Pumps – Motor driven – Electric or magnetic motor
Reissue Patent
1995-01-05
2001-07-03
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S423100, C310S268000, C310SDIG006
Reissue Patent
active
RE037261
ABSTRACT:
The invention relates to a flat or shallow constructed small or portable fan with an impeller or fan wheel on a motor shaft and with a commutatorless direct current (d.c.) motor as the drive. The said direct current motor has only one coil on a circuit board in the stator. The rotor has an axially magnetized permanent magnet.
Such fans are known from De-OS 38 38 367 and German Utility models G 87 02 271 and G 87 14 988.
The known fans are characterized by a relatively small volume. However, an even flatter fan construction is required for various applications, also in connection with measures for minimizing sound transmission from the fan to the environment.
The problem of the invention is to make such a fan more compact in the axial direction, while simultaneously reducing manufacturing costs.
According to the invention this problem is solved by a configuration of the fan drive and the fan in which the radially directed fan blades allow rotation to take place in both directions. The arrangement of the driving coil, driving electronics and magnetic yoke is kept axially compact through the use of a printed circuit board, and iron is used as the so-called base material. The overall height of the portable fan is less than 30 mm.
REFERENCES:
patent: 4128364 (1978-12-01), Papst et al.
patent: 4513812 (1985-04-01), Papst et al.
patent: 4737672 (1988-04-01), Kazami
patent: 4806808 (1989-02-01), Grecksch
patent: 4861237 (1989-08-01), Shiraki et al.r
patent: 4891537 (1990-01-01), Shiraki et al.
patent: 4955791 (1990-09-01), Wrobel
patent: 4961017 (1990-10-01), Kakinoki et al.
patent: 5028216 (1991-07-01), Harmsen et al.
patent: 5045740 (1991-09-01), Hishinuma
patent: 5049770 (1991-09-01), Gaeth et al.
patent: 8702271 (1987-06-01), None
patent: 87149885 U (1987-11-01), None
patent: 383867A1 (1988-11-01), None
Schmider Fritz
Zuckschwert Edgar
Freay Charles G.
Papst Licensing GmbH & Co. KG
Welsh & Katz Ltd.
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