Publication

Exploitation of iron B-H local hysteresis for the rotor position detection of a PM motor

Yves Perriard
2009
Conference Papers

Abstract

In this paper it is shown that the phase self inductance and resistance, both measured at a high frequency, of a permanent magnet (PM) motor with non-salient rotor vary slightly with the rotor position. The origin of these variations is deeply investigated, taking into account typical physical phenomena present in PM motor. Surprisingly, no classical approach can explain these variations. The physical explication is found in the non-linearity of the iron magnetization B-H curve, and more accurately in the local B-H hysteresis loops. In order to exploit these small variations for the rotor position detection, a simple measurement technique is presented.

Official source

https://infoscience.epfl.ch/entities/publication/8974dfd1-4b19-48fc-8192-48b4fbf3cf1d

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Yves Perriard
2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8974dfd1-4b19-48fc-8192-48b4fbf3cf1d

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.

Ferrite (magnet)

A ferrite is a ceramic material made by mixing and firing iron(III) oxide (, rust) with one or more additional metallic elements, such as strontium, barium, manganese, nickel, and zinc. They are ferrimagnetic, meaning they are attracted by magnetic fields and can be magnetized to become permanent magnets. Unlike other ferromagnetic materials, most ferrites are not electrically conductive, making them useful in applications like magnetic cores for transformers to suppress eddy currents.

Magnetic hysteresis

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely. To demagnetize it requires heat or a magnetic field in the opposite direction. This is the effect that provides the element of memory in a hard disk drive.

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Exploitation of iron B-H local hysteresis for the rotor position detection of a PM motor

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