ELECTRICAL MACHINE EXCITATION SYSTEM Russian patent published in 1997 - IPC

FIELD: electrical engineering; permanent-magnet electrical machines. SUBSTANCE: excitation system has permanent magnets arranged around circumference, nonretentive-material poles 1 between them, annular permanent magnet 4 on shaft end abutting inner surface of poles 1 and magnets, as well as permanent magnets 5 in the form of disks placed on ends of poles 1. Novelty is that nonretentive-material member 6 is placed inside annular permanent magnet coaxially to it and nonretentive-material disks 7 are installed at end sides of disk-shaped permanent magnets. EFFECT: reduced material input for permanent magnets without noticeable worsening of machine characteristics; reduced noise. 2 cl, 2 dwg