Method of Obtaining the Transfer Function of a Two-Phase Servo Motor

The paper considers the voltage-current relations of a 2-phase machine to be defined by the generalized impedance matrix. A modulation transfer function is derived which allows closed loop system performance to be predicted. An ac model suitable for use in ac servo simulations is presented, and a modified design criterion is propounded for obtaining best transient performance. A comparison of the appropriate transfer functions is made using the stalled torque as a criterion when