Magnetic angular encoder using an automatic offset compensation technique

Author

Kayal, M. ; Chevallaz, E. ; Burger, F. ; Popovic, R.

Author_Institution

Inst. of Microelectron. & Microsystems, Swiss Fed. Inst. of Technol., Lausanne, Switzerland

Volume

2

fYear

2002

fDate

2002

Firstpage

767

Abstract

Quality and resolution of integrated microsystems using Hall sensors dedicated to an angular encoder are strongly dependent on the accuracy of relative position of Hall sensors and on the offset of electronic frontend circuitry. In this paper, we describe a CMOS microsystem built on two integrated circuits. This contactless encoder microsystem gives three sine and square signals with a phase shift of 120° and provides an angular error less than 4 degrees without external trimming or feedback. The Hall sensor assembly with the engine consists in fixing a small permanent magnet on the rear axis of the motor. Then the sensor is positioned in front of this magnet.

Keywords

CMOS integrated circuits; Hall effect transducers; angular measurement; application specific integrated circuits; compensation; encoding; magnetic sensors; microsensors; ASIC; CMOS microsystem; Hall sensors; automatic offset compensation technique; autozero electronic circuitry; contactless encoder microsystem; electronic frontend circuitry offset; integrated circuits; integrated microsystems; magnetic angular encoder; motor rear axis; offset cancellation scheme; permanent magnet; sensors relative position; three-sensor signals; vertical Hall technology; Assembly; CMOS integrated circuits; Calibration; Engines; Feedback; Magnetic sensors; Micromotors; Permanent magnet motors; Permanent magnets; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2002. Proceedings of IEEE

Print_ISBN

0-7803-7454-1

Type

conf

DOI

10.1109/ICSENS.2002.1037203

Filename

1037203