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Three-phase synchronous machines account for a high percentage of this country’s power generation. Understanding the machine’s behavior and determining its equivalent network and performance characteristics are of prime importance to a power engineer. This experiment studies the characteristics of doubly-excited synchronous motors and generators. Specific tests are run to determine equivalent circuit parameters, torque, and power factor control. This lab shows that system design considerations must include frequency, speed, power factor, and voltage. Also illustrated are important machine design parameters including linear versus non-linear magnetic characteristics and efficiency.