High speed spindle motor and apparatus equipped with high speed

Details High speed spindle motor and apparatus equipped with high speed High speed spindle motor and apparatus equipped with high speed

1995-12-19

1998-09-08

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310179, 310181, 310254, 316259, H02K 700, H02K 1100

Patent

active

058048960

ABSTRACT:
A spindle motor comprises a permanent magnet having an outer diameter, an outer circumference, and a number of poles. A stator core is disposed around and spaced from the outer circumference of the permanent magnet rotor. The stator core has a yoke portion, a number of lengthwise extending and circumferentially spaced slots, and a tooth portion between each adjacent two of the slots. The slots are disposed in close proximity to the outer circumference of the permanent magnet rotor, and a width of each of the slots in a radial direction of the stator core is smaller than a width of the yoke portion and equal to or greater than 1/20 of the outer diameter of the permanent magnet rotor. A coil has two or less turns and is comprised of a conductor disposed in the slots of the stator core.

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