Minebea Mitsumi Inc.

Juichi Uno

Jumpei Fujii

A rotation detection device includes: a first comparator configured to generate a first digital signal that indicates a magnitude relationship between a first voltage, which is output from a potentiometer in accordance with an amount of rotation of a rotating body, and a threshold voltage; a second comparator configured to generate a second digital signal that indicates a magnitude relationship between a second voltage, which is obtained by dividing the first voltage, and the threshold voltage; and a controller configured to detect a direction of rotation and a number of complete turns of the rotating body based on transition edges of the first digital signal and transition edges of the second digital signal. By this means, even when the rotating body rotates while not being driven, it is possible to detect the number of complete turns of the rotating body.

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Nagano, Japan

Juichi Uno