CROSS REFERENCE TO RELATED APPLICATION

The present disclosure is based on Japanese Patent Application No. 2018-147607 filed on Aug. 6, 2018, the whole contents of which are incorporated herein by reference.

FIELD

The present disclosure relates to a rotation detection device and an electric power steering apparatus using the same.

BACKGROUND

A rotation angle detection device, which detects information varying with a rotation of a motor, is known conventionally. For example, information related to a rotation angle and information on the number of rotations respectively calculated by a rotation angle sensor are transmitted to a control unit so that the control unit calculates a steering angle based on the rotation angle and the number of rotations.

SUMMARY

A rotation detection device according to the present disclosure comprises plural sensor units and a control unit. Each sensor unit includes at least one detection element for detecting a rotation of a motor and outputs first rotation information related to a rotation angle in one rotation of the motor and second rotation information related to a number of rotations of the motor. The control unit includes a signal acquisition unit for acquiring the first rotation information and the second rotation information from the sensor unit, and an absolute angle calculation unit for calculating an absolute angle indicating a rotation amount from a reference position based on the first rotation information and the second rotation information.

