INDUCTION MOTOR ROTOR Russian patent published in 1997 - IPC

FIELD: electrical engineering. SUBSTANCE: rotor has magnetic core 2 mounted on shaft 1 and provided with bars and end rings 3. Rings 3 have radial slits; contact members are placed opposite them on flexible members for radial displacement of contact with rings 3. Novelty is that flexible members are divided into at least two groups each incorporating parts of roughness degree other than that of other parts. EFFECT: provision for stepless motor starting, improved capacity, power factor, and utilization of active material under rated conditions; simplified design. 1 dwg