Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-02-25
1994-10-18
Peckman, Kristine L.
Electrical generator or motor structure
Dynamoelectric
Rotary
384112, H02K 516, H02K 708, F16C 3206
Patent
active
053571622
ABSTRACT:
A spindle motor with an H-type pneumatic dynamic bearing has a high durability against repeated starts and stops of rotation. The H-type bearing is composed of a radial bearing member, thrust plates firmly fixed to opposite ends of the radial bearing member and a cylindrical radial sleeve, which form a radial pneumatic dynamic bearing and thrust pneumatic dynamic bearings. A stator core is fixedly secured around a rotary member, which is in turn fixedly secured around the cylindrical radial sleeve. A total thrust clearance a+a' of the thrust bearings is represented by an inequality of (a+a')/A< 2.5/10.sup.4 based on a sliding surface diameter A of each thrust plate, a and total radial clearance b+b' of the radial bearing is represented by an inequality of (b+b')/B<5/10.sup.4 based on a sliding surface diameter B of the radial bearing member.
REFERENCES:
patent: 3950039 (1976-04-01), Huber et al.
patent: 4984881 (1991-01-01), Osada et al.
patent: 5127744 (1992-07-01), White et al.
patent: 5142173 (1992-08-01), Konno et al.
Osada et al., "Spiral Groove Ceramic Bearings and Their Application to Products", Ebara Engineering Review, No. 143, pp. 19-20, Apr. 1989 & partial translation thereof.
Aiyoshizawa Shun-ichi
Hirokawa Kazuto
Kasahara Kazuyuki
Maruyama Tohru
Ebara Corporation
Peckman Kristine L.
To E.
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