E-Effect of excitation on armature current and power factor in synchronous motor.
Q: A certain 5.5kW, 125V DC long shunt compound generator was operated as a shunt motor at no load for…
A: For a DC long shunt compound generator,P=5.5kWV=125VThe generated EMF is,E=135VThe speed is,N=1700…
Q: The direction of rotation of Series DC motor can be reversed by interchanging terminal(s). 1) Field…
A: The change in the flow of current divert the direction of the spinning force, due to this the…
Q: Field winding resistance of DC shunt motor compared to its armature resistance is Equal Samller…
A:
Q: Discuss the variable-speed operating regimes for a synchronous motor.
A: We need to discuss the variable-speed operating regimes for a synchronous motor.
Q: Application of Synchronous motor ?
A: Some application of Synchronous machine: Power factor improvement Voltage regulation Constant-speed…
Q: load, ascertain whether it is running at lagging power factor or a leading power factor without the…
A: An AC motor is an electrical machine which takes AC electrical input energy and produces mechanical…
Q: a. Explain the principle of operation of a shunt DC motor b. Give a brief description of a…
A: (a). Due to the current flowing in the armature winding, we have magnetic flux. The field winding…
Q: in Speed Control of Three Phases I.M. by Variation of Rotor Resistance Explain why pole changing…
A: The speed control of the three-phase induction motor by the variation of rotor resistance: - The…
Q: What are the advantages of shunt de motor?
A: A DC shunt motor is the motor which is self excited in nature and the field connection is in…
Q: true or false: Because synchronous motors are often made to have a leading power factor by…
A: The solution is given below
Q: Q/ Explain how can the power factor of a synchronous motor be changed from Leading to lagging or…
A: Leading power factor- this power factor is used, when the load current leads the supply voltage.…
Q: Draw and explain the block diagram for speed control of an Induction machine by variable voltage…
A: Speed Control of IM There are many methods to control the speed of IM. Variable Voltage Control…
Q: What are the reasons for the drop in terminal voltage of self excited shunt generator When loaded?
A: With increases in the load, the terminal voltages of all dc shunt generators decrease.
Q: ) A 50 MVA, 30 kV, three-phase, 50 Hz synchronous generator have a synchronous reactance of 9 Q per…
A:
Q: What is the mathematical model of a DC motor with describing variables: armature circuit voltage and…
A: A DC motor is an electromechanical device that converts electrical energy to mechanical energy. The…
Q: 1.) A certain 5.5 kW, 125-V DC long shunt compound generator was operated as a shunt generator motor…
A: Given: Armature resistance, Ra=0.2 ΩSeries field resistance, Rse=.25 ΩShunt field resistance, Rsh=25…
Q: (B) / Explain the speed control methods of DC shunt motor.
A: In speed control of DC shunt Motor, As, N∝V-IaRaϕN is speed, V is supply voltage, Ia is armature…
Q: Questions:- 1-why does the speed fall slightly when the d.c. shunt motor is loaded? 2- what is the…
A:
Q: Questions: 1 - why does the speed fall slightly when the d.c. shunt motor is loaded? 2- What is…
A: As per policy attempting only first question (1) (i) There are two different explanation for this…
Q: What will be the effect of increasing the mechanical load on a synchronous motor? Assume the field…
A: A synchronous motor is a synchronous machine that converts electrical power to mechanical power at a…
Q: The characteristic (Speed versus armature current) of a dc shunt motor is known as the electrical…
A: The electrical characteristics are,
Q: 3- Why does a cumulatively compound D.C motor at light load behave approximately as a shunt D.C and…
A: The torque-speed (c/s) of a cumulatively compound D.C motor At light loads, the series field has a…
Q: How high is the rated torque of the separately excited shunt wound de motor?
A: DC Motor DC motor is a rotating electrical machine that converts direct current electrical into…
Q: The field winding resistance of DC shunt motor compared to its armature resistance is Very high…
A: In this answer we will try to find about different windings in the DC machine as shown below and…
Q: What effect does varying the DC incitation have on the stator currents of a synchronous motor?
A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…
Q: What is the typical speed regulation on a synchronous motor?
A: Consider that the synchronous motor is a motor that rotates with synchronous speed.
Q: Field winding resistance of DC shunt motor compared to its armature resistance is O Equal Samller…
A: In a DC Shunt motor, there are two windings, 1. Armature winding(it has armature resistance) 2.…
Q: 2. In a DC shunt motor, what will be the armature current at maximum load?
A: In the DC shunt motor, the armature current is given by, Ia=IL-If Where Ia is armature current, If…
Q: Phasor Diagram of Salient Pole Synchronous Motor for unity power factor
A:
Q: Speed current characteristic of cumulative DC compound motor at larger values of armature current is…
A: The Emf generated in DC machine is proportional to the product of flux and speed of the machine. The…
Q: you mean by 'V-curves' of a synchronous motor? Draw them showing leading power factor and lagging…
A: In this we will write about V curve...
Q: How the field control used in series dc motor
A: For the DC series motor speed equation is given by N=Ebk∅ .............(1)where Eb=V-IaRa= back emf…
Q: Explain the effect of varying excitation upon the armature current and power factor of a three-phase…
A:
Q: Compensating winding does not solve the problem of armature reaction completely then why do use in…
A: Compensating winding is used in DC motor for eliminating the problems of armature reaction and…
Q: 1-why does the speed fall slightly when the d.c. shunt motor is loaded? 2- what is the effect of…
A: Hello. Since you have posted multiple questions and not specified which question to solve. We will…
Q: . What is the effect of the field excitation to the back emf of the synchronous motor?
