Axially compact small fan

Details Axially compact small fan Axially compact small fan

1991-02-22

1993-01-05

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

4174231, F04B 1704, F04B 3504

Patent

active

051765098

ABSTRACT:
A flat portable fan with an impeller on a motor shaft and a commutatorless direct current motor is provided having a printed circuit board in the stator and an axially magnetized permanent magnet in the rotor. The circuit board comprises a printed circuit having electronic components of the fan drive and is made from an iron base material with an insulating layer, which carries the stator windings and an axial starting bearing for the rotor. The impeller is mounted in a cylindrical rotor mounting support and is driven by the axially magnetized permanent magnet. The iron base material and the permanent magnet substantially define a planar air gap.

REFERENCES:
patent: 4128364 (1978-12-01), Papst et al.
patent: 4861237 (1989-08-01), Shiraki et al.
patent: 4955791 (1990-09-01), Wrobel
patent: 5028216 (1991-07-01), Harmsen et al.
patent: 5049770 (1991-09-01), Gaeth et al.

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