Abstract
The arrangement of permanent magnets in double-layer interior permanent-magnet motors is optimized for variable-speed applications. First, the arrangement of magnets is decided by automatic optimization. Next, the superiority of the optimized motor is discussed by considering d- and q-axis equivalent circuits that take into account the magnetic saturation of the rotor core. Finally, experimental verification is carried out with a prototype motor. It is confirmed that the maximum torque of the optimized motor under both low-speed and high-speed conditions is higher than that of conventional motors because of the relatively large q-axis inductance and small d-axis inductance. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 183(4): 54–63, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22348
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