A NEW MODEL FOR AC PLUNGER-TYPE MAGNETS IN STEADY-STATE REGIME
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
This paper proposes a new model for plunger-type magnets that could be used in SPICE simulations of some complex systems. The model uses a new advanced modeling technique of ferromagnetic cores that was developed in the last years in various technical papers. This technique is now adjusted to the AC plunger-type magnets that operate in the steadystate regime. The case that corresponds to the position “closed” of the electromagnet is analyzed. We considered a 230V/50Hz electromagnet as example to be studied. The constant parameters as well as the characteristic of the resistance forces and the hysteresis curve are obtained from the magnet design documents. A special attention was paid to the short-circuit ring, as position, dimensions and influence on the magnet operation. The simulation offered an image on the equipment behavior in the steady-state operation regime. Also comparisons and analysis can be made on the waveforms of the magnetic fluxes, currents or voltages and thus some important conclusions can be obtained. Magnetization cycle of the movable core, supply voltage waveform, coil current waveform, magnetic flux in the movable core, magnetic fluxes inside and outside the short-circuit ring as well as the current induced in the short-circuit ring are represented in a comparative manner in order to better analyze the results and to compare them with those presented in the technical literature. Finally some conclusions are depicted in order to improve the model and to generalize it for a class of electromagnets.
Authors and Affiliations
Ioana-Gabriela SÎRBU, Mihai IORDACHE, Lucian MANDACHE
Keywords
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