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Scalability of Synchronous Reluctance Machines Considering Thermal Performance

Synchronous reluctance (REL) machines attract increasing attention in recent years, mainly due to the merits of cost-saving, high-efficiency, low-maintenance and high-reliability. For industrial mass production, the development of machines with a series of power ratings is of great demand. To this purpose, a detailed design of one machine is usually accomplished first, then a design of similar machines but different ratings are achieved by geometry scaling. This paper aims to investigate the scalability of the REL machines, taking into account the electromagnetic behavior and thermal performance. Analytical equations are presented to describe the scaling law, and the scaling factors for various parameters are studied. The scalability analysis is carried out in terms of linear and saturated situations, and additionally, the constant-temperature-rise conditions. At last, these analyses are verified by finite element simulations with various REL machine models.