Abstract
Potentials and limits of the Hybrid-Excitation Permanent-Magnet (HEPM) synchronous machine are dealt with in this paper. A six-pole machine is taken into consideration, and both parallel and series configurations are analysed and compared. Taking advantage of the rotor excitation coils, the permanent magnet (PM) rotor flux can be adjusted according to the operating speed to improve its performance parameters. The electro-magnetic force is analysed in its first harmonic and in the complete shape. Moreover, a comparison between analytical and numerical formulation has been done for the rotor current control. In particular, the speed range is extended, and electro-mechanical torque and power are increased, as well as the efficiency. It will be shown that the rotor flux reduction by using the excitation winding yields an improvement of the motor performance. The main advantage will be obtained during the flux-weakening operations. In this paper, different rotor topologies will be analysed to highlight the advantages and drawbacks of each of them, and how it is possible to achieve higher speed with higher torque and without high saliency ratio. A magnetic network will be introduced to explain the different contribution of the excitation winding to the rotor flux. Furthermore, a comparison of the amount of the volume of PM, copper and iron in internal permanent magnet (IPM) motor and HEPM motor will be analysed. Actually, an analysis of the harmonic content in the electro-motive force even varying the excitation current and a mechanical stress analysis of each machine will be shown. Finally, it will be verified that the excitation losses represent a minimum component of the total losses.
Highlights
The growing interest in the electrification of the automotive industry is spurring the development of new efficient electric and electronic components, such as electric vehicle drives [1,2], wireless charging systems [3,4,5], and converters [6]
Interior permanent magnet (IPM) synchronous motor drives fed by currentregulated inverter are mainly adopted
The aim of this paper is to investigate an alternative to the IPM synchronous motor drive
Summary
The growing interest in the electrification of the automotive industry is spurring the development of new efficient electric and electronic components, such as electric vehicle drives [1,2], wireless charging systems [3,4,5], and converters [6]. New HEPM motor configurations are compared to conventional IPM motors in terms of torque and speed capabilities [37,38] In such papers, there is not a complete study of the performance of motors with hybrid excitation, that is, considering both PMs and wound field. The main contributions of this paper are: to verify that the rotor flux reduction yields an improvement of the performance of the motor during the flux-weakening operations, to verify that with less saliency ratio, it is possible reach high speed with high torque and almost constant power, above the base speed, to compare different rotor topologies (series and parallel configuration) in order to highlight the advantages and drawbacks of each one, to introduce a magnetic network that is used to explain the different contribution of the excitation winding to the rotor flux, to verify that the harmonic content in the electro-motive force is reduced even varying the excitation current, and the excitation losses represent a minimum component of the total losses. The paper describes the study process carried out to demonstrate the advantages introduced by the hybrid configuration compared to the permanent magnet configuration
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