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(Solved): Please answer and explain Q4b) DC-DC Converter Machine Drive Consider the circuit diagram of the DC- ...



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Please answer and explain Q4b)

DC-DC Converter Machine Drive Consider the circuit diagram of the DC-DC converter and separately excited DC machine in Figure 1. The parameters of this drive system are as follows: The converter can be considered as lossless. Take further the brush voltages as zero in the calculations. Figure 1: Circuit diagram of DC-DC converter and DC motor. 1. Calculate the highest shaft speed that can be obtained with this DC machine drive. 2. With a duty cycle of and armature current of calculate the speeds of the DC motor drive with two-quadrant and four-quadrant switching. 3. Calculate the supply powers of the converter to the DC machine for the operating condition of (2) with two-quadrant and with four-quadrant switching. 4. With permanently switched off and permanently switched on answer the following questions: (a) With the DC-machine operating in steady state at and the armature current equals to -10 A (current flowing out at terminal ), determine the switching duty cycle at which the converter is switched. (b) For the condition of (a) determine the ripple in the armature current . (c) For the condition of (a) draw the waveforms of the armature voltage, , and the armature current reasonable on scale on one graph.


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