Induction Motor in 2D: Analysis and Comparison of Torque Methods
Explore the simulation of an induction motor in 2D using COMSOL, evaluating rotational torque, angular speed, and the effect of load torque. Discover the motion of the rotor, torque comparisons, and the relationship between angular speed and AC frequency for torque generation.
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Presentation Transcript
Induction Motor in 2D COMSOL
Induction Motor in 2D Model the induction motor with a conducting rotor cylinder and three phase stator windings The rotational torque and angular speed is evaluated as a function of time The effect of step change in load torque is included Illustration of the induction motor showing the different coil phases.
Arkkios Method - Theory Torque from Maxwell s stress tensor: Average torque for all rings of rotor air gap:
Arkkios Method - Theory
Motion of Rotor The motion of the rotor can be described by This relation is solved automatically when the Rotating Domain node is set to Rigid domain The rotor s moment of inertia is taken from Mass Properties nodes, the applied moment is taken from the Force Calculation
Torque Comparison Torque values from COMSOL s Force Calculation and Arkkio s method are in good agreement The torque goes to zero as soon as the motor is fully accelerated. After that, the load torque is applied.
Angular speed The revolutions per second (RPS) of an induction motor must be slightly different from the AC frequency of the coils in order to generate torque The motor accelerates to 60 RPS which is equal to the AC frequency. No more torque is generated; the motor neither brakes nor accelerates Due to the frequency drop after applying the load torque, there is a mismatch between AC frequency and RPS and the motor generates torque again
