Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 55, Problem 1SQ
Textbook Problem

What is the operating principle of all three-phase motors?

To determine

Explain the operating principle for all three-phase motors.

Explanation of Solution


The three-phase AC motors work on the principle of rotating magnetic field (RMF). When the three-phase supply is connected to stator of the motor, the three-phase currents induce the three flux waves. The fluxes interact with each other and produce the RMF. The speed of the RMF is a synchronous speed.

The synchronous speed of RMF depends on the number of poles per phase and the applied voltage’s frequency. The electromotive force (EMF) is induced in the rotor conductors due to the RMF. The induced EMF on the rotor leads to the flow of current in the rotor conductors, and subsequently rotor torque is produced. The rotor rotates in the direction of RMF due to the rotor torque.


Thus, the operating principle of all three-phase motors is explained.

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Engineering Textbook Solutions

Find more solutions based on key concepts
Show solutions add
Describe the Big Data phenomenon.

Database Systems: Design, Implementation, & Management

Which security protocols are predominantly used in Web-based e-commerce?

Principles of Information Security (MindTap Course List)

What is cast iron?

Precision Machining Technology (MindTap Course List)

What are data warehousing and data mining? How do businesses use these tools?

Systems Analysis and Design (Shelly Cashman Series) (MindTap Course List)

What happens in an electrical circuit when the resis tance increases?

Automotive Technology: A Systems Approach (MindTap Course List)

Imagine the plug of the sink described in Problem 9.36 leaks. If it now takes 250 seconds to fill the sink to i...

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

Briefly discuss the advantages and disadvantages of frequent software upgrades.

Principles of Information Systems (MindTap Course List)

How can you determine approximately how much data you will transfer each month?

Enhanced Discovering Computers 2017 (Shelly Cashman Series) (MindTap Course List)

If your motherboard supports ECC DDR3 memory, can you substitute non-ECC DDR3 memory?

A+ Guide to Hardware (Standalone Book) (MindTap Course List)

How can cutting torch tip seals be repaired?

Welding: Principles and Applications (MindTap Course List)