Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 2.3, Problem 19RQ
To determine
To state:
The relationship between the speed and the number of poles per phase of a three-phase induction motor.
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Students have asked these similar questions
A 480V, 3-phase, 50Hz 6-pole Induction motor with a rated power of 10KVA.
(i) Calculate the synchronous speed in rad/sec (ws)
(ii) Determine the rotor speed in rpm, if the % slip is 2.5%
QUESTION 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…
The reason why the starting torque of a series motor is higher than a shunt motor is
because the series motor has
O more current flowing through its armature
O a stronger net magnetic field around both coils during the inrush of stator current
Chapter 2 Solutions
Electric Motors and Control Systems
Ch. 2.1 - Define the term motorcontrol circuit.Ch. 2.1 - Why are symbols used to represent components...Ch. 2.1 - An electrical circuit contains three pilot lights....Ch. 2.1 - Describe the basic structure of an electrical...Ch. 2.1 - Prob. 5RQCh. 2.1 - The contacts of a pushbutton switch open when...Ch. 2.1 - A relay coil labeled TR contains three...Ch. 2.1 - A rung on a ladder diagram requires that two...Ch. 2.1 - Prob. 9RQCh. 2.1 - The wire identification labels on several wires of...
Ch. 2.1 - A broken line representing a mechanical functionon...Ch. 2.2 - What is the main purpose of a wiring diagram?Ch. 2.2 - In addition to numbers, what other method can...Ch. 2.2 - Prob. 3RQCh. 2.2 - Prob. 4RQCh. 2.2 - Prob. 5RQCh. 2.2 - What is the main purpose of a single-line diagram?Ch. 2.2 - Prob. 7RQCh. 2.2 - Prob. 8RQCh. 2.3 - Prob. 1RQCh. 2.3 - Prob. 2RQCh. 2.3 - Prob. 3RQCh. 2.3 - Prob. 4RQCh. 2.3 - Prob. 5RQCh. 2.3 - Prob. 6RQCh. 2.3 - In what phase configurations are AC induction...Ch. 2.3 - Prob. 8RQCh. 2.3 - Prob. 9RQCh. 2.3 - Prob. 10RQCh. 2.3 - Prob. 11RQCh. 2.3 - Prob. 12RQCh. 2.3 - Prob. 13RQCh. 2.3 - Prob. 14RQCh. 2.3 - Prob. 15RQCh. 2.3 - Prob. 16RQCh. 2.3 - Prob. 17RQCh. 2.3 - Prob. 18RQCh. 2.3 - Prob. 19RQCh. 2.3 - Prob. 20RQCh. 2.3 - Prob. 21RQCh. 2.3 - Prob. 22RQCh. 2.4 - Interpret what each of the following pieces of...Ch. 2.4 - List three applications where a motor service...Ch. 2.4 - Prob. 3RQCh. 2.4 - Prob. 4RQCh. 2.4 - Prob. 5RQCh. 2.4 - Prob. 6RQCh. 2.4 - Prob. 7RQCh. 2.4 - Prob. 8RQCh. 2.5 - How are the contacts of a manual motor...Ch. 2.5 - Prob. 2RQCh. 2.5 - Prob. 3RQCh. 2.5 - Prob. 4RQCh. 2.5 - Prob. 1TCh. 2.5 - Prob. 2TCh. 2.5 - Prob. 4TCh. 2.5 - Prob. 5TCh. 2.5 - Prob. 6TCh. 2.5 - Prob. 1DTCh. 2.5 - Prob. 2DTCh. 2.5 - Search thelnternet forelectric motor...Ch. 2.5 - Prob. 4DTCh. 2.5 - Prob. 5DT
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Similar questions
- Name three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forwardName three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.arrow_forwardA 75-hp, three-phase squirrel-cage induction motor is connected to 480 volts. The motor has a NEMA code D. What is the starting current for this motor?arrow_forward
- A three phase induction motor operates with a rotor speed of 1440 rpm and develops a torque of 66.32NM at full load. The full load power output is * O 10 kw O 9 kw O 8 kW O 11 kWarrow_forwardA 20-hp, three-phase squirrel-cage induction motor has a NEMA code E. The motor is connected to 208 volts. What is the starting current for this motor?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forward
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