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TRANSCRIPT
Rotor-Stator Electromagnetic Radial Force and
Shaft Deformation for a Hermetic Compressor
Flávio J. H. Kalluf
Marcos G. Dropa de Bortoli
Whirlpool / Embraco – Unidade Compresores
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.
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.
INSIDE THE COMPRESSOR
HEAT
RADIAL FORCE
The heat and the radial force are not usually calculated by the standard motor
simulation programs
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
CURRENT SIMULATION METHOD
2D FEA SIMULATION
DEFORMATION ANALISYS
THERMAL ANALISYS
ANALYTICAL SIMULATION
PROPOSED SIMULATION METHOD
3D FEA SIMULATION (MAXWELL)
ANALYTICAL SIMULATION (RMxprt)
THERMAL ANALISYS (ANSYS MECHANICAL)
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
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.