Electric heating – Inductive heating – Metal working
Patent
1994-08-24
1996-06-25
Hoang, Tu
Electric heating
Inductive heating
Metal working
219650, 219653, 219660, 219672, B23K 1301
Patent
active
055297030
ABSTRACT:
Apparatus for inductively heating metal can lids operates at medium frequency, with a many-turn induction coil wrapped partly or entirely around the can closures. No focusing cores are required, nor need the conductors be water cooled. Can ends may be fed through the apparatus in-stick. IGBTs are used in the H-bridge of the inverter. A control system is also provided which minimizes peak current flow through the switches and obviates the need for a series inductor conventionally used for current limiting. The control system monitors the tank voltage phase angle and turns the switches on and off in optimal response thereto. Can lids are separated magnetically while being motivated by sequentially switched electromagnets, and can bodies may be rotated by a split conveyor belt while being transported through inductive heating apparatus. Closed-loop temperature control apparatus may also be included to control AC power input and to prevent overheating of the can closures in the event of unintended stoppage of the production line.
REFERENCES:
patent: 2489867 (1949-11-01), D'orio
patent: 3449539 (1969-06-01), Scheffler et al.
patent: 3523602 (1970-08-01), Mojden et al.
patent: 3694609 (1972-09-01), Kennedy
patent: 3727982 (1973-04-01), Itoh et al.
patent: 3790735 (1974-02-01), Peters
patent: 3830353 (1974-08-01), Mojden
patent: 3840138 (1974-10-01), Mohr
patent: 3966426 (1976-06-01), McCoy et al.
patent: 4017704 (1977-04-01), Collins, III et al.
patent: 4160891 (1979-07-01), Scheffler
patent: 4272313 (1981-06-01), Mori et al.
patent: 4296294 (1981-10-01), Beckert et al.
patent: 4307276 (1981-12-01), Kurata et al.
patent: 4315568 (1982-02-01), Mojden
patent: 4323150 (1982-04-01), Mojden
patent: 4333246 (1982-06-01), Sullivan et al.
patent: 4339645 (1982-07-01), Miller
patent: 4351430 (1982-09-01), Mojden
patent: 4364466 (1982-12-01), Mojden
patent: 4481397 (1984-11-01), Maurice et al.
patent: 4490922 (1985-01-01), Gorodetsky et al.
patent: 4531037 (1985-07-01), Camus
patent: 4582972 (1986-04-01), Curtin et al.
patent: 4673781 (1987-06-01), Nuns et al.
patent: 4775772 (1988-10-01), Chaboseau
patent: 4810843 (1989-05-01), Wicker et al.
patent: 4846774 (1989-07-01), Bell
patent: 4848598 (1989-07-01), Nozaki et al.
patent: 5325601 (1994-07-01), Brownewell et al.
Zinn, Stanley and Semiatin, S. L., "Coil design and fabrication: basic design and modifications", Heat Treating, (Jun. 1988), pp. 32-36.
Zinn, Stanley and Semiatin, S. L., "Coil design and fabrication: part 2, specialty coils", Heat Treating, (Aug. 1988), pp. 29-32.
Zinn, Stanley and Semiatin, S. L., "Coil design and fabrication: part 3, fabrication principles", Heat Treating, (Oct. 1988), pp. 39-41.
Zinn, Stanley and Semiatin, S. L., "Elements of Induction Heating", Electric Power Research Institute, Inc. and ASM International, (1988), pp. 1-8, 47-75, 85-141, 185-226.
Hassell, Peter A., "Medium Frequency Induction Melting--Its Control and Effective Operation", Industrial Heating (Mar. 1982), pp. 18, 20-21.
Smith, T., "Atomic energy technology applied in liquid metal processing", Metallurgia (Apr. 1990), vol. 57, No. 4, p. 174.
Schaufler, K., "Stationary and Mobile Medium-Frequency Plant for Induction Heating", Brown Bover; Review (Feb. 1978), vol. 65, pp. 88-95.
Akherraz, M. and Taj, E., "Medium Frequency Self Controlled Converter for Induction Heating Applications", Melecon '89 Proceedings, pp. 43-46 (1989).
James, P. A., "General considerations for the choice of medium frequency for induction melting", elektrowarme international 41 (1983) B3 Jun., pp. B 138-B 146.
Sears, Roebuck & Co., "Kenmore Induction Cooktop", Product Brochure (1985).
W. R. Grace & Co.; "Can end Preheat Systems", Product Brochure (undated).
Ned Mohan, Tore M. Undeland, William P. Robbins, "Power Electronics: Converters, Applications, and Design", John Wiley & Sons (1989).
Lester R. Moskowitz, "Permanent Magnet Design and Application Handbook", Robert E. Krieger Publishing Company (1976).
Shepherd Douglas F.
Sprenger Robert A.
Hoang Tu
Nordson Corporation
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