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QR787 w/ Shaft

  • Overview
  • Specifications
  • Info & Pricing
Overview

About QR787 w/ Shaft

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.

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
Specifications

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
Info & Pricing

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