Abstract
This work presents an analytical methodology to design a permanent magnet transverse flux generator using a reluctance circuit. Unlike other research, it fully indicates the details to design the rotor, stator, and the air gap of the machine, with all its geometry. In the design section, special considerations to determine the outer diameter of the rotor, and the accompanying pole pitch for the U-cores and I-cores are presented. The proposal of an iterative algorithm using a reluctance circuit to calculate the turns of the armature winding and curved trajectories of flux tubes to model the leakage flux that will allow the synchronous inductance calculation also is presented. The proposed methodology allows determining the performance and the lumped parameters of the generator. Furthermore, it provides evidence that with this design it is possible to select the values of standard voltage for electric generators of this topology. The analytical results of the magnetic flux densities, magnetic flux, lumped parameters, electromotive force, terminal voltage, armature current, power factor, and efficiency are compared with 3D finite element method. Analyzing these results, it is possible to verify the good agreement between them.
Highlights
T HE first work which analyzed the permanent magnet transverse flux generator was issued in 1986
This paper has been presented the design of a TFPMG, comparing the design methodology proposed with the 3D finite element analysis
Such methodology incorporates a simple, iterative model to determine the number of turns of the armature winding, complying with the electromotive force specified during the designing phase
Summary
T HE first work which analyzed the permanent magnet transverse flux generator was issued in 1986. P C + μrec where SP M is the surface of a PM in front of a U-core, P C is the permeance coefficient of the PM (chosen by the TFPMG designer), Br is the remanent flux density of the PM (given by the PM manufacturer), N is the number of turns of the winding armature (), I is the nominal current, μ0 is the vacuum permeability, μrec is the relative recoil permeability of each PM and hm is the height of the PM During this phase, to determine the magnetic flux, the designer of the TFPMG may consider or not, the coil current. The air gap length of the machine (lg) is determined by two designing factors, namely the height of the PM (hm) and the permeance coefficient of the PM (P C), see eq (9) [16]: lg hm PC (9)
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