4-18- A 15-hp, 220-V, three-phase, 60-Hz, 6-pole, Y-connected induction motor has the following parameters per phase: ri = 0.128 Q ŕ2 = 0.0935 Q Xi + X'2= 0.496 Q re = 183 2 X, =8 N %3D the rotational losses are equal to the stator hysteresis and eddy- current losses For a slip of 3%, find: (a) The line current and power factor. (b) The horsepower output (c) The starting torque.
Q: Problem 1. A DC motor has the following characteristic curve. What is the Motor Stall Torque:
A: Motor stall torque is the torque at the maximum load that is the angular velocity is zero. There…
Q: An assembly plant uses a hoist to raise and maneuver large objects. The hoist shown in Figure is a…
A:
Q: Q1/ B/ A shunt DC generator delivers 450A at 230V, and the resistances of the shunt and armature…
A: Draw the circuit of the shunt D generator. Write the expression of current in the field.…
Q: A 3-phase I.M. operate at 400 Hz has a rated speed 10800 R.P.M, its speed at slip = 0.7 is equal to:…
A: Last option is correct. Correct ans is 3240 RPM
Q: The nameplate data of a separately excited DC motor is PN=5.5kW, UN=110V, In=80A, n=1000r/min. Try…
A: Mechanical characteristic is another name for speed-torque characteristic. For smaller loads, speed…
Q: (27) A motor weighing 200 Ib is running at a constant speed of 1800 rpm. If the transmissibility of…
A: Given:m=200 lb =90.7185 KgN=1800 rpmε=0.1
Q: Example 34.2. The stator of a 3-0 induction motor has 3 slots per pole per phase. If supply…
A: Given, n=3 slots/pole/phasef=50 Hz
Q: A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill…
A:
Q: Problem Solving. Solve the following problems completely. 5. Motors from two different manufacturers…
A:
Q: 4. For a critically damping system, the motion will be harmonic. A. True B. false 5. The damping…
A: 4) False 5) True
Q: 3. An 8-pole alternator runs at 750. r.p.m. and supplies power to a 6-pole induction motor which has…
A: Given:Ps=8Ns=750 rpmP=6Sfl=3%
Q: A 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging and…
A:
Q: A shunt motor draws current of 60 A from a 120V source rotating at 1800 RPM. If the armature…
A:
Q: A single phase motor of 210 V, its circuit shown below, calculate motor slip, forward torque and…
A:
Q: 1. A spring has a characteristic of k = 2.75N/m. It has an original length of 0.100 m. What is its…
A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: A compound dynamo supplies a load of 20 kW at 400 V through a feeder having a resistance equal to…
A:
Q: A 4-pole shunt generator with wave-wound armature has 41 slots, each having 12 conductors. The…
A: Write the given data: P=4A=2for wave woundZ=4112=492Ra=0.05 ohmRsh=200 ohmRL=10 ohmϕ=25 mWb=0.025…
Q: A balanced star-connected load of (8 + j6) Q per phase is connected to a Balanced 3- phase 400-V…
A: Diagram of the given problem
Q: 5. The maximum load current that can be drawn is 15 kn V, = 9V R,=0 A 30 V RL a) 1.4 mA b) 2.3 mA c)…
A: Given data: The two voltages across two terminals are V1=9 V and V2=30 V The resistance is R=15 kΩ
Q: Q5.A 50 HZ, 4-poles star connected induction motor has a slip=0.04 & Pout=20hp find: (1).Synchronous…
A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…
Q: In a given DC motor, the output power is 20 HP, and the copper losses are 1.1 KW. If the motor is…
A:
Q: 30,000 kW at power factor 0-8 lagging is being transmitted over a 220 kV, three-phase transmission…
A: Given data: Powers is P = 30 MW = 30 x 106 WPower factor f = 0.8Transmission voltage is V = 220 kV =…
Q: FOS using max. Distortion energy theory?
