Brushless DC motor having a stable hydrodynamic bearing system

Details Brushless DC motor having a stable hydrodynamic bearing system Brushless DC motor having a stable hydrodynamic bearing system

1990-07-25

1991-07-30

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, 310191, 310268, 384107, 384133, F16C 3906

Patent

active

050362356

ABSTRACT:
A brushless DC motor having a hydrodynamic bearing system includes a stator core having windings arranged thereabout, the stator core rotating about a first center line. The motor further includes a rotor having permanent magnets positioned about an inner diameter thereof, said rotor being rotatable about a second center line. The first center line of the stator core is eccentric to and parallel to the second center line of the rotor such that the magnets exert forces on the stator core which eliminate whirl instability in the rotor.

REFERENCES:
patent: 2761079 (1956-08-01), Giertz-Hedstrom
patent: 3612630 (1971-10-01), Rosensweig
patent: 4135119 (1979-01-01), Brosens
patent: 4552417 (1985-11-01), Yamashita et al.
patent: 4599664 (1986-07-01), Schuh
patent: 4647803 (1987-03-01), von der Heide et al.
patent: 4734606 (1988-03-01), Hajec
patent: 4851731 (1989-07-01), Saotome et al.
patent: 4896065 (1990-01-01), Tsuyama

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