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This paper compares the performance of inner-only and inner–outer type of magnetizing fixture designs to achieve the radial magnetization profile in an isotropic-bonded neo magnet. In inner-only fixture, the magnetization coils are located on only one side of the magnet circumference, and inner–outer fixture uses magnetization coils on either side of the magnet circumference. For both fixtures, the finite-element analysis (FEA)-based performance is presented and compared with the experimental validation. The effect of misalignment between the inner and outer coils in an inner–outer fixture is discussed using the FEA as well as experimental results, and a limit on the misalignment angle resulting in negligible reduction in mid-air-gap flux density integral per pole is arrived at. [ABSTRACT FROM AUTHOR]

In this paper, the effects of using laminated steel and solid steel for the magnetizing fixture components on the magnetization energy needed for saturation, magnetization profile, and motor performance are presented. Three combinations of fixture core and back iron materials have been analyzed using 2-D finite element analysis as well as experiments. The potential issues with the use of solid steel as fixture components have been explained. The results indicate that the magnetization fixtures made with solid steel components require higher energy to generate the magnetization field needed for magnet saturation and in most practical cases lead to partially magnetized magnet and poor motor performance. The use of laminated steel for all soft magnetic components in the magnetization fixture is highly recommended. [ABSTRACT FROM AUTHOR]