A four-pole, 25kW , 250V separately excited DC motor is mechanically coupled to a threephase four-pole, 25kW, 460V, cylindrical pole synchronous generator. The DC motor is connected to a constant 250V DC supply and the ac generator is connected to a 460V fixed voltage, fixed frequency, threephase grid. The synchronous reactance of the synchroous generator is 6.6 Ω. The armature resistance of the DC motor is 22 mΩ. All unspecified losses are to be neglected.

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