Cooling Fan Having a Radial-Air-Gap Motor and a Method for Determining the Dimensional Proportion of the Motor

Abstract

A cooling fan having a radial-air-gap motor is disclosed. The cooling fan includes a fan frame, an impeller and a stator assembly. The fan frame has a shaft-coupling portion. The impeller has a hub, a shaft and a plurality of blades. The blades are arranged on an outer periphery of the hub. At least one magnetic element is arranged on an inner periphery of the hub. There is a height between a bottom face of the shaft-coupling portion and a top face of the hub. There is a maximum thickness between the bottommost and uppermost faces of the magnetic plate unit. A ratio of the maximum thickness to the height is between 0.1 and 0.6. A method for determining the dimensional proportion of the motor is also disclosed. The method selects a ratio of a maximum thickness to a height as 0.1 to 0.6.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention generally relates to a cooling fan and a method for determining the dimensional proportion of the motor of the cooling fan and, more particularly, to a slim cooling fan that has a reduced thickness and is equipped with a radial-air-gap motor, as well as a method for determining the dimensional proportion of the motor.[0003]2. Description of the Related Art[0004]In recent years, since the modern electronic products are miniaturized and have high performances, electronic elements inside the electronic product are liable to generate a large amount of heat during the operation of the electronic product. As a result, the heat of the electronic product cannot be expelled smoothly, especially in the small interior space of the electronic product. Disadvantageously, the performance of the electronic product is not stable or is even deteriorated, affecting the reliability of the electronic product. Thus, th...

AI Technical Summary

Benefits of technology

The objective of this invention is to improve the performance of a slim cooling fan with a radial-air-gap motor. By designing the fan structure with a preferred dimensional proportion, it is able to output the necessary amount of air with the proper pressure. This results in a more effective cooling fan.

Problems solved by technology

In recent years, since the modern electronic products are miniaturized and have high performances, electronic elements inside the electronic product are liable to generate a large amount of heat during the operation of the electronic product.

As a result, the heat of the electronic product cannot be expelled smoothly, especially in the small interior space of the electronic product.

Disadvantageously, the performance of the electronic product is not stable or is even deteriorated, affecting the reliability of the electronic product.

Thus, the heat dissipation has become an important issue when designing any electronic product.

Furthermore, for any slim fan that has a radial air gap between the stator and the rotor, although it has been attempted to reduce the height of the fan as much as possible when designing the fan, the motor that is equipped with the fan can have inadequate performance if the stator and the rotor of the fan do not have sufficient magnetic-inducting areas therebetween.

Since there is no rule to be followed when determining the dimensional relation between the motor and the fan frame, it usually takes a large amount of time and effort to design the fan.

Thus, the above formula does not necessarily help in producing a fan with adequate performance.

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