Abstract :
The theory of the constant-torque motor has been extended and presented herewith along with new circuits and experimental data showing the characteristics of a monocyclic single-phase motor. In some of the systems described the field windings of the motor serve a dual purpose of (a) supplying the field flux (b) providing the inductive reactances of a monocyclic system which delivers a constant current to the armature. While the motor thus connected cannot be defined accurately as a constant-torque drive, it provides only small variations in torque with changes in speed. For many applications (such as windings of tape, wire, thread, etc.) it would be as suitable as the constant-torque motor. Other systems described, show circuits that provide a constancy of torque. The theory presented is supported by illustrative phasor diagrams and test results.
