Simulation and Analysis of Electrodynamic Forces at the End of Stator and Rotor Windings of Large Variable Speed Generating Motors
The end winding structure of the stator and rotor of the large variable speed generating motor is complex.When the motor has a sudden short-circuit and other fault conditions,it will produce a strong impulse current on the stator rotor end winding,so that a large electromagnetic force is generated on the winding bar.If the end of the wire rod is not tied securely,it may cause displacement or deformation of the wire rod,and even insulation damage and other faults.In this paper,a simulation analysis is carried out based on the electrodynamic force at the end of the stator and rotor winding of a 414MW variable speed power generating motor.Firstly,a finite element simulation model of the three-dimensional end magnetic field of the variable speed power generating motor is established.Then,the stator and rotor currents are calculated for the variable speed power generating motor when two-phase sudden short-circuit and three-phase sudden short-circuit occurs under rated working conditions,and they are used as the boundary conditions for the finite element simulation.Finally,the electrodynamic force at the end of the stator and rotor windings of the variable speed power generating motor is simulated and calculated,and the distribution law of the electrodynamic force under the short-circuit fault condition is obtained.
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