Injection molding machines having a brushless DC drive system

Details Injection molding machines having a brushless DC drive system Injection molding machines having a brushless DC drive system

1989-06-23

1991-01-29

Heitbrink, Timothy

Plastic article or earthenware shaping or treating: apparatus

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

Feed control of material en route to shaping area

264 403, 264 405, 264 407, 318138, 318254, 425149, 425150, 425589, B29C 4577

Patent

active

049882732

ABSTRACT:
An injection molding machine utilizing brushless DC motors in its servomechanism drive systems. Brushless DC motors provide a cost effective high power drive system which has the simplicity of control of brush-type DC motors. By utilizing higher resolution encoders and controlling pressure with the servomotor velocity control loop, motor cogging and zero velocity oscillatiions are minimized.

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