- High Reliability
- High Rotational Speed
- Low Intertia
- Low Torque
- Compact and Light-Weight
Versatile
This
modular encoder can be constructed with any number of lay-shafts, each one
increasing the maximum count by a factor of ten. The basic encoder is
designed for instrument use and is 38mm in diameter. Heavy duty versions
with larger, sealed shafts and strong casings can also be provided. The
0.125" diameter input shaft, carried on very low torque, precision
ballraces, is fitted with a two track code wheel which provides five bit
Coles codes for two decades. The inner track generates a sequence of 20
uniquely defined codes as the shaft rotates through one turn. The outer
track contains ten similarly coded sectors giving a resolution of 1/200 of
a turn. Each lay-shaft carries a single track code wheel and is geared to
the preceding shaft with a 10:1 ratio. When the decade inputs are
energised one at a time, the outputs can share a five-line bus to reduce
the number of output wires and connections required. A code converter can
be built-in to present the output in binary, Grey-code or BCD.
For Critical Applications
Designed
for use in remotely controlled systems and electrically noisy environments
where trouble-free operation is essential, this encoder gives an absolute
readout which cannot be permanently corrupted by spikes on. or
interruptions of, the supply.
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The correct output code becomes available as
soon as the encoder is switched on, so there is no need to drive the
system to a base position for zeroing. Unlike systems controlled by
stepping motors or incremental encoders. the zero position is not lost
when the system is mechanically stalled or noise signals are picked up on
the output lines.
Motorised
Encoders
The
size 15 encoder can be built together with a servo or stepping motor. The
motor can be single or double ended. i.e. the encoder can be built onto
one end and the drive taken from the other. or the motor can drive through
the encoder making use of the encoder's gearing instead of using an
additional gearhead.
Easy
to Use
When
the decades are multiplexed only five output leads are required, however
many decades are in use. One input line is required per decade as well as
the supply and ground lines. Outputs from several encoders may use the
same output bus. As standard the inputs and outputs are HCMOS compatible
but other levels can be accommodated, if required. Connection is normally
by flying leads 450mm long. Connectors can be fitted on request.
Applications
Support
Applications
engineering support is available to assist in the implementation of
systems.
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1996 to 2002