Consider the dc-motor drive system of Problem 10.13. To limit Consider the dc-motor drive system of Problem 10.13. To limit the starting current of the dc motor to twice its rated value, a controller will be used to adjust the initial firing-delay angle of the SCR Bridge. Calculate the required firing-delay angle Îąd.
The inductor of figure has the following dimensions The inductor of figure has the following dimensions: Ac = 1.0 cm2 lc = 15 cm g = 0.8 mm N = 480 turns Neglecting leakage and fringing and assuming Âľr = 1000, calculate the inductance.
The inductor of figure has a core of uniform circular cross The inductor of figure has a core of uniform circular cross-section of area Ac, mean length lc and relative permeability Âľr and an N-turn winding. Write an expression for the inductance L.
Consider a separately-excited dc motor. Describe the speed varia Consider a separately-excited dc motor. Describe the speed variation of the motor operating unloaded under the following conditions: a. The armature terminal voltage is varied while the field current is held constant. b. The field current is varied while the armature terminal voltage is held constant. […]
The induction motor of Problem 9.9 is supplied from an unbalance The induction motor of Problem 9.9 is supplied from an unbalanced two phase source by a four-wire feeder having an impedance Z = 0.32 + j1.5O/phase. The source voltages can be expressed as Va = 235 < 0?,=”” va=””>
Consider the full-wave rectifier system of Figure with R = 500 Consider the full-wave rectifier system of Figure with R = 500 fl and C = 200ÂľF. Assume each diode to have a constant voltage drop of 0.7 V when it is ON but to be otherwise ideal. For a 220 V rms, 50 Hz […]
Consider Example 10.12 in which a current-source inverter is dri Consider the stepped voltage waveform of Problem 10.18 and Figure. a. Using Fourier analysis, find the value of D (0 < d=””>< 0.5)=”” such=”” that=”” the=”” amplitude=”” of=”” the=”” third=”” harmonic=”” component=”” of=”” the=”” voltage=”” waveform=”” is=””> b. Use the MATLAB ‘fit ( )’ function […]
Measurements on a small permanent-magnet dc motor indicate Measurements on a small permanent-magnet dc motor indicate that it has an armature resistance of 4.6O. With an applied armature voltage of 5 V, the motor is observed to achieve a no-load speed of 11,210r/min while drawing an armature current of 12.5 mA. a. Calculate the motor […]
In Section 8.2, when discussing Figure, the text states: In Section 8.2, when discussing Figure, the text states: “In addition to the fact that there are not positions of simultaneous alignment for the 6/4 VRM, it can be seen that there also are no rotor positions at which only a torque of a single sign […]
In a balanced two-phase machine, the two windings are displaced In a balanced two-phase machine, the two windings are displaced 90 electrical degrees in space, and the currents in the two windings are phase-displaced 90 electrical degrees in time. For such a machine, carry out the process leading to an equation for the rotating mmf […]