JP4119661B2 - Electric motor stator and method of manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a stator of an electric motor having a stator core having an iron core yoke part and an iron core tooth part and a coil wound thereon, and a method for manufacturing the same.
[0002]
[Prior art]
In conventional electric motors, insulation resin coating members formed on the stator core by insert molding, etc., and attachment for attachment to external devices such as washing machines on part of the iron core yoke of the stator core When winding the stator core using the mounting part in which the hole is formed, the stator core is fixed to the winding machine by holding the mounting hole or the entire mounting part. Winding around the iron core teeth.
[0003]
[Problems to be solved by the invention]
However, if the stator core is held by a mounting hole or mounting portion provided in a part of the insulating resin coating member, there is a problem with the strength of the resin. It was necessary to increase the number. In addition, in order to form a mounting hole in a part of the iron core yoke part, it is necessary to avoid the main magnetic path part, and the yoke part shape is increased accordingly, so extra iron core material is required. There was a problem that the weight also increased.
[0004]
The present invention has been made in view of the above, and its purpose is to increase the strength of the resin portion or increase the shape of the yoke portion by adding a simple device to the shape of the stator core. In addition, the present invention provides a structure and method for easily and surely holding a stator core during winding.
[0005]
[Means for Solving the Problems]
The present invention relates to a fixing of an electric motor including a stator core having an annular core yoke portion and a plurality of core teeth disposed around the entire circumference of the core yoke, and a coil wound around the core teeth. The stator is a stator of an electric motor characterized in that a plurality of convex protrusions extending in a radial direction opposite to the core tooth portion are formed on the iron core yoke portion.
[0006]
In addition to the above, the present invention comprises a plurality of segments in which the stator core is connected by a yoke portion in the circumferential direction, and at least one convex protrusion is formed on each segment. This is a stator for an electric motor.
[0007]
In addition to the above, the present invention provides a stator for an electric motor, wherein the stator core is an outer rotor type.
[0008]
In addition to the above, the present invention is a stator for an electric motor in which a coil is concentratedly wound around an iron core tooth portion.
[0009]
According to these inventions, when winding the stator core with the winding machine, the stator core is easily and firmly fixed by engaging the convex protrusions with the corresponding engaging portions. Therefore, there is no need to hold the mounting portion itself formed with the mounting hole for the external device or the mounting hole provided in a part of the insulating resin covering member or the iron core yoke portion. Therefore, it is not necessary to increase the shape or increase the number of the insulating resin mounting portions in order to increase the strength, and to use the mounting holes provided in a part of the iron core yoke portion, It does not increase the weight of the iron core by increasing the shape.
[0010]
Further, the same effect as described above can be expected in the case of a split-type stator core constituted by connecting a plurality of segments at the yoke portion. In addition, in the case of this split-type stator core, as another effect, since at least one convex protrusion is formed in each segment, the stator core is installed in the mold and the stator core At the time of insert molding for forming a covering member made of an insulating resin on the surface, by engaging the convex protrusions of each segment with the concave engaging portion of the insert molding die, the circumferential positioning and fixing of each segment is achieved. It can certainly be done with a simple structure.
[0011]
Furthermore, when the stator core is an outer rotor type, the stator core holding part when winding is performed is on the inner peripheral side of the core yoke part, so the inner rotor type is used to hold the outer peripheral side of the core yoke part. , The force required to generate the same rotational direction torque is increased. Accordingly, when using the mounting holes and mounting portions provided in the insulating resin member, it is necessary to increase the strength as compared with the inner rotor type, so that the effect of implementing the present invention is naturally increased.
[0012]
Further, when the coil is concentratedly wound, it is necessary to swing the stator core at a high speed in the circumferential direction with a small swing width of one magnetic pole pitch. Therefore, the acceleration applied to the fixed portion of the stator core is also increased. Since it becomes big, the implementation effect of this invention is large like the above.
[0013]
Further, the present invention provides a fixed winding in which the core teeth are wound by the cooperation of the circumferential swing of the stator core and the swing of the electric wire supply nozzle in the axial direction of the electric wire and the forward and backward direction toward the stator core. A method of manufacturing a stator, wherein the convex protrusion is engaged with a concave engaging portion of a stator core support jig of a winding machine so that the stator core is fixed, and thereby the stator core is swung in the circumferential direction. It is a manufacturing method of the stator of the electric motor characterized by making a motion.
