Abstract
The paper brings torque, power and efficiency analyses of the traction drive with permanent magnet synchronous motor (PMSM) during flux weakening operation. There is one way to weak flux of rotor permanent magnets - armature reaction caused by negative flux producing current component. On the other hand, the flux producing current component increases total RMS value of stator current. This effect has influence on losses and efficiency of PMSM. The paper investigates power, efficiency, torque and current characteristics in various operation points of PMSM drive.
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