Method of induction annealing squirrel cage rotors

Details Method of induction annealing squirrel cage rotors Method of induction annealing squirrel cage rotors

1979-04-20

1981-07-28

Kozma, Thomas J.

Electric heating

Metal heating

Of cylinders

219 1057, 219 1079, 148108, 148121, 310211, 29598, H05B 606, H02K 1502

Patent

active

042812348

ABSTRACT:
Method of induction heating (annealing) the aluminum rotor cage of a squirrel cage rotor assembly so as to enhance the conductivity of the rotor cage with a consequent enhancement of the operating characteristics and efficiency of motors incorporating the annealed rotor. The rotor assembly is placed within a gap in the core of an induction heater transformer and is subjected to an alternating magnetic field which passes in generally radial direction through the body of the rotor assembly so as to induce a current in the rotor cage which resistance heats the rotor cage substantially independently of the steel laminations comprising the core of the rotor body. The rotor assembly being heat treated is rotated about its longitudinal axis so as to provide substantially uniform heating of the rotor cage.

REFERENCES:
patent: 2368809 (1945-02-01), Denneen et al.
patent: 3093888 (1963-06-01), Huguley
patent: 3187155 (1965-06-01), Beckert et al.
patent: 3612925 (1971-10-01), Swanke
patent: 3965321 (1976-06-01), Brinkmann et al.
patent: 4082936 (1978-04-01), Aoki et al.

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