JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x 83
5.5 Absolute Multi-turn Encoder
5.5.1 Introduction
MIS34x motors equipped with the optional absolute multi-turn encoder (H3xx option)
offer the possibility to keep track of the position regardless if power is connected or not.
When this option is present a mechanical zero search is only necessary one time after
installation and the system will keep track of the actual motor position at any time after
-
wards.
The encoder is based on a magnetic principle which do not offer the same resolution and
precision as the more expensive optical based solutions. It do however offer the advan
-
tage to keep track of the position without power applied. The magnet principle is also
much more tolerant to mechanical stress such as shock and extreme temperatures.
The absolute multi-turn option offers the following main features.
Encoder:
Resolution 409.600 counts per revolution displayed (internal 1024 cpr)
Accuracy +/- 0,1% of full scale
Repeatability +/- 0,1% of full scale
Position range -5245 to +5245 motor revolutions (+/- 2^31 motor counts)
Motor:
Resolution 409.600 counts per revolution (standard)
As seen above the motor resolution is much higher than the encoder resolution. The en-
coder option is however mostly used for stall detection at the motor (motor loose its po-
sition) and for this situation the encoder will be adequate since the motor can only stall
in multiples of a 1/50 shaft revolution corresponding to 7.2 mechanical degrees.
Only MISxxx---H3--
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