Method and apparatus for instability detection and...

H - Electricity – 02 – P

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H02P 9/04 (2006.01) F02G 1/043 (2006.01)

Patent

CA 2571747

A Stirling engine (1) includes a reciprocating piston which drives an alternator to provide an electrical output (7). The current signal (7) is measured by a current monitor (60) and a fast Fourier Transform value is produced. The FFT of the current signal (7) has been found to be directly related to the stability of operation of the Stirling engine. As harmonic peaks in the FFT increase, this indicates that the stroke length of the piston is approaching or exceeding a safe maximum. Correction action, such as a reduction in heat to the Stirling engine, can be taken in consequence. A variety of stroke length detectors (110) are also disclosed, for use in combination with, or separately from, the FFT analysis of the current signal (7). Optical and mechanical switches and analogue sensors are disclosed, along with an accelerometer mounted upon the casing of the Stirling engine.

L'invention concerne un moteur Stirling (1) équipé d'un piston alternatif entraînant un alternateur générant une sortie électrique (7). Le signal (7) de courant est mesuré par un dispositif (60) de surveillance de courant et une valeur de transformation de Fourier est générée. La FFT du signal (7) de courant est directement associée à la stabilité d'exploitation du moteur Stirling. Les pointes harmoniques de l'augmentation de la FFT indiquent que la longueur de la course du piston se rapproche ou dépasse une valeur maximale de sécurité. Une action de correction, par exemple une réduction de la chaleur dans le moteur Stirling, peut être prise en conséquence. L'invention concerne également une pluralité de détecteurs (110) de longueur de course, utilisés en combinaison avec l'analyse de la FFT du signal (7) de courant ou séparément. L'invention concerne enfin des commutateurs optiques et mécaniques et des capteurs analogues, ainsi qu'un accéléromètre monté sur l'enveloppe du moteur Stirling.

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