초록 ▼

A limited angle torque motor and control circuit are adapted to convert an electrical demand signal of varying magnitude into a motor shaft position relating to the magnitude of the demand signal. More particularly, a bidirectional motor is provided having two stator coils wound in phase opposition,

A limited angle torque motor and control circuit are adapted to convert an electrical demand signal of varying magnitude into a motor shaft position relating to the magnitude of the demand signal. More particularly, a bidirectional motor is provided having two stator coils wound in phase opposition, so that the torques produced by the currents in the opposedly wound coils are summed such that the coil having the greater current controls the direction of rotor rotation. A position sensor provides feedback of the present shaft position; the magnitude of the feedback signal being indicative of motor shaft position. Finally, an electronic control circuit which is responsive to both the demand signal and the shaft position signal is provided and has two outputs for simultaneously driving the current in each respective stator coil. A summing means is included in the control circuit for combining the shaft position signal and demand signal so as to produce an error signal. The error signal, in turn, is input to a modulator that creates a differential between the two control circuit outputs to drive the two stator coil currents, thereby causing the motor shaft to rotate toward the desired shaft position.

대표청구항 ▼

A limited angle torque motor and control circuit for converting an electrical demand signal of varying magnitude into a motor shaft position relating to the magnitude of the demand signal, comprising in combination: a bidirectional motor having at least two stator coils wound in phase opposition so

A limited angle torque motor and control circuit for converting an electrical demand signal of varying magnitude into a motor shaft position relating to the magnitude of the demand signal, comprising in combination: a bidirectional motor having at least two stator coils wound in phase opposition so that torques produced by currents flowing in the opposedly wound coils are summed such that the coil having the greater current controls the direction of rotor rotation; means for producing a shaft position signal having a magnitude indicative of motor shaft position; and an electronic control circuit responsive to the demand signal and the shaft position signal and having two outputs for concurrently controlling the currents flowing in the respective stator coils, the control circuit including a modulator for producing a differential between the two outputs adequate to cause the motor shaft to rotate to the desired shaft position.