DDV manual
Time: 2017-11-30
MOOG MOOG DDV servo valve MOOG (Moog) D633, D634 series servo valve is MOOG's latest development of the new electro-hydraulic servo valve, has been MOOG GmbH (Germany) company mass production.
It is a direct drive servo valve, referred to DDV (Abbreviation of Direct Drive Servo Valve), the port and mounting dimensions D633 by NG6 (Cetop 3), D634 by NG10 (Cetop 5), with integrated circuit valve position Closed-loop control, spool drive is a permanent magnet linear motor.
The centering spring keeps the spool in the neutral position. The linear force motor overcomes the centering force of the spring so that the spool can be offset from the center in both directions and balanced in a new position, thus solving the problem that the proportional solenoid can only work in A lack of strength in one direction.
Valve Position Closed-Loop Control Electronic and Pulse Width Modulation (PWM) Drive Circuits cure as a single manifold with a special connection technology that secures the servo valve so the D633 and D634 Series servo valves can be operated without electronics control.
D633 and D634 series servo valves are the development and supplement of two-nozzle force feedback two-stage servo valve of MOOG company which is enduring and famous, and the traditional MOOG30,31,32,34,35 and E760 series servo valve phase Than the biggest difference is that D633, D634 series servo valve from the structure of a nozzle front bezel canceled, with high-power linear motor replaced the low-power torque motor, with advanced integrated block and micro-position sensor Replacing the complex mechanical feedback device - force feedback lever and spring tube simplifies the structure, improves the reliability and greatly reduces the manufacturing cost, while maintaining the basic performance of the two-stage servo valve with the pilot-stage With technical indicators.
MOOG DDV servo valve features 1.
In the position, speed, pressure and force electro-hydraulic servo system can be two two, three three or three four way work.
2.
Installation form and size in line with DIN24340 and cetop3 and 6.
3.
No hydraulic pre-class.
4.
Power failure, damage to the cable, or emergency stop servo valve can be self-back, without external force to promote.
5.
Dynamic performance and supply pressure has nothing to do.
6.
Waterproof IP65 (DIN40050) level.
7.
Low hysteresis, high resolution.
8.
Reverse polarity protection with over-voltage protection.
9.
Electronic zero adjustment to compensate for load drift.
10. Standard spool position monitoring.
How DDV Servo Valves Work An electrical command signal is applied to the spool position controller manifold. The electronics produces a pulse-width modulated (PWM) current in the linear motor. The oscillator energizes the spool position sensor (LVDT).
After the demodulation of the spool position signal and the command position signal to compare.
The spool position controller generates a current-to-force motor that drives the spool and always moves the spool to the commanded position.
The position of the spool is proportional to the command signal.
The actual flow rate of the servo valve, Q, is a function of the spool position and the pressure drop across the metering side of the spool.
Permanent magnet linear motor works Linear motor is a permanent magnet of the differential motor.
Permanent magnet to provide part of the required magnetic force.
The current required for the linear motor is significantly lower than the current required for the same-grade proportional solenoid.
The linear motor has a neutral neutral position because it generates force and travel as soon as it deviates from the neutral position, and the force and travel are proportional to the current.
Linear motors must overcome the centering forces and external forces (ie, hydrodynamic forces and contamination caused by friction) generated by high-stiffness springs during their outward extension.
When the linear motor returns to neutral position, the centering spring force is in the same direction as the force generated by the motor, which is equivalent to providing additional driving force to the valve core, thus greatly reducing the sensitivity of the DDV servo valve to contamination.
Linear motor with spring back, without an additional current.
Valve Flow and Pressure Drop The nominal flow QN for each metering side at the nominal pressure drop per metering side of 100% of the command signal (ie + 10VDC = 100% valve opening) for each metering side is the flow of the valve.
At constant command signals, the flow rate of the valve for other pressure drops is changed as a function of time.
At this time, the calculated flow rate Q of the valve corresponds to an average flow rate of no more than 30 m / s for each window of P, A, B or T.
Flow function for sharp-edge orifice (metering edge): Q = QN
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