Santest DA Series – DA03S
DA series is a unique “High Speed Servo-valve” for hydaulic and pneumatic application, employing “Dual Halbach Magnet Array” which reinforces magnetic tandem, as a result the higher response and surpassing anti-contamination characteristics can be obtained.
(Patented : Japan and USA, Patent pending : Germany)
A vioce coil of tandem differential configuration is inserted in the annular space of “Dual Halbach Magnet Array” and a spool is so fixed at the end of coil that it may move axially and freely together.
When current is supplied in intensified magnetic fields, the voice coil itself generates strong thrust force and moves together with spool in an axial direction.
Also, detecting magnets are installed at the other end of spool in such a way that Hall element may detect positional signal and sending coil may directly detect velocity signal of the spool.
Therefore, a very stable feedback system can be achived.
High speed response
Dynamic characteristics
– Step responce : 1.5msec(0 ⇔ 100%)
– Frequency responce
Gain -3dB : 630Hz (command signal : ±25%)
Phase -90° : 490Hz (command signal : ±25%)
Anti-contamination
Contamination Level : NAS1638 Class 10
Specifications
| Rated Flow (△P=7MPa) | 10 L/min 20 L/min 40 L/min 60 L/min |
|---|---|
| Max. Operating Pressure | 21MPa |
| Max. Proof Pressure at Supply Port | 31.5MPa |
| Max. Proof Pressure at Return Port | 31.5MPa(*1) |
| Drain Port | <0.05MPa |
| Internal Leakage (Ps=21MPa, hydraulic oil=IOS VG46) |
<1.7 L/min |
| Hysteresis | < 0.1% |
| Step Response (0⇔100%)(Typical)(*2) |
1.2msec 1.2msec 1.2msec 1.5msec |
| Gain -3dB (Frequency Response) (±25% Amplitude)(Typical)(*3) |
750Hz 620Hz 560Hz 630Hz |
| Phase -90° (Frequency Response) (±25% Amplitude)(Typical)(*3) |
530Hz 490Hz 480Hz 490Hz |
| Protection Level | IP65 |
| Ambient Temperature | -20°C – 50°C |
| Spool type | Zero Lap |
(*1) Using forced oil cooling, pressure at return port should be less than 7MPa.
(*2) Dry type, Supply pressure :7MPa, Supply voltage :48VDC, Port A and B direct connection.
(*3) Forced oil cooling type, Supply pressure :7MPa, Supply voltage :48VDC, Port A and B direct connection.
