Abstract

CALLEJA-GJUMLICH, J.H.; GUERRERO-RAMIREZ, G.V  and  JIMENEZ-GRAJALES, H.R.. Maximizing the Operational Life/Volume Index in Filters Used in Adjustable Speed Drives. Ing. invest. y tecnol. [online]. 2011, vol.12, n.3, pp.329-336. ISSN 2594-0732.

Reliability is a main issue in standard adjustable-speed drives. The electrolytic capacitor, part of the low-pass filter in the DC-link, has been blamed as a failure-prone component, and several approaches have been followed to improve the reliability. A popular strategy to improve the operational life consists in derating the capacitor, to higher nominal voltages. The drawback of the approach, however, is that it produces larger apparatuses. In this paper, the ratio "Operational Life/ Volume" is proposed as an index to evaluate a particular design. The index can be maximized following a methodology based on the design of experiments technique. An example developed for a 5 kW motor drive shows that the index can be improved by designing the filter at lower cut-off frequencies.

Keywords : reliability; adjustable speed drives; operational life; volume; capacitors; inductors.

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