Revista Brasileira de Ensino de Física
Print version ISSN 1806-1117
STEWART, Seán M.. Some simple demonstration experiments involving homopolar motors. Rev. Bras. Ensino Fís. [online]. 2007, vol.29, n.2, pp. 275-281. ISSN 1806-1117. http://dx.doi.org/10.1590/S0102-47442007000200012.
The ready availability of very strong permanent magnets in the form of rare-earth magnetic alloys such as neodymium-iron-boron has lead to renewed interest in one of the oldest types of electric motors - the homopolar motor. The ease with which a demonstration homopolar motor can now be built and operated when neodymium magnets are used is quite remarkable. In this paper some simple homopolar motors employing neodymium magnets suitable for demonstrational purposes are described and discussed.
Keywords : homopolar motor; homopolar roller; neodymium magnets; driven wheel; Lambert W function.