Abstract
An important barrier to the adoption and acceptance of synchronous reluctance (SyR) machines in different applications lies in their non-standardized design procedure. The conflicting requirements incurring at high speeds among electromagnetic torque and structural and thermal limitations can significantly influence the machine performance, leading to a real design challenge. Analytical models used for design purpose lack in accuracy and force the designer to heavily rely on finite element analysis (FEA), at least during the design refinement stage. This becomes even more computationally expensive as the speed increases, as the evaluation of the rotor structural behaviour is required. This work presents a computationally efficient hybrid analytical-FE design process able to consider all the main limiting design aspects of SyR machine incurring at high speed, namely structural and thermal. As a vessel to investigate the proposed design routine accuracy, several high speed SyR machines have been designed for a wide range of operational speeds (up to 70 krpm). The thermal and mechanical factors limiting the high speed operation are deeply analyzed aiming at maximize the mechanical output power. The proposed design approach is then validated by comparison against experimental measurements on a 5 kW-50 krpm SyR prototype.
Highlights
I N the last few decades, Synchronous Reluctance (SyR) machines have attracted increasing attention in several sectors, especially automotive and industry
The power factor depends only on the inductances, while the torque depends on both inductances and capability of the machine to produce the stator magneto-motive force (m.m.f) and flux, which in turn depends on the geometry and on the constraints imposed during the design
The maximum torque location is the compromise among the competitive needs of maximizing the magnetic anisotropy (Ld − Lq), the magnetizing current id and the q-axis current iq
Summary
I N the last few decades, Synchronous Reluctance (SyR) machines have attracted increasing attention in several sectors, especially automotive and industry. In [25], an analytical model has been extended to include the effect of the radial iron ribs on the electromagnetic performance with the aim of assessing analytically the maximum power capability of SyR machines as function of the speed All these studies, whether based on computational expensive FE automatic design approach, or based on simplified analytical models, have been carried out considering a given stator design. The power factor depends only on the inductances, while the torque depends on both inductances and capability of the machine to produce the stator magneto-motive force (m.m.f) and flux, which in turn depends on the geometry and on the constraints imposed during the design (e.g. external radius, electrical loading, current density, total losses, etc.) The hypotheses underlying this set of design equations are: Ldd = Ldm + Ls (4). This assumption will be validated in the two sections
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