Axially compact small fan
AssigneePapst-Motoren GmbH & Co. KG
InventorsFritz Schmider, Edgar Zuckschwert
Life of this patent
Estimating the term…
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.
Claims19
Flat portable fan with an impeller on a motor shaft and a commutatorless direct current motor having a printed circuit board in the stator and having an axially magnetized permanent magnet in the rotor, the circuit board being made of an iron base material with an insulating layer thereon and comprising a printed circuit having the electronic components of the fan drive, made from an iron base material with an insulating layer, the circuit board carrying stator windings and an axial starting bearing for the rotor, the impeller being mounted in a cylindrical rotor mounting support and being driven by the axially magnetized permanent magnet, and the iron base material and the permanent magnet substantially defining a planar air gap.
Flat portable fan comprising:
- a commutatorless direct current drive motor having a motor shaft, a stator, and electronic control components;
- an air impeller rotor structure mounted directly on the motor shaft, the structure providing the dual function of both the rotor of the motor and the impeller of the fan;
- an axially magnetized permanent magnet mounted internally of the impeller rotor structure, the impeller rotor being mounted in a cylindrical rotor mounting support and being driven by interaction between the stator and the axially magnetized permanent magnet;
- a printed circuit board mounted on the stator, the printed circuit board being constructed of iron as a base material with an insulating layer thereon, the iron base material providing the dual function of both a component of strength for a mounting base and a magnetic yoke for the motor;
- a printed circuit on the insulating layer of the circuit board having thereon the electronic control components of the motor;
- stator windings mounted on the insulating layer of the circuit board;
- an axial starting bearing for the rotor carried by the printed circuit board;
- and
- the iron base material and the permanent magnet defining substantially a planar air gap.
Dependencies are inferred from the claim text.