A: Given; A shaft is subjected to pure torsional moment.Maximum shear stress,σmax=100 MPaYield…
Q: B-increase of spring coefficient like 0.5 k, 2k, 5k and / or how does the natural frequency of the…
A:
Q: A six-pole lap wound armature rotating at 350 rpm is required to generate 260 V. The effective flux…
A:
Q: What is the purpose of the Tip Mass in the model of the Magnetostrictive vibration energy harvester?
A: The process of converting vibrational energy to electrical energy using Magnetostrictive materials…
Q: Example 7-3. A460-V, 25-hp, 60-Hz, four-pole, Y-connected induction motor has the following…
A: Note : As per the rules we can answer only 3 sub-parts, please post the remaining sub-parts as the…
Q: "In the Hook's law experiment and according to the relation 7 = 4T" -M, this means that the used…
A:
Q: If a DC motor with 83% efficiency requires a current supply of 213 mA at 250 rpm. What should be the…
A: Given: η = 83%I = 213 *10-3 APin=1.5 WN = 250 rpm
Q: A load is mounted on a spring with a spring constant of 324 Nm -1 and confined to move only…
A:
Q: Among the following, which one is not the example of rotating masses. O Winch motor O crank shaft O…
A: Winch motor : A winch motor is the component of the winch that actually powers the cable, rope or…
Q: QUESTION NO 1: For an overhead crane as shown in the figure below, the trolley weighs 20 times the…
A:
Q: Q1. Long-shunt generator delivers a load current of 30 A at 220 V. It has armature and shunt field…
A: Question (1) is Solved here. For Other Question, Please Post this Question again.
Q: The maximum distance for device has spring are 60mm, 58mm, 48.4mm, 80 mm ? M= 40kg, K=800 N/m Find :…
A: Given that, M=40 kg,k=800 N/m, Calculate natural frequency, ωn=kMωn=80040ωn=4.472 rad/sec,
Q: As shown in the figure below, this is a speed regulation method for DC separately excited motor. a)…
A: Speed regulation methods are used to control the speed of the motor. Depending upon the type of…
Q: What is the frequency (in Hz) of a motor spinning at 1740 rpm?
A:
Q: A 240 V, 60 Hz, Delta connected, 870 r.p.m., Eight poles, Three-Phase Induction Motor has the…
A: we can only answer 3 subparts but as your question is not lengthy we are answering max 8 parts.
Q: The maximum distance for device has spring are 60mm, 58mm, 48.4mm, 80 mm ? M= 40kg, K=800 N/m Find :…
A:
Q: A). At full load of 15 h.p. of totally-enclosed fan cooled type motor has a temperature rise of…
A: Given Data The load is 15 hp The temperature rise after half hour is 25°C The temperature rise…
Q: 5- A pulley 250 mm in diameter drives a second pulley 1,000 mm in diameter by means of a belt as in…
A: Given data: The diameter of the small pulley is d = 250 mm. The diameter of the large pulley is Dd…
Q: Can someone explain to me the solution of this problem please and why VB=(-20i) rad/s? Why…
A:
Q: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and…
A:
Q: A refrigerator unit having mass of 35 kg is to be supported on three springs, each having a spring…
A:
Q: A 240 V D.C shunt motor has an armature resistance of 0.2 2. When the armature urrent is 40 A, the…
A:
Q: natural frequencies of torsional vibration of the generator shaft and the amplitude ratio between…
A: Given: Gear ratio=8:1 TO determine: Natural frequency Amplitude ratio between turbine and generator…
Q: 1. A moving coil voltmeter with a resistance of 150 ohms gives a full scale deflection with a…
A: Electric current measurements are made with a moving coil galvanometer. It is a sensitive…
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
- QUESTION 1 Consider the equations of motion of an armature controlled DC motor given by Jw(t)+bw (t) Ki (t) = di (l) L + Ri (t) + Kw (t) = -Tfriction - Tload (t) Vin (t), dt where vin(t) is the input voltage and Tload(t) is the input load torque. The outputs are the armature current i(t) and the motor speed w(t). When the input voltage and torque are constant, the transient response of this system has the form of the homogeneous solution. What is the time constant of the transient response? Find the characteristic roots of this system first. Keep 3 significant figures, and do not include units. Use scientific notation. The constants are given below: Nominal voltage, Vin(t) = 17 V Moment of inertia of the rotor, J = 0.02 kg-m² Motor viscous friction constant, b = 0.009 N-m-s Friction torque, Tfric = 0.003 N-m Armature inductance, L = 0.1 H Armature resistance, R = 0.35 Back emf constant and motor torque constant, K = 0.21 N-m/A. **Recall that the time constant (or relaxation time) is…The nameplate data of a separately excited DC motor is PN=5.5kW, UN=110V, In=80A, n=1000r/min. Try to plot its inherent mechanical properties of this motor.A 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging andthe efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and powerfactor raised to 0·95 lagging. Each of the capacitance units is built of five similar 600-V capacitors.Determine the capacitance of each capacitor.
