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Fan and selecting method for motor size thereofFan and selecting method for motor size thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080014102, Fan and selecting method for motor size thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001]This Non-provisional application claims priority under 35 U.S.C. .sctn.119(a) on Patent Application No(s). 095126094 filed in Taiwan, Republic of China on Jul. 17, 2006, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002]1. Field of Invention [0003]The invention relates to a fan and the method for selecting the motor size thereof. In particular, the invention relates to a method for selecting matching, corresponding fan and motor sizes to achieve optimal efficiency. [0004]2. Related Art [0005]As electronic products increase in performance, frequency, speeds, and compactness, they inevitably encounter the problem of excessive heat production. Such heat results in elevated temperature and system instability. Therefore, heat dissipation has become one of the most important issues in designing electronic products. [0006]Using a fan as the heat dissipating device is one common solution. As shown in FIG. 1, a conventional fan 3 includes a frame 31, an impeller 32, and a motor 33. The impeller 32 is accommodated in the frame 31, and includes a hub 321 and several blades 322 disposed around the hub 321. The motor 33 connects to the hub 321 and drives the blades 32. The motor 33 includes stator structure 331 and a rotor structure 332. The rotor structure 332 is pivotally disposed in the stator structure 331. The magnetic interaction between the rotor structure 332 and the stator structure 331 drives the hub 321 to rotate the blades 322 so that air flow can be generated. [0007]To increase the air flux and pressure of the fan 3, a key factor is the selection of fan size and blade shape. An appropriate choice of fan size can help achieve the goals of maximal performance, minimal energy consumption, and minimal noise. During the development of fans 3, the sizes of the motor 33 and the frame 31 have often been decided by the developer's experience or trial and error. No experience or theoretical formula between them is available to people working in the field. This increases the time and efforts for designing and thus the production cost. [0008]Therefore, it is highly desirable to provide a high-performance and low-noise fan and the method for selecting the motor size thereof that reduces the development time. SUMMARY OF THE INVENTION [0009]In view of the foregoing, the invention is to provide a high-performance and low-noise fan and the method for selecting the motor size thereof that reduces the development time. [0010]To achieve the above, the invention discloses a fan including a frame, an impeller, and a motor. The impeller is accommodated in the frame. The motor drives the impeller and includes a rotor structure and a stator structure. The dimension Y of the frame and the diameter X of the stator structure meet an equation of Y=CX.sup.n, where C is a constant and n is a variable number. [0011]To achieve the above, the invention also discloses a method for selecting the motor size of a fan. The method includes the steps of: providing a frame with a dimension Y of a frame and a stator structure with a diameter X; and obtaining the diameter X of the stator structure or the dimension Y of the frame according to an equation of Y=CX.sup.n. Wherein, C is a constant and n is a variable number. [0012]As mentioned above, the invention requires that the frame dimension and the motor size meet the equation of Y=CX.sup.n. In comparison with the prior art, the invention can indeed find a suitable combination of the frame dimension and motor size. It achieves the goals of reducing the development time, maximizing the performance, and minimizing noise in the fans. BRIEF DESCRIPTION OF THE DRAWINGS [0013]The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein: [0014]FIG. 1 is a schematic view of the conventional fan; [0015]FIG. 2 is a schematic view of the fan according to a preferred embodiment of the invention; [0016]FIG. 3 shows the relation between the dimension of the frame and the diameter of the stator structure in a fan according to the preferred embodiment; and [0017]FIG. 4 is a flowchart of the disclosed method for selecting the motor size of a fan according to the preferred embodiment. DETAILED DESCRIPTION OF THE INVENTION [0018]The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements. [0019]Please refer to FIG. 2. The fan 2 according to a preferred embodiment of the invention includes a frame 21, an impeller 22, and a motor 23. In the preferred embodiment, the fan 2 is an axial-flow fan. Continue reading about Fan and selecting method for motor size thereof... Full patent description for Fan and selecting method for motor size thereof Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fan and selecting method for motor size thereof patent application. Patent Applications in related categories: 20090291001 - Centering coupling for electrical submersible pump splined shafts - An electrical submersible well pump assembly having a pump, a pump motor, and a seal section. The motor drives the pump via shafts rotatingly coupled with a coupling assembly. The coupling assembly includes an alignment device that maintains the shaft ends in coaxial alignment. 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