|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||91/361 ; 91/433 ; 91/459 ; 137/62565|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 27 인용 특허 : 7|
An electrohydraulic servo valve employing a linear force motor having a floating coil and armature driven by a high frequency excitation signal modulated to change its average DC component. A servo loop controller modulates the excitation signal in response to feedback signals from the servo valve or a hydraulic actuator controlled by the servo valve.
A servo valve, comprising a magnet assembly defining an air gap containing a magnetic flux; a coil support carrying an electrical winding in said air gap; disposed a spool valve composing a spool slidably disposed in a spool valve housing; operator means connected between said spool and said coil support to operate said spool valve by sliding said spool in said spool housing, said coil support, operator means and spool being free floating with respect to said magnet assembly; electrical excitation means, connected to said electrical winding, for applying...