Briefly describe the regenerative braking method of a DC motor. Where it is used?
Q: No-load speed of which of the ollowing DC motor will be highest? *
A: For DC motor Eb∝Nφ Eb is back emf N is speed φ magnetic flux For DC series motor at no load current…
Q: Indicate whether the following statement are true or false * True False Dc shunt motor is best…
A: In this question , we will see why shunt motors provide low starting torque.. Note:- I will answer…
Q: a separate excited dc generator turning at 1400r/min produces an induced voltage of 120v. The…
A: Given: DC generator speed, N = 1400 rpm Induced voltage, Ea = 120 V Armature resistance, Ra = 2 Ω…
Q: g) Explain the differences between shunt-winding and repulsion-start type universal motors.
A: According to the question we have to explain the differences between shunt-winding repulsion-start…
Q: Q.4 (a) Sketch the equivalent circuit for a shunt connected DC motor. TM equation of shunt connected…
A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…
Q: Question 1: Why did we perform the no-load operation experiment for the asynchronous motor? Question…
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Q: 1- What will happen if the armature current is turned on when a = 90°? 2- Why is series DC motor…
A: DC Drive The DC motor drive is a type of amplifier or power modulator that integrate between the…
Q: Explain with necessary Torque-Speed 'characteristics the operation of repulsion-start induction-run…
A: The repulsion motor depends on the principle of repulsion between two magnetic fields. Consider a…
Q: With the aid of suitable equivalent circuit of DC motor, briefly explain the purpose of braking…
A: You have asked multiple independent questions. We are authorized to answer one question at a time.…
Q: a Compare synchronous and induction motor in terms of: cost, starting methods, speed and torque. b…
A: a)
Q: Explain in detail the braking of Induction Motors
A: The three types of breaking of induction motor are, 1. Regenerative 2. Plugging Braking 3. Dynamic…
Q: In what real-life situations, do we need DC motors to run forward or reverse?
A: Dc motors are known for their easy forward reverse operation which can be achieved easily with the…
Q: Explain the effect of increasing the armature voltage on the behavior of the shunt wound machine…
A:
Q: If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will…
A: Need to find true false
Q: Explain why a resistor is needed in series with the armature when starting a DC motor, but is not…
A: Starting current of DC motor 5 to 7 times of full load current. To avoid windings damage from this…
Q: Briefly describe the regenerative braking method of a DC motor. Where it is used? For the toolbar,…
A: The detailed answer is solved below according to the given parameters and instructions in the…
Q: 2- Why is series DC motor used for accelerating heavy masses?
A: Need to find why DC series motor is used for accelerating heavy loads
Q: Discuss what the different between 'Regenerative' and 'Plugging' of braking mode control in…
A:
Q: Consider a shunt-connected dc motor. What are the names of the two windings? Which is on the stator?…
A: There are two windings in DC motors; Field winding which is used to setting up the magnetic field…
Q: If a synchronous machine is used as a motor. Which voltage is higher? The phase or the induced…
A:
Q: Explain why reduced current is important during the motor acceleration
A: Reduced current is important during motor acceleration because the current is very during starting…
Q: (b) Differentiate the terms of 'Dynamic Braking’ and Plugging' in DC Motor drives when it is in…
A: The solution is given below
Q: Explain the methods of starting asynchronous motors and drawing Star / Delta starting, also explain…
A: The AC motor are classified on the basis of their speed of rotation. The AC motors can be…
Q: Which dc motor is used in fan?
A: In the fans, DC and AC, both motors are used depending on their use. In AC fans, mainly single-phase…
Q: "In plugging type of braking system of DC motor, the current in the series and shunt fields must not…
A: when motor is running in one direction, when we want to stop the motor we apply braking tachniques.…
Q: 2. Explain the effect of increasing the armature voltage on the behavior of the series wound machine…
A:
Q: electrical machines (How does an asynchronous motor behave when there is a load?) explain by…
A: Answer
Q: A 460V, 1250rpm, 30hp DC shunt motor, operating at rated conditions is to be dynamically braked by…
A: In this question, We need to draw the complete schematic of the motor in the braking.
Q: Speed control of induction motor explain full theory fast
A:
Q: 3- What is the function of a commutator in the DC motor?
A: DC motor converts electrical energy into mechanical energy.
Q: For what purpose is the short circuit test performed in asynchronous motor? Please explain.
