Abstract
Hybrid excited (HE) machines are a potential solution for wind power generation for their high efficiency from permanent magnet (PM) and good flux regulation ability from flexible field current. However, the principle and machine performance of different structures are diverse, which brings challenges in selection of machine topologies and in the dimensional parameter design. Hence, in this article, two machines with different topologies are presented and analyzed to show their merits and demerits. Both machines have relieving-DC-saturation PMs located in the slot openings, while only one of them has consequent rotor PMs to provide an auxiliary flux and to enhance torque production. In this article, the machine structure and working principle are presented, including the relieving-DC-saturation-relieving effect and air-gap field harmonic analysis. For a fair comparison, under the same outer diameter, rated current density, the dimensional parameters of two machines are optimized with genetic algorithm (GA). Further, the machine performance of the optimal models is compared in terms of torque production, back EMF, voltage regulation ability and speed range. The merits and demerits of both machines are summarized in the conclusion.
Highlights
INTRODUCTION permanent magnet (PM) machines have high torque density and efficiency, the relatively low flux regulation ability and poor flux-weakening performance limit their wide application in industry, especially in wind power generation system where wide speed range and good voltage regulation ability are usually required [1]–[3]
Aiming to improve the torque production of hybrid excited (HE) machines, different PM arrangements are investigated, which bring with different topologies of machine structure
In [16], both radially and tangentially magnetized PMs are employed. It provides the merit of relieving-DC-saturation effect from TMSPMs, and has a good torque production with the additional RMPMs in rotor
Summary
Permanent magnet (PM) machines have high torque density and efficiency, the relatively low flux regulation ability and poor flux-weakening performance limit their wide application in industry, especially in wind power generation system where wide speed range and good voltage regulation ability are usually required [1]–[3]. In [8]–[10], radially magnetized (RM) PMs are employed to provide an effective flux in armature windings to directly enhance the torque. The TMSPMs cannot directly produce effective flux in armature winding, it can relieve the stator core saturation by providing a constant biased flux in stator core, which promotes the stator core utilization and indirectly enhance the torque production. In [16], both radially and tangentially magnetized PMs are employed It provides the merit of relieving-DC-saturation effect from TMSPMs, and has a good torque production with the additional RMPMs in rotor. In this article, two HE machines with the same Vernier split-stator-tooth design, but different rotor pole arrangements are designed, optimized and compared in in terms of torque production, back EMF, voltage regulation ability and speed range. A comprehensive comparison is presented to show the merit and demerit of both structures
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