AC electricaldynamometer is a key equipment of engine power-test system, whose load is mainly regulated by the excitation control system of electricaldynamometer.
交流电力测功机是发动机测功系统的重要设备，励磁控制系统是测功系统负载调节的主要控制装置。
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Aiming at the speed characteristics test, which is one of important test items of engine test, this paper proposes studies of ac electricaldynamometer and its control system.
AC electricaldynamometer is an important device for engine test with easy-controlled testing conditions, easy-collected and managed parameters as well as high measuring precision.