Rotating electric machine usable in radioactive environment

Details Rotating electric machine usable in radioactive environment Rotating electric machine usable in radioactive environment

1998-11-06

2000-07-25

Ponomarenko, Nicholas

Electrical generator or motor structure

Dynamoelectric

Rotary

310 89, 310 90, 508581, 508552, 384476, 384627, 2505151, 376287, H02K 504, H02K 506, H02K 515

Patent

active

060939885

ABSTRACT:
The invention relates to a rotating electric machine including (a) a rotor having a rotating shaft; (b) a bearing for supporting the rotating shaft; (c) a radiation resistant grease applied to the bearing; and (d) a shield layer for shielding the grease from radiation. The shield layer is made of lead and surrounds the bearing. The shield layer includes (1) a first cylindrical shield member that is positioned to cover the bearing, such that the bearing is shielded from a first radiation that is in a direction substantially perpendicular to an axis of the rotating shaft, and (2) second and third disk shield members that are positioned to interpose therebetween the bearing in a direction along the axis of the rotating shaft, such that the bearing is shielded from a second radiation that is in a direction substantially along the axis of the rotating shaft. Thus, the rotor of this rotating electric machine is stably supported in the bearing for a long time even under a highly radioactive environment. That is, the rotating electric machine can be rotated stably for a long time.

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patent: 3716732 (1973-02-01), Tillma
patent: 4711732 (1987-12-01), Arakawa
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patent: 4766387 (1988-08-01), Browne et al.
patent: 4909641 (1990-03-01), McKenzie
patent: 5569643 (1996-10-01), Kinoshita et al.
patent: 5814824 (1998-09-01), Hamby et al.

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