Abstract
This paper presents a novel hybrid-flux magnetic gear, which integrates a transverse-flux magnetic gear and an axial-flux magnetic gear into a single unit. Compared to its conventional counterparts, the proposed magnetic gear transmits a relatively high torque density. When compared to the transverse-flux magnetic gear, this new structure employs an extra iron segment between the low-speed rotor and high-speed rotor to modulate the magnetic field and contribute to the transmission of additional torque. A three-dimensional (3-D) finite element method (FEM) is used for the analysis of the magnetic field. In the paper a variables-decoupling method based on the sensitivity analysis of the design parameters is also presented to accelerate the optimization process of the proposed machine.
Highlights
Magnetic gears (MGs), as an emerging technology, are competing with mechanical gears in many applications as the former have no mechanical contacts, less mechanical loss and noise, as well as less maintenance [1,2]
In this paper the design parameters are divided into several groups based on the sensitivity analysis among them [19]
The optimization of these parameter groups can be processed in series, which can significantly reduce the number of objective function computation
Summary
Magnetic gears (MGs), as an emerging technology, are competing with mechanical gears in many applications as the former have no mechanical contacts, less mechanical loss and noise, as well as less maintenance [1,2]. A transverse-flux MG which has two rotors arranged side by side along the axial direction which interact by the magnetic flux flowing transversely across outer iron segments has been proposed. An axial-flux MG has been described, which is suitable for the applications requiring flat outside shapes and hermetic isolation between the input and output shafts [9]. Another axial-flux MG has been investigated, in which the ferrite magnets are arranged in a flux focusing configuration in order to increase the air-gap flux density [10]. The two rotors at the two sides interact by the magnetic flux flowing axially across the iron segments. The numerical method of FEM presents the advantage of taking into account the real geometry of the MGs as well as the magnetic saturation of the iron parts
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