Effect of full voltage starting on the windings of squirrel-cage induction motors

This paper discusses the effect on the windings when starting squirrel-cage induction motors with full voltage. The data is presented in four groups: namely, (1) Special tests made with a vibrograph instrument on a 60 h. p. and a 500 h. p. induction motor: (2) Observation tests made on a number of motors when starting with full voltage: (3) The condition of some windings which failed in service: (4) Formulas which show the main factors involved in the bracing of induction motors. Induction motor coil bracing in general is discussed.