JPH08196U - Noise suppressor for small motors and small motors - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a noise suppressor that is extremely unlikely to cause a failure such as wiring disconnection due to vibration or shock, and can be compactly mounted on a small motor, and a small motor including the noise suppressor. A noise generated by fitting a printed circuit board 20 provided with a noise prevention circuit including ceramic capacitors 21a and 21b, choke coils 22a and 22b, a bridge circuit 23, and noise elimination elements 24a and 24b to a bracket 10. The protector is attached to the power input side of the small motor 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a noise suppressor for a small motor and a small motor, and more particularly to a noise suppressor for reducing noise in the current supplied to the small motor, and a small motor equipped with this noise suppressor. It is a thing.

[0002]

[Prior art]

 For example, in a vacuum cleaner, a small motor is attached to the tip of the suction hose, and a rod-shaped object that is also attached to the tip of the suction hose is moved by this small motor to strike the joutan surface or tatami mat surface. A mechanism is known that enables cleaning of tatami mats and tatami mats more efficiently. This type of small motor is usually equipped with a noise prevention circuit. By removing it with the noise prevention circuit, it is possible to accurately control a small motor. In this case, since the small motor is mostly a DC motor, the noise prevention circuit usually has a function of rectifying AC to DC.

The above noise prevention circuit is provided in the vicinity of the mounting position of a small motor and is composed of a rectifying bridge circuit, a noise preventing toroidal core, a smoothing capacitor, a choke coil, and the like. Also, one toroidal core is usually used, and the wirings taken out from the (+) side and (-) side of the bridge circuit are wound around the outer circumference of the toroidal core.

[0004]

[Problems to be solved by the device]

 However, in the conventional noise prevention circuit, the components such as the bridge circuit, the toroidal core, and the choke coil are cluttered in the vicinity of the small motor.Therefore, when vibration or shock is applied to the suction hose, Has the drawback that the wiring is easily cut.

Particularly, the above-mentioned toroidal core for noise prevention is heavy in the above-mentioned components, and since it is usually attached in a state where it is not fixed by screws or the like, it is particularly affected by an impact or the like. , There is a high risk that the wiring will be cut at this part.

In addition, the above-described conventional noise prevention circuit requires a considerable volume to accommodate it, which is also a problem in that it becomes an obstacle when the above-mentioned mechanism is downsized.

In view of the above problems, an object of the present invention is to minimize the occurrence of failures such as disconnection of wiring due to vibration or shock, and to provide a noise suppressor that can be compactly mounted on a small motor, and such a noise suppressor. It is to provide a small motor with a preventer.

[0008]

[Means for Solving the Problems]

 According to the present invention, a printed circuit board provided with a noise prevention circuit and a bracket to which the circuit board is attached, the printed circuit board includes a bridge circuit for rectifying an input alternating current and a direct current of the bridge circuit. The bracket has a pair of noise elimination elements respectively provided on the output side wiring, and the bracket has a board fitting portion on one side and a small motor fitting portion on the other side. It is possible to obtain a noise suppressor for a small motor, which is characterized in that

According to the present invention, there is also provided a noise suppression device for a small motor, wherein the noise removing element has a hollow cylindrical shape and removes high-frequency components in the wiring passing through the hollow cylinder as noise. To be

According to the present invention, there is further provided a noise suppressor for a small motor in which the noise prevention circuit further includes a choke coil and a capacitor connected to the output side of the noise elimination element.

According to the present invention, it is also possible to obtain a noise suppressor for a small motor in which at least one housing for the components constituting the noise prevention circuit is formed on one side of the bracket.

Further, the small-sized motor of the present invention is characterized in that the above-mentioned noise suppressor for the small-sized motor is attached to the power supply input side thereof.

[0013]

[Action]

 As described above, the noise prevention circuit is mounted on the printed circuit board by soldering, etc., and the printed circuit board is fitted to the bracket, which causes failure such as disconnection of wiring due to vibration or impact. It gets harder. Further, in the past, one toroidal core for noise prevention was divided into a pair of noise elimination elements for each wiring as in the present invention, and the noise elimination element has the hollow cylindrical shape as described above. By using it, downsizing can be achieved and the influence of vibration etc. can be suppressed.

If the noise prevention circuit is mounted via the bracket as described above, it can be mounted integrally and compactly to a small motor. In this case, by providing the bracket with the housings for the components of the noise prevention circuit as described above, the vibrations of these components due to the external force can be significantly suppressed and the components can be compactly accommodated.

[0015]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a bracket 10 that constitutes a noise suppressor according to an embodiment of the present invention. The bracket 10 has a capacitor housing hole 11, choke coil housing holes 12a and 12b, and a bridge circuit housing hole 13, and a central hole through which the opposite end of the drive shaft of the small motor is penetrated. It has a central protrusion 19 with 19a. The capacitor storage hole 11, the choke coil storage holes 12a and 12b, and the bridge rectifier storage hole 13 described above are through holes in the illustrated example, but of course may be non-through recesses.

