JPH0677475U - Small motor armature - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to automate the process of soldering the varistor to the riser. [Structure] The segment 2 that constitutes the commutator 1 includes a tongue-shaped riser portion 2b extending from the sliding portion 2a. A first U-shaped portion 2c to which the coil end 22b of the coil 22 is connected is provided at the tip of the riser portion 2b, and a second U-shaped portion 2c is provided between the first U-shaped portion 2c and the sliding portion 2a. U-shaped portions 2d are provided respectively. With the cream solder interposed between the segment 2 and the riser portion 2b, electricity is applied so as to penetrate the second U-shaped portion 2d. The Joule heat generated by energization melts the interposed cream solder and solders the varistor 23 and the riser portion 2b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an armature of a small electric motor such as a brush (brush) motor.

[0002]

[Prior art]

 FIG. 4 shows a conventional example of an armature used for a small electric motor, for example, a brush motor. As shown in FIG. 4A, the armature includes a rotating shaft 20, an armature (armature core) 21 fixed around the rotating shaft 20, a coil (winding) 22 wound around the armature 21, It is composed of a varistor 23, a commutator 30 fixed around the rotary shaft 20, and the like. The commutator 30 and the coil 22 are electrically connected. With this structure, power is supplied to the coil 22 via the commutator 30 from a brush (not shown) that constitutes the brushed motor, and a rotating torque is generated in the armature. In addition, the varistor (ring varistor) 23 connected to the commutator 30 by soldering or the like reduces the occurrence of electrical noise when the energization is switched in the commutator 30.

As shown in FIG. 4B, the commutator 30 is configured by fixing a plurality of segments (commutator pieces) 32 to the outer circumference of an insulating holder (commutator holder) 31. In the illustrated example, the plurality of segments 32 are fixed to the holder 31 by being tightened from the outside by a ring 33.

As shown in FIG. 4 (c), the segment 32 has a sliding portion 32 a that is in sliding contact with a brush (not shown) on the arc-shaped outer peripheral surface thereof, and a tongue piece extending outside the sliding portion 32 a. And a riser portion 32b having a shape. The riser portion 32b is provided with a U-shaped portion (bent portion) 32c having a U-shaped cross section for connecting the coil end 22a of the coil 22.

Assembling in this conventional armature is usually performed by the following procedures 1) to 3), for example. 1) The commutator 30 is fixed to the rotating shaft 20. 2) Connect the coil end 22a of the coil 22 to the riser portion 32b of the segment 32. 3) Solder the varistor 23 to the riser portion 32b.

In the above step 2), the work of connecting the coil end 22a to the riser portion 32b is usually performed by the following fusing method. That is, for example, one electrode of the pair of electrodes is brought into contact with, for example, the upper portion of the segment 32, and the other electrode is brought into contact with the tip of the riser portion 32b. Pass a current through. At this time, since the electric resistance of the U-shaped portion 32c, which is a bent portion, is particularly large, Joule heat is generated particularly in the U-shaped portion 32c. The generated Joule heat causes welding while peeling off the coating on the coil end 22a of the coil 22. In addition, a method of pressing the U-shaped portion 32c in the direction in which the opening is closed may be used in combination with the above energization. By adopting such a fusing method, it is possible to automate the above step 2).

On the other hand, in the step 3), the soldering of the varistor 23 to the riser portion 32b is conventionally performed manually by a worker using a soldering iron.

[0008]

[Problems to be solved by the device]

 However, the above conventional armature has the following problems. First, since the varistor must be soldered to the riser by hand, it is difficult to automate the entire process and the manufacturing cost is increased. Therefore, the armature cannot be provided at low cost. Also, since it is manual work, soldering may or may not be possible depending on the degree of skill of the operator, etc., which causes large variations in quality.

Further, it is necessary to secure a space for operating the soldering iron when soldering the varistor to the riser portion. Therefore, it is impossible to adopt a structure in which the commutator is close to the amateur. Recently, along with the miniaturization of various devices, there is a strong demand for small flat motors, but there is also the problem that it is difficult to flatten the armature in response to this type of demand.

An object of the present invention is to make it possible to automate the process of soldering a varistor to a riser portion, to manufacture an armature at low cost without quality variations, and to easily flatten the armature. To provide the armature of.

[0011]

[Means for Solving the Problems]

 In summary, the present invention is configured such that the riser portion of the segment forming the commutator is provided with a bent portion for performing electric resistance heat generation, which is different from the connection portion at the coil end. That is, the armature of the small electric motor of the present invention is extended from the rotary shaft, the armature coil, the holder axially attached to the rotary shaft, the segment fixed to the outer peripheral surface of the holder, and the segment. In the armature of a small electric motor provided with a riser portion to which the coil end of the coil is connected and a varistor mounted on the holder, the riser