Abstract
This paper discusses some design issues of a magnetic rotating to linear motion converter (RLMC), suitable for the propulsion system of a short-distance low-capacity vehicle. It basically operates like a magnetic rack, which executes the contactless conversion of the motor torque into a propulsion thrust, deriving from the interaction of on-board permanent magnet (PM) modules and stationary ferromagnetic steel pieces. A design procedure is set up that deals with both the PM module arrangement and the geometric shape of the steel pieces to optimize different performance aspects. A simplified modeling based on 2D transient finite element analyses is carried out to determine the thrust profile and the RLMC losses, which are essential to assess its practical feasibility. Finally, the characteristics as functions of the load angle and speed are determined to enable the prediction of the dynamic power exchange and then of the net energy demand useful to size the on-board source.
Highlights
Magnetic gear (MG) technology is attractive as a replacement of the conventional mechanical gears with the purpose to fulfill some binding application requirements
The proposed magnetic device integrates the features of a conventional magnetic gear with a contact-less rotating to linear motion enabling to drive efficiently and reliably linear moving loads
The possibility of using conventional rotating equipment, inexpensive and low environmental impact passive guideway and cost-effective magnetic materials gives a significant advantage with respect to other proposed magnetic gear configurations and suggest a profitable application for vehicle propulsion systems, especially if operating on sloped routes
Summary
Magnetic gear (MG) technology is attractive as a replacement of the conventional mechanical gears with the purpose to fulfill some binding application requirements. Two possible design approaches can be recognized: The MG integration in the electrical drive to enhance the volumetric torque density in low-speed high torque power conversion and to achieve a better exploitation of the PM material and a simple construction [10,11]; The replacement of the mechanical gear to improve the system efficiency, reliability, and quietness, as well as the mass torque density [12,13] Another potential MG application consists of the conversion of the rotating to linear motion with the aim to couple a rotating high-speed drive to a low-speed translational load. Such analyses enable to optimize the shape of the MRSPs and to determine the electromagnetic performances as functions of speed and load angle, used to estimate the size of the on-board energy source
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