Showa Corporation

Kiyokazu Okado

Hiroyuki Muto

Yohei Hama

Tsukasa Suzuki

A sensor unit includes a collector and a sensor housing. The collector faces a stator guiding a magnetic flux, with a void between the collector and the stator, and collectively attracts the magnetic flux guided by the stator. The sensor housing has a wall covering outside of the collector, and holds the collector. A clearance is formed between an opposite surface of the collector to a surface thereof facing the stator, and the wall of the sensor housing.

Sensor unit, torque detector, and electric power steering device

Disclosed is a relative angle detection device for detecting a relative angle between a first rotary shaft and a second rotary shaft, the relative angle detection device being provided with a first magnetic field sensing unit which outputs a value according to a magnetic field of a magnet, a second magnetic field sensing unit which outputs a value according to the magnetic field of the magnet and outputs a value different from the output value of the first magnetic field sensing unit even if being placed in the same magnetic field as that of the first magnetic field sensing unit, a correction unit which corrects one output value out of the output value of the first magnetic field sensing unit and the output value of the second magnetic field sensing unit in accordance with an amplitude ratio between magnetic field components orthogonal to each other in the magnetic field of the magnet, and a computing unit which computes the relative angle between the first rotary shaft and the second rotary shaft on the basis of the one output value corrected by the correction unit and the other output value different from the one output value. Consequently, a technique capable of detecting the relative rotation angle with high accuracy is provided even if magnitudes of amplitudes of magnetic field components orthogonal to each other in the magnetically sensitive surface of the magnetic field sensing unit are different from each other.

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Haga-gun, Japan

Kiyokazu Okado