by Jacek F. Gieras
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