JP4068220B2 - Motor noise prevention structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor noise prevention structure applied to a blower motor or the like of a vehicle air conditioner.
[0002]
[Prior art]
As seen in Japanese Patent Laid-Open No. 3-86052, a noise prevention unit is assembled to the end frame of the motor in order to prevent high frequency radio noise generated from the power supply brush portion of the motor. At that time, the noise prevention unit is inserted from the end frame radial direction (perpendicular to the motor shaft), and then the yoke housing is assembled to the end frame and the noise prevention unit from the motor axis direction.
In addition, a noise prevention element consisting of a choke coil and a capacitor, which are components of the noise prevention unit, is electrically connected between the brush of the motor and the terminal. These and the terminal are connected together at the same location. ing.
[0003]
[Problems to be solved by the invention]
However, if the noise prevention unit is assembled in two directions as described above, the automated assembly becomes complicated. Furthermore, when the sirocco fan itself is placed close to the motor side in response to a request to shorten the entire fan motor in the motor axis direction, the periphery of the end frame (joint between the yoke housing and the end frame) is used for a flat end frame. Is arranged so as not to contact the inside of the fan, and the overall length is increased.
Furthermore, it is very complicated to temporarily place the choke coil wiring part while holding it on the terminal member, place the capacitor wiring part at the same location, and bend the terminal member to connect the wiring. Cheap.
[0004]
The present invention solves such a problem. The end frame has a cup shape with a tapered side surface (inclined shape), and the noise prevention unit is arranged in the motor axial direction along the tapered inner wall of the cup shaped end frame. The purpose of this is to enable one-touch mounting from the beginning, to allow the motor and fan to be placed close together, and to improve assembly.
[0005]
[Means for Solving the Problems]
To achieve the above object, a first aspect of the present invention, together with Ru is detachably attached to the cup-shaped end frame to be attached to the yoke housing opening end of the motor, the side wall inner surface of the cup-shaped end frame A noise prevention unit casing having an outer shape along the taper surface of the above and a noise prevention element including at least one of a choke coil and a capacitor are connected to an external power supply connection terminal via a terminal member, and the external power supply connection A noise prevention circuit that is connected to a brush that is pre-installed in the casing such that a terminal is disposed at a terminal connection portion and that is attached to a brush holder fixed to a cup-shaped end frame of the motor; Each cup-shaped end frame has an engaging portion that engages with each other. While being the noise preventing unit to one-touch can be mounted from the axial direction of the motor the casing along the tapered inner wall of the cup-shaped end frame, while housed in the side wall inner surface of the cup-shaped end frame, the terminal connection of the casing The part is arranged outside the motor. Further, in the present invention, the terminal member of the noise prevention unit includes a choke coil connection portion and a capacitor connection portion provided inside the motor, and a terminal connection portion provided outside the motor.
[0006]
[Action]
According to the motor noise prevention structure of the present invention, according to the above configuration, the noise prevention unit can be assembled to the cup-shaped end frame with one touch in the motor axial direction, and radiation of radio noise can be prevented and the assembly can be performed. Can be easily automated, and the overall length can be shortened by the close arrangement of the motor and the fan.
Further, the capacitor, choke coil and terminal member can be easily connected.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention shown in the drawings will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is an exploded explanatory diagram showing a main part structure thereof.
1 and 2, reference numeral 1 denotes a motor armature, 2 denotes a motor commutator, 3 denotes an output shaft, 4 denotes a yoke housing, and 5 denotes a permanent magnet fixed to the inner wall of the yoke housing 4. A sirocco fan 6 fixed to the output shaft 3 blows air from the vehicle air conditioner. 7 is a cup-shaped end frame, 8 is a casing of a noise prevention unit, 9 is a brush, and 10 is a pigtail. Reference numeral 11 denotes a brush holder, which is molded from resin so as not to transmit the vibration of the brush 9 to the cup-shaped end frame 7. A capacitor 12 and a choke coil 13 are electrically connected to the brush 9 by a pigtail 10. Reference numeral 14 denotes a terminal member, which connects the capacitor 12 with the capacitor connecting portion 14a and the choke coil 13 with the choke coil connecting portion 14b.
[0008]
A hook 8a is formed in the casing 8 of the noise prevention unit. When the casing 8 is inserted into the cup-shaped end frame 7, it is caught in the hole 7a and fixed.
