Coupled Analysis of Mmotor to predict Noise and Vibration
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The document discusses the analysis of noise and vibrations in electric motors, outlining sources of noise such as aerodynamic, mechanical, and electromagnetic factors. It also emphasizes the generation mechanisms of electromagnetic noise, including the impact of design elements like eccentricity and manufacturing errors. Techniques for noise reduction through coupled electromagnetic and structural analysis using numerical simulations are highlighted, showcasing methods to isolate and mitigate various noise sources.
Coupled Analysis of Mmotor to predict Noise and Vibration
- 1. Simulated. Designed. Delivered. Coupled analysis of motor to predict vibration and noise By Mr. Siddesh S Application Engineer ProSIM R&D Pvt. Ltd.
- 2. Simulated. Designed. Delivered.2 Agenda 1. Source of noise in motors 2. Generation mechanism of electromagnetic noise 3. Causes of electromagnetic force in motor 4. Noise reduction techniques 5. Coupled electromagnetic and structural analysis in JMAG
- 3. Simulated. Designed. Delivered.3 Noise sources Aerodynamic Mechanical Electromagnetic Self Load induced Auxiliaries Non-uniform air gap Bearing Balancing Source of noise in motors
- 4. Simulated. Designed. Delivered.4 Fundamental flux is superimposed with harmonics fields. MMF wave in the air gap causes attractive force and tangential forces on stator core and teeth due to zigzag leakage permeance. MMF distributionMagnetic flux wave distributionElectromagnetic force distibution Generation mechanism of electromagnetic noise
- 5. Simulated. Designed. Delivered.5 Electromagnetic force due to eccentricity Distorted flux density Causes of electromagnetic forces in Motor
- 6. Simulated. Designed. Delivered.6 Skewing Rotor and stator slot shape Stator stack dimension Eccentricity Manufacturing errors: tolerances, asymmetries Materials Noise reductiontechniques
- 7. Simulated. Designed. Delivered.7 It is important to know the frequencies at which the radial forces are produced and estimation of amplitude of radial magnetic forces. Magnetomotive force
- 8. www.pro-sim.com engineering your designs Simulation Technology for Electromechanical Design Coupled electromagneticand structural analysis in JMAG ProSIM R&D Pvt Ltd. #4, 1st B Main, 1st N Block, Rajajinagar, Bangalore – 560010 Ph: +91 80 23323020, Fax: +91 80 23323304, Website: www.pro-sim.com
- 9. Simulated. Designed. Delivered.9 Structure of motor 2D Electromagnetic model Electromagnetic force modeling
- 10. Simulated. Designed. Delivered.10 Material specification
- 11. Simulated. Designed. Delivered.11 Electromagnetic flux density distribution Magnetic flux density distribution
- 12. Simulated. Designed. Delivered.12 Electromagnetic force distribution Frequency component of electromagnetic force Electromagnetic force distribution
- 13. Simulated. Designed. Delivered.13 Constraint Rotor mass Rigid body Rigid body 0.44kg Rotor mass Boundary conditions for structural model
- 14. Simulated. Designed. Delivered.14 Eigen mode deformation approximately at 3600 Hz Eigen mode analysis
- 15. Simulated. Designed. Delivered.15 Acceleration distribution at 3600Hz 100mm Sound pressure level distribution at 3600Hz Structural analysis
- 16. Simulated. Designed. Delivered.16 Conclusion 1. The electrical model, which accounts for the influence of mmf space harmonics and determines the air-gap radial flux density, has been successfully analysed with FEM. 2. Numerical simulation allows in particular to virtually isolate the different sources of noise harmonics: winding harmonics can be cancelled by imposing sinusoidal mmfs, PWM harmonics can be removed by imposing sinusoidal currents, saturation harmonics by cancelling saturation permeance harmonics, slotting harmonics by imposing a smooth air-gap, etc.