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The dual three-phase induction motors can eliminate the pulsing torque of 6 times the fundamental frequency. In order to acquire more improvement, the lowest pulsing frequency should be increased further while the magnitude decreased. Torque pulsation is caused by the harmonic currents of order 6nplusmn1 (n=2, 4......). So the key to eliminating the pulsation is reducing the substantial harmonics...
Permanent magnet machines with windings concentrated around each tooth gain more and more importance. In this paper, the magnetomotive force of a three-phase winding with concentrated coils will be analysed. As an example, a machine with a two-coil zone width with opposing flux is regarded. It will be shown that there are two different winding alternatives with four different rotor pole numbers that...
The implementation of concentrated windings in interior permanent magnet (IPM) machines has numerous advantages over distributed windings, with the disadvantage being mainly the decrease in saliency ratio. This paper presents a proposed finite element (FE) method in which the d- and q-axis inductances (Ld and Lq) of the IPM machine with fractional-slot concentrated windings can be accurately determined...
The general methods of analysis and study for multi-phase permanent magnet synchronous motor (PMSM) variety speed system based on the vector space decomposition theory are discussed in this paper. Furthermore, the reliability of the system is discussed and a fault-tolerant compensation strategy purposed forming the revolving magnetic field in order to solve the system occurred familiar faults is also...
This paper presents a new equivalent circuit for the brushless doubly-fed machine (BDFM) which is suitable for the steady state studies of the machine and the BDFM for adjustable speed drive systems. Based on the fundamental equivalent circuit for the BDFM and the chain equivalent circuit, the new equivalent circuit is developed for the investigation of the BDFM harmonic influence. Simulation results...
Compared with their three-phase counterparts, multiphase machines with phase number n ges 5 have many advantages like lower torque pulsation, higher power density, better fault tolerance, etc. Due to these advantages and the increasing demands on high performance and high power adjustable speed drives, the research on multiphase drives has experienced a significant growth since the end of last century...
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