A: Synchronous motor- It is an electric motor which is operated at AC supply. As the name suggest, its…
Q: 4. What advantage you can obtain from an over excited synchronous motor at no load?
A: Over Excited Synchronous Motor If DC field excitation of synchronous motor is such that back EMF…
Q: What is the relationship between asynchronous motor speed (n), load (Pa)?
A: In the induction motor relationship between asynchronous motor speed (n) and load power Pa
Q: 3. How does exceeding the pull – out torque affect the synchronous motor? 4. How can a self- start…
A: 3. When load to be increased then the torque angle also increases until the conditions arises when…
Q: a) Does the slip increase as the load increases in an asynchronous motor? What is the reason of…
A: Ans (a) In induction motor , Rotating magnetic field of a stator winding passes through a rotor…
Q: O Explain the reason how AC Commutator motor is operated with DC or single phase AC. e Explain how…
A: Commutator is feature of DC motor. However, AC motor with wound rotor with brushes and commutator…
Q: what is the block rotor test of three phase induetion motor? 2-draw the equirlent circuit of…
A: In the blocked rotor test, it should be kept in mind that the applied voltage on the stator…
Q: a). Speed characteristics of dc series motor along with suitable diagram. b). Speed characteristics…
A: This question is from " ELECTRICAL MACHINE". Under which we are going to study about the performance…
Q: The armature of a 8 pole d.c. shunt motor has a lap connected armature winding with 1000 conductors…
A: Consider the given values, The No load flux is given as, ϕNL=10 mWb. Due to armature reaction, the…
Q: What are the differences in power factor, torque, speed, output power and efficiency of star…
A:
Q: Increasing of excitation current of separately excited DC generator at no-load state resuits in:…
A: When excitation current increases in a DC separately excited generator, it leads to increase in flux…
Q: Explain, using phasor diagrams, what happens to a synchronous motor as its field current is varied.
A:
Step by step
Solved in 2 steps with 2 images
- Objectives: To perform the speed control test on slip ring induction motor by rotor resistance control method. Plot the motor speed characteristics at different values of applied resistance in slip ring of induction motor. Can you explain what happened here? (image below)electrical machines (How does an asynchronous motor behave when there is a load?) explain by drawing an experiment connection diagram. the loaded experiment of induction motor (asynchronous motor) after that Briefly explain the loaded operating characteristic by drawing.1-) a) Does the slip increase as the load increases in an asynchronous motor? Explain what is the reason for this. b) What does it mean when the slip is 0, 1, -1 in asynchronous motor, how is it achieved? Explain.
- Draw and explain the operation of H-type with 4-switches per phase drivecircuit and the drive circuit for bifilar winding for stepper motor. In whichtypes of stepper motors these circuits are used?The armature, series field and shunt field resistances of 125 kW, 250 V long shunt cummulative compound DC generator are 0.025 ohms, 0.01 ohms and 30 ohms respectively. If stray power loss at rated load is 5 kW, determine the power in the armature fielda) Does the slip increase as the load increases in an asynchronous motor? What is the reason of this? b) What does it mean for Slip 0, 1, -1 in asynchronous motor, how is it achieved? Explain.
- Explain the supply voltage control method to control speed of three phase induction motor. Why this method is rarely used in practice? Draw the speed torque characteristic mentioning the effect of supply voltage on the speed. If you answer me within 20-30 minutes then I will give you the best feedback and definitely an upvote too5. Synchronous and Induction 3-Phase AC Motor a. [5\%] Explain the construction difference between a synchronous and an induction 3-phaseACmotor, in terms of field circuit and armature circuit?A three-phase 60 Hz induction motor connected to a three-phase bus at rated voltage isoperating at a low slip condition (i.e s < 20%) resulting in a steady state speed of 1090 rpm.(a) How many poles does the motor have?(b) What is the percentage slip at the operating speed?(c) What is the corresponding frequency, (fr) of the currents and voltages induced in therotor winding?
- Thanks in advance. Please answer this question by explaining the each step and reasoning why u used that method or formula. By the way, this question is related to electromechanical energy conversion lecture. The no-load and locked-rotor test results of a three-phase 10 HP, 220 V, 60 Hz, 6 poles star connected induction motor are; The no-load test: VNL=220 V, PNL=340 W, INL=6.2 A The locked-rotor test: VSC=54 V, PSC =430 W, ISC =15.2 A The voltage across the stator windings is 2 V when nominal DC current flows through it. Coefficient for DC resistance is 1,25. a) Calculate the equivalent circuit parameters and draw the complete single-phase equivalent circuit of the induction motor. b) Calculate efficiency of the motor for s=0.06 by using the approximate equivalent circuit (RFe core resistance is not ignored). c) Shaft torque for s=0,06 d) Slip value at the maximum (breakdown) torque, e) Maximum (breakdown) torque of the induction motor. f) Speed of the motor at maximum torque point.…A DC shunt generator has a full load output of 10kW at a terminal voltage of 240V. The armature and the shunt field winding resistances are 0.6 and 160 ohms respectively. The sum of the mechanical and core-losses is 500W. calculate the power required in kW at the driving shaft at full-load, and the corresponding efficiency and voltage regulationA three-phase, Y-connected, 220 V, 5 kVA, salient-pole synchronous generator is employed to supply power to a load with unitary fp. By means of a slip test, the direct-axis synchronous reactance is determined to be 12 Ω and the quadrature-axis synchronous reactance, 7 Ω. Consider that the rated current is delivered to the load at the rated voltage and that the armature resistance is negligible. (a) Calculate the corresponding value of the excitation voltage. (b) What is the value of the internal phase shift angle? (c) What is the value of the power angle?