• 유공압시스템학회:학술대회논문집
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• 유공압시스템학회 2010년도 춘계학술대회
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• pp.1-6
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• 2010

Direct Drive Valves (DDV) with electric closed loop spool position control are suitable for electrohydraulic position, velocity, pressure or force control systems including those with high dynamic response requirements. The spool drive device is a permanent magnet linear force motor which can actively stroke the spool from its spring centered position in both directions. This basic study is carried out to drive the design parameters for developing a domestic DDV. The static and dynamic characteristics of DDV are examined. The simulation results are compared with data of manufacture's catalog to show the validity of the modelling.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.3-6
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• 1998

In this paper, we evaluated the effect the tooth shape influenced against the thrust force which then was confirmed by experimentation. We analyzed the effect of by measuring static thrust force of the Phases of A and B. With this result, we found that there is an area where the thrust force abruptly decreases because the variance of the airgap permeance is very small following the positions of the stator and the mover. And the unbalance among phases showed almost equal, which means that static thrust force of the phases of A and B is very small because magnetic path of the 2-phase 8-pole HB-type is almost equal.