Noise of Polyphase Electric Motors gathers the fundamental concepts along with all of the analytical, numerical, and statistical methods into a unified reference.

Features:

• Provides the most up-to-date and comprehensive treatment of issues related to noise and vibration in electric motors
• Covers analytical, numerical, and statistical methods for noise prediction and analysis, providing concrete examples for each
• Examines vibration and sound radiation of cylindrical shells and the valid conditions of analytical equations
• Presents the fundamental equations for electromagnetic, structural, and acoustic computation of noise and vibration
• Explores SEA principles and applications to electric motors in detail

Contents

Generation and Radiation of Noise 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

• FEM Model for Radial Magnetic Pressure
• FEM for Structural Modeling
• BEM for Acoustic Radiation

Statistical Energy Analysis

• 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

Index

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