Need help in understanding AS5510 linear position encoder working

[vishu489]

Hello friend

Can anyone explain the working of linear position encoder AS5510? I mean how does it measure linear displacement of magnet? Also is it possible to use magnetic tape with this encoder to measure large displacement value?

Actually i have gone through the datasheet of encoder and understand electric and interface characteristic but not able to understand how does it measure the linear displacement since it involves lots of physics, I think so.:-(

Any small help would be great.

 

[HTA]

Hello vishu489,

the AS5510 uses a simple single linear Hall-element and calculate the position by measuring the flux generated by a north/south pole magnet/tape of approx. 0.4 to 2mm pitch. More advanced solution are using a Hall brigdes. To scan rotating magnetic field hall encoder are using four Hall-bridge sensor arranged in a square to generate the sine and cosine wave to measure the absolute position within one cycle or rotation. For linear measurements the four Hall-bridge sensors are place in one row at the distance of the wanted north/south pole pitch(e.g. 4mm). This generate one sine/cosine cycle over the 4mm to measure the absolute position within the pole pitch. If the magnetic scale tape is for example 40mm this will generated 10 cycles. For the absolute position you need to count the number of cycles. You find some drawing here: https://www.edn.com/design/sensors/4324812/Speed-acquisition-made-simple. If you want to measure absolute over a longer distance you could use a nonius principle with two magnetic rows. The iC-MU for instance has this principle implemented and measure absolute over 40.96mm(PP 1.28mm) More details on the nonius principle you find here: https://www.sensorsmag.com/sensors/position-presence-proximity/the-vernier-scale-goes-digital-1541 .

Enjoy your design work!