JPH04355647A - Assembly method of rotating machine feeding apparatus - Google Patents

Abstract

PURPOSE:To place a PTC on a plate-shaped brush holder plate quickly without employing a special spring. CONSTITUTION:A brush placing plate 18a, a PTC 23 and an external power supply connection plate 18b are unified into a single body member and a brush holder 20 is fixed by caulking to a plate-shaped brush holder plate 1 through the single body member.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a rotating electrical machine power supply device having a positive temperature coefficient thermistor for limiting overcurrent.

0002

2. Description of the Related Art Conventionally, this type of power supply device has a positive temperature coefficient thermistor installed inside an insulating motor cover plate that also serves as the end frame of the motor and the brush holder plate, as shown in Utility Model Application Laid-Open No. 2-83651, for example. A hole-shaped thermistor accommodating portion corresponding to the hole-shaped thermistor accommodating portion is provided, and a clamping member made of two electrode plate materials and a positive temperature coefficient thermistor are inserted into this hole-shaped thermistor accommodating portion.

However, such a conventional example requires a motor cover plate having a thickness sufficient to accommodate a positive temperature coefficient thermistor.

0004

However, in some DC motors, the end frame and the brush holder plate are separate bodies, and only a thin plate-shaped brush holder plate is provided. The above-mentioned conventional technology cannot be applied to a device having such a plate-like plate.

[0005] Therefore, an assembly method is desired in which the thermistor is held near the brush without providing a hole-shaped thermistor housing. Moreover, it is desirable that the assembly be completed quickly and that special materials and shapes such as spring members are not required as the material of the electrode plates that sandwich the thermistor.

Therefore, the present invention can hold the thermistor on the plate-shaped brush holder plate, and
It is an object of the present invention to provide a method for assembling a rotating electric machine power supply device, which allows a thermistor to be quickly disposed on a plate-shaped brush holder plate without being held between special springs.

[0007]

[Means for Solving the Problems] Two conductive plates are arranged on a plate-shaped brush holder plate of a rotating electrical machine, and one of the two conductive plates is connected to a brush arranging plate and an external one. The plate is divided into two parts, and the facing surface of the brush arranging plate and the facing surface of the external power connecting plate are integrally formed at the portions where the brush arranging plate and the external power connecting plate face each other. A method for assembling a rotating electrical machine power supply device, wherein a positive temperature coefficient thermistor is sandwiched between the facing surface of the brush arranging plate and the facing surface of the external power supply connecting plate, the method comprising: One end surface of the positive temperature coefficient thermistor is welded to the plate facing surface, and the facing surface of the external power supply connection plate is welded to the other end surface of the positive temperature coefficient thermistor, and the brush arrangement plate, the positive temperature coefficient thermistor, and the external After forming the power supply connection plate into an integral member, the integral member is arranged on the plate-shaped brush holder plate by fixing the brush arranging plate and the brush holder plate, which are part of the integral member. This is a method for assembling a rotating electrical machine power supply device.

[0008]

[Operation] In the method for assembling a rotating electric machine power supply device of the present invention, an integral member consisting of a brush arrangement plate, a positive temperature coefficient thermistor, and an external power supply connection plate is fixed to a brush holder plate. Here, the above-mentioned fixing is performed between the brush arrangement plate and the brush holder plate. Therefore, the positive temperature coefficient thermistor is substantially fixed to the brush holder plate by joining one side of the thermistor to the opposing surface of the brush holder plate, which is integrally formed with the brush holder plate. becomes. On the other hand, the external power supply connection plate is integrally formed with the facing surface of the external power supply connection plate. The positive temperature coefficient thermistor, which is substantially fixed to the brush holder plate as described above, is joined to the surface facing the external power supply connection plate. Therefore, the external power supply connection plate is substantially connected and fixed to the brush holder plate.

That is, in the present invention, at least the brush arranging plate is fixed to the brush holder plate, and the positive temperature coefficient thermistor and the external power supply connection plate are connected and fixed to the brush holder plate. Assembly is possible.

[0010] Furthermore, since the brush arranging plate, the external power supply connection plate, and the positive temperature coefficient thermistor are made into an integral member by welding and then placed on the brush holder plate, a special spring is attached to the brush holder plate. It is possible to arrange the positive temperature coefficient thermistor without sandwiching it.

[0011]

[Effects of the Invention] Therefore, according to the present invention, the thermistor can be held on the plate-shaped brush holder plate, and the thermistor can be quickly disposed on the brush holder plate without being held by a special spring. is possible.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, as shown in FIG. 4, an insulating and plate-shaped brush holder plate 1 is fixed with screws 8 to a housing 7 that covers one end opening side of the rotating electric machine. 6 is a yoke, which includes an armature 2, a commutator 3 and a shaft 4.
The rotor 5 is wrapped around the rotor 5. Two conductive plates 9 and 18 (see FIG. 1 for 18) are disposed on the commutator side end surface 1a of the insulating brush holder plate 1.

As shown in FIGS. 1 and 2, the first conductive plate 9 of the two conductive plates 9 and 18 has four through holes (not shown) formed therein. In addition,
This through hole is located below the brush holder 12 in FIG. Four locking holes 11 are formed in the brush holder plate 1 at positions where the first conductive plate is disposed. In addition, in FIG. 2, only two of the four locations are visible. Note that the through hole of the first conductive plate and the locking hole 11 are arranged to overlap. A brush holder 12 having a U-shaped cross section and having four protruding pieces 12a that pass through the through hole and are engaged in the locking hole 11 is attached to the first brush holder 12.
The conductive plate 9 is disposed on the conductive plate 9, and is caulked and fixed to the four locking holes 11 by the four protruding pieces 12a. The housing-facing opening 12b of the brush holder 12 is covered by a lid 13.

