Homework Answers
Add Answer to:
A separately excited de motor turns at 1200 r/min when the armature is connected to a...
A 250V, 50A separately excited DC motor has armature resistance of 0.8 ohms (including brushes) and...
A 250V, 50A separately excited DC motor has armature resistance of 0.8 ohms (including brushes) and field resistance of 100 ohms. Kf for this motor is 1.5 V/(A.rad/sec). The armature circuit can carry up to 50A for a short time period. It is desired to run it with a 250 V voltage source in no load conditions with the speed of 1500 r/min. a) Explain the required equipment and steps. b) Draw the circuit for steady-state operation with the speed...
Problem 2 A separately excited DC motor is characterized by the followng intormation Armature res...
Problem 2 A separately excited DC motor is characterized by the followng intormation Armature resistance Ra-5 2 armature inductance La . very large, Field resistance RS200 Ω, ted voltage Vt 200 V, and an inertia constant J-12 kg m Neglecting friction losses and assuming no-saturation in the machine magnetic core system, answer the folowing questions: Part 1: (6 marks) he motor a as shown in figure 2a. The motor drives a constant power load of vaue 1 40375 hp (ie...
Given a 1/4 hp, separately excited, dc motor with the following parameters: K = 0.61, R, 15Ω, La-...
I can not seem to get the right answers. Thank you!
Given a 1/4 hp, separately excited, dc motor with the following parameters: K = 0.61, R, 15Ω, La-120mb. J = 0.005, and b = 0.0006. The armature voltage is controlled by a 120-V dc PWM source operating at 100 Hz 1. What is the armature current if the no-load speed is 1800 rpm when the armature supply is operated at a 100% duty cycle? 2. What is the no-load...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de supply The ac generator is connected to a 460 V, fixed-voltage, fixed-frequency, three-phase supply. The synchronous reactance of the synchronous generator is 513 Ω/phase. The armature resistance of the de motor is 30 m2. The 4-pole de machine is rated 30 kW at 230 V. All unspecified losses are to be...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve as shown in Figure 1. The armature resistance is 0.189 and the field resistance is 2002 with and adjustable field resistance of 0 to 4002. The shunt de motor has rated line current of 50A when supplying rated voltage. (a) Determine the value of the adjustable field resistance so that the motor operates at no- load speed of 1200 r/min. [5 marks] (b) Assuming...
A 230 V, 1000 rpm, 30 A separately excited motor has armature resistance and inductance of...
A 230 V, 1000 rpm, 30 A separately excited motor has armature resistance and inductance of 0.7 Ω and 50 mH respectively. Motor is controlled in regenerative braking by a chopper operating at 800 Hz from a dc source of 230 V. Assuming continuous conduction a) Calculate duty ratio of chopper for rated torque and the speed of 800 rpm. b) What will be the motor speed for duty ratio of 0.6 and rated motor torque? c) What will be...
A separately-excited DC traction motor of a metro train is in series connection, i.e., the armature...
A separately-excited DC traction motor of a metro train is in series connection, i.e., the armature and the field windings are connected in series with a common DC power source. The voltage of the DC power source is I (a) Please show that the angular velocity of the rotor is KT K where o is the is the angular velocity of the rotor, Ra is the resistance of the armature, Rris the resistance of the field windings, T is the...
In a separately excited DC motor, the field voltage is much bigger than the armature input...
In a separately excited DC motor, the field voltage is much bigger than the armature input voltage. What is the problem in which the motor can be?
A 225 kW ( 300 hp), 250 V, 1280 r/min de motor has windage, friction, and...
A 225 kW ( 300 hp), 250 V, 1280 r/min de motor has windage, friction, and iron losses of 8 kW. It drives a large flywheel and the total moment of inertia of the flywheel and armature is 177 kg.m2. The motor is connected to a 210 V dc source, and its speed is 1280 r/min just before the armature is switched across a braking resistor of 0.2 Q Calculate The mechanical time constant Toof the braking system The time...
A 100 kW, 500 V, 2000 r.p.m separately excited d.c. motor is energized from a 400...
