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  • Dc motor impersonators
    Special algorithms make ac induction motors respond like variable-speed dc motors for fast PID control. The rotating speed of ac induction motors is determined by the frequency of ac applied to the stator, not the applied voltage. However, stator voltage must also drop to prevent excessive current
  • Electronic monitoring relays
    or electrical currents. A typical application is to signal a warning when a pump motor is drawing too much current, as happens with a clogged water filter. In this case the monitoring relay senses the motor current (typically through a shunt connection) and actuates a relay if current remains above

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