Frequency control of linear motors

H - Electricity – 02 – P

Patent

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Details

H02P 25/06 (2006.01) F25B 49/02 (2006.01) H02K 33/00 (2006.01) H03K 17/68 (2006.01)

Patent

CA 2344356

An electrical driver (10) for a linear electrical motor which drives a linear refrigerant compressor (11) that has a resonant frequency includes a sensor (22) for measuring the magnitude and polarity of the back EMF of the electrical motor at the beginning and/or end of the stroke of the compressor (11). A control circuit (12) analyses the measured back EMF to determine whether the driver frequency is higher or lower than the resonant frequency of the compressor (11) and then adjusts the frequency of the driver (10) to or closer to the resonant frequency of the compressor (11).

Entraînement électrique (10) d'un moteur électrique linéaire, qui entraîne un compresseur (11) frigorifique linéaire ayant une fréquence de résonance, comprenant un capteur (22) destiné à mesurer l'amplitude et la polarité de la f.c.é.m du moteur électrique au début et/ou à la fin de la course du compresseur (11). Un circuit de régulation (12) analyse le f.c.é.m mesurée pour déterminer si la fréquence de l'entraînement est supérieure ou inférieure à la fréquence de résonance du compresseur (11), puis règle la fréquence dudit entraînement (10) sur la fréquence de résonance du compresseur (11) ou de façon à la rapprocher de ladite fréquence de résonance.

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