Abstract
Magnetic field regulation is a difficult and long-existing issue in surface-mounted permanent magnet synchronous machines (PMSMs). To produce effective and efficient flux regulation for PMSMs, a new topology, named a dual-structure parallel hybrid excitation machine (DS-PHEM), is presented in this paper. In this machine, the rotating permanent magnet (PM) excitation and stationary DC field excitation are artificially arranged and designed at the inner and outer magnetic circuits, respectively. Therefore, a decoupling and parallel feature is obtained between two excitation sources. This machine integrates the merits of a brushless structure and theoretically infinite constant power range, as well as zero risk of demagnetization. In this paper, the machine configuration is introduced, mainly focusing on some important design criteria for electromagnetic integration, and the operating principles of flux control are also analyzed in detail. To further verify the feasibility of the proposed scheme, the overall electromagnetic performance of the proposed DS-PHEM is evaluated by using the time-stepping finite-element method.
Highlights
Due to their high torque density and high efficiency, permanent magnet synchronous machines (PMSMs) have been widely investigated in recent decades [1,2,3]
The hybrid excitation machine (HEM), which employs both permanent magnet (PM) excitation and field excitation, has become a potential solution to solve the problem of magnetic field regulation [8,9,10]
This paper aims to present a novel dual-structure parallel hybrid excitation machine (DS-PHEM), aiming to provide a new solution for the field adjustment issue in surface-mounted PMSMs
Summary
Due to their high torque density and high efficiency, permanent magnet synchronous machines (PMSMs) have been widely investigated in recent decades [1,2,3]. In many variable speed applications, such as electric vehicle propulsion, good flux weakening capability and wide constant power speed range are usually required. For surface-mounted PMSMs, whose saliency ratio is equal to one, the flux weakening capability is very limited [4,5,6,7]. The hybrid excitation machine (HEM), which employs both permanent magnet (PM) excitation and field excitation, has become a potential solution to solve the problem of magnetic field regulation [8,9,10]. A review of three solutions is presented as follows
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