Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-03-20
2001-12-25
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S071000, C310S043000, C310S254100
Reexamination Certificate
active
06333579
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stator for an outer rotor-type multi-pole generator, including a stator core, a bobbin covering a most part of the stator core, the stator core and the bobbin being coupled by molding to each other, and coils of an identical type but different from a coil wound around a particular one of a plurality of cylindrical portions integrally provided in the bobbin so as to cover a plurality of salient poles of the stator core, the coils of the identical type being wound around a pair of the cylindrical portions adjoining and located on opposite sides of the particular cylindrical portion, the coils of the identical type being connected to each other through a crossover wire. Particularly, the present invention relates to an improvement in a structure of insulating the coil wound around the particular cylindrical portion and the crossover wire from each other.
2. Description of the Related Art
A stator for an outer rotor-type multi-pole generator having coils wound around a plurality of cylindrical portions integrally included in a bobbin so as to cover a plurality of salient poles included in a stator core is already known from Japanese Patent Application Laid-open No.9-93849 and the like. In such a stator, coils of the identical type but different from the coil wound around a particular one of the cylindrical portions may be wound around a pair of the cylindrical portions adjoining and located on the opposite sides of the particular cylindrical portion. In this case, if the pair of coils of the identical type are connected to each other outside the stator, it is necessary to connect two of four output wires extending from the coils of the identical type at a subsequent step, or it is necessary to ensure a space for disposition of a terminal for every output wire in the stator. For this reason, in order to ensure that a labor for connecting the wires at the subsequent step can be eliminated and moreover, the space required for the disposition of the terminal can be reduced, it is a conventional practice that a single continuous lead wire is wound around both of the cylindrical portions of the bobbin to form a pair of coils of the identical type, and that portion of the lead wire, which connects the coils of the identical type to each other, is disposed as a crossover wire along a portion of an outer periphery of a guide projection included in the bobbin. However, the conventional guide projection is formed into a cylindrical shape at a location near base ends of the cylindrical portions and hence, the crossover wire is disposed in a portion corresponding to the particular cylindrical portion in proximity to the base end of the particular cylindrical portion, whereby there is a possibility that the crossover wire may be brought into contact with the coil wound around the particular cylindrical portion to produce a short circuit. For this reason, in the prior art, an insulating tape is wound by an operator around at least that portion of the coil wound around the particular cylindrical portion, which is located on the side of the crossover wire.
The winding of the insulating tape by the operator as in the prior art may result in a variability in insulating property, and may bring about an increase in operating steps.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a stator for an outer rotor-type multi-pole generator, wherein the wire wound around the particular cylindrical portion and the crossover wire can be insulated from each other to ensure a stable insulating property, while avoiding an increase in operating steps.
To achieve the above object, according to a first aspect and feature of the present invention, there is provided a stator for an outer rotor-type multi-pole generator, comprising a stator core including a plurality of salient poles projectingly mounted at equal distances from one another on an outer periphery of a core base formed into a ring shape, and a bobbin made of a synthetic resin, wherein the bobbin is integrally provided with a main bobbin portion covering at least the outer periphery of the core base, a plurality of cylindrical portions protruding from the main bobbin portion so as to cover the salient poles excluding tip ends of the salient poles, and a guide projection which protrudes in a cylindrical shape from one end surface of the main bobbin portion, the stator core and the bobbin being coupled by molding to each other, and coils of an identical type but different from a coil wound around a particular one of the cylindrical portions are wound around a pair of the cylindrical portions adjoining and located on opposite sides of the particular one of the cylindrical portions, a crossover wire connecting the coils of the identical type being disposed along a portion of an outer periphery of the guide projection, and wherein the guide projection has a recess which is provided therein at a location corresponding to the particular one of the cylindrical portions integrally included in the bobbin, the recess being concaved inwards in a radial direction of the core base, the crossover wire being disposed in the recess.
With the arrangement of the above first feature, the crossover wire can be disposed in a portion corresponding to the particular cylindrical portion at a location relatively spaced apart from a base end of the particular cylindrical portion. Moreover, the guide projection having the recess is formed without any variability upon molding of the bobbin, and it is unnecessary for an operator to wind an insulating tape for the purpose of ensuring an insulating property. Therefore, the particular cylindrical portion and the crossover wire can be insulated from each other to ensure a stable insulating property, while avoiding an increase in operating steps.
To achieve the above object, according to a second aspect and feature of the present invention, there is provided a stator for an outer rotor-type multi-pole generator, comprising a stator core including a plurality of salient poles projectingly mounted at equal distances from one another on an outer periphery of a core base formed into a ring shape, and a bobbin made of a synthetic resin, wherein the bobbin is integrally provided with a main bobbin portion covering at least the outer periphery of the core base, a plurality of cylindrical portions protruding from the main bobbin portion so as to cover the salient poles excluding their tip ends, and a guide projection which protrudes in a cylindrical shape from one end surface of the main bobbin portion, the stator core and the bobbin being coupled by molding to each other, and coils of an identical type but different from a coil wound around particular one of the cylindrical portions, the coils of the identical type being wound around a pair of the cylindrical portions adjoining and located on opposite sides of the particular one of the cylindrical portions, respectively, a crossover wire connecting the coils of the identical type being disposed along a portion of an outer periphery of the guide projection, and wherein the particular one of the cylindrical portions integrally included in the bobbin is integrally provided at a base end thereof with a collar which protrudes outwards from an outer periphery of the coil wound around the particular one of the cylindrical portions, the crossover wire being disposed between the collar and the guide projection.
With the arrangement of th above second feature, the collar is disposed between the coil wound around the particular cylindrical portion and the crossover wire, and the collar protrudes outwards from the outer periphery of the coil wound around the particular cylindrical portion. Therefore, even if the guide projection is disposed at a location near the base ends of the cylindrical portions, the contact of the coil wound around the particular cylindrical portion with the crossover wire can be avoided. Moreover, the collar is formed without any variability upon molding of
Hirano Hidetoshi
Tozuka Masayuki
Arent Fox Kintner & Plotkin & Kahn, PLLC
Dinh Le Dang
Nguyen Tran
Sawafuji Electric Co. Ltd.
LandOfFree
Stator for outer rotor-type multi-pole generator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stator for outer rotor-type multi-pole generator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stator for outer rotor-type multi-pole generator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2567117