Comprehensive Study on Various Types of Magnets Used in Permanent Magnet Electrical Motors

This paper presents a comprehensive study on different types of magnets used in permanent magnet electrical motors. The different types of magnets are classified on the basis of various factors such as material composition, design, testing methods, and applications. A classification of the permanent magnet motors on the basis of the shape of their rotors has also been included in this paper. The comprehensive study on various commonly used magnetic materials have been presented in this paper such that Alnico, ferrite, samarium-cobalt (SmCo) and neodymium-iron-boron (NdFeB) etc.