Dynamoelectric machines with shaft voltage prevention method and

Details Dynamoelectric machines with shaft voltage prevention method and Dynamoelectric machines with shaft voltage prevention method and

1996-08-28

1998-10-13

Stephan, Steve

Electrical generator or motor structure

Dynamoelectric

Rotary

310 72, 310196, 310214, 310215, H02K 0766, H02K 0710

Patent

active

058216529

ABSTRACT:
Damaging shaft voltages in an induction motor are prevented by an electrostatic shield between the stator winding structure and the rotor structure. The electrostatic shield is held at the same potential as the grounded motor frame. The shield includes an aluminum strip in each winding slot, with one strip in firm engagement with the stator core. The strips are flat strips and extend beyond both ends of the slot to the outer end turns of the stator winding. This places that one strip at the ground reference potential of the motor frame. All strips are connected to the one grounded strip by an end ring. All others are insulated from the core. The strips are connected at only one end to avoid a squirrel cage winding affect.

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"Shaft Voltages in Generators with Static Excitation Systems-Problems and Solutions"IEEE Trans. on Energy Conversion, vol. 3, No. 2, Jun. 1988

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