Fanuc Corporation

Shouhei Nishino

Youhei Kondou

This encoder comprises: an encoder main circuit that is driven using an encoder main circuit driving voltage supplied from at least one internal power source to generate rotation information of a rotating element; an overvoltage breakdown prevention circuit that generates an abnormality detection unit driving voltage on the basis of a voltage supplied from a main power source; an abnormality detection unit that is driven using the abnormality detection unit driving voltage outputted from the overvoltage breakdown prevention circuit to detect an abnormality related to the internal power source; and a cut-off circuit that cuts off supply of the encoder main circuit driving voltage from the internal power source to the encoder main circuit upon detection by the abnormality detection unit of an abnormality.

Encoder having overvoltage breakdown prevention circuit

An encoder includes: a phase signal generator that generates and outputs first and second sinusoidal analog signals that are out of phase with each other by 90 degrees, according to a movement of a measurement target; a Lissajous angle calculator that determines a Lissajous angle from the first and second analog signals; and an amplitude adjustor that adjusts an amplitude of only the first analog signal output from the phase signal generator and outputs the adjusted amplitude to the Lissajous angle calculator.

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Yamanashi-ken, Japan

Shouhei Nishino