Contents
A method is presented for increasing the starting torque of capacitor-run split-phase induction machines by the application of a positive temperature coefficient (PTC) resistor which is permanently connected in parallel with the capacitor. The method is applicable to split-phase induction machines without the necessity of connecting a starting capacitor or a starting switch in series with the posistor. — The steady state equations are derived and expressions of the starting torque and starting current are presented. It is shown that optimum starting conditions can only be obtained if the posistor is matched and there is a region where the mismatched posistor reduces the starting torque.
Übersicht
Es wird eine Methode gezeigt, nach der das Anfahrmoment eines Asynchronmotors mit Hilfe eines mit dem Betriebskondensator parallel geschalten Widerstandes mit positivem Temperaturkoeffizienten erhöht wird. Die Methode ist anwendbar bei Kondensatormotoren ohne Anlaßkondensator-und Hilfsphasenschalter. Gleichungen für den stationären Zustand für das Anlaßmoment und Anlaßstrom werden aufgestellt. — Die Publikation zeigt, daß man die optimalen Anlaßzustände bei einem angepaßten Widerstand erreicht, während bei Nichtanpassung das Anfahrmoment geschwächt wird.
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Rajki, I., Vas, P. Increasing the starting torque of capacitor-run split-phase induction machines by a positive temperature coefficient (PTC) resistor. Archiv f. Elektrotechnik 67, 65–69 (1984). https://doi.org/10.1007/BF01574733
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DOI: https://doi.org/10.1007/BF01574733