A 100 kW, 500 V, 2000 r.p.m separately excited d.c. motor is energized from a 400 V, 50 Hz, three phase source through a three phase full converter. The voltage drop in conducting thyristors is 2 V. The d.c. motor armature resistance is 0.1 Ω, motor constant is 1.6 V-s/rad, rated armature current is 210 A and no-load armature current is 10% of rated current. Determine the following: i) Motor terminal voltage at a firing angle of 30 ii) No...
Problem 2 A separately excited DC motor is characterized by the followng intormation Armature resistance Ra-5 2 armature inductance La . very large, Field resistance RS200 Ω, ted voltage Vt 200 V, and an inertia constant J-12 kg m Neglecting friction losses and assuming no-saturation in the machine magnetic core system, answer the folowing questions: Part 1: (6 marks) he motor a as shown in figure 2a. The motor drives a constant power load of vaue 1 40375 hp (ie...
I can not seem to get the right answers. Thank you!
Given a 1/4 hp, separately excited, dc motor with the following parameters: K = 0.61, R, 15Ω, La-120mb. J = 0.005, and b = 0.0006. The armature voltage is controlled by a 120-V dc PWM source operating at 100 Hz 1. What is the armature current if the no-load speed is 1800 rpm when the armature supply is operated at a 100% duty cycle? 2. What is the no-load...
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de supply The ac generator is connected to a 460 V, fixed-voltage, fixed-frequency, three-phase supply. The synchronous reactance of the synchronous generator is 513 Ω/phase. The armature resistance of the de motor is 30 m2. The 4-pole de machine is rated 30 kW at 230 V. All unspecified losses are to be...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve as shown in Figure 1. The armature resistance is 0.189 and the field resistance is 2002 with and adjustable field resistance of 0 to 4002. The shunt de motor has rated line current of 50A when supplying rated voltage. (a) Determine the value of the adjustable field resistance so that the motor operates at no- load speed of 1200 r/min. [5 marks] (b) Assuming...
A separately-excited DC traction motor of a metro train is in series connection, i.e., the armature and the field windings are connected in series with a common DC power source. The voltage of the DC power source is I (a) Please show that the angular velocity of the rotor is KT K where o is the is the angular velocity of the rotor, Ra is the resistance of the armature, Rris the resistance of the field windings, T is the...
A 225 kW ( 300 hp), 250 V, 1280 r/min de motor has windage, friction, and iron losses of 8 kW. It drives a large flywheel and the total moment of inertia of the flywheel and armature is 177 kg.m2. The motor is connected to a 210 V dc source, and its speed is 1280 r/min just before the armature is switched across a braking resistor of 0.2 Q Calculate The mechanical time constant Toof the braking system The time...
Most questions answered within 3 hours.
-
91. If the half – life of a sample of radioactive
material is 60 days, what...
asked 50 seconds ago -
White light (380nm-750nm) strikes a diffraction grating (420
lines/mm) at normal incidence. What is the highest-order...
asked 10 minutes ago -
1) Explain what is meant by a good being "excludable."?
2) Explain what is meant by...
asked 9 minutes ago -
I need help with this question:
Describe in detail at least two factors that stimulated American...
asked 17 minutes ago -
Calculate the Boyle temperature for helium assuming it follows
the Berthelot equation of state.
asked 17 minutes ago -
Summarize Strategic Corporate Social Responsibility, 4th edition
2017 book, chapter one and two.
asked 17 minutes ago -
1. If the standard deviations for return on stock A and stock B
are 28% and...
asked 32 minutes ago -
Please use python to explain.
Assume that the variables x and
y refer to strings. Write...
asked 39 minutes ago -
This table shows the US domestic demand and supply schedules
for oranges. Suppose the world price...
asked 39 minutes ago -
Please help me create a CLASS DIAGRAM for this code:
import pygame
from pygame.sprite import Sprite...
asked 40 minutes ago -
The Merriweather Printing Company is trying to decide on the
merits of constructing a new publishing...
asked 1 hour ago -
29) Insulin is a water-soluble hormone transported in the blood.
Which describes a likely way in...
asked 1 hour ago