Investigation of a Co-Axial Dual-Mechanical Ports Flux-Switching Permanent Magnet Machine for Hybrid Electric Vehicles

Abstract

Abstract:In this paper, a co-axial dual-mechanical ports flux-switching permanent magnet (CADMP-FSPM) machine for hybrid electric vehicles (HEVs) is proposed and investigated, which is comprised of two conventional co-axial FSPM machines, namely one high-speed inner rotor machine and one low-speed outer rotor machine and a non-magnetic ring sandwiched in between. Firstly, the topology and operation principle of the CADMP-FSPM machine are introduced; secondly, the control system of the proposed electronically-controlled continuously-variable transmission (E-CVT) system is given; thirdly, the key design specifications of the CADMP-FSPM machine are determined based on a conventional dual-mechanical ports (DMP) machine with a wound inner rotor. Fourthly, the performances of the CADMP-FSPM machine and the normal DMP machine under the same overall volume are compared, and the results indicate that the CADMP-FSPM machine has advantages over the conventional DMP machine in the elimination of brushes and slip rings, improved thermal dissipation conditions for the inner rotor, direct-driven operation, more flexible modes, lower cogging torque and torque ripple, lower total harmonic distortion (THD) values of phase PM flux linkage and phase electro-motive force (EMF), higher torque output capability and is suitable for the E-CVT systems. Finally, the pros and cons of the CADMP-FSPM machine are highlighted. This paper lays a theoretical foundation for further research on CADMP-FSPM machines used for HEVs.

Comparative Evaluation of a Permanent Magnet Machine Saliency-Based Drive with Sine-Wave and Square-Wave Voltage Injection

“…Figure 1 illustrates ΣL and ∆L with respect to the inductance waveform versus position. The superscript e' in (2) represents the estimated synchronous rotor frame while θ err is the position error between the estimated rotor frame and the actual frame. The relative location between these two rotor frames is shown in Figure 2.…”

“…Permanent magnet (PM) machines are widely used in applications on multi-axis machine tools due to their high dynamic response and high torque density [1][2][3][4]. Considering manufacturing using machine tools, the machining allowance should be limited within a 6~320-mm diameter.…”

Analytical modeling of axial flux PM machines with eccentricities

“…They can be designed to have a higher power-to-weight ratio resulting in less core material and they are easy to adjust the air gap [1], [2]. Moreover, AFPMMs are smaller in size compared to the RFPMM counterparts, this particular structural characteristic makes them easy to match the space limitation in some applications such as electric vehicles (EV), hybrid electric vehicles (HEV) [3], wind turbines [4] and flywheel storage system [5]. However, due to the smaller contact surface between the rotor and the shaft, AFPMM becomes more difficult to design a rotor-shaft mechanical joint with high mechanical integrity [6].…”

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

“…The proportion of windage losses is usually moderate, albeit not completely insignificant [5]. The electromagnetic analysis of an AFPMSM has been widely addressed [6][7][8][9][10]. For instance, several analytical models were developed to compute the iron losses accurately and in a fast way by Hemeida and Sergeant [11].…”