Publication

Magnetic Angular Encoder Using an Offset Compensation Technique

Maher Kayal
2004
Journal Articles

Abstract

Quality and resolution of integrated microsystems using Hall sensors dedicated to an angular encoder are strongly dependent on the accuracy of the relative position of Hall sensors and on the offset of electronic front end 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 120degrees and provides an angular error of less than 4degrees without external trimming or feedback. The Hall sensor assembly with the engine consists of fixing a small permanent magnet on the rear axis of the motor. Then, the sensor is positioned in front of this magnet.

Official source

https://infoscience.epfl.ch/entities/publication/720c1e3d-517e-4729-a090-281736fb151d

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Maher Kayal
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/720c1e3d-517e-4729-a090-281736fb151d

About this result

Related concepts (32)

Magnet

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door.

Neodymium magnet

A neodymium magnet (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. Developed independently in 1984 by General Motors and Sumitomo Special Metals, neodymium magnets are the strongest type of permanent magnet available commercially. Neodymium magnet are the most widely used type of rare-earth magnet. NdFeB magnets can be classified as sintered or bonded, depending on the manufacturing process used.

Rare-earth magnet

A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements. Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets. The magnetic field typically produced by rare-earth magnets can exceed 1.2 teslas, whereas ferrite or ceramic magnets typically exhibit fields of 0.5 to 1 tesla. There are two types: neodymium magnets and samarium–cobalt magnets.

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Magnetic Angular Encoder Using an Offset Compensation Technique

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