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This paper presents an alternator model suitable for electric power management research. The proposed model estimates the alternator driving torque under various driving conditions, such as engine speed, output current, and generation voltage. The base equations of the proposed model are derived from the equivalent circuit and the phasor diagram of the field-wound-type synchronous generator. Model parameters that affect power conversion efficiency were defined and identified through open and short load tests on a bench. Validation tests were also performed to evaluate model accuracy under several representative driving conditions. Through a case study, we show that the proposed model is the effective way to research power management.