is directly connected to the ballscrew- shaft to sense the linear movement of the ballscrew-shaft and to provide a corresponding alternate current (AC) voltage output to an external electronic control unit, and an attenuation card in functional communication with LVDT is mounted on the screw-guide to adjust the scale factor of the sensor.