Optical Encoders
TYPICAL APPLICATIONS
Low cost motion detection for motors used in:
• Factory automation
• Packaging and printing products
• Office equipment and computer peripherals
• Robotic tape storage and retrieval
• Semiconductor handling and
insertion machines
• Industrial automation
• Computer controlled embroidery machines
• Positioning tables
• Machine tools
FEATURES
• Two channel quadrature output with optional
index pulse
• No signal adjustment required
• Low cost
• Small size
• Resolutions up to 1024 counts per revolution
• -40°C to 100°C operating temperature
• TTL compatible
• Single 5 volt supply
BENEFITS
• Feedback information may be used in
conjuction with a position controller for
precise motor shaft position
• Encoders used in conjuction with a
4-quadrant velocity controller, such as the
BDA-Q4-70-10, allow precise velocity control
of brushless motors.
All Poly-Scientific motors can be fitted with an encoder.
Poly-Scientific uses the Hewlett-Packard HEDS and HEDM
series of optical encoders as their standard offering. Other
encoders are available; if you have a specific need please
contact one of our applications engineers.
RENCO RCML15 encoders are also a standard offering.
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135
Encoders
SPECIFICATIONS
Specifications at 25°C (77°F)
Counts Per Revolution
Number of Channels
Supply Voltage (V
cc
) (vdc)
Supply Current (I
cc
) (mA – typical)
Load Capacitance (C
L
) (pF max)
Count Frequency (f) (kHz max)
Pulse Width (P) (°e)
Phase Shift (φ) (°e)
Pulse Width Error (∆P) (°e max)
Index Pulse Width (P
o
) (°e max)
Signal Rise Time (t
r
) (ns typ.)
Signal Fall Time (t
f
) (ns typ.)
Operating Temperature (°C)
Velocity (rpm) (max.)
Acceleration (rad/sec
2
) (max)
HEDS 5500
96 to 512
Two
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
45
N/A
200
50
-40 to 100
30000
250000
HEDS 5540
96 to 512
Two + Index
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
35
125
180
40
-40 to 100
30000
250000
HEDM 5500
1000 to 1024
Two
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
45
N/A
180
40
-40 to 100
30000
250000
Definitions
•
•
•
•
Count (N)
– the number of bar and window pairs or counts per revolution (CPR) of the codewheel
Pulse Width (P)
– the number of electrical degrees that an output is high during 1 cycle. This value is nominally 180°e or 1/2 cycle
Pulse Width Error (∆ P)
– the deviation, in electrical degrees, of the pulse width from its ideal value of 180°e
∆
Phase (φ)
– the number of electrical degrees between the center of the high state of channel A and the center of channel B.
φ
This value is nominally 90°e for quadrature output.
•
Phase Error (∆f)
– the deviation of the phase from its ideal value of 90°e.
∆
•
Index Pulse Width (P
o
)
– the number of electrical degrees that an index output is high during one full shaft rotation. This value
is nominally 90°e or 1/4 cycle.
Ordering Information
In order for us to provide the correct encoder for your application, it is necessary that you provide us with:
A. # of channels
B. CPR (counts per revolution)
C. Whether or not Differential Lines Drivers are required
To facilitate the correct selection, simply fill in the blocks below.
HEDS 55
0
HEDM 55
0
# OF CHANNELS
0 = 2 Channel
4 = 3 Channel
RESOLUTION (CPR)
K = 96
C = 100
D = 192
E = 200
F = 256
G = 360
H = 400
A = 500
I = 512
# OF CHANNELS
0 = 2 Channel
RESOLUTION (CPR)
B = 1000
J = 1024
Note:
If Differential Line Drivers are needed, simply substitute an L into the part # (ex. HEDL)
EXAMPLE
You need a 2-channel encoder with a line count (CPR) of 512, the correct part # would be: HEDS-5500-I.
If you needed the 2-channel, 512 CPR, but with differential line drivers, the correct part # would be: HEDL-5500-I.
136
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Encoders
Package Dimensions
HEDS-5500/5540, HEDM-5500
Note:
For the HEDS-5500 and HEDM-5500, Pin #2 is a No Connect. For the HEDS-5540, Pin #2 is CH. I, the index output.
HEDS-5600/5640, HEDM-5600
Note:
For the HEDS-5600 and HEDM-5600, Pin #2 is a No Connect. For the HEDS-5640, Pin #2 is CH. I, the index output.
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Encoders
Output Waveforms
HEDL Parameters
Waveforms
Block Diagram
Pinouts
138
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