Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 37, Problem 3SQ
To determine
Choose the correct option that could cause the problem as follows: When the motor is running in second speed. All of a sudden, it accelerates to the fourth speed.
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A 4–pole, 500 V d.c. shunt motor has 720 wave–connected conductors on its armature. The full–load armature current is 60 A and the flux per pole 0.03 Wb. The armature resistacne is 1.2 Ω. What is the full–load speed of the motor?
H.W 1)
A 4-pole, 500 V d.c. shunt motor has 720 wave-connected conductors on its
armature. The full-load armature current is 60 A and the flux per pole 0.03 Wb.
The armature resistacne is 1.2 Q and the contact drop is 1 V per brush.
Calculate the full-load speed of the motor.
H.W 2)
A d.c. series motor with series field, and armature resistance of 0.06 ohm and 0.04
ohm respectively is connected across 220 V mains. The armature takes 40 A, and
its speed is 900 rpm. Determine its speed when the armature takes 75 A, and
excitation is increased by 15% due to saturation.
I need that quesitons answer also rpm is 1000 and the rate is %10 on red texting
Chapter 37 Solutions
Electric Motor Control
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- 6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.arrow_forward4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.arrow_forwardPlease answer all subparts please answer in typing formatarrow_forward
- A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?arrow_forward1. Explain the working Principle of Single Phase Induction Motor. 2. What are the different types of Starters to control AC-Motor. Explain briefly. 3. Explain DOL starter of Single Phase Induction Motor briefly. 4. What is the purpose of the magnetic contactor? 5. What is the use of auxiliary contact in the magnetic controller? 6. What happens when the holding coil gets the supply in the magnetic controller? 7. Explain the working principle of a relay.arrow_forwardFinal 1A DC shunt motor is rated 10HP, 250V and is connected to 235V source. The armature resistance is 0.2 ohm, the field circuit resistance is 125 ohm and the total rotational losses are 380W. The motor is driving a load, and it draws an armature current of 30A, Calculate the output power. b) 41 d) 6490 6870 7492 7460 Boş birakarrow_forward
- A three-phase, six-pole, 60 Hz, 230-volt wound rotor motor has its stator connected in delta and its rotor in star. There are 70 percent as many rotor conductors as stator conductors as stator conductors. Calculate the voltage and frequency between slip rings if normal voltage is applied to the stator when, a, the rotor is at rest, b. the rotor slip is 0.04arrow_forward8) No handwritten, only typing...arrow_forwardWhat is the answer for Question 13?arrow_forward
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