Flexible serrated abradable stator mounted air gap baffle for a

Details Flexible serrated abradable stator mounted air gap baffle for a Flexible serrated abradable stator mounted air gap baffle for a

1976-06-01

1981-04-28

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 55, H02K 900

Patent

active

042648343

ABSTRACT:
An improved air gap baffle is disclosed for a dynamoelectric machine of the type having an air-tight casing filled with a cooling gas, a stator core, a rotor defining an air gap with the stator core, and a means for recirculating the cooling gas through the stator core and the rotor. The baffle is an annular member which is disposed in the air gap between the stator core and the rotor for defining air gap zones having different cooling gas pressures and/or gas flow in opposing directions. The baffle comprises a flexible abradable member having a serrated tip in sealing relationship with the rotor. The baffle improves sealing between adjacent air gap zones by minimizing running clearances and by providing a labyrinth seal. The flexible nature of the baffle reduces the possibility of damage to either the baffle or the rotor during assembly and thereby allows the dynamoelectric machine to be assembled with minimal running clearances between the baffle and the rotor. The baffle material is electrically nonconductive which serves to minimize eddy current losses in the dynamoelectric machine.

REFERENCES:
patent: 3110827 (1963-11-01), Baudry
patent: 3265912 (1966-08-01), Baudry
patent: 3271600 (1966-09-01), Philofsky
patent: 3348081 (1967-10-01), Willyoung
patent: 3439202 (1969-04-01), Wanke
patent: 3906265 (1975-09-01), Giles

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