US PATENT SUBCLASS 318 / 631
.~ Antistatic friction features (e.g., "dither" voltage)

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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
631.~ Antistatic friction features (e.g., "dither" voltage)

DEFINITION

Classification: 318/631

(under subclass 560) Subject matter in which means are provided to eliminate static friction. Static friction is usually higher than running friction and has a deleterious effect on servo performance.

(1) Note. For example, by applying a low magnitude AC signal to the motor at all times, the rotor of the motor continuously vibrates at null to eliminate the static friction. The application of an AC signal is termed using a "Dither" voltage.