- If wo = 106 rad/s, Q, = 5 × 10² and m = 10-1ºkg, calculate the stiffness, and resistive constant (b) of the system. S For a driven damped oscillator, show that the energy dissipated per cycle by a frictional force Fa = bv at an angular frequency (@) is given by: E = nbwA².A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWbQUESTION 8 Consider the equations of motion of an armature controlled DC motor given by Jw(t)+bw (t) Ki(t) = -Tfriction - Tload (t) di (t) + Ri (t) + Kw (t) = Vin (t), dt where vin(t) is the input voltage and Tload(t) is the input load torque. The outputs are the armature current i(t) and the motor speed w(t). The steady-state response of motors are specified by nominal voltage, stall torque, stall current, no load speed, and no load current. At steady-state operation, the motor equations satisfy bo) -Ki =-T -T. fric load Ri +Kov_- 55 55 The stall torque is the load torque required stead-state speed of the motor is zero. The stall current is the armature current when the motor speed is zero. The no load speed is the speed of motor when the load torque is zero. The no load current is the current when the load torque is zero. What is stall torque for this motor in N-m? Keep 3 significant figures, and do not include units. Use Scientific notation. The constants are given below. Nominal…
- Q3) A 220 V d.c series motor has armature and field resistances of 0.15 Q and 0.10 Q respectively. It takes a current of 30 A from the supply while running at 1000 rpm. If an external resistance of 1 Q is inserted in series with the motor, calculate the new steady state armature current and the speed. Assume the load torque remains constant.Parameter Value Unit Remarks Inertia 36 tonne m? Damping 20 N-m.s Train mechanisms only Load Torque 117.720 kN-m A train has the effective total properties in the preceding table. It is desired to be able to completely stop the train from full speed in 15 seconds, while maintaining rated supply to the field. 1. Find the number of DC motors needed to run and decelerate the train without any motor being subjected to more than its rated capabilities. Assume uniform load distribution; identical machine models, terminal voltages, and controls. 2. Derive an expression for the armature current la(t) in each machine. 3. Derive an expression for the instantaneous terminal voltage Va(t) required for the controllers. 4. Due to practical limitations, it is often necessary to stop regenerative braking once one of the following occurs: zero-speed, zero Va(t), or zero la(t). Determine the angular speed (in rpm) at which this occurs.5- A pulley 250 mm in diameter drives a second pulley 1,000 mm in diameter by means of a belt as in Figure 3. The moment of inertia of the driven pulley is equal to 0.2 kg- m2. The belt connecting these pulleys is represented by two springs, each of stiffness JF k. For what value of k will the natural frequency be 6 Hz? of 0.2 CO000 100 mm (h) Figure 3
- M=2kg m=2kg w=4 e=2 omega=4t please solve with angular motionProblem 1 3-Phase AC Machinery Principles Part 1: Complete the following table by calculating the speed of magnetic field rotation in AC machines depending on the number of poles and the operating frequency. Number of Speed (RPM) Poles Frequency f = 50 Hz Frequency f= 60 Hz 4 6. 10 SolutionQ5.A 50 HZ, 4-poles star connected induction motor has a slip=0.04 & Pout=20hp find: (1).Synchronous speed in r.p.m.(ns) 2)rotor speed in r.p.m(n;) 3). Rotor frequency (f:). 4Loud torque, 5) Rotor frequency Note: 1hp=746watt