Stage of development of sensor technology

Martin Raak | 7. May 2011

The AS5304A linear encoder chip of the manufacturer Austriamicrosystems is located on the sensor boards.
The magnetic rings have 31 pole pairs (pivot) and 29 pole pairs (rotation), so that 4960 (pivot) and 4640 (rotation) signals respectively are issued per rotation. This corresponds to an angular accuracy of approx 0.07°. In addition, our magnetic rings are provided with an extended south pole for the absolute zero position (hall sensor). The two sensor boards are wired as follows:

black	GND
red	+ 5V
blue	Encoder Channel A
yellow	Encoder Channel B
green	Encoder Index
white	Hall Sensor (zero position)

The used hall sensor made by Honeywell is a solid state sensor with the type designation SS443A, the collector resistance is already placed on the boards.
Hall sensor manufacturer’s site

New version of the sensors: Two six-core cables have been swapped for one 12-core cable in the new sensors. This reduced the cable diameter from 2 x 3.1 mm to 1 x 4.0 mm. In addition, the pivot and rotary movement are better differentiated by the extended color coding of the individual wires.

An overview of the sensor cable configuration is given below.

Sensor cable configuration