Discussion on “Polyphase commutator machines and their application”

Abstract

Torque is proportional to the armature current I, to the field flux, and to the cosine of the angle of displacement between them, which is 9.Substituting the values of cos 9 and $ in the expression for torque, Torque = constant X I 2 sin a.This indicates the intimate relation between torque, current, and brush position.The current is a maximum when the induced voltage, S V, is a maximum, namely, when S V becomes a diameter of the circle and equals E/cos 9 volts.The induced voltage is also