|
 20mm
dia. High Resolution Optical Encoder
 |
Design Features:
- Miniature Size, 20mm (0.787") Diameter
- Resolutions up to 2048 lines per revolution direct read
- Single ended and differential outputs
- Patent pending unique sensing system
- Long service life
- Conductive carbon fiber housing
- IP 50 sealing
- High noise immunity
- Low supply current requirements
|
Quantum Devices, Inc. Model QD787 Is intended for applications
requiring high performance, high-resolution digital feedback in
a very small package. The model QD787 provides the resolution of
larger encoder packages, but in a package only 20mm (0.787") in
diameter. Outputs can be configured in either single ended, open
collector or internal pull up resistor, or with an industrial standard
RS 422A differential line driver. QDI's patent pending sensing scheme
embodies a much simplified encoder design, which ultimately results
in longer service life, and less down time due to feedback device
failure. The encoder housing is constructed of a conductive carbon
fiber composite that provides the EMI shielding of an all metal
housing and performance of a lightweight robust assembly.
Electrical Specifications
| Input Voltage |
5 VDC +/- 5% or 5-26 VDC |
| Input Current Requirements |
80 mA Max. Output Option 01 & 02, 35mA Max
Output Option 03; Plus interface Loads |
| Input Ripple |
2% Peak to Peak @ 5 VDC |
| Output Circuits |
AM26LS31 RS 422A line driver
TTL Output
OL7272 Line Driver |
| Output Format |
Quadrature with A leading B for CW Rotation. Index
centered over A |
| Frequency Response |
200 kHz |
| Symmetry |
180 Degrees +/- 10% |
| Minimum Edge Seperation |
54 Electrical degrees max |
Environmental Specifications
| Storage Temperature |
-40 to 125°C |
| Operating Temperature |
0 to 70° C Typical
-20 to 100° C Optional (Contact
factory for more information) |
| Humidity |
98% Non-Condensing |
| Vibration |
20 g's @ 50 to 500 CPS |
| Shock |
50 g's @ 11mS Duration |
Mechanical Specifications
| Maximum Shaft Diameter |
8000 RPM |
| Shaft Diameter |
0.125" |
| Shaft Material |
Stainless Steel |
| Bearings |
Radial Ball Bearing, R2 type |
| Radial Shaft Load |
2 lbs. Maximum |
| Axial Shaft Load |
1 lbs. Maximum |
| Housing |
Carbon Fiber Composite (case ground via Connector) |
| Housing Volume Resistivity |
10-2 ohm-cm |
| Termination |
Two Rows of 5 Pins on 0.100" Centers
8" Ten Conductor Ribbon Cable wi 2x5 connector |
| Mounting |
Servo |
| Moment of Inertia |
9.5x10-6 oz-in-sec2 |
| Acceleration |
1x105 Radians per Second2
|
Find the
QDI encoder distributor in your area...
To learn more about this encoder contact
us.
|