After assembling the casing 8 on the inner surface of the side wall of the cup-shaped end frame 7 in the motor axial direction, the yoke housing 4 is assembled in the motor axial direction so that only the terminal connection portion 14c goes out of the motor from the notch 4a. wear.
[0009]
The casing 8 of the noise prevention unit is resin-molded and has an outer shape along the tapered surface on the side wall inner surface side of the cup-shaped end frame 7 made of metal. The main part of the noise prevention unit can be obtained simply by the hook 8a coming out of the end frame. All fit within the end frame, preventing noise from leaking outside. A pair of choke coil storage portions are provided on the inner side. This storage portion does not cover the choke coil 13 but is supported from the bottom and from the left and right. Further, a recess for storing the capacitor 12 is provided. Further, the terminal support portion 15 protrudes to the outside of the cup-shaped end frame 7 and the yoke housing 4 so that the terminal connection portion 14 c can extend outside the motor. The terminal member 14 is connected to the capacitor 12 through a capacitor connecting portion 14a, and is connected to the choke coil 13 through a choke coil connecting portion 14b. The casing 8 is formed so as to facilitate assembly by exposing these connecting portions. Connection was facilitated by providing the terminal member 14 with three connection portions independently.
[0010]
The yoke housing 4 is provided with a pair of notches for mounting the brush holder and a notch for mounting the terminal support 15 of the noise prevention unit.
As shown in FIG. 1, the yoke housing 4 can be brought close to the sirocco fan 6 by the cup-shaped end frame 7, and the entire fan motor can be shortened in the axial direction. The terminal connection portion 14 c extends to a place where it does not hit the sirocco fan 6.
[0011]
Next, the operation of the above configuration will be described.
First, when a fan switch (not shown) is turned on, power is supplied to the motor terminal connection portion 14c, the noise prevention circuit, the pigtail 10, the brush 9, the commutator 2, and the armature 1 through the electric circuit of the vehicle air conditioner. The sirocco fan 6 is rotated through the output shaft 3 by the rotational driving force, and air blowing is started.
At that time, the high frequency noise generated by the electrical intermittent operation at the contact power feeding portion of the commutator 2 and the brush 9 is absorbed by the capacitor 12 and the choke coil 13 of the noise prevention unit, thereby preventing the emission of radio noise to the outside. . Furthermore, noise emission is prevented by making the end frame a metal cup.
[0012]
【The invention's effect】
As is clear from the above description, according to the present invention, the noise prevention unit can be easily assembled to the cup-shaped end frame having a tapered surface. In that case, the noise prevention unit can be inserted and assembled in the same direction as the yoke housing. That is, since the noise prevention unit can be mounted on the casing along the tapered inner wall of the cup-shaped end frame with one touch from the motor axial direction, the assembly can be automated. Further, since the connection of the choke coil and the capacitor to the terminal member is made at a different location, complicated work such as temporary arrangement and temporary fixing that occur when the connection portions are gathered at the same location becomes unnecessary, and the assembling property is improved.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
2 is an exploded explanatory view showing a main part structure in FIG. 1. FIG.
[Explanation of symbols]
1 ... armature, 2 ... commutator, 3 ... output shaft,
4 ... Yoke housing, 5 ... Permanent magnet,
6 ... Sirocco fan, 7 ... Cup-shaped end frame,
8 ... Noise-proof unit casing, 9 ... Brush,
10 ... Pigtail, 11 ... Brush holder,
12 ... Capacitor, 13 ... Choke coil,
14 ... Terminal member, 14a ... Capacitor connection part,
14b ... Choke coil connection, 14c ... Terminal connection,
15 ... Terminal support

Claims (1)

With Ru is detachably attached to the cup-shaped end frame to be attached to the yoke housing opening end of the motor, the casing of the noise prevention unit having an outer shape along the tapered surface of the side wall inner surface of the cup-shaped end frame, A noise prevention element including at least one of a choke coil and a capacitor is connected to an external power supply connection terminal via a terminal member, and the external power supply connection terminal is preinstalled in the casing so as to be disposed at the terminal connection portion. And an anti-noise circuit connected to a brush attached to a brush holder fixed to the cup-shaped end frame of the motor, and engaging portions are formed on the casing and the cup-shaped end frame, respectively. Rutotomoni, cup-shaped Endofu said casing The noise preventing unit to one-touch can be mounted from the axial direction of the motor along the tapered inner wall of the over-time, while housed in the side wall inner surface of the cup-shaped end frame, by placing the terminal connection portion of the casing to the outside of the motor Motor noise prevention structure.

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