Next, the pigtail 1 is placed inside the brush holder 12.
A brush 15 integrally provided with a brush 15 is pressed and held toward the commutator 3 by a spring 16 (FIG. 4) interposed between the brush 15 and the lid 13. and,
Said pigtail 14 is fixed to the first electrically conductive plate 9. Further, a lead wire 17 from an external power source (not shown) is fixed to the first conductive plate 9.

Next, the second conductive plate 18 of the two conductive plates is composed of a brush arrangement plate 18a and an external power supply connection plate 18b, as shown in FIG. The brush 19, brush holder 20, lid body 21, and spring 16 described above are arranged on the brush holder plate 1 with the brush arrangement plate 18a interposed therebetween in the same manner as described above.

The procedure for assembling the positive temperature coefficient thermistor 23 to the power supply device of the present invention will now be explained with reference to FIGS. 1 and 5. First, each of the brush arrangement plate 18a and the external power supply connection plate 18b is provided with a brush arrangement plate at a portion where the brush arrangement plate 18a and the external power supply connection plate 18b face each other. Plate facing surface 24
a and the external power supply connection plate facing surface 24b are integrally formed in a substantially L-shape. The positive temperature coefficient thermistor P
One end surface 23a of the TC element 23 (hereinafter referred to as PTC) is welded with solder to electrically connect. Furthermore, the PT
The external power connection plate facing surface 24b is welded to the other end surface 23b of C23 using solder to electrically connect. As a result, the brush arrangement plate 18a, the P
The TC 23 and the external power supply connection plate 18b are formed as an integral member.

The brush holder installation plate 18a, which forms a part of the second conductive plate 18, has four through holes 25 similar to the first conductive plate 9.
is formed. Four locking holes 26 (FIG. 2) are also formed in the brush holder plate 1 at the brush placement plate placement position, and the through holes 25 and
It is arranged to coincide with the locking hole 26. A brush holder 20 having a U-shaped cross section and having four protruding pieces 20a that penetrate through the through hole 25 and are engaged in the locking hole 26 is arranged on the brush arrangement plate 18a. Ru. Next, the four protruding pieces 20a are inserted into the four locking holes 26.
is fixed by caulking.

The housing-side opening 20b of the brush holder 20 is covered by a lid 21. A brush holder 19 having a pigtail 27 integrally provided inside the brush holder 20 is pressed and held toward the commutator 3 by a spring 22 interposed between the brush 19 and the lid 21. . Then, the pigtail 27 is fixed to the brush arrangement plate 18a,
A lead wire 28 fixed to the external power supply connection plate 18b is connected to an external power supply (not shown).

As described above, the current from the external power source (not shown) flows from the lead wire 17 to the first conductive plate 9, then sequentially flows to the pigtail 14, the brush 15, the commutator 3, the armature 2, and then the armature. 2 to brush 19, pigtail 27, brush arrangement plate 18a, PTC2
3. External power supply connection plate 18b, lead wire 28
The flow occurs in this order, and the rotor 5 rotates. At this time, when an overcurrent flows through the rotating electric machine, the temperature of the PTC 23 rises, and the resistance value gradually increases. As a result, the PTC23
limits the current and prevents the rotating electrical machine from burning out.

[0021]

[Brief explanation of drawings]

FIG. 1 is a plan view of a power supply device according to an embodiment of the present invention.

FIG. 2 is a front view of a power supply device according to an embodiment of the present invention.

FIG. 3 is a bottom view of a rotating electric machine yoke according to an embodiment of the present invention.

FIG. 4 is a sectional view taken along arrow AA in FIG. 3;

FIG. 5 is a plan view of an integral member used in an embodiment of the present invention.

FIG. 6 is a side view of the integral member shown in FIG. 5, seen from the direction of arrow A.

[Explanation of symbols]

1　Plate-shaped brush holder plate 9 First conductive plate 18 Second conductive plate 18a　Brush arrangement plate 18b External power supply connection plate 23 PTC

Claims (1)

[Claims] 1. Two conductive plates are arranged on a plate-shaped brush holder plate of a rotating electrical machine, and one of the two conductive plates is a brush arrangement plate and an external power supply connection plate. divided into two parts, and a brush arrangement plate facing surface and an external power supply connection plate facing surface are integrally formed at a portion where the brush arrangement plate and the external power supply connection plate face each other, respectively; A method for assembling a rotating electrical machine power supply device in which a positive temperature coefficient thermistor is sandwiched between the facing surface of the brush arranging plate and the facing surface of the external power supply connection plate, the method comprising: one end surface of the positive temperature coefficient thermistor is welded, and the facing surface of the external power supply connection plate is welded to the other end face of the positive temperature coefficient thermistor, and the brush arrangement plate, the positive temperature coefficient thermistor, and the external power supply connection plate are welded. After forming the integral member into an integral member, the brush arranging plate and the brush holder plate, which are part of the integral member, are fixed, thereby making it possible to arrange the integral member on the plate-shaped brush holder plate. Features: How to assemble a rotating electrical machine power supply device.