Open AccessModel predictive control of a free piston compressor/expander with an integrated linear motor/alternator
Author(s) -
Sergei Gusev,
Davide Ziviani,
Michel De Paepe
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/604/1/012076
Subject(s) - linear motion , crank , linear motor , linear congruential generator , reciprocating compressor , reciprocating motion , control theory (sociology) , piston (optics) , linear actuator , mechanical engineering , computer science , acceleration , automotive engineering , robustness (evolution) , gas compressor , engineering , actuator , magnet , electrical engineering , cylinder , control (management) , physics , biochemistry , chemistry , optics , classical mechanics , wavefront , artificial intelligence , gene
Linear positive displacement machines are becoming increasingly more attractive for applications that are normally known as unconquerable niches of rotary and scroll machines. Free-piston machines are characterized by the absence of a crank mechanism, since there is a direct transformation of electrical energy into the piston movement. From the point of view of manufacturing, these machines benefit from a higher robustness and reliability because of less mechanical components involved and reduced frictional losses associate with a conventional crank mechanism. However, the major challenge in replacing the rotary machines by linear ones is a lower efficiency at lower speeds which is unavoidable because of the nature of linear motion: continuous operation means a reciprocating movement within a stroke length with significantly long periods of acceleration and deceleration when the speed is far from its optimal value. However, the advantage of free-piston machines is the fact that the motion profile is freely configurable within physical constraints, which provides a possibility to optimize the speed given the efficiency map of particular linear motor. While the methods and results of the efficiency assessment for rotary machines are widely available, there is a lack of these analyses for linear machines. The current study provides in-depth analyses of a double-coil iron core linear motor also acting as a generator.