Study of multiphase permanent magnet synchronous motor drive technology (Chinese academy of sciences doctoral dissertation) at present, the three-phase motor driven system in electric drive applications has been widely used, but with modern power electronics technology, computer technology and the development of control theory, by the number of phase inverter power supply of motor drive system is limited by the number of power supply in no longer. Especially in high power, high reliability and low dc voltage power supply applications, multiphase motor drive system is much more advantage than three-phase motor drive system, so the multiphase motor drive system is especially suitable for application in ship electric propulsion, electric vehicles, aerospace and military, etc. The research of its related technologies has opened up new areas for the research of electric drive technology, and the multi-phase motor drive system has been paid more and more attention and attention by researchers from different countries. In this paper, we study from any number multiphase motor phase, mainly studies the five phase permanent magnet synchronous motor drive system, the full text main content is as follows: the introduction of the quantitative analysis of the random phase winding function theory of the symmetric winding harmonic magnetic potential space-time distribution, and illustrates the low-order space-time harmonic in the important role of multiphase motor First promotion of park transformation is deduced from the symmetrical component method, and set up n - m phase induction motor mathematical model, points out that the multiphase motor control is a multidimensional control problem. These basic theoretical knowledge lays the theoretical foundation for the analysis of multiphase motor. In this paper, the coupling of d-q subspace and generalized zero-order subspace in five-phase permanent magnet synchronous motor is studied. According to the characteristics of the five phase permanent magnet synchronous motor in different structures, the multi-dimensional vector control and decoupling control problems in different situations are discussed in detail. However, with the advent of modern power electronics, computertechniques and control theories, the inverter-fed motor drives remove the limitation of power supplies and machines. Especially In the applications ofhigh power, high reliability, and low dc bus voltage, multiphase drives show severaladvantages over three-phase drives.

multiphase machine_MMF harmonics.kdh

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