DIRECT DRIVE SERVOVALVE HAVING MOTOR POSITION SENSOR

摘要

A direct drive servovalve which includes as an integral part thereof, a motor rotor position sensor (46). The rotor position sensor (46) is used to generate an electrical signal which is representative of the degree of rotation of the rotor (52) from its null position. This signal is utilized in the feed back loop to accomplish control of the drive motor (18). The sensor (46) may include a HALL effect device (74) which is activated by the permanent magnets (70) utilized as a part of the rotor (52) of the drive motor or alternatively by a separate permanent magnet (78) which is mounted upon the rotor shaft (68) of the drive motor rotor (52). Alternatively, the position sensor (46) may include a potentiometer (80) which is mounted internal of the drive motor (18).