Impact of stator slot geometry on the windage loss in a high‐speed linear switched reluctance motor

Abstract

A linear switched reluctance motor (LSRM) is designed for electric propulsion application in a Magnetically Levitated (Maglev) train with the base speed of 7.6 m/s and operating at a maximum of 27.8 m/s. In such high‐speed LSRMs, windage loss is one of the key issues of concern. Usually, windage loss accounts for approximately 0.5% below the base speed, 20% above the base speed, and 45% at higher speeds of the total loss of the LSRM. One of the many parameters affecting this windage loss is the stator slot profile. This research work studies about different stator slot structures, thereby aiming to reduce the windage loss through computational fluid dynamics analysis. Furthermore, experimental testing of the LSRM is also done to verify the simulation results.

Copper loss analysis and loss separation method in a dynamic process of ultra‐high speed motor with slotless stator

“…Ultra-high-speed permanent magnet synchronous motors (UHSPMSM) with high power density, high speed and low noise [1][2][3] have been extensively applied to high-precision machining spindles, micro fuel cells, aviation energy storage devices and micro-electromechanical inertial measurement devices in automatic driving systems [4][5][6][7][8]. However, operating at ultra-high frequency leads to many additional losses to motors, which can reduce the motor efficiency, increase the temperature, and affect the multi-physics characteristics of a system [9][10][11]. The copper losses of UHSPMSM include not only the DC losses but also eddy current losses.…”