This paper introduces a new thermal model that can be used for design, protection, efficiency maximization, and speed estimation of an electric vehicle interaction machine drive. The model can predict the machine winding temperature even in transient conditions. The proposed thermal model of the machine is represented by an equivalent electric circuit. Then the thermal equations are derived and used for temperature estimation. Two techniques for temperature estimation is proposed. The first technique is based on prediction of the winding temperature from the machine frame temperature. In second method, the winding temperature is estimated from the ambient temperature. In order to investigate transient behavier of the winding temperature, the temperature dependent model of the EV drive has been simulated to calculate the winding temperature when the vehicle is driven under different leads and applied torques. The predicted temperature from the thermal model has also been compared with the actual measurements and found to agree very closely with measured velues. It is shown that this thermal model can be used for design and protection of electric vehicles. Another important issue that is addressed in this paper is effiency optimization by using the predicted temperature from the thermal model. The system efficiency is improved by choosing an appropriate flux level for each speed, torque, and winding temperature.
A new thermal model for EV induction machine drives
Ein Simulationsmodell zur Darstellung der Temperaturbelastung von asynchronen Antrieben für Elektrokraftfahrzeuge
1996
8 Seiten, 10 Bilder, 1 Tabelle, 10 Quellen
Aufsatz (Konferenz)
Englisch
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