Abstract
Design aspects of the trans-rotary magnetic gear (TROMAG) integrated rotary machine are discussed in this paper, with particular focus on optimizing system cost and weight. Analytical models are used for design of the TROMAG. Optimal designs of the rotary machine are found by using a population-based genetic algorithm and two-dimensional finite-element analysis and thermal considerations. Weight, volume, and cost of the resultant system are then compared with the Pareto-optimal set of a permanent magnet linear tubular machine that is designed for the same force and speed specification. It is shown in this paper that, for high-force low-speed reciprocating motion applications, an electromechanical motion system consisting of a TROMAG and a rotary electric machine can far surpass a conventional direct drive linear machine in terms of weight, volume, and initial and operating cost.
Highlights
THE last decade has witnessed intense interest in integrating magnetic gears and electric machines to achieve machine configurations that offer high torque density and high power factor
It was shown in this paper that for high-force, low-speed reciprocating applications, the electromechanical energy conversion system formed by integration of a trans-rotary magnetic gear (TROMAG) and a rotary permanent magnet (PM) machine can far surpass a conventional direct drive linear PM machine in terms of weight, volume, and material cost
The margin of advantage of MITROMAG over PM linear tubular machine (LTM) is very large: at 100 kN force with 1 m stroke, a MITROMAG can be an order of magnitude lighter and more compact than a PM LTM and three times less costly at once
Summary
THE last decade has witnessed intense interest in integrating magnetic gears and electric machines to achieve machine configurations that offer high torque density and high power factor. It was, the emergence of high torque density field-modulated magnetic gears that paved the way for development of the gear-integrated machines. The emergence of high torque density field-modulated magnetic gears that paved the way for development of the gear-integrated machines These gears generally consist of a set of ferromagnetic pole pieces inserted between two concentric rotors that have different number of permanent magnet (PM) poles. The applications that propelled the research on the rotary gearintegrated machines were mainly electric traction [3, 5] and wind turbines [6, 7]
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