A: Need to explain about short circuit test in asynchronous motor
Q: Briefly describe the regenerative braking method of a DC motor. Where it is used
A:
Q: What types of motors contain brushes and a commutator? What is the function of these parts?
A: The kind of motor which contains brushes and commutator are DC motors.
Q: A 460V, 1250rpm, 30hp DC shunt motor, operating at rated conditions is to be dynamically braked by…
A: ''Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
Q: in a DC motor why and how the gain K is affected by the amaurtue resistant and induance ? whats the…
A: For DC motor the emf equation is given as:
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: 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: (B) Explain briefly the following Why the armature is connected as LAP winding with high torque low…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…
Q: idle running test of asynchronous motor Locked rotor test of asynchronous motor Briefly describe…
A: The asynchronous motor also knows as Induction motors. In order to determine induction motor…
Q: Explain how we can use the frequency for speed control of the asynchronous motor. And describe the…
A: consider the given question;
Q: Find the percent speed regulation for 4 pole, 240 Volts, 24 hp shunt motor having the following…
A:
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: Explain with diagrams the operation of single stack variable reluctance stepper motor. Is it…
A: To Explain with diagrams the operation of single stack variable reluctance stepper motor.
Q: While operating at full load in all features, the synchronous motor changes characteristics when the…
A: While operating at full load in all features, the synchronous motor changes characteristics when the…
Q: Why it is not possible to start dc series motor without load?
A: In dc series motor motor, armature current is decided by the load. On light load or no load, the…
Q: a) If the torque pulled from the shaft is doubled while the asynchronous motor is working in the…
A: As per our policy, i have to attain only one question. Solution a)- In the asynchronous motor's…
Q: Q1) Why is a starting resistor used in DC motor circuits?. Explain in detail.
A: As per Bartleby guidelines we are allowed to solve only three subparts, please ask the rest again.
Q: 28/ How can the speed of a shunt dc motor be ontrolled? Explain in detail.
A:
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- A 6-phase ∆-connected 1600 V (line-to-line), 150 kW, 50 Hz, six-pole induction driveis used in an electric car. The drive has the following parameter values in Ω/phasereferred to the stator:R1 =0.334 Ω R2 =0.168 Ω Rm1 = 125 ΩX1 = 0.273 Ω X2 = 0.287 Ω Xm1 = 16.78 ΩThe total friction, windage, and core losses may be assumed to be constant at Prot =773 W, independent of load. For a slip value of s=0.015: b ) Compute the speed, output torque, power and stator current d) Calculate the efficiency when the motor is operated at rated voltage andfrequency. answer:b) n= 985 rpm; Torque T= 1.18 x104 Nm; Power= 1.22 x106 W; Stator current I = 175.72 /32.79° (d) Efficiency = 86.4%The current drawn by 230V, 60Hz, 4-pole, star-connected 3-phase induction motor at full load is 15∠0°A. The equivalent circuit parameters of the motor are as follows. R₁=5Ω , R2=3 Ω, X1=0, X2=0, Xm=∞, RFE=15 Ω. friction loss = 4W. Since the slip is 2.5%, find the efficiency and motor torque.Measured in the idle test of a three-phase star-connected induction motordata: 300 V / 2.2A / 145 W. In the short circuit test, 60 V / 25 A /680 W data measured. L type equivalent circuit for case where slip is 3%Find the current ( I2) flowing through the load resistor that varies due to shear.and obtain the electrical equivalent circuit of the motor in this state. Whole circuitto obtain the values of the elements properly andDraw the L-type electrical equivalent circuit by writing on the elementsMake your calculations and drawings legible. You find
- 380 V, 50 Hz, 2p = 6, star connected induction motor impedance in ohms per phase values:R1 = 0.3, X1 = j0.45, R2 = 0.15, X2 = j0.45, Xm = j15Its total mechanical losses are 500W. Core losses are negligible. For a rotor slip of 0.01 at rated voltage, calculate the following:1-rotor speed2-Input active power3-Stator copper losses4-air gap power5-Transferred power and Output power6-shaft moment7-efficiencyA 12-phase ∆-connected 3200 V (line-to-line), 12,000 kW, 50 Hz, twelve-pole squirrel-cage induction drive is designed for electric vehicle use. The drive has the following equivalent parameter values in Ω/phase referred to the stator: R1= 0.697 Ω R2= 0.328 Ω Rm1 = 226 Ω X1 = 0.549 Ω X2 = 0.456 Ω Xm1 = 31.573 Ω The total friction, windage, and core losses are assumed to be constant at Plosses=1156 W, independent of load.a)Draw the equivalent circuit for this drive and show the relevant parameters on the circuit.For a slip value of s = 0.032 and using the above equivalent circuit parameters, determine: b) The stator current and the power factorc) The synchronous speed and the rotor speed for this drived) The torque generatede) The input power for this operating conditionf) The efficiency when operated at rated voltage and frequencyg) Considering the design of this motor, state if it is possible to start this drive with a slip ring starter. Give reasons to justify your answerM:47) A constant speed drive has the following duty cycle: - Load rising from 0 to 500 KW , 4 min. - Uniform load of 400 KW , 4min. - Regenerative power of 500 KW returned to the supply, 5 min. - Remains idle for 1 min. Estimate power rating of the motor. Assume losses to be proportional to (power)2.
