Hybrid injection molding machine

Details Hybrid injection molding machine Hybrid injection molding machine

1998-02-27

2000-07-18

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Molding pressure control means responsive to pressure at...

264 407, 425150, 425170, 425171, 425589, 425592, B29C 4577

Patent

active

060898496

ABSTRACT:
An energy efficient general purpose injection molding employs a hydraulic drive for injection and clamp machine functions and an electric drive for screw recovery. Both drives use AC "squirrel cage" induction motors under vector control. Speed command signals for the vector controls are generated by the machine's controller utilizing state transition and predictive signal techniques to account for motor and motor/pump response latencies. Hydraulic drive efficiency is improved by varying motor speed/pump output to match cycle requirements to retain hydraulic drive advantages for mold clamp and injection functions while improving the electric drive performance for screw recovery.

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Plastics World, Feb. 1986 Issue, entitled "IMM power use cut by 70%", p. 15.
"Baldor Sweodrive" paper entitled "Understanding Vector Control" (4 pages).
Paper entitled "AC Vector Drive Using Current Regulated PWM" by Frank N. Klein, Eaton Corporation (6 pages).
Article reprinted from PCIM Magazine, Jun. 1989 issue entitled "Vector Control Gives AC Drive The Edge Over DC" by Peter J. Walter and Frank N. Klein/Eaton Corporation (4 pages).
Battenfeld Brochure, Jun. 1990, entitled "Screw Drive with three-phase Servo Motor";.
Battenfeld Brochure, dated Sep. 1991, entitled "Injection Moulding Technology of the '90s".

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