The invention discloses a balanced high-pressure large-current AC (
Alternating Current)
servo direct-driven
cartridge valve, comprising an AC
servo motor, wherein the AC
servo motor and a
harmonic reducer are connected to a valve sleeve, the output shaft of the AC servo motor is connected with the input shaft of the
harmonic reducer, the output shaft of the
harmonic reducer is connected with a leading screw by a coupler, the leading screw is provided with a sliding block, the sliding block is connected with a
linear displacement sensor, the sliding block is connected with a valve rod, the end of the valve rod is provided with an external thread, a valve core is provided with an internal thread, the valve rod drives the opening and closing of the valve core by internal thread connection, a small end cover is connectedly fixed on a
valve seat, and is fixedly connected with a valve core sleeve, a valve sleeve is inserted in the
valve seat and fixed in the
valve seat by a top end cover, the top end cover is fixed with the valve seat, and the valve seat is installed in a hydraulic
system by a plug-in manner, so that the influence of the oil-
liquid pressure on the valve is reduced, and the instant hydraulic power of the valve is small. According to the invention, as a closed-
loop control servo direct-driven manner is adopted, the valve has the advantages of simple structure,
rapid response, accurate control and high
linearity.