A separately excited dc generator has the following parameters: R f = 100 Ω,L f = 20 H, R a =…

A separately excited dc generator has the following parameters: Rf = 100 Ω,Lf = 20 H, Ra = 0.1 Ω,La = 0.1 H, and Kg = 100 V per field ampere at rated speed. The load connected to the generator has a resistance RL = 4.5 Ω and an inductance LL = 2.2 H. Assume that the prime mover is rotating at rated speed, the load switch is closed, and the generator is initially unexcited. Determine the armature current as a function of time when a 230-V dc supply is suddenly applied to the field winding, assuming the generator speed to be essentially constant.

 

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