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This paper presents the performance comparison among three different topologies of the permanent magnet synchronous machine, namely a transverse flux permanent magnet machine with flux concentration and claw pole structure, an axial flux machine with segmented armature torus structure and a conventional radial flux machine with embedded permanent magnets in the rotor. With the help of Finite Element Method, three electrical machines have been designed considering the required dimensions and permanent magnets mass. The complete results evaluation and comparisons are described in this paper. From the obtained results it can be concluded, the axial flux machine with segmented armature torus structure can be a competitive alternative compared with the conventional radial flux machine for applications with limited axial length, while the transverse flux machine is an attractive alternative for the high torque and low-speed applications due to its high pole number.Keywords-axial flux motor, segmented armature torus structure, soft magnetic composites, transverse flux motor with claw poles, three-dimensional finite element method

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Abstract-Highly utilized permanent magnet synchronous machines show magnetic saturation and cross-coupling effects. These phenomena are described by nonlinear differential equations and make feedback current control of the machine challenging. State of the art current control methods usually ignore these effects and hence do not produce optimal results in transient operation or in operation at the inverter voltage limit. Therefore, this paper presents a method to design a current controller taking into account saturation and dynamic crosscoupling. Feed forward calculation of transient quantities in realtime enables complete decoupling and dead-beat behavior which is experimentally validated by test bench measurements. With this approach, strongly nonlinear, highly utilized synchronous machines can be successfully controlled achieving best control quality in all operational conditions.

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