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Consider a permanent-magnet dc motor with the following parameters: Ra=0.35Ω, La=1.5 mH, Ke=0.5 V/(rads/s), Kt= 0.5 Nm/A, and Jm= 0.02 Kg.M^2. The rated torque of this motor is 4Nm.
Part A) Plot the steady state torque-speed characteristics for Va=100V, 60V, and 30V.
Part B) If the motor is supplied by a switch-mode dc-dc converter which has a dc-bus voltage of 200V. The switching frequency fs= 25 kHz. Calculate and plot the waveforms for Va(t), Ea, Ia(t), and Id(t) under the following conditions:
Part 1) Motoring in forward direction at a speed of 1,500 rpm, supplying a load of 3Nm
Part 2) Regenerative braking from conditions in part 1, witha current of 10A.
consider a system with a 0.1mw transmit power unit gain for the transmit and receive antennas operating at 50 mhz carrier frequency with a 100khz bandwidth.the system operates in a suburban environment.
a transmission line is characterized by an effective signal wave frontvelocity of Vw=c/3. calculate the time delay required in pico seconds for a signal to propagate end to end on a line that is 30cm long.
The output capacitor in a certain resonant converter sees the net current equal to 40cos(50,000 pi t) A. What value of capacitance will be needed to keep the voltage variation below 5V peak-to-peak
Design finite state machine that starts with even number of 1s and followed by odd numbers of 0s. Design finite state machine that starts with odd number of 1s and followed by even numbers of 0s.
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 9.38 m/s when going down a slope for 3.89 s (b) How far does the skier travel in this time
Design an analog divider circuit with a minimum number of op amps with Vo = f(V1/V2) where V1 and V2 are inputs of the circuit and Vo is the output and derive Vo in terms of V1 and V2 and the circuit elements.
A single-phase circuit is placed across a 120-V rm, 60-Hz source, with an ammeter, a voltmeter, and a wattmeter connected. The instrucments indicate 12 A, 120 V, and 800 W, resppectively. Find (a) the power factor, (b) the phase angle
A common-emitter amplifier with an emitter resistance RE, but without an emitter by-pass capacitor CE is good for high input resistance, common-emitter amplifier using an emitter by- pass capacitor is good for high voltage gain
RC series circuit c=10,r=1,vs=15 and intial capictor charge q(0)=0.01. write standard form of the diffierential equations which describe the capictors charge q(t) t>0, obtain integration factor u(t),and determine general solution for q(t)
Using the exponential formula for a charging circuit and assuming an initial voltage of zero volts across the capacitor, calculate the voltage across the capacitor at a. t = 1.5 seconds b. t = 2.5 seconds
A series-resonant RLC circuit has R = 80 (ohms), L=25mh, and C=10pF. A) Sketch and label the circuit. B) Find fo, the resonant frequency. C) At what frequency is impedance a minimum D) What is the magnitude of the impedance at this frequency
In addition, you have a 32-Kbyte Flash chip, a 16-Kbyte SRAM chip, and a 16 KByte DPRAM chip. You want to locate the FLASH chip right in the beginning of the address space, the SRAM chip just after it, and the DPRAM at the end of the address space..
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