Injection molding machine control having motor slip compensator

Details Injection molding machine control having motor slip compensator Injection molding machine control having motor slip compensator

1993-06-09

1995-08-22

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60449, 425145, F04B 126, B29C 4792

Patent

active

054435870

ABSTRACT:
An apparatus for controlling an injection molding machine includes a slipping detection device to detect the slippage of a pump motor which drives a hydraulic pump; a rotational velocity sensor which detects the rotational velocity of the pump motor, for example; and an instruction signal correcting circuit having an addition circuit which adds the operation circuit which obtains from the detected signal of the rotational sensor a flow rate instruction correcting signal to compensate the reduction of the discharge flow rate due to the increased slippage, and the flow rate instruction correcting signal to the flow rate signal, and then, detects the slippage of the pump motor and corrects the magnitude of the flow rate instruction signal thereby to compensate the discharge flow rate.

REFERENCES:
patent: 3785754 (1974-01-01), Miller
patent: 4103489 (1978-08-01), Fletcher et al.
patent: 5088297 (1992-02-01), Maruyama et al.

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