Sony Corporation

Tamagawa Seiki Co., Ltd.

Asako Toda

Masayuki Katakura

Yuichi Takagi

Hiroshi Kushihara

A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle &#x3b8;(t) for detection, but a phase angle &#x3c9;ot&#xb1;&#x3b8;(t) having an offset of a frequency &#x3c9;ot in the phase lock units. For this reason, when the excitation frequency &#x3c9;ot is set sufficiently high with respect to the frequency of the angle &#x3b8;(t), the phase angle &#x3c9;ot&#xb1;&#x3b8; to be followed in the phase lock units will not become zero. For this reason, an angle having a high precision can be found in real time regardless of the configuration not including the conventional apparatus in which the configuration is complex and the power consumption is large like a bipolar VCO and an up/down type counter.

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Kanagawa, Japan

Asako Toda