Patent ID: 7262594
Filing Date: 2007-08-28
Classification: G01D

Abstract:
1. A rotation angle detector comprising: a rotator; a first detecting rotator rotative in combination with the rotator; a first magnet attached in a center of the first detecting rotator; a first anisotropic magnetoresistive element including: an amplifier connected to the first anisotropic magnetoresistive element, the amplifier being configured to differentially amplify an output signal from the first anisotropic magnetoresistive element; and a controller connected to the amplifier, wherein one of the first positive output terminal and the first negative output terminal is a first output terminal, the controller connects the first output terminal to a ground so as to detect a presence or absence of a short circuit between the first positive output terminal and the first negative output terminal, and when there is no short circuit, the controller releases connection from the first output terminal to the ground, thereby detecting a rotation angle of the rotator based on a signal outputted from the amplifier in accordance with the output signal of the first anisotropic magnetoresistive element.