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I have a drawing of a wound rotor induction motor for a crane. This crane motor has 5 forward speeds & 5 reverse speeds implemented by switching in differing amounts of resistance for each speed setting selected. What has got me scratching around is the fact that 8 of the 10 speed selections switch in uneven (unbalanced) amounts of resistances on each of the 3 legs of the rotor.
Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. Is this assumption correct? All the external resistive speed controller examples I can find all have even amounts of resistance switched on to each leg for the variation of speed hence the confusion. I guess in summary will the uneven amounts of resistance cause any great issue in operation?
I would greatly appreciate anyone's comments on this.
Many thanks,
ben.
Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. Is this assumption correct? All the external resistive speed controller examples I can find all have even amounts of resistance switched on to each leg for the variation of speed hence the confusion. I guess in summary will the uneven amounts of resistance cause any great issue in operation?
I would greatly appreciate anyone's comments on this.
Many thanks,
ben.