The paper describes the design and construction of a novel axial-radial flux permanent magnet (PM) machine (ARFPMM). The structure presented in the paper combines dual-rotor axial-flux PM motor and radial-flux PM motor, with both axial and radial PMs and a common electromagnetic core. This core built by soft magnetic composite offers the pass for both radial and axial flux. A new technique called fan-ring shaped windings combines the fan-shape and ring-shape winding described in the paper to shorten the end-winding and customized for the machine. A simplified method is presented in the paper to design and optimize the machine, and have been validated with Finite Element Analysis (FEA). Some details on the design and structure of the machine are presented and a 5 KW ARFPMM is designed to discuss the performance and have been validated with Finite Element analysis (FEA).
Due to their inherent advantages such as low cost, robustness and wide speed range, switched reluctance machines (SRMs) have attracted great attention in electrical vehicles. However, the vibration and noise problems of SRMs limit their application in the automotive industry because of the negative impact on driver and passengers’ comfort. In this paper, a new control method is proposed to improve the vibratory and acoustic behavior of SRMs. Two additional control blocks —direct force control (DFC) and reference current adapter (RCA)—are introduced to the conventional control method (average torque control (ATC)) of SRM. DFC is adopted to control the radial force in the teeth of the stator, since the dynamic of the radial force has a large impact on the vibratory performance. RCA is proposed to handle the trade-off between the DFC and ATC. It produces an auto-tuning current reference to update the reference current automatically depending on the control requirement. The effectiveness of the proposed control strategy is verified by experimental results under both steady and transient condition. The results show that the proposed method improves the acoustic performance of the SRM and maintains the dynamic response of it, which proves the potential of the proposed control strategy.
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