Abstract :
After a brief reference to phase advancers, the Heyland motor and its modifications and the Osnos motor (to which the paper is chiefly devoted) are described. The theory of the Osnos motor, which is also known by its trade names of ¿No-Lag¿ and ¿Kosfi-Leading¿, is then developed, and the equivalent circuits, test results, circle diagrams, and verification of the theory of the machine are given. A general method of obtaining the copper loss, output, torque, etc., from the circle diagram of any motor is developed; an example is worked out and the results so obtained are compared with test figures. A description follows of the Fynn-Weischel and Torda motors (known also by their respective trade names of ¿Tru-Watt¿ and ¿All-Watt¿), and the principle of action and characteristic curves of these machines are given.
