Five-Phase Version of 12Slots/8Poles Three-Phase Synchronous Machine for Marine-Propulsion

Abstract

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Five-phase SPM machine with electronic pole changing effect for marine propulsion

“…The following expression summarizes the optimization problem under consideration: * Fig.5 shows the resulting torque/speed characteristic corresponding to the resolution of optimization problem (10). It can be observed that the rated torque (about 34Nm) is obtained by using the virtual MM and the virtual SM in the same time, thus meaning that the five-phase machine here considered is designed to operate with first and third harmonic of current.…”

“…The 3-phase counterpart of this 20-8-5 machine has 8 poles and 12 slots (12-8-3 configuration). With reference to this 12-8-3 machine, the benefits of the 20-8-5 machine are examined in [10] for the same design specifications: rated torque, power and external diameters are identical. With numerical computations of the two machines, this study shows that the 5-phase configuration allows a significant reduction of the magnet losses.…”

Nonlinear optimal control for ship propulsion with the use of an induction motor and a drivetrain

“…Aiming at generating high torque, several types of electric motors have been considered, among which induction motors and multi-phase synchronous motors are frequently met [3]- [4]. By considering the dynamics of the drivetrain that transmits motion from the rotor of the electric motor to the propeller, a state-space model of elevated dimensionality is obtained [5]- [6].…”

Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force

“…The contribution of each harmonic is of the same order, and the choice of repartition between first and third harmonics has to be optimized regarding different objectives and constraints. To the knowledge of the authors, no multiphase machine with such a E 3 /E 1 ratio has been yet considered, except in [19,[35][36][37]. In [13,23,24], the ratio E 3 /E 1 in SPM machines was less than 33%, this value being obtained with square wave emf.…”

“…In [22], for the same five-phase machine as in [30], optimization is achieved in the flux-weakening area taking into account also iron and permanent magnet losses: previous results concerning the benefit of third harmonic injection even in the case of sinusoidal five-phase PM machines are confirmed. The work in [37] focuses on a particular bi-harmonic SPM machine with a ratio of E 3 /E 1 = 100% and with the same number of slots and poles as this one proposed in the paper. The necessity to consider not only copper, but also iron and magnet losses for the definition of the control strategy is demonstrated: if at low speed, supply by only the third harmonic leads to good performance, the losses in the permanent magnet are becoming too important at high speeds, and different repartitions between the harmonic of current must be considered.…”