BRIEF DESCRIPTION OF THE DRAWINGS
The invention will become more fully understood from the subsequent detailed description and the accompanying drawings, which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is schematic view of a conventional stator;
FIG. 2 is a schematic view of a first embodiment of the stator according to the invention;
FIG. 3 is a top view of the stator shown in FIG. 2;
FIG. 4 is a top view of a second embodiment of the stator according to the invention;
FIG. 5A is a top view of a third embodiment of the stator according to the invention;
FIG. 5B is a partial exploded view of the stator shown in FIG. 5A;
FIG. 6A is a top view of a fourth embodiment of the stator according to the invention; and
FIG. 6B is a partial exploded view of the stator shown in FIG. 6A.
DETAILED DESCRIPTION OF THE INVENTION
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
FIG. 2 is a schematic view of a first embodiment of the stator according to the invention. FIG. 3 is a top view of the stator shown in FIG. 2. A stator 20 includes a yoke 201. A through hole 202 is disposed on the center of the yoke 201. Both of the through hole 202 and the yoke 201 are arranged concentrically. A plurality of winding portions 203 are disposed around the yoke 201 and extended outwardly. Each of the winding portions 203 can be wound by coils. An end of the winding portion 203 has a protrusion 205 serving as a stopper to prevent the coils from dropping. An arc extension 204 car be engaged with the protrusion 205 of the winding portion 203. In this embodiment, a dovetailed groove 204A of the arc extension 204 is engaged with the protrusion 205.
In this embodiment, the stator 20 can be applied to an external rotor motor. Preferably, the yoke 201 and the winding portions 203 are formed as a unity by stacked silicon steel sheets. A gap d2 between each two adjacent protrusions 205 is larger than the gap d1 of the conventional stator, and thus, the coil with a larger diameter can be wound thereon. After winding, each of the protrusions 205 is engaged with one arc extension 204 to complete the stator windings.
FIG. 4 is a top view of a second embodiment of the stator according to the invention. A stator 30 includes a yoke 301. A plurality of winding portions 303 are disposed inside the yoke 301 and extended inwardly. Each of the winding portions 303 can be wound by coils to form a winding coil. An end of each winding portion 303 has a protrusion 305 serving as a stopper to prevent the coils from dropping. The protrusion 305 is engaged with an arc extension 304. In this embodiment, a dovetailed groove 304A of the arc extension 304 is engaged with the protrusion 305. A through hole 302 and the yoke 301 are arranged concentrically.
In this embodiment, the stator 30 is applied to an internal rotor motor. Preferably, the yoke 301 of the stator 30 and the winding portions 303 are formed as a unity by stacked silicon steel sheets.
FIG. 5A is a top view of a third embodiment of the stator according to the invention. FIG. 5B is a partial exploded view of the stator shown in FIG. 5A. As shown in FIG. 5A, a stator 20A has the same elements with the stator 20 shown in FIG. 3, and thus the description thereof is omitted for brevity. The stator 20A further includes a plurality of bobbins 209 telescoping the winding portions 203. FIG. 5B shows a part of the yoke 201 engaging with the arc extension 204 after telescoping the winding portions 203 by the bobbins 209. The bobbin 209 is in a form of tube for telescoping the winding portion 203. The center size of the bobbin 209 is substantially the same size as that of the winding portions 203. The exterior surface of the bobbin 209 is wound to form a pre-wound wire coil. The pre-wound wire coil telescopes the winding portion 203 to form a stator 20A shown in FIG. 5A.
FIG. 6A is a top view of a fourth embodiment of the stator according to the invention. FIG. 6B is a partial exploded view of the stator shown in FIG. 6A. As shown in FIG. 6A, a stator 30A includes the same elements as the stator 30 shown in FIG. 4, and thus the description thereof is omitted for brevity. The stator 30A further includes a plurality of bobbins 309 telescoping the winding portions 303. FIG. 6B shows a part of the yoke 301 engaging with the arc extension 304 after telescoping the winding potions 303 by the bobbins 309. The bobbin 309 is in a form of tube for telescoping the winding portions 303. The center size of the bobbin 309 is substantially the same size as that of the winding portions 303. The exterior surface of the bobbin 309 is wound to form a pre-wound wire coil. Furthermore, the pre-wound wire coil telescopes onto the winding portion 303 to form a stator shown in FIG. 6A.
In the third and the fourth embodiments, the materials of the bobbin 209 and 309 can be plastic or an insulating material, but the materials are not limited those stated, which can be formed a pre-wound coil with the enameled wire.
In the invention, the engaging manner of the arc extension and the protrusion is not limited to the dovetailed groove, other elements for engaging the arc extension with the protrusion can be used.
In summary, the yoke of the stator according to the invention and the winding portions are formed together and the arc extensions are detachable. Compared with the conventional stator, the stator of the invention is sheathed by the arc extensions to form the stator windings after the stator is wound or is telescoped by the bobbins. Thus, wire jams occurring during winding are prevented, manufacturing time is reduced and efficiency is improved.
While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Patent Application
20080036329
