Electric heating – Metal heating – Of cylinders
Patent
1990-01-23
1991-03-12
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1075, 219 1067, 219 1079, H05B 612
Patent
active
049994670
ABSTRACT:
Disclosed is a low-frequency electromagnetic induction heater which comprises at least six induction coils each having a circular configuration and positioned in a circular and symmetrical configuration. The coils form three sets of coils such that each set of coils receives electrical power in a different phase from a three- phase electrical power source, such as a three-phase alternating current power source. The coils are interconnected such that the current flows from a first coil to a second other coil substantially opposed to the first coil. In a preferred embodiment, the heater consists of six coils connected in a three-phase double delta connection. This invention provides for heating of the heating element with continuous attraction to the induction coils, a substantial increase of electromagnetic flux density, prevention of noise due to electromagnetic vibration of the heating element, and high thermal efficiency.
REFERENCES:
patent: 3906181 (1975-09-01), Hibino et al.
patent: 3980858 (1976-09-01), Hibino
patent: 4029926 (1977-06-01), Austin
patent: 4348571 (1982-09-01), Dills
patent: 4647744 (1987-03-01), Kitano et al.
patent: 4675487 (1987-06-01), Verkasalo
patent: 4792652 (1988-12-01), Seguy et al.
patent: 4874916 (1989-10-01), Burke
Leung Philip H.
Nikko Corporation Ltd.
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