Abstract
This paper reports on the parallel running system which consists of an induction motor, a diesel engine, a gear train, and a loading generator. The two power sources are coupled rigidly in parallel to the loading generator through the gear train.
Usually, the torque output characteristics of a diesel engine are expressible by those of a constant-speed type because of the presence of the governor. The characteristics values, namely the speed droop rate and the speed without loading, are matched to the induction motor. The author evaluates the flexibility in the output characteristics of a diesel engine without a governor, which are constant-torque type characteristics for each rack stroke of the fuel injection pump. And the engine without a governor is coupled to the induction motor. Thus, the induction motor operates as the dominant power source in the system. The loading ratio of the power sources depends on the gain-constant of the servo-system that manipulates the rack stroke with adequate relations to the motor current. It is quite easy to change the loading ratio by selecting the gain-constant of the servo-system, while the system is in operation. In the paper, some additional notes on the system synthesis are included.
