Design aspects study of active part of squirrel cage rotor using finite element analysis with different surface contacts
Raut, Dinesh (2017)
Diplomityö
Raut, Dinesh
2017
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2017121355800
https://urn.fi/URN:NBN:fi-fe2017121355800
Tiivistelmä
Squirrel cage induction motors are widely used in industrial applications such as in industrial drives, pumps, lathe machine and turbines due to its simple and rugged construction and low maintenance requirements. The rotor of the squirrel cage induction motor determines the motor torque and operational efficiency. Failures of the motor occur due to the failure in the rotor and its components. For designing of the rotor with good performance and mechanical durability the causes of those failures should be minimized.
The main objective of this thesis is to study structural rigidity of squirrel cage rotor with different surface contact between the rotor components. The active part of squirrel cage rotor which is an assembly of the copper bar, end ring and shaft are simulated with the commercial finite element analysis software ANSYS Workbench 18.0. Two designs of the rotors are introduced and with different surface contacts, the active parts are simulated and analyzed to investigate and obtain the research objectives. The investigation of mechanical and thermal stresses generated by the rotor components determines the mechanical stability of the rotor designs. The modification and optimization of rotor parts describe the design aspect and considerations needed to be considered for designing of a rotor with good performance. The best possible options for the surface contact between the components of active part of rotor and the possible material options are obtained as results. The results obtained in form of the equivalent stress and deformation at rotor parts validate the effect of surface contact, thermal condition and design considerations to the stability squirrel cage rotor. The design and analysis result bonded contact as most suitable contact type and need of use of retaining ring for the reduction of stress in the active part of rotor.
The main objective of this thesis is to study structural rigidity of squirrel cage rotor with different surface contact between the rotor components. The active part of squirrel cage rotor which is an assembly of the copper bar, end ring and shaft are simulated with the commercial finite element analysis software ANSYS Workbench 18.0. Two designs of the rotors are introduced and with different surface contacts, the active parts are simulated and analyzed to investigate and obtain the research objectives. The investigation of mechanical and thermal stresses generated by the rotor components determines the mechanical stability of the rotor designs. The modification and optimization of rotor parts describe the design aspect and considerations needed to be considered for designing of a rotor with good performance. The best possible options for the surface contact between the components of active part of rotor and the possible material options are obtained as results. The results obtained in form of the equivalent stress and deformation at rotor parts validate the effect of surface contact, thermal condition and design considerations to the stability squirrel cage rotor. The design and analysis result bonded contact as most suitable contact type and need of use of retaining ring for the reduction of stress in the active part of rotor.