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Resistor :

6 pole induction motor with slipring rotor on the crane lifts the load at the speed of 1.2 m/s. The rotation speed is 960 rpm and is connected to the 50 Hz power grid. At which speed will the motor lift the same load if the rotation ring is connected through sliprings to the resistors so that the resistivity increases N times a phase.

Rotations :

Meters per second :