Design of a GMR-based magnetic encoder using TLE5012B

Magnetic encoder based on giant magnetoresistance effect, also known as GMR-based magnetic encoder, has several distinct advantages over the traditional Hall-effect magnetic encoder such as its simpler structure, higher resolution and sensitivity as well as a better tolerance toward extreme working environment. This paper gives a detail design scheme of a GMR-based magnetic encoder. Finite element analysis (FEA) simulation is carried out to find the relationship between the thickness of the air gap and the size of the magnet. Hardware design and software configuration are also discussed. Finally, an encoder prototype is made and the experiment result proves the encoder's feasibility in position detection of the motor control system.