Abstract :
Of late the attention of electrical engineers has been frequently called to types of single-phase commutator motors combining the good characteristics of a repulsion motor at starting with the characteristics of a single-phase induction motor near synchronism; the idea being to produce a motor with good starting torque and limited speed, such as would be preeminently suited for tool, elevator, and similar work. In all these cases the combination mentioned has been brought about by a mechanical change, either gradual or sudden, in the armature circuits, this change being effected either by hand or by automatically operating centrifugal devices; in short, by means not inherent to the motor.
