Importance

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Abstract

A feed roller rotation measurement system includes a voltage tuned oscillator (VTO) having a capacitor and an inductor coupled to each other. The VTO is configured to be disposed adjacent a shaped feature formed in a surface of a feed roller of a wire feeder. The feed roller rotation measurement system also includes a phase locked loop (PLL) controller electrically coupled to the VTO and configured to determine and send a correction voltage to the VTO to maintain the VTO at a desired oscillating frequency. The feed roller rotation measurement system further includes a processor coupled to the PLL controller and configured to receive a signal from the PLL controller indicative of the correction voltage and to calculate a speed of rotation of the feed roller based at least in part on the received signal.

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First Claim