Noise of Polyphase Electric Motors: 1st Edition (Hardback) book cover

Noise of Polyphase Electric Motors

1st Edition

By Jacek F. Gieras, Chong Wang, Joseph Cho Lai

CRC Press

392 pages | 170 B/W Illus.

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pub: 2005-12-12
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Description

Controlling the level of noise in electrical motors is critical to overall system performance. However, predicting noise of an electrical motor is more difficult and less accurate than for other characteristics such as torque-speed. Recent advances have produced powerful computational methods for noise prediction, and Noise of Polyphase Electric Motors is the first book to collect these advances in a single source. It is also the first to include noise prediction for permanent magnet (PM) synchronous motors.

Complete coverage of all aspects of electromagnetic, structural, and vibro-acoustic noise makes this a uniquely comprehensive reference. The authors begin with the basic principles of noise generation and radiation, magnetic field and radial forces, torque pulsations, acoustic calculations, as well as noise and vibration of mechanical and acoustic origin. Moving to applications, the book examines in detail stator system vibration analysis including the use of finite element method (FEM) modal analysis; FEM for radial pressure and structural modeling; boundary element methods (BEM) for acoustic radiation; statistical energy analysis (SEA); instrumentation including technologies, procedures, and standards; and both passive and active methods for control of noise and vibration.

Noise of Polyphase Electric Motors gathers the fundamental concepts along with all of the analytical, numerical, and statistical methods into a unified reference. It supplies all of the tools necessary to improve the noise performance of electrical motors at the design stage.

Reviews

"The presented book has a strong monograph attributes and the description of technical material is in the form of tutorials and technology overviews, combining fundamentals and advanced material. …The book is an attractive reference book for research, consulting and development engineers who are interested in design of modern electrical machines. Also, it can be used for advanced senior-level course as well as partially in undergraduate course in university."

-IEEE Industrial Electronics Society Newsletter, Vol. 54, No. 2, June 2006

"Showing the strong relation between the mechanical vibration and the acoustics is particularly a great value of this book . . . represents the highest level of the theoretical explanation across many relevant areas including the electromagnetic field theory, the physics and the acoustics . . . a valuable reference book for those working with the noise of motors and the noise control in general."

– Dr. Laszlo Timar-Peregrin, in Acoustics Australia, December 2007

Table of Contents

GENERATION AND RADIATION OF NOISE IN ELECTRICAL MACHINES

Vibration, Sound, and Noise

Sound Waves

Sources of Noise in Electrical Machines

Energy Conversion Process

Noise Limits and Measurement Procedures for Electrical Machines

Deterministic and Statistical Methods of Noise Prediction

Economical Aspects

Accuracy of Noise Prediction

MAGNETIC FIELDS AND RADIAL FORCES IN POLYPHASE MOTORS FED WITH SINUSOIDAL CURRENTS

Construction of Induction Motors

Construction of Permanent Magnet Synchronous Brushless Motors

A.C. Stator Windings

Stator Winding MMF

Rotor Magnetic Field

Calculation of Air Gap Magnetic Field

Radial Forces

Other Sources of Electromagnetic Vibration and Noise

INVERTER-FED MOTORS

Generation of Higher Time Harmonics

Analysis of Radial Forces for Nonsinusoidal Currents

Higher Time Harmonic Torques in Induction Machines

Higher Time Harmonic Torques in Permanent Magnet (PM) Brushless Machines

Influence of the Switching Frequency of an Inverter

Noise Reduction of Inverter-Fed Motors

TORQUE PULSATIONS

Analytical Methods of Instantaneous Torque Calculation

Numerical Methods of Instantaneous Torque Calculation

Electromagnetic Torque Components

Sources of Torque Pulsations

Higher Harmonic Torques of Induction Motors

Cogging Torque in Permanent Magnet (PM) Brushless Motors

Torque Ripple Due to Distortion of EMF and Current Waveforms in Permanent Magnet (PM) Brushless Motors

Tangential Forces vs. Radial Forces

Minimization of Torque Ripple in PM Brushless Motors

STATOR SYSTEM VIBRATION ANALYSIS

Forced Vibration

Simplified Calculation of Natural Frequencies of the Stator System

Improved Analytical Method of Calculation of Natural Frequencies

Numerical Verification

ACOUSTIC CALCULATIONS

Sound Radiation Efficiency

Plane Radiator

Infinitely Long Cylindrical Radiator

Finite Length Cylindrical Radiator

Calculations of Sound Power Level

NOISE AND VIBRATION OF MECHANICAL AND AERODYNAMIC ORIGIN

Mechanical Noise Due to Shaft and Rotor Irregularities

Bearing Noise

Noise Due to Toothed Gear Trains

Aerodynamic Noise

Mechanical Noise Generated by the Load

ACOUSTIC AND VIBRATION INSTRUMENTATION

Measuring System and Transducers

Measurement of Sound Pressure

Acoustic Measurement Procedure

Vibration Measurements

Frequency Analyzers

Sound Power and Sound Pressure

Indirect Methods of Sound Power Measurement

Direct Method of Sound Power Measurement: Sound Intensity Technique

Standard for Testing Acoustic Performance of Rotating Electrical Machines

NUMERICAL ANALYSIS

Introduction

FEM Model for Radial Magnetic Pressure

FEM for Structural Modeling

BEM for Acoustic Radiation

Discussion

STATISTICAL ENERGY ANALYSIS

Introduction

Power Flow Between Linearly Coupled Oscillators

Coupled Multimodal Systems

Experimental SEA

Application to Electrical Motors

NOISE CONTROL

Mounting

Standard Methods of Noise Reduction

Active Noise and Vibration Control

APPENDIX A: BASICS OF ACOUSTICS

Sound Field Variables and Wave Equations

Sound Radiation from a Point Source

Decibel Levels and Their Calculations

Spectrum Analysis

APPENDIX B: PERMEANCE OF NONUNIFORM AIR GAP

Permeance Calculation

Eccentricity Effect

APPENDIX C: MAGNETIC SATURATION

APPENDIX D: BASICS OF VIBRATION

A Mass-Spring-Damper Oscillator

Lumped Parameter Systems

Continuous Systems

SYMBOLS AND ABBREVIATIONS

BIBLIOGRAPHY

INDEX

About the Series

Electrical and Computer Engineering

Learn more…

Subject Categories

BISAC Subject Codes/Headings:
TEC007000
TECHNOLOGY & ENGINEERING / Electrical
TEC008000
TECHNOLOGY & ENGINEERING / Electronics / General
TEC009070
TECHNOLOGY & ENGINEERING / Mechanical
TEC031020
TECHNOLOGY & ENGINEERING / Power Resources / Electrical