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QR787 w/ Blind Bore

  • Overview
  • Specifications
  • Info & Pricing

About QR787 w/ Blind Bore

The blind hollow shaft version of Quantum Devices’ QD787 provides a high performance, high resolution digital feedback solution for small motor applications. The QD787 model 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, 5 volt RS422A differential or high voltage differential line driver. QDI’s patent pending sensing scheme embodies a much simplified encoder design, which ultimately results in longer life and less down time due to feedback device failure. The encoder housing is constructed of a carbon fiber composite that provides the EMI shielding of an all metal housing an performance of a lightweight robust assembly.

Design Features:

  • Miniature Size, 20mm (0.787″) Diameter
  • Resolutions up to 2048 lines per revolition direct read
  • Blind Hollow Shaft Bore
  • Patent pending unique sensing system
  • Long service life
  • Conductive carbon fiber housing
  • IP 50 sealing
  • High noise immunity
  • Low supply current requirements

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
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
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