G(s)H(s) = T(s) is called the open-loop transfer function. The magnitude of T(s) is the open-loop gain, sometimes called the loop gain, and T θ (s) is the phase of the open-loop gain or simply the ...

Part 3 examines the operation of a standard dc drive system with speed and current control. Part 4 looks at the performance, characteristics and control arrangements of chopper-fed dc motor drives.] D ...