Abstract
Since line-start synchronous permanent magnet motors (LSPMs) entered the market, they have attracted research interest toward counterpart induction motors of low power-ratings. This paper reports an investigation of line-start synchronous reluctance motors (LS-SynRMs). LS-SynRMs has not been investigated as much as LSPMs have. A motor needs to maximize rotor saliency to achieve high efficiency and a high power-factor. This results in complicated rotor geometry because the rotor cage and multiple flux barriers share the same rotor space. This paper provides an approximate method based on steady state torque analysis by which to estimate the critical inertia of a LS-SynRM. A finite element analysis (FEA)-aided analytical approach to the approximation of steady state torque is proposed to replace the more typical approach based on equivalent circuit parameters. The critical inertia resulting from the proposed method is compared to the results obtained using the FEA.
Highlights
Induction motors have by far the vast majority of the market share of electric motors
Efficiency regulations of electric motors are being strictly applied around the world to reduce energy consumption broadly, and these regulations will be further tightened. This means that induction motors (IMs) in the small-mid power range might lose their majority in the future market
LS-SynRMs may not achieve efficiency as high as that of an line-start synchronous permanent magnet motors (LSPMs) of an equivalent volume, it is still attractive due to the near absence of rotor copper loss, which typically accounts for 25% of the total loss in IMs [1]
Summary
Induction motors have by far the vast majority of the market share of electric motors. A prototype LS-SynRM with a die-cast aluminum rotor cage was manufactured It achieved around 90% efficiency in direct measurement, whereas the reference IM recorded directly measured efficiency of around 88.5%. To the best knowledge of the author, aside from the work above, the synchronization process of LS-SynRMs (characterized by multiple flux barriers) has been simulated in the design state using circuit-field-torque coupled FEA [9,10,11,12,19,20] without an alternative approach The reason for this may be that accurate estimation of the rotor parameters of a LS-SynRM is challenging due to the complicated rotor geometries. The result obtained using the proposed method is compared with that obtained using FEA
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