2012 Volume 1 Issue 3 Pages 172-177
This paper presents a design procedure for fractional-slot, three-phase tubular linear permanent magnet machines. The machine has a solid iron mover and stator core, concentrated prewound stator windings, and rare earth annular magnets with axial magnetization. The stator winding interacts with the mover magnets through the fifth harmonic of its magneto-motive force distribution. The proposed design procedure analytically determines the proper dimensions of basic geometry. A finite element method optimization of the air-gap flux density profile focusing on the shape of slots, teeth, and polar expansions completes the design procedure. The study evaluates the effectiveness of the solid iron fractional slot tubular machine for low-speed applications. Experimental verifications are included.