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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 Optical Encoder 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 Optical Encoder 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.
QD145 Optical Encoder 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 |
QD145 Optical Encoder 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 |
QD145 Optical Encoder 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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