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 1.45"
Diameter Optical Encoder
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Design Features:
- 500 kHz Fundamental Frequency Response
- Low Profile, 0.87" assembled Height
- Bearing Design Simplifies Encoder Attachment
- Resolution up to 5000 Lines Per Revolution Direct Read
- 4, 6 or 8 Pole Commutation
- Conductive Carbon Fiber Housing
- Standard 1.812" Bolt Circle Mounting
- Through Shaft Sizes up to 0.375" Diameter
- High Noise Immunity
- Cost Competitive with Modular Encoders
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Quantum Devices, Inc. Model QD145 provides an improved
feedback solution in applications typically using modular encoders.
With an over all height of just only 0.87” and the stability
of a bearing encoder design, the model QD145 can provide significant
performance upgrades in applications limited by traditional modular
encoder solutions. Outputs consist of a quadrature with reference
pulse and three-phase commutation, which can be configured with
either the industrial standard 5 volt RS422A Line Driver or the
5 to 26 volt OL7272 line driver. A flexible member allows for much
greater tail shaft run out than can be tolerated by modular encoder
designs, plus it provides 30 degrees of rotation for commutation
timing. A housing constructed of conductive carbon fiber composite
provides the EMI shielding of an all metal housing and the performance
of a lightweight robust assembly.
Electrical Specifications
| Input Voltage |
5 VDC +/- 5% or 5-26 VDC |
| Input Current Requirements |
125mA Max. Plus interface loads |
| Input Ripple |
2% Peak to Peak @ 5 VDC |
| Output Circuits |
AM26LS31 RS 422A Line Driver
OL7272 High Voltage Line Driver
TTL Output |
| Incremental Output Format |
Quadrature with A leading B for CW rotation with
Index Pulse centered over A for 2500 line count and below.
Index Pulse true over A and B High for 2500 line count and
above |
| Frequency Response |
500 kHz |
| Symmetry |
180 Degrees +/- 10% typical |
| Minimum Edge Separation |
54 Electrical degrees max |
| Commutation Format |
Three Phase 4, 6 or 8 Poles |
| Commutation Accuracy |
+/- 1o Mechanical |
Environmental Specifications
| Storage Temperature |
-40 to 125oC |
| Operating Temperature |
-20 to 100oC Typical
-20 to 120oC Optional |
| Humidity |
98% Non-Condensing |
| Vibration |
20 g's @ 50 to 500 CPS |
| Shock |
50 g's @ 11 mS Duration |
Mechanical Specifications
| Maximum Shaft Speed |
8000 RPM |
| Through Shaft Diameter |
0.250", 0.3125", 0.375", 5mm,
6mm, 8mm, 10mm
(-0.0000, + 0.0005) |
| Radial Shaft Movement |
0.007" TIR |
| Axial Shaft Movement |
+/- 0.030" |
| Housing |
Carbon Fiber Composite (case ground via cable) |
| Housing Volume Resistivity |
10-2 ohm-cm |
| Termination |
15 Conductor Cable, 28 AWG 18" long, 9 conductor
cable for non-commutated and TTL outputs |
| Mounting |
1.812" Bolt Circle |
| Moment of Inertia |
1.5x10-4 oz-in-S2 |
| Acceleration |
1x105 Radians per Second2 |
| Accuracy |
+/- 1.0 arc minute |
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