Servo Systems

Motor overheating is the leading cause of insulation degradation in servo motor windings. Accurate temperature monitoring — beyond simple binary PTC trip points — requires a continuous analog measurement model. The Steinhart-Hart equation provides an empirical model that converts thermistor resistance to temperature with the accuracy needed for predictive load management and cooling control.

Safe Torque Off (STO) replaces the mechanical redundant contactor as the hardware safety function for servo drives. STO implementations are rated by FMEA of the power stage circuitry. Current system design trends integrate STO, encoder feedback, and safety-rated fieldbus communication into a single drive-encoder safety system without a dedicated safety PLC.

Incorrect grounding in servo motor systems produces fault currents, EMI, and encoder signal noise that degrade position feedback quality. Understanding the functional role of each ground type — earth, chassis, and signal — is prerequisite to designing a reliable servo installation.