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.
Highlights
In order to conquer the disadvantages of the planet gear-based continuously-variable transmission (CVT) systems used in hybrid electric vehicles (HEVs), such as gear noise, lubrication and maintenance, a series of dual-mechanical ports (DMP) machines is proposed, and the electronically-controlled continuously-variable transmission (E-CVT) system is put forward to replace the planet gear-based system
Longya Xu in [5], where the DMP machine is comprised of three main components, namely an outer stator with evenly-configured three-phase-distributed armature windings, an outer cup-type rotor with two layers of permanent magnets (PMs) surface mounted on the inside and outside of the rotor lamination and an inner wound rotor with evenly-configured three-phase distributed windings
A novel structure of a flux-switching permanent magnet-based double-rotor machine (FSPM-DRM) was proposed in 2014 [7], which is comprised by two individual FSPM machines with more sinusoidal phase back electro-motive force (EMF) waveforms and a higher torque density than that of the 4QT; whereas the armature windings and PMs of the inner FSPM machine are installed in the inner rotor, which will reduce the structural strength and increase the difficulty of heat dissipation; it still needs brushes and slip rings
Summary
In order to conquer the disadvantages of the planet gear-based continuously-variable transmission (CVT) systems used in hybrid electric vehicles (HEVs), such as gear noise, lubrication and maintenance, a series of dual-mechanical ports (DMP) machines is proposed, and the electronically-controlled continuously-variable transmission (E-CVT) system is put forward to replace the planet gear-based system. A novel topology of a co-axial dual-mechanical ports flux-switching permanent magnet (CADMP-FSPM) machine is proposed in [9], which overcomes the shortcomings existing in the previous DMP machines and provides a new concept to construct the E-CVT system. The CADMP-FSPM machine consists of an outer FSPM machine and an inner FSPM machine co-axially configured, where the inner FSPM machine is essentially an inner rotor FSPM machine and directly coupled to the ICE, and the outer FSPM machine is essentially an outer rotor FSPM machine and directly coupled to the power train of the drive system without gears Both rotors of the inner and outer FSPM machines are made of only salient pole laminations without magnets nor windings, and the brushes and slip rings are removed.
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