Calculation of Single-Phase Series Motor Control Characteristics

This paper describes a simple method of plotting acceleration curves by resolving the reactance and resistance of the transformer, reactive coil, and wiring into a single effective reactance and effective resistance for each open-circuit transformer secondary voltage. By the use of these factors and the motor characteristics simple calculations can be made to determine with any given motor voltage and load the required open-circuit voltage of the transformer. Any errors introduced by the use of the approximate values of effective reactance and resistance are of very minor value and do not appreciably affect the final results.