Comparative Study of Ipm Synchronous Machines With Different Saliency Ratios Considering Evs Operating Conditions

Abstract

Abstract-In this paper, based on different saliency ratios ρ, three interior permanent magnet (IPM) synchronous machines respectively owning a large ρ, a low ρ and an inverse ρ are proposed for the potential applications of electrical vehicles (EVs). To grasp the impacts of saliency ratio on machine performances, comparative studies are conducted at low speed operation (constant torque region) and high speed operation (constant power region), respectively. In particular, the overload capability referring to magnet demagnetization is emphasized in low-speed heavy-duty operation region. And in high speed, the constant power speed range (CPSR) and high efficiency range are investigated. The main results put in evidence the different behaviors of the three machines in terms of EVs operating conditions. Though all three machines reveal considerable behaviors in CPSR, the inverse saliency ratio machine shows a larger high efficiency region and extends the high efficiency region to a wider speed-and-torque range due to its unique characteristic of L q < L d .

Torque Comparison of Surface Mount and Interior Permanent Magnet Synchronous Motor for Railway Applications

“…Lumped parameter magnetic circuit model (LPMSM) [22], winding function theory (WFT) with LPMSM [23]and finite element method (FEM) [24] are proposed to find Ld and Lq values for IPMSM. Also, [25] compares large, low, and inverse saliency effects on the IPMSM. According to [26], saliency ratio is around between 2 and 3 for traditional IPMSM.…”

A comparison between conventional and flux‐intensifying interior permanent magnet synchronous machines

“…However, cogging torque and speed sensorless control based self‐sensing approach need investigation. In Reference 7, the inverse saliency ratio machine ( L q < L d ) shows a larger high efficiency region and extends the high efficiency region to a wider speed and torque range due to its unique characteristic. In Reference 8, two different shapes of flux barriers (surface and interior flux barriers) are inserted.…”