[0014]
According to the present invention, as in the first reason, when the winding is performed on the stator core, the stator core is easily made by engaging the convex protrusions with the corresponding engaging portions. In addition, since it can be firmly held, there is no need to hold the mounting portion itself formed with the mounting hole for the external device or the mounting hole formed in a part of the insulating resin covering member or the iron core yoke portion. . Therefore, it is not necessary to increase the shape or increase the number of the insulating resin mounting portions in order to increase the strength, and to use the mounting holes provided in a part of the iron core yoke portion, It does not increase the weight of the iron core by increasing the shape.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. In the embodiment, an example in which the present invention is applied to a stator of an outer rotor type DC brushless motor is shown, but the scope of application of the present invention is not limited to this.
[0016]
FIG. 1 is a top view showing the overall configuration of the stator 10 in the embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. In the case of this embodiment, since it is an outer rotor type, an example in which six convex protrusions 70 are provided radially inward from the yoke is shown. Although not shown, there is a rotor on the outer periphery of the stator 10 in which a permanent magnet is disposed in a direction facing the stator 10. The rotor 10 is paired with the stator 10 to constitute an outer rotor type brushless motor. ing. In the case of this embodiment, the coil 50 is divided into 12 sets each in the case of this embodiment, and is wound around each core tooth portion 20a from above the covering member 40. The entire three-phase winding is connected. A convex protrusion is indicated by 70 in the figure. When the winding is performed by the winding machine, the stator core 20 has the convex protrusions 70 formed on the concave engaging portions of the stator core support jig 90 of the winding machine, which will be described later with reference to FIGS. It is held in a shape engaged with 92, and the rotational force in the circumferential direction is transmitted via this convex protrusion 70.
[0017]
FIG. 3 is a top view of the stator core in the first embodiment of the present invention. As shown in FIG. 2 and this figure, the stator core is composed of an annular core yoke portion 20b and a plurality of core teeth 20a projecting radially outward from the core yoke portion 20b. Is formed by laminating thin plates of punched silicon steel sheet. Furthermore, a plurality of convex protrusions 70 are formed on the iron core yoke portion 20b so as to extend radially opposite to the iron core tooth portion 20a.
[0018]
FIG. 4 is a top view of the stator core in the second embodiment of the present invention. As shown in this figure, the stator core 20 in this case is composed of a plurality of segments 30 connected by a yoke portion 20b in the circumferential direction, and each segment 30 has at least one convex protrusion 70. Is formed. In the case of insert molding, the insert molding die has a concave engaging portion corresponding to the convex protrusion 70 of each segment 30, and the positioning and fixing in the circumferential direction is surely performed for each segment. I can do it.
[0019]
FIG. 5 is a partial top view of the stator according to the embodiment of the present invention before the winding is mounted. The stator core 20 is shown in this figure after undergoing a process of covering almost the entire surface of the core tooth portion 20a except for the outer peripheral surface and the convex projection 70 with an insulating resin covering member 40 by insert molding or the like. In the shape, winding to the iron core tooth portion 20a through the covering member 40 is performed.
[0020]
FIG. 6 is a drawing for explaining the arrangement and operation of each part of the stator and the winding machine when winding is performed on the stator by the manufacturing method of the present invention. The stator core 20 is placed on a stator core support jig 90 shown in the figure after undergoing a process such as insert molding. The operation of each part during winding will be described. The stator core support jig 90 is swung in the circumferential direction by a rotation drive device (not shown), and the wire supply nozzle 80 is fixed by a stator axial drive device (not shown). At the same time, it is swung in the front-rear direction toward the stator core 20 by a front-rear drive device (not shown). Winding is performed on the core tooth portion 20a of the stator core 20 by the cooperation of the swings in these three directions. The wire supply nozzle 80 is normally installed in parallel by the number of phases of the coil 50, and winding of each phase is performed simultaneously. In the present embodiment, since it is a three-phase coil, three wire supply nozzles 80 are juxtaposed, although not shown.
[0021]
FIG. 7 is also a top view showing an arrangement configuration when the stator is placed on the stator core support jig 90 in order to perform winding. As shown in this figure, the convex protrusion 70 of the stator core 20 is engaged with the concave engaging portion 92 of the stator core support jig 90 of the winding machine, and the stator core 20 is held firmly. The rotational force in the circumferential direction of the stator core support jig 90 is transmitted from the concave engaging portion 92 to the convex protrusion 70 of the stator core 20, and the stator core 20 is swung in the circumferential direction.
FIG. 8 is a perspective view of the stator core support jig 90 in the manufacturing method of the present invention. The stator core 20 is placed on a gear-shaped base below the stator core support jig 90 in a state where the convex protrusions 70 are engaged with the concave engagement portions 92 of the stator core support jig 90. It is done.
