Synchronous reluctance motors (SyRM) produce torque thanks to the rotor magnetic anisotropy, without use of permanent magnets (PMs) or windings on their rotor. Consequently, SyRMs are cost-competitive against costly PM synchronous machines and more efficient than asynchronous motors, because of the absence of the squirrel cage and related Joule loss in the rotor. The SyR motor's rotor laminations have air cavities called flux barriers carved in each pole to maximize anisotropy and torque. The rotor iron parts, called flux carriers, are kept together by tiny pieces of steel called the structural ribs, which withstand significant centrifugal stress at high operating speed. If the ribs size is increased, more flux bypasses the flux barriers are bypassed and the reluctance torque diminishes. Altogether, magnetic anisotropy and structural integrity need a proper co-design strategy to be formulated. Since magnetic design relies on non-negotiable 2D finite element model (FEM) analysis, using 2DFEM also for centrifugal stress evaluation would lead the computational burden to unacceptable levels. The paper develops a comprehensive co-design methodology based 2D magnetic FEM and beam structural analysis (1D-FEM), that limits the size of the structural problem and make extra time dedicated to structural computation negligible.
Magnetic and structural co-design of synchronous reluctance electric machines in an open-source framework / Ferrari, Simone; Pellegrino, GIAN - MARIO LUIGI; Bonisoli, Elvio. - In: INTERNATIONAL JOURNAL OF MECHANICS AND CONTROL. - ISSN 1590-8844. - STAMPA. - 17:1(2016), pp. 59-66.
Magnetic and structural co-design of synchronous reluctance electric machines in an open-source framework
FERRARI, SIMONE;PELLEGRINO, GIAN - MARIO LUIGI;BONISOLI, Elvio
2016
Abstract
Synchronous reluctance motors (SyRM) produce torque thanks to the rotor magnetic anisotropy, without use of permanent magnets (PMs) or windings on their rotor. Consequently, SyRMs are cost-competitive against costly PM synchronous machines and more efficient than asynchronous motors, because of the absence of the squirrel cage and related Joule loss in the rotor. The SyR motor's rotor laminations have air cavities called flux barriers carved in each pole to maximize anisotropy and torque. The rotor iron parts, called flux carriers, are kept together by tiny pieces of steel called the structural ribs, which withstand significant centrifugal stress at high operating speed. If the ribs size is increased, more flux bypasses the flux barriers are bypassed and the reluctance torque diminishes. Altogether, magnetic anisotropy and structural integrity need a proper co-design strategy to be formulated. Since magnetic design relies on non-negotiable 2D finite element model (FEM) analysis, using 2DFEM also for centrifugal stress evaluation would lead the computational burden to unacceptable levels. The paper develops a comprehensive co-design methodology based 2D magnetic FEM and beam structural analysis (1D-FEM), that limits the size of the structural problem and make extra time dedicated to structural computation negligible.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2643682
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