Modular (Segmented) Electrical Machines

Dear Colleagues,

In general terms, modular construction means that distinctive portions of a system are made up of smaller subdivisions. These portions can be fabricated distinctly and later coupled together to obtain the final product. This approach is more and more commonly used in diverse high‑tech areas.
In the case of electrical machines, the modular approach denotes that their parts (the stator, the rotor, or both) are made up of distinctive segments. This approach can improve their design, manufacturing, efficiency, power density, and fault tolerance, achieving the following benefits:

• Increased flexibility in design, as more complex and efficient (even three-dimensional) magnetic flux paths can be used;
• Higher efficiencies because both iron cores and windings can be optimized, leading to diminished iron core and winding losses;
• Increased power/torque densities due to the reduced sizes of the machine;
• Less heat generated in the smaller components, making cooling easier and increasing the lifetime of the product;
• Improved material utilization because the smaller iron core pieces can be placed in an optimum way on the raw material strip during punching to reduce material losses;
• More facile integration with the drive circuits;
• Improved fault tolerance by means of easily increasing the number of the phases and their magnetic independency;
• Easier maintenance due to the piece-by-piece assembly and because the faulted coils can be more straightforwardly detected and replaced, even together with their iron core modules;
• Simpler decommissioning and recycling processes due to the rapid and easy dissociation of the modular parts.

Papers covering the design and control of electrical machines having innovative modular construction are welcome. Additionally, submissions dealing with their manufacturing technologies are highly appreciated.

Prof. Dr. Lorand Szabo
Guest Editor

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