Integral Controller for Use in Carrier-Type Servomechanisms

This paper presents an analysis and characteristics of a 2-phase induction motor system which may be used as an a-c integral controller in servomechanism designs or as an a-c integrator. The control phase winding of the motor is excited by a nonlinear amplifier in such a manner that the rotor acceleration is nearly proportional to the input voltage, and the output voltage, derived from the output of an a-c tachometer driven by the motor, is nearly proportional to the time integral of the input voltage. The inherent range and accuracy of the motor-tachometer combination as an integrator are substantially increased by the use of the nonlinear amplifier which line-arizes the speed-torque characteristics of the 2-phase induction motor.