JP2512544Y2 - Coreless motor commutator - Google Patents

Description

[Detailed Description of the Invention] [Technical field of the invention] The present invention relates to a commutator of a coreless motor, and more specifically, commutation of a coreless motor in which a segment portion and a coil base portion, which are separately molded, are combined and integrated. It is about children.

[Background of Invention and Problems of Prior Art] First, the background of the present invention will be described with reference to FIG.

FIG. 2 shows a conventional coreless motor 1, in which a rotary shaft 5 penetrating a frame 3 of the motor is rotatably provided by a bearing 7, and a plurality of magnetic pole pairs N surrounding the rotary shaft 5 are provided.
And S are cantilevered from the motor frame 3 in the direction of the rotating shaft 5 to form a stator.

On the rotary shaft 5 on the cantilevered free end side of the magnetic pole pair N and S, a segment portion 11 is provided in an annular shape slit through a mold portion 9 of an electronic insulating material, and the segment portion 11 is made of conductive brushes 13, 13. Is in contact with.

The segment portion 11 is a coil base portion 15 that is a rising portion of the same mold portion 9 near the magnetic pole pairs N and S, and has a cantilevered tubular coil portion 17 corresponding to the magnetic pole pairs N and S.
Are fixed to the outer periphery of the coil base portion 15 with an adhesive.

Originally, the coreless motor 1 is used for a small motor, and the commutating segment portion 11 is formed by molding a copper tubular body and then slitting the segment portion 11 so that each segment portion 11 becomes independent. is there.

In FIG. 2, the portion of the coil base 15 above the rotary shaft 5 is not hatched, which indicates the slit portion 19 in which the slit for separating the segment portion 11 is cut by machining.

As is clear from the above description, since the segment portion 11 and the coil base 15 of the conventional coreless motor 1 are the integrally molded portion 15, the bonding when the coil portion 17 is bonded to the outer periphery of the coil base portion 15 is performed. There is a disadvantage that the agent penetrates into the segment portion 11 through the slit portion 19 due to the capillary phenomenon, and the smoothness of contact and sliding between the conductive brush 13 and the segment portion 11 and the conductivity are hindered.

[Purpose of Invention and Outline thereof] The purpose of the present invention is to eliminate the above-mentioned disadvantages of the conventional commutator.
(EN) A commutator in which 11 and a coil base portion 15 are separately formed and manufactured, and slit processing is performed only on the segment portion 11 so that the slit portion 19 is not left in the coil base portion 15.

[Embodiment of the Invention] In FIG. 1 showing an embodiment of the present invention, a segment portion 11 and a coil base portion 15 in which a conductor wire as a commutator is omitted.
It shows a state in which only the mold portions of are combined and integrated.

The segment portion 11 shown in more detail in FIGS. 3A and 3B is divided into, for example, five pieces by the slit portion 19, and the axial hole 21 side is made to project toward the axial center with a cutting and raising tool such as chisel. An anchor unit 23 is provided.

Further, the end of the segment portion 11 on the side of the coil base portion 15 is molded in a mold in a state of standing up in the radial direction with respect to the shaft center, and after the molding, finish machining of the shaft hole 21 and the shaft hole
The outer peripheral cutting of the segment part 11 is performed based on 21.

The coil base portion 15 shown in FIGS. 4A and 4B is molded integrally with the rotary shaft 5, and has a recess 25 into which the molding portion 9 around the segment portion 11 is fitted, and a segment. A groove portion 29, which is relatively shallow and is located inside the outer peripheral surface, into which the radial rising portion 27 (also referred to as a riser) of the portion 11 is inserted is formed.

It should be noted that the hole 31 that penetrates the coil base portion 15 on the front and back sides is provided substantially at the center of the groove portion 29 into which the riser 27 is inserted, because it is one of spot welding machines when the wire end of the coil wire is fused to the riser 27. This is for inserting poles and the like.

[Effects of the Invention] As will be understood from the above description of the embodiments, the present invention is, in short, formed by integrally molding the coil base portion 15 on the outer periphery of which the coil portion 17 can be adhered with an adhesive and the rotary shaft 5. Provided in the central portion of one side surface of the coil base portion 15, and provided with a radial groove portion 29 communicating with the concave portion 25 and located inside the outer peripheral surface, and provided with a radial riser 27. A segment portion 11 is fixed by a mold, and a mold portion 9 obtained by dividing the segment portion 11 into a plurality of parts by a slit portion 19 is provided, and the mold portion 9 is fitted and fixed in the concave portion 25 of the coil base portion 15. The riser 27 of the mold portion 9 is engaged with the groove portion 29 of the coil base portion 15.

As is apparent from the above structure, in the present invention, the coil base portion is formed by adhering the coil portion 17 to the outer periphery with an adhesive.
15 is molded integrally with the rotary shaft 5, and the segment part
The mold portion 9 in which 11 is fixed by molding is molded separately from the coil base 15, and the segment portion
11 is divided in advance by a slit portion 19.
Then, the recess 25 provided in the central portion of the coil base portion 15
The mold portion 9 is fitted and fixed to the coil base portion, and the radial riser 27 provided in the mold portion 9 is attached to the coil base portion.
It is formed by engaging in a groove portion 29 located inside the outer peripheral surface of 15.

That is, in the present invention, since the coil base portion 15 and the mold portion 9 are separately manufactured and combined, the segment portion 11 of the mold portion 9 is slit.
When it is divided into a plurality of parts by 19, there is no need to form a slit part in the coil base part 15. Therefore, when the coil portion 17 is bonded to the coil base portion 15 with the adhesive, the adhesive does not flow through the slit portion 19 to the mold portion 9.

Further, since the groove portion 29 with which the riser 27 engages is also located inside the outer peripheral surface, the adhesive does not flow through the groove portion 29.

Furthermore, since the coil base portion 15 and the mold portion 9 integrally molded with the rotary shaft 5 are separately manufactured and assembled, remolding or the like is unnecessary, and a thermosetting resin can be used as the molding resin. Therefore, heat resistance is improved and efficient assembly work can be performed.

[Brief description of drawings]

FIG. 1 is a side sectional view of a commutator according to an embodiment of the present invention, FIG. 2 is an explanatory view of a conventional coreless motor for explaining the background of the present invention, and FIGS. 3A and 3B are the present invention. FIG. 4A, a front view of the segment portion of the embodiment of FIG.
FIG. 2B is a front view of the coil base of the embodiment of the present invention and a central sectional view thereof. (Explanation of the symbols indicating the main parts of the drawing) 1 ... coreless motor, 9 ... mold part 11 ... segment part, 15 ... coil base part 19 ... slit part 27 ... rising part (riser)

Claims (1)

(57) [Scope of utility model registration request] 1. A coil base portion (15) which can be adhered to the outer periphery of a coil portion (17) by an adhesive is integrally molded with a rotary shaft (5), and one side surface of the coil base portion (15) is provided. Is provided with a recess (25) in the center thereof, a radial groove (29) communicating with the recess (25) and located inside the outer peripheral surface, and having a radial riser (27). 11) is fixed by a mold, and a mold part (9) formed by dividing the segment part (11) into a plurality of parts by a slit part (19) is provided.
The mold portion (9) is fitted and fixed in the concave portion (25) of 5), and the riser (27) of the mold portion (9) is placed in the groove portion (29) of the coil base portion (15). A commutator for a coreless motor, characterized by being engaged with each other.