Consider the single-phase induction motor of Example 9.5 operati In order to raise the starting torque, the single-phase induction motor of Problem 9.13 is to be converted to a capacitor-start, capacitor-run motor. Write a MATLAB script to find the minimum value of starting capacitance required to raise the starting torque to 0.5 N 路 m.
The voltage across a 100-uF capacitor is given by the The voltage across a 100-uF capacitor is given by the expression v(t)=120sin(377t) V. Find (a)the current in the capacitor and (b) the expression for the energy stored in the element.
The two capacitors shown in figure have been connected for some The two capacitors shown in figure have been connected for some time and have reached their present values. Determine the unknown capacitor Cs. a. 20µF b. 30µF c. 10µF d. 90µF
Data for the magnetization curve of the iron portion of Data for the magnetization curve of the iron portion of the magnetic circuit of the plunger actuator of Problem 3.12 are given below: a. Use the MATLAB poly fit function to obtain a 3’rd-order fit of reluctance and total flux versus mmf for the iron […]
Cylindrical iron-clad solenoid actuators of the form shown in fi The L/R time constant of the field winding of an 500-MVA synchronous generator is 4.8 s. At normal operating conditions, the field winding is known to be dissipating 1.3 MW. Calculate the corresponding magnetic stored energy.
Consider the two-phase motor of Example 9.3. a. Find the startin The equivalent-circuit parameters of an 8-kW, 230-V, 60-Hz, four-pole, two-phase, squirrel-cage induction motor in ohms per phase are Rl = 0.253 Xl = 1.14 Xm = 32.7 R2 = 0.446 X2 = 1.30. This motor is operated from an unbalanced two-phase, 60-Hz source whose […]
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Consider the rectifier system of Example 10.5. Write a MATLAB Consider the rectifier system of Example 10.5. Write a MATLAB script to plot the ripple voltage as a function of filter capacitance as the filter capacitance is varied over the range 3000ÂľF < c=””>< 105Âľf.=”” assume=”” the=”” diode=”” to=”” be=”” ideal.=”” use=”” a=”” log-scale=”” for=”” […]
Consider the half-wave SCR rectifier circuit of Figure supplied Consider the half-wave SCR rectifier circuit of Figure supplied from the triangular voltage source of Figure. Assuming the SCR to be ideal, calculate the rms resistor voltage as a function of the firing-delay time td (0 < td=””>
Consider the half-wave, phase-controlled rectifier system of Consider the half-wave, phase-controlled rectifier system of Figure. This is essentially the same circuit as that of Problem 10.8 with the exception that diode D1 of Figure has been replaced by an SCR, which you can consider to be ideal. Let R = 5O and Vs (t) = […]