JPS622951Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to the structure of a chiyoke coil for noise prevention in a small commutator motor.

(Purpose) The purpose of the present invention is to provide a chiyoke coil, which is installed inside the motor body, at a simple structure and at low cost, in order to prevent the noise generated by the small commutator motor itself from affecting the outside. This is what I am trying to do.

(Prior Art) Commutator motors generate noise due to the generation of commutated sparks. Various noise preventers are used to prevent this noise from affecting radio wave receivers and the like.
In order to prevent noise in the frequency range from tens of megahertz to hundreds of megahertz, which overlaps with the reception frequency of FM radio and television receivers, it is effective to connect a chiyoke coil to the electrical input circuit near the spark generator. Usually, the coil is installed inside the motor body.

Fig. 1 shows a conventional example in which a small commutator motor is provided with a chiyoke coil. 1 is a chiyoke coil, which is wound several times around an air core, and has lead wires 1a and 1b integrated with it. It is covered with a heat-shrinkable synthetic resin tube 2 that prevents fraying and also serves as an electrically insulated wire. 3 is a holder substrate made of electrical insulator, which is connected to the stator core 5 by screws 4.
, and a brush holder 6 is attached thereto. 7
is a brush, and 8 is a commutator. A stator coil 9 is electrically insulated and housed within the stator core 5, and has a terminal 10. and terminal 10
is fixed to the holder substrate 3. Lead wires 1a and 1b of the two chiyoke coils 1 are soldered to each of the two brush holders 6 and each terminal 10 of the two stator coils 9. In this way, the structure of holding the chiyoke coil 1 at the ends of the lead wires 1a and 1b is such that even if it is installed more securely by electric welding instead of soldering, the chiyoke coil 1 may be damaged by vibrations caused by motor rotation or shocks during startup. may move and come into contact with rotating parts such as commutator 8, or the lead wire 1
There was a risk that parts a and 1b might break or their soldered parts might come off.

(Solution Means) In order to eliminate the above-mentioned conventional drawbacks, the present invention is such that the holder substrate is provided with a winding frame for the stator coil, the terminal end of the stator coil is extended, and the electric wire for the coil is attached to the winding frame. A chiyoke coil is formed by winding the winding, and the chiyoke coil itself is fixed to the winding frame, thereby eliminating the risk of movement or damage of the chiyoke coil.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. 2 and below. In FIG. 2, a holder substrate 11 is made of a synthetic resin molded product and is provided with a winding frame 12. As shown in detail in FIG. 3 and its cross-sectional view in FIG. The terminal end 1 of the stator coil 9 between
5 is extended by the electric wire 1
6 is formed. In this case, the terminal 10 is not provided. Reference numeral 17 constitutes an end portion of a chiyoke coil, which is soldered or electrically welded to the brush holder 6. These ends 15 and 16 may be attached with some tension to prevent fraying, but
Either by fixing it to the winding frame 12 using a thermosetting adhesive or the like, or by providing a cut groove 18 or the like in the collar 14 or the like in which the electric wire is fit tightly, and the end portion 17 passes through the groove. It may also be a fixed structure.

In FIG. 4, a cylindrical iron core 19 is inserted into a round hole 20 provided in the center of the winding frame 12 and glued to the coil 16.
In combination with this, the noise prevention effect can be increased or the frequency band over which the effect can be applied can be increased.

FIG. 5 shows another embodiment, in which a holder board 21 is provided with a winding frame 22 which also serves as a boss for fixing to the stator core 5 using screws 4, and the stator coil A chiyoke coil 23 is formed by an electric wire whose terminal end 15 of the wire 9 is extended. In FIG. 5, the winding frame 22 may be constructed separately from the holder substrate 21, like the winding frame 24 in FIG. 6. In these FIGS. 5 and 6, since the screw 4 passes through the chain coil 23, it has an effect similar to that of the iron core 19.

(Effects) As described above, according to the present invention, since the chiyoke coil is attached to the winding frame integrated with the motor, the chiyoke coil itself does not move or vibrate, and therefore, it can be easily attached to the mounting part such as by soldering. Since no abnormal force is applied, there is no risk of damage, especially when installing the iron core, the structure is simple, and the weight of the iron core is not added to the chain yoke coil, so it is safe from the above-mentioned damage, etc., and prevents the yoke coil from fraying. Countermeasures are also relatively easy. On the other hand, since the mounting position and direction of the chiyoke coil are determined, the noise prevention effect between the motors is uniform, and since the wire of the chiyoke coil is an extension of the stator coil,
Conventionally, thicker wire was used to securely hold the chiyoke coil itself, but since the thinner wire is used, the required number of turns can be obtained sufficiently, and it also contributes to improved performance. It's a big idea.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the structure of a motor showing a conventional example, FIGS. 2 and 5 are schematic diagrams of the structure of a motor showing the first and second embodiments of the present invention, and FIG. 4 is a sectional view thereof, and FIG. 6 is another embodiment of the winding frame of the present invention. In the figure, 11 and 21 are holder substrates, 12 and 22 are winding frames thereof, 15 are stator coil terminals, and 16 and 2
3 is a noise prevention coil.

Claims (1)

[Scope of utility model registration request] A cylindrical winding frame forming a collar forming a structural part of the holder substrate is provided, and an extension of the end of the stator coil electric wire is wound through a groove formed in the collar of the winding frame. Structure of noise prevention coil for small commutator motor.