Abstract
Drives with inverter fed squirrel cage motors, which demand high dynamic behaviour, normally use a direct feedback of rotor speed or rotor position. By inserting a unit with phase locked loop characteristic into the speed feedback loop, the torque will be reduced at fast acceleration on the motor. This effect can be used to improve the behaviour at slip/sliding of wheels in a traction drive.Inserting a phase locked loop in the speed feedback of a 1.4 MW traction drive we confirmed this principle of self-acting reduction of surplus torque. The reaction of the drive in the case of wheel-sliding is advantageous with regard to the reduction of torque achivable by a control loop with measurement of the acceleration rate.
Published Version
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