Q4: The block diagram of a motor-control system is shown in the figure. Find the range of k₁ constant so that the system is asymptotically stable. Ans.: stability range k, 20.081 R 10 100 s(s+5.6) (s + 10) kt s C
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- Hi .. This is simulation starting synchronous motor in matlab 2012 who can I find the power factor by use this simulation and what is the elemen add to find the power factorQ- A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5A without any ripple. The armature resistance is 2 Q. The converter is working from a 230 V, single-phase ac source with a firing angle of 30°. Under this operating condition, find the speed of the motor.The input current to a 220v, compound motor at no load is 6 A. The shunt field circuit resistance is 220 ohms; the armature resistance is 0.10 ohm and the series field resistance is 0.80 ohm. What is the SPL? A. 1153.31 W B. 1066.22 W C. 1232.54 W D. 1073.25 W
- Explain about (ZCS) zero current switching and (ZVS) zero voltage switching in steady state transient condition: a) Switching current and voltage of the switch b) output current and voltage at the loadQ5:- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately exciter DC motor to get a load torque that can be reached to 730 rpm. When the supply voltage of converter is 160 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 a and a constant back emf 04v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant.Q5. Two shunt generators operate in parallel to supply a total load current of 200A. Each machine has an armature resistance of 0.52 and a field resistance of 1002. If the generated EMFS are 200V and 210V respectively. Determine: I- Draw the circuit setup and determine the load voltage and load power II- Find the armature current of each machine and the power supplied.
- Q8/A three-phase semi converter is used to control the speed of a separately excited d.c. motor rated at 100 kW, 600V, 2000 rpm. The converter is connected to a 3- phase 400 V, 50 Hz supply. The armature resistance is Ra 0.051 ohm and the armature circuit inductance is La = 10 mH. The motor voltage constant is Ke = 0.25 V/rpm. The rated armature current is 100A and the no load current is 10A With the converter operates as a rectifier, and assuming that the motor current is continuous and ripple-free, determine: (a) The no load speed when the firing angles: a= 0° and a= 60°. (b) The firing angle to obtain the rated speed of 2000 rpm at rated motor current.Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately exciter DC motor to get a load torque can be reached to 750 rpm. When the supply voltage of converter is 150 volts per-phase and the absorbed current through the armature 40A with resistance 0.2 n and a constant back emf 0.4v/rpm. Then find the maximum speed for motor assume the previous parameters values are a constant. "Good Luck"A DC motor separately excited is used single-phase full converter to control the speed of a 5 hp, 110 V, 1200 rpm. The converter is connected to a single-phase 120 V, 60 Hz supply. The armature resistance is Ra=0.4 2, and armature circuit inductance is I-5 mH. The motor voltage constant is KO=0.09 V/rpm. Rectifier (or motoring) operation. The de machine operates as a motor, runs at 1000 rpm, and carries an armature current of 30 amperes. Assume that motor current is ripple-free. (a) Determine the firing angle a. (b) Determine the power to the motor. (c) Determine the supply power factor. Notes: losses in the converter are neglected, the power from the supply is the same as the power to the motor. S₁ S3 SA S₂ (u) VO E₂ R₁
- A DC chopper is used in regenerative breaking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continous and ripple free. What is the value of power feedback to the supply ?A de machine is controlled by the step-down de-de converter shown below. The armature inductance La =0.2 mH and the armature resistance can be neglected. The armature current is 5A. The Buck converter is operating at the switching frequency is 30 kHz and the duty ratio is 0.8. L₁ + Answer the following questions: 1) Calculate the input voltage (Va) if the output voltage (ea = 200 V). 2) Find the ripple in the armature current (a). 3) Calculate the maximum and minimum values of the armature current (la). 4) Sketch the armature current (ia (t)) and the supply current (id (t)).P5.10 A speed control system of an armature-controlled DC motor uses the back emf voltage of the motor as a feedback signal. (a) Draw the block diagram of this system (see Equation 2.66). (b) Calculate the steady- state error of this system to a step input command set- ting the speed to a new level. Assume that R, = L. = J = b = 1, the motor constant is Km = 1, and K, = 1. (c) Select a feedback gain for the back emf signal to yield a step response with an overshoot of 15%. %3!