GB497205A - Alternating current motor with low-voltage lamp taps - Google Patents

Abstract

497,205. A. C. motors. FAIRWEATHER, H. G. C. (Singer Manufacturing Co.) June 7, 1938, No. 16885. [Class 35] Supplying reduced lighting voltage from motor windings.-Current for lighting at reduced voltage is obtained from a pair of diametrically opposite electrically balanced coils of the uniformly distributed stator winding of an alternating-current motor operating at constant or approximately constant speed. In the form shown, the winding of one phase of a four-pole induction motor stator is shown, the individual coils of all the polar groups. g<1>-g<4> having the same span. The coils of groups g<2> and g<4> have half the cross-section of the coils of groups g<1> and g<3> but double the numbers of turns. The groups g<1>, g<3> are series connected but groups g<2>, g<4> are parallel connected and the lamp 12 is connected to coils c<2>, c<4> of groups g<2>, g', the coils c<2>, c<4> being diametrically opposite on the stator core. In a modification the coils of the group containing the lamp tappings have the same number of turns and the same size wire as the remainder of the coils of the winding.