Electric motor having a stator and a rotor

Details Electric motor having a stator and a rotor Electric motor having a stator and a rotor

1995-03-02

1998-02-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 310266, 310 90, H02K 516, H02K 2122

Patent

active

057148287

ABSTRACT:
An improved spindle motor, particularly for a hard-disc drive, having a stator in the form of a cylindrical coil carried by a mounting plate and a permanent magnet rotor carried on a rotatable hub. At its outer circumference the rotor generates a field perpendicular to the axis of rotation. A bell-shaped portion of the hub surrounds the coil. The hub is supported on the motor shaft by axial and radial hydrodynamic bearings. A soft-iron sleeve-shaped yoke externally surrounds the coil configuration. This permits the coil to be free of soft-magnetic parts, thereby reducing its inductance and improving the dynamic drive characteristics of the motor. The coil is preferably formed by curved foil windings, so there are no winding slots. This avoids the production of detent torques.

REFERENCES:
patent: 3694907 (1972-10-01), Margrain et al.
patent: 3736543 (1973-05-01), Lademann et al.
patent: 3769698 (1973-11-01), Lademann et al.
patent: 3805104 (1974-04-01), Margrain et al.
patent: 4652149 (1987-03-01), Nakaoka
patent: 4656545 (1987-04-01), Kakuta
patent: 4698542 (1987-10-01), Muller
patent: 4998033 (1991-03-01), Hisabe et al.
patent: 5012359 (1991-04-01), Kohno et al.
patent: 5012571 (1991-05-01), Fujita et al.
patent: 5089732 (1992-02-01), Kohno et al.

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