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Consider a 3-hp, 220-V, 1800-r/min separately excited dcmotor controlled by a single-phase fully controlled rectifierwith an ac source voltage of 230Vat 60Hz.Assume that the full-load efficiency of the motor is 88%, and enough filter inductance is added to ensure continuous conduction for any torque greater than 25% of rated torque. The armature circuit resistance is 1.5 .
(a) Determine the value of the firing angle to obtain rated torque at 1200 r/min.
(b) Compute the firing angle for the rated braking torque at -1800 r/min.
(c) With an armature circuit inductance of 30 mH, calculate the motor torque for α = 60° and 500 r/min, assuming that the motor operates in the continuous conduction mode.
(d) Find the firing angle corresponding to a torque of 35 N·m and a speed of 480 r/min, assuming continuous conduction.
Q. Use (a) mesh analysis and (b) nodal analysis to determine the current through the 4-resistor of the circuit of Figure.
Q. Sampled-data and digital control systems? These differ fromthe continuous-data systems in that the signals at one or more points of the system are in the form of either a pu
Q. In a depletion MOSFET for which V P = 3 V and I DSS = 11mA, the drain current is 3mA when v DS is set at the largest value that will maintain ohmic region operation. Find v G
HOW TO DESIGN
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