Brushless DC motor fan driven by an AC power source

Details Brushless DC motor fan driven by an AC power source Brushless DC motor fan driven by an AC power source

1999-12-29

2001-08-21

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C310S063000

Reexamination Certificate

active

06278248

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a brushless direct-current (DC) motor fan that can be driven by an alternating-current (AC) power source.
2. Description of the Related Art
With technology advance, current brushless direct current motor fans can be mass-production in miniature size, light, weight, and compact with stable quality. Although widely used, they are still not suitable for household use, as they can not be driven by alternating current power sources which is available at ordinary house.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a brushless DC motor fan that is not limited to be driven by direct current such that miniature brushless DC motor can be widely and conveniently used.
A brushless DC motor fan in accordance with the present invention includes a conversion circuit for converting alternating current for connection with a sensor element and a drive circuit. Thus, the drive circuit allows the current of the motor coil to be alternately conducted with positive
egative polarity, thereby generating an alternating magnetic field which interact with a permanent magnet of the rotor and cause the motor to rotate.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


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patent: 5099181 (1992-03-01), Canon
patent: 5598073 (1997-01-01), Hans et al.
Sedra et al. “Microelectronic Circuits.” Fourth Edition, p. 202. Oxford University Press, 1998.

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