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I. MOTIVATION FOR RESEARCH Recently, the use of high-speed permanent magnet synchronous motors (PMSMs) has become prominent owing to their high efficiency, simple structure, high power density, and small size [1–2].
Motivation for research Recently, integrated motor propulsors (IMPs) have been under extensive research and development because of the numerous advantages of underwater propulsion for vehicles, such as a simple, quiet, lightweight, and small-size structure [1].
Recent studies have indicated that there is a high demand for high-efficiency machines used for home applications, such as washing machines and air conditioners. Such applications require components with high efficiency and high power density such as permanent magnet (PM) machines. In particular, variable-flux PM (VFPM) machines using a low-coercive force magnetic material have been studied extensively...
Recently, integrated motor propulsors (IMPs) have been under extensive research and development because of the numerous advantages of underwater propulsion for vehicles, such as a simple, quiet, lightweight, and small-size structure [1]. IMPs require minimized torque ripple for smooth and quiet operation when used in undersea vehicles or unmanned submarines. Thus, torque ripple reduction should be...
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