BRIEF DESCRIPTION OF THE DRAWINGS
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:
FIG. 1 is a sectional view showing a conventional rotor;
FIG. 2 is a sectional view showing another conventional rotor;
FIG. 3 is a flow chart of a manufacturing method of a rotor according to a preferred embodiment of the invention; and
FIG. 4A to FIG. 4D are schematic diagrams showing the rotor manufactured by the manufacturing method shown in FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
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.
Refer to FIG. 3, a manufacturing method of a rotor according to an embodiment of the invention includes the following steps S1 to S4. In the embodiment, the rotor of this embodiment is a rotor of a fan.
With reference to FIGS. 4A and 4B, step S1 provides a substrate 30. In step S2, the substrate 30 is divided into a first patterned area 31, a second patterned area 32 and a third patterned area 33. The substrate 30 is a metal plate, which is made of iron, steel, aluminum, or aluminum alloy. The second patterned area 32 is formed around the first patterned area 31. The third patterned area 33 is connected to the second patterned area 32. In the embodiment, a joint line C1 is defined between the second patterned area 32 and the third patterned area 33. An axial portion H1 is formed at the center of the first patterned area 31.
In the embodiment, the first patterned area 31, the second patterned area 32 and the third patterned area 33 are formed by punching the substrate 30.
With reference to FIG. 4C, in step S3, the first patterned area 31 is processed to form a cylindrical case 31′ having a sidewall 311′. In the embodiment, the cylindrical case 31′ is cylindrical and is formed by processing the first patterned area 31 with a drawing process. The drawing process is, for example, a vacuum drawing process.
Alternatively, the cylindrical case 31′ and the first patterned area 31, the second patterned area 32 and the third patterned area 33 can be simultaneously formed. The cylindrical case 31′ is formed by the punching process. In other words, the step S2 and step S3 above mentioned can be performed simultaneously. As shown in FIG. 4C, because the cylindrical case 31′ has the sidewall 311′, an included angle, which is about 90 degrees, is formed between the second patterned area 32 and the sidewall 311′ of the cylindrical case 31′.
Referring to FIG. 4D, in step S4, the third patterned area 33 is bent towards the cylindrical case 31′ along the joint line C1 by about 90 degrees. Accordingly, the third patterned area 33 becomes the blade(s) 33′ of the rotor. In addition, the second patterned area 32 is defined as a connecting portion 32′, which connects the tubular case 31′ to the blade(s) 33′.
It is noted that, the axial portion H1 is used to connect a shaft if the rotor is combined with a stator. In the embodiment, the axial portion H1 is a through hole.
With reference to FIG. 4D, a rotor according to a preferred embodiment of the invention will be described hereinafter.
As shown in FIG. 4D, the rotor includes a cylindrical case 31′, a connecting portion 32′ and at least a blade 33′. In the embodiment, the cylindrical case 31′ has a sidewall 311′. The connecting portion 32′ is integrally formed with the cylindrical case 31′ and is connected to one end of the sidewall 311′ of the cylindrical case 311′. The blades(s) 33′ is integrally formed with the connecting portion 32′. The detailed descriptions of the rotor of the embodiment are illustrated in the previous embodiment, so the detailed descriptions thereof are omitted.
In summary, the case, the blades and the connecting portion of the rotor of the invention are integrally formed. Thus, the conventional fixing elements are unnecessary, and the blades deformed causing by connecting the blades to the case in the prior art is prevented. In addition, the case of the invention is formed with a cylindrical case so that the rotor is applied to the radial-flux induction motor having higher efficient. Furthermore, the rotor of the invention is integrally formed so that the conventional process with riveting or locking is not necessary. Accordingly, the manufacturing time and the manufacturing cost are reduced.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
Patent Application
20070274834
