Improvements in toroidal magnet fields for dynamo electric machines

摘要

658,311. Dynamo-electric machines. WINTHER, M. P. March 19, 1949, No. 7538. Convention date, May 5, 1948. [Class 35] In an imbricated pole structure for an eddy current brake dynamometer, slip coupling or other machine, the face of each polepiece contacting the surface of the coil or magnet nearest to the other member of the machine is triangular and the apex is connected to the surface facing the air-gap by a curved portion. As shown, 27 is the apex of the triangular surface 25 on which the coil or magnet rests and this is joined to the radial surface 31 forming the free end of the polepiece by a curved portion which may decrease in width towards the point 27. The heel of each polepiece may also be curved as shown. The dimensions are such that the cross-section available to the flux is uniform throughout the iron path, allowing for leaking. Specification 636,565 is referred to.