Spindle motor

Details Spindle motor Spindle motor

1996-12-06

1998-10-13

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 90, 310261, 359198, 359200, 359216, H02K 700, H02K 516, G02B 2608

Patent

active

058216472

ABSTRACT:
A spindle motor comprises a rotational member supported by bearings for rotation about a rotational axis, a rotational body and a motor rotor mounted on the rotational member for rotation therewith, and a motor stator mounted around the motor rotor. The rotational body has an outer diameter determined so that a windage loss of the rotational body is proportional to the third power of a peripheral velocity of the rotational body and an air gap diameter of the bearings and the diameter of the motor stator are determined so that the air loss of each of the bearings and the motor rotor is proportional to the square of the peripheral velocity of each of the bearings and the motor rotor at a range of constant speed of rotation of the rotational member.

REFERENCES:
patent: 4805972 (1989-02-01), Tanaka et al.
patent: 5254893 (1993-10-01), Ide
patent: 5325006 (1994-06-01), Uno et al.
patent: 5434695 (1995-07-01), Saito et al.
patent: 5463490 (1995-10-01), Seto
patent: 5493161 (1996-02-01), Uno et al.
patent: 5535582 (1996-07-01), Paweletz
patent: 5541462 (1996-07-01), Nii et al.
patent: 5555715 (1996-09-01), Paweletz et al.
patent: 5617241 (1997-04-01), Kitazawa

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