GB190602151A - Improvements in Rotating Magnets for Dynamo Electric Machines. - Google Patents

Abstract

2151. Parsons, C. A., Stoney, G. G., and Law, A. H. Jan. 27. Armatures; field magnets.-The windings upon field magnets or rotors that rotate at a high speed, and Especially alternators driven by steam turbines, are separated into two or more coils held in position by bolts parsing into the core of the magnet. The end conductors forming the winding are reduced in thickness and bent by means of a die so as to clear the shaft, the local heating produced when a portion of a core is reduced in area being conducted away by dividing up the winding at the ends of the rotor into more numerouscoils. The strip windings upon the polesa with shoes g are divided into coils b, c, d, e, which are secured in a direction at right-angles to the pole by means of bolts f, which may be of oval &c. section to economize space, passing between adjacent coils such as b, c or through holes in the coils into the pole core a or through the body of the rotor, the other ends clamping the coils in position by means of the plates h. The conductors may be narrowed away locally, Fig. 2, so as to reduce the section of the coil, allowing it to pass the shaft i at the ends of the rotor, or the conductor may be narrowed in one direction so as to clear the shaft and widened in the other direction, the sectional area being unaltered. When the section of the coil is reduced, the end conductors are divided into a greater number of coils to allow a greater surface for the dissipation of heat. The coils are bent into the arc of a circle by pressing the copper strip into a die by hydraulic pressure or other means. The shaft may be of oval or oblong section so as to be clear of the end conductors. The narrowing of the coils is applicable also to magnets, transformers, compensating-windings, and the like.