In recent years, significant patents have been devoted to developing control methods and apparatuses of permanent
magnet synchronous motor (PMSM). PMSM, as an energy converter, has been popular in a wide range of industry
for its tremendous advantages. The focus of this paper is to survey recent patents related to PMSM. Firstly, a general
overview of PMSM is provided. Then the structure and advantages of PMSM are introduced. Twelve patents since 2008
are collected, in which four deal with control method, four refer to apparatus design, and the rest involve the subjects of
both control method and apparatus design. Analysis and comparison are made to the evaluation of development of
PMSM. Lastly, the prospect of PMSM is presented.
Keywords: Initial position, PMSM, PMSM drives, position detection, resistance adaptation, stationary rotor, PMSM structure, PMSM advantage, magnet synchronous motor, principle.
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