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1. (WO2017153001) VALVE ACTUATING DRIVE

Pub. No.:    WO/2017/153001    International Application No.:    PCT/EP2016/055364
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Mar 12 00:59:59 CET 2016
IPC: H02P 8/24
F16K 31/04
F16K 31/06
H02J 7/34
Applicants: KARL DUNGS GMBH & CO. KG
Inventors: OBERMÖLLER, Nils
MARX, Dominic
BÖS, Benjamin
Title: VALVE ACTUATING DRIVE
Abstract:
The invention relates to a valve drive (10) having damping circuitry comprising a capacitive damping circuit (37), which is activated in the event of generator operation of the stepper motor (18). The damping circuitry, together with the motor winding (26), forms a resonance assembly LCR, which has the effect of stabilizing and controlling rotational speed. The rotational speed of the stepper motor (18), running in generator operation, is constantly held within limits, without the control intervention of control circuitry. Therefore, the damping circuity can operate even in the currentless state of the control system and is reliable regardless of external current supply. Fast closing is achieved, and excessively long post-running of the motor (18) is reliably prevented.