Then, on the outer periphery of the bracket 10, printed board fitting pieces 18a, 18b, 18c, 18d, 18e, 18f, 18g, 18h, 18i of thin plate-like protrusions are formed at predetermined intervals. . These printed circuit board fitting pieces 18a to 18i may be integrally formed, that is, continuously formed on the outer periphery of the bracket 10.

FIG. 2 shows a printed board 20 that constitutes the noise suppressor of the embodiment together with the bracket 10. The printed circuit board 20 is mounted by soldering or the like on a substrate body 28 fitted inside the above-mentioned printed circuit board fitting pieces 18a to 18i, and is connected by wiring or the like formed on the substrate body 28. , A pair of ceramic capacitors 21a and 21b, a pair of choke coils 22a and 22b, a bridge circuit 23, and a pair of noise elimination elements 24a and 24b. Further, on the substrate body 28, connection terminals 25a and 25b for connecting to a brush of a small motor, input terminals 26a and 26b of the bridge circuit 23, and a ground terminal 27 are formed.

Here, the noise removing elements 24a and 24b are of hollow cylindrical shape, and as shown in FIG. 5, remove the high frequency components in the wiring passing through the hollow cylinder as noise. The bridge circuit 23 is resin-encapsulated.

3 and 4 show a state in which the printed circuit board 20 is fitted to the bracket 10 to form the noise suppressor of the embodiment, and the noise suppressor is fitted to the power input side of the small motor 30. It was In this case, the printed circuit board 20 is fitted inside the printed board fitting pieces 18a to 18i on the outer periphery of the bracket 10. The bracket 10 is fitted by inserting the motor fitting piece 17 inside the end of the motor case 31 of the small motor 30.

When the printed circuit board 20 is fitted in the bracket 10, the ceramic capacitors 21 (21 a, 21 b) on the printed circuit board 20 are placed in the capacitor housing holes 11 of the bracket 10, and the choke coils 22 a, 22 b are choked. The bridge circuit 23 is housed in the coil housing holes 12a and 12b, and the bridge circuit 23 is housed in the bridge circuit housing hole 13, respectively. Further, a rubber cap 32 for protecting the opposite side surface of the printed circuit board 20 and the bracket 10 is attached to the opposite side of the small motor 30, as shown in the figure.

In the noise suppressor and the small motor of the embodiment having the above-described configuration, in FIG. 5, the alternating current supplied from the external power supply via the input terminals 26 a and 26 b is rectified by the bridge circuit 23. . The high frequency component of the DC output of the bridge circuit 23 is removed through the noise removing elements 24a and 24b, and the brushes 34a and 34b of the small motor 30 are passed through the ceramic capacitors 21a and 21b and the choke coils 22a and 22b. Is supplied to. This causes the armature 33 of the small motor 30 to rotate.

[0022]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a noise suppressor that is unlikely to cause wiring disconnection due to vibrations and the like and can be compactly mounted on a small motor, and a small motor including the noise preventer.

[Brief description of drawings]

FIG. 1 is an explanatory view of a bracket constituting a noise suppressor according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a printed circuit board having a noise prevention circuit, which constitutes a noise suppressor according to an embodiment of the present invention.

3 is an explanatory view, partly in section, showing a state in which the noise suppressor of the embodiment configured by fitting the printed board of FIG. 2 into the bracket of FIG. 1 is attached to a small motor.

4 is a partial cross-sectional view showing a state in which the noise suppressor of the embodiment configured by fitting the printed circuit board of FIG. 2 to the bracket of FIG. 1 is attached to a small motor, as viewed from an angle different from FIG. FIG.

FIG. 5 is a circuit diagram showing a state in which the noise suppressor of the embodiment is attached to a small motor.

[Explanation of symbols]

 10 bracket 11 capacitor storage hole 12a, 12b choke coil storage hole 13 bridge circuit storage hole 20 printed circuit board 21a, 21b ceramic capacitor 22a, 22b choke coil 23 bridge circuit 24a, 24b noise elimination element 25a, 25b connection terminal 26a, 26b input terminal 27 ground terminal 28 substrate body 30 small motor 31 motor case 32 rubber cap

Claims (5)

[Scope of utility model registration request] 1. A printed circuit board provided with a noise prevention circuit, and a bracket to which the circuit board is attached, the printed circuit board having a bridge circuit for rectifying an input alternating current and a DC output side of the bridge circuit. A pair of noise elimination elements respectively provided on the wiring, wherein the bracket is provided with the board fitting portion on one side and the small motor fitting portion on the other side. A noise suppressor for small motors. 2. The noise reduction element has a hollow cylindrical shape,
The noise suppressor for a small motor according to claim 1, wherein a high frequency component in the wiring passing through the hollow cylinder is removed as noise. 3. The noise suppressor for a small motor according to claim 1, wherein the noise prevention circuit further includes a choke coil and a capacitor connected to the output side of the noise elimination element. 4. A noise suppressor for a small motor according to claim 1, 2 or 3, wherein at least one housing for the components constituting the noise prevention circuit is formed on one side of the bracket. 5. A small motor, characterized in that the noise suppressor for a small motor according to claim 1, 2, 3 or 4 is mounted on the power supply input side thereof.