[0023]
In this embodiment, the convex projection 70 has a rectangular cross section, but the cross section has a trapezoidal shape, a semicircular shape, an elliptical shape, and the like so that the stator core 20 is fixed and fixed at the time of winding. Any shape can be used as long as it has a strength capable of transmitting the rotational driving force in the circumferential direction from the core support jig 90. In addition, in this embodiment, the convex protrusion 70 has a circumferential width of about 5 mm and a radial thickness of about 3 mm. In consideration of mechanical strength and ease of engagement, it is desirable that the width is about 3 to 20 mm and the thickness is about 2 to 10 mm.
[0024]
【The invention's effect】
As described above, according to the present invention, the rotational driving force to the stator core during winding can be transmitted through the small convex protrusions formed on the iron core yoke portion. There is no need to increase the overall shape or the number of the mounting parts in order to use the mounting holes or mounting parts provided in a part of the insulating resin member, and the mounting provided in the iron core yoke part. It is not necessary to increase the shape of the yoke portion in order to use the hole. As a result, it has become possible to further reduce the size and weight of the device by adding simple ideas to the shape of the yoke.
.
[Brief description of the drawings]
FIG. 1 is a top view of a stator in an embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a top view of a stator core in an embodiment. FIG. 5 is a partial top view of the stator in the embodiment before the winding is mounted. FIG. 6 is an arrangement configuration of the stator and each part of the winding machine when the stator is wound by the manufacturing method of the present invention. FIG. 7 is a top view when the stator is placed on the core support jig in the manufacturing method of the present invention. FIG. 8 is a perspective view of the stator core support jig.
DESCRIPTION OF SYMBOLS 10: Stator 20: Stator iron core 20a: Iron core tooth part 20b: Iron core yoke part 30: Segment 40: Coating member 50 made of insulating resin: Coil 60: Mounting part 62: Mounting hole 70: Convex protrusion 80: Electric wire supply Nozzle 82: Wire rod 90: Stator core support jig 92: Concave engaging portion

Claims (5)

A stator core 20 having an annular core yoke portion 20b and a plurality of core tooth portions 20a disposed on the entire circumference of the core yoke portion, and the stator core 20 installed in an insert molding die. A covering member made of an insulating resin is formed on the surface of the core core 20 on almost the entire surface excluding the outer peripheral surface of the core tooth portion 20a and the convex protrusion 70, and a coil 50 wound around the core tooth portion 20a is provided. In the electric motor stator 10,
What is the iron core tooth portion 20a that is engaged with the concave engagement portion of the insert molding die and engaged with the concave engagement portion 92 of the stator core support jig 90 of the winding machine? A stator for an electric motor, wherein a plurality of convex protrusions 70 extending in the opposite radial direction are formed. A stator core 20 having an annular core yoke portion 20b and a plurality of core tooth portions 20a disposed on the entire circumference of the core yoke portion, and the stator core 20 installed in an insert molding die. A covering member made of an insulating resin is formed on the surface of the core core 20 on almost the entire surface excluding the outer peripheral surface of the core tooth portion 20a and the convex protrusion 70, and a coil 50 wound around the core tooth portion 20a is provided. In the electric motor stator 10,
What is the iron core tooth portion 20a that is engaged with the concave engagement portion of the insert molding die and engaged with the concave engagement portion 92 of the stator core support jig 90 of the winding machine? The stator core 20 formed with a plurality of convex protrusions 70 extending in the opposite radial direction is composed of a plurality of segments 30 connected in the circumferential direction by the iron core yoke portion 20b. 30 is formed with at least one convex protrusion 70, and the circumferential direction of each segment in the concave engaging portion of the insert molding die corresponding to the convex protrusion 70 of each segment 30. A stator for an electric motor, wherein the positioning and fixing of the motor can be reliably performed.   The stator for an electric motor according to claim 1, wherein the stator core 20 is of an outer rotor type.   The stator of an electric motor according to claim 1, wherein the coil 50 is concentratedly wound around the iron core tooth portion 20 a. Winding is made to the core teeth 20a by cooperation with swinging of the front and rear direction toward the stator axis and the stator core 20 in the circumferential direction of the swing as well as the wire supply nozzle 80 of the stator core 20 The method of manufacturing the stator 10, wherein the convex protrusion is engaged with the concave engaging portion of the insert molding die and engaged with the concave engaging portion 92 of the stator core support jig 90 of the winding machine. 70, are the stator core 20 is fixedly held by engaging with the concave engagement portion 92 of the stator core support jig 90 of the winding machine, is thereby circumferential direction of oscillation of the stator core 20 made is wound by the manufacturing method of the stator of the electric motor according to claim 1 or claim 2, characterized in Rukoto.

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