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

pivoting motion  
red + 5V
black GND
white Hall sensor
green Encoder Index
blue Encoder Channel A
yellow Encoder Channel B
white/brown + 5V
Brown GND
Gray Hall sensor
white/green Encoder Index
violet Encoder Channel A
pink Encoder Channel B

[forcecaption]Readout unit with display of the rotating and pivoting motion.<br><br>

[forcecaption]Sensorchips for<br> 1) Rotating and<br>2) pivoting motion

[forcecaption]Magnetic rings for <br>1) Rotating and<br>2) pivoting motion

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