| 摘要 |
PURPOSE:To remove a ripple torque by constituting an apparatus from a cylindrical rotor, a sensor, a conduction control circuit for exciting coil, a chopper circuit, a servo system, means for previously setting the physical change of the outer peripheral surface of revolution of the cylindrical rotor, a multiplication circuit and an electric circuit using the output of the multiplication circuit as input voltage signal. CONSTITUTION:When exciting coils 17b, 17f are conducted, salient poles 1b, 1g are attracted to rotate in the direction of the arrow A-1. When the poles rotate by 90 degrees, the conduction of the exciting coils 17b, 17f is stopped and exciting coils 17c, 17g are conducted so that torque by salient poles 1c, 1h is generated. Coils 5a, 5b face the side faces of the salient poles 1a, 1b...so that position-transducing signals are obtained in like manner. When the coil 5a does not face the salient poles, a bridge circuit reaches equilibrium and there is no output from the output terminal 16 of an operational amplifier 15a. At the time of facing the salient pole, the impedance of the coil 5a decreases so that the output of the operational amplifier 15a comes to a high level. |
