Signal Flow in the Current Torque Metering Systems

Monitor provides variable DC output to ESC.
ESC generates AC and drives the stator power coil.
Rotor power coil energizes the in-shaft electronics.
In-shaft electronics power strain gages.
Strain gages output voltage proportional to torque.
In-shaft electronics convert voltage to frequency.
Frequency is driven into rotor signal coil.
ESC adapts to signal coil level and converts levels for long distance transmission.
ESC converts Hall-Effect sensor signal levels (pulse per rev) for long distance transmission.
Monitor receives the torque signal, counts the pulses (measures the frequency).
Monitor receives the RPM signal, counts the pulses.
Monitor converts the frequency to a torque value using calibration data.
Monitor converts the pulses to an RPM value using calibration data.
Monitor converts units and displays values.
Monitor scales and outputs 4-20mA values.