Explain the basic structure and working principle of the induction motor controller.
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A: Derive the transfer function of Armature controlled DC shunt motor
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Explain the basic structure and working principle of the induction motor controller.
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- List some advantages of solid-state control.A voltage regulator is added to a synchronous generator for automatic field control. The voltage regulator is shown in figure 1. The generator is operating at 60 Hz, and the generator field resistance is Rf = 4Q. Voltage constant k. = 0.022 for the machine. a. The generator is originally loaded with a terminal voltage magnitude of V, = 275 V. In the controller, V = 280 V and Vo = 150 v. The controller has a constant gain of kỵ = 2.5. Find the field voltage V;, the field current I, and Ef. b. The load is changed, and after the field controller has adjusted the field voltage, the terminal voltage magnitude V; has dropped to 265 V. The controller inputs and gain remain the same. Determine the new value of Ef. Vro ey Ve ky Generator Figure 1. Voltage Regulator.Problem') A single-phase full-wave AC/AC voltage controller has input rms voltage Vs - 220 V,50 Hz, load R 100 2, and the firing angle a= 60° for the thyristors T1 and T2. Determine the output rms voltage VO and current IO, and the DPF.
- 1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either feed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution 4. The correct syntax of an NC block for inclined line milling operation is: A. N-G01 X-F B. N-G01 Z-F C. N-G01 X-Y F D. N-G01 M XY F 5. When the contour or continuous path system is used, A. Tool movement from one point to the next does not have to follow a specific path. 8. Tool travel is controlled along one axis at a time. C. Machine and tool movements are precisely controlled at all times and in all planes. D. None of the above. 6. Which of the following NC blocks is correct? A. N10 G01 M03 X90 Y-15 R22 B.…control system theory questionPlease solve last time rejected. For ac voltage controller type with an input of 230 V, 50 Hz is connected to a resistive load of 20 ohms. The circuit is operating with the switch ON for 30 cycles and OFF for30 cycles Determine1)r.m.s output current and2) input power factor.
- The supply voltage to a DC motor is 160V. If the back emf Ez=155V and the armature resistance A6 is 0.250, the armature current is a) 5A b) 10A c) 15A d) 20A 1800 ro/min The frequencyWhich machine the following equation is describing? Vs = Ris + V₁ + Vc A. Series RLC circuit B. Separately excited DC motor C. Permanent magnet DC motorWhy transient response? What is the importance of the transient response of a control system? ples write in deatil
- The armature circuit of a free excited direct current motor with a nominal voltage of 600 V is fed from an adjusted direct voltage source. The excitation circuit is also powered from a regulated voltage source. It is used in an application that requires motor speed adjustment. The speed of the motor at the nominal armature voltage was measured as 1600 rpm. All losses of the motor and voltage source and the effect of armature reaction are neglected. It is accepted that the engine is not saturated.Answer the questions below.a) Draw the armature and excitation circuit of the motor and write the formulas for the equivalent circuit.b) If the load moment of the motor at the nominal armature voltage is 420 Nm, then calculate the armature current and the input power of the motor.c) If the armature voltage of the motor is kept constant at 600 V and the excitation current is decreased until the speed reaches 4000 rpm, then calculate the shaft moment. Show this working area on the M = f (W) axis.1.a. In a DC servo motor system, the tachometer feeds back a voltage that’s proportional to motor speed.Where does this voltage go to?A. The interpolator cardB. The CPU in the main controllerC. The driverD. The axis logic card1.b. A type of feedback device that uses a rotor and senses the position of the motor by means of sine andcosine waveforms is called a/anA. tachometer.B. encoder.C. resolver.D. alternator.The system given in following figure, is an example for Gear Assembly for reducing shaft speed Position cog Output shaft DC Motor Potentiometer Feedback path PReference Output Signal Reference Input Signal Electrical Input to DC Motor Error detector ampifier O a. Process Control system b. Numerical control system c. Servomechanism d. Direct Digital Control System