Motor-driven throttle valve control device having inductance-based noncontact rotation angle detecting device, and rotation angle detecting device used for the same

A motor-driven throttle valve control device having high reliability and resistance to electrostatic noise from the gear cover connector is obtained by compactly forming an inductance-based noncontact rotation angle detecting device at the end of the throttle shaft 3. In the present invention, an excitation conductor 18 is attached to the tip of the throttle shaft 3 to which the throttle valve 2 is attached. The gear cover 26 is provided with a magnetic field exciting conductor 28 and a signal detection conductor 29 to face the excitation conductor. Further, an insulating member is arranged between the rotating shaft (throttle shaft 3) and the magnetic field exciting conductor 28 and signal detection conductor 29. With this configuration, a motor-driven throttle valve control device having an inductance-based noncontact rotation angle detecting device, not affected by electrostatic noise and having high reliability, is realized.