25_4_1620
DESCRIPTION
25_4_1620.pdfTRANSCRIPT
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Rotor-Stator Electromagnetic Radial Force and
Shaft Deformation for a Hermetic Compressor
Flvio J. H. Kalluf
Marcos G. Dropa de Bortoli
Whirlpool / Embraco Unidade Compresores
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DESCRIPTION AND MOTIVATIONS
DESCRIPTION
EVALUATION OF A INTEGRATED (MAGNETIC-STRUCTURAL-THERMIC) SIMULATION OF A HERMETIC COMPRESSOR FOR REFRIGERATION
MOTIVATIONS
- THE MAGNETIC SOLUTIONS ARE USUALLY STAND-ALONE;
- THE SIMULATION PROGRAMS ARE NORMALLY IN VARIOUS DIFFERENT LANGUAGES, WHICH DIFFICULTS THE INTEGRATION;
- THE INTEGRATION MAKES THE ANALYSIS FASTER AND RELIABLE;
- THE LAST VERSIONS OF ANSYS WORKBENCH ALLOWS THE INTEGRATION OF MAGNETIC AND MECHANICAL SIMULATIONS.
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INSIDE THE COMPRESSOR
VARIABLE-SPEED COMPRESSOR STATOR / ROTOR
The variable-speed compressors are the state-of-the-art motors for refrigeration
compressors, and requires an electronic control.
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INSIDE THE COMPRESSOR
HEAT
RADIAL FORCE
The heat and the radial force are not usually calculated by the standard motor
simulation programs
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RADIAL FORCE
PERFECTLY CENTERED
FORCES ARE BALANCED RESULTANT FORCE=0
RADIALLY DISPLACED
FORCES ARE UNBALANCED RESULTANT FORCE>0
An additional negative effect of the radial misalignment is the higher flux density
in one side of the stator, which can reduce the motor efficiency.
Higher
flux density
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CURRENT SIMULATION METHOD
2D FEA SIMULATION
DEFORMATION ANALISYS
THERMAL ANALISYS
ANALYTICAL SIMULATION
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PROPOSED SIMULATION METHOD
3D FEA SIMULATION (MAXWELL)
ANALYTICAL SIMULATION (RMxprt)
THERMAL ANALISYS (ANSYS MECHANICAL)
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PROJECT SCHEMATIC
Input
ELECTROMAGNETIC
- Geometry - Eccentricity - Current
Output - Radial Force - Electrical Power
Input
STRUCTURAL
- Geometry - Radial Force
Output - Deformation
Input
THERMAL
- Geometry - Electrical Power
Output - Temperature
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MAXWELL RADIAL FORCE / POWER
RADIAL FORCE CURRENT DENSITY
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ANSYS STRUCTURAL - DEFORMATION
RADIAL FORCE
DEFORMATION
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ANSYS THERMAL - TEMPERATURE
CURRENT DENSITY
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modeFRONTIER INTEGRATION
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CONCLUSIONS AND NEXT STEPS
CONCLUSIONS
- The use of a multiphysics platform can increase the speed and precision of motor simulation;
- The integration of magnetic-structural-thermal simulations can be used by the optimization software (workbench node )
NEXT STEPS
-Use the integration for dynamic/transient simulation;
- Evaluate the multiphysics optimization in terms of speed and precision;
-Model the compressor internal temperature / influence of the shell;
- Close the force-deformation-force loop in the magnetic/structural simulation;
-Compare the obtained results with experimental data.