- Electromechanical energy conversion Measured in the idle running test of a three-phase star-connected asynchronous motor data: 300 V / 2.2A / 145 W. In the short circuit experiment, 60 V / 25 A / 680 W data was measured. L type equivalent circuit for the case where the slip is 3% Find the current (I'2) passing through the load resistance that changes due to slippage. and obtain the electrical equivalent circuit of the motor in this case. By obtaining the values of all circuit elements properly and overwriting the circuit elements, L type electrical Draw the equivalent circuit. Your calculations and drawingsA 12-phase ∆-connected 3200 V (line-to-line), 12,000 kW, 50 Hz, twelve-polesquirrel-cage induction drive is designed for electric vehicle use. The drive has thefollowing equivalent parameter values in Ω/phase referred to the stator:R1= 0.697 Ω R2= 0.328 Ω Rm1 = 226 ΩX1 = 0.549 Ω X2 = 0.456 Ω Xm1 = 31.573 ΩThe total friction, windage, and core losses are assumed to be constant at Plosses=1156 W, independent of load.a)Draw the equivalent circuit for this drive and show the relevant parameters onthe circuit.For a slip value of s = 0.032 and using the above equivalent circuit parameters,determine: b) The stator current and the power factor c) The synchronous speed and the rotor speed for this drive d) The torque generatede) The input power for this operating conditionf) The efficiency when operated at rated voltage and frequencyg) Considering the design of this motor, state if it is possible to start this drive witha slip ring starter. Give reasons to justify your answer. just need answer…A 12-phase ∆-connected 3200 V (line-to-line), 12,000 kW, 50 Hz, twelve-polesquirrel-cage induction drive is designed for electric vehicle use. The drive has thefollowing equivalent parameter values in Ω/phase referred to the stator:R1= 0.697 Ω R2= 0.328 Ω Rm1 = 226 ΩX1 = 0.549 Ω X2 = 0.456 Ω Xm1 = 31.573 ΩThe total friction, windage, and core losses are assumed to be constant at Plosses=1156 W, independent of load.a)Draw the equivalent circuit for this drive and show the relevant parameters onthe circuit.For a slip value of s = 0.032 and using the above equivalent circuit parameters,determine:b) The stator current and the power factorc) The synchronous speed and the rotor speed for this drived) The torque generatede) The input power for this operating conditionf) The efficiency when operated at rated voltage and frequencyg) Considering the design of this motor, state if it is possible to start this drive witha slip ring starter. Give reasons to justify your answer
- A 50 HP, 97% efficient, three-phase Wye-connected synchronous motor is connected to a480 VAC, 60 Hz power supply. The field excitation is set such that the power factor is 0.97leading. The per-phase stator reactance is 90% Hello, I want to Find the internally generated voltage, Ea. and Calculate the motor torque angle, δ. I think I am not using the correct method of equations. Thank you for your time and help.405 / 5000 Find the slip, the powers converted,air gap, output and efficiency of a motorthree-phase induction in Y of 138.56 V of voltage ofphase, 60 Hz and 50 hp, which is supplied with 35 A at apower factor of 0.85 lagging. The losses are: copper stator, 2.5 kW rotor, 750 W friction and friction, 650 W and from the core, 1850 W, Negligible miscellaneous losses.Q#5 a) What is electric traction system, explain its major components. b) What are the Merits and Advantages of electric traction? c) What is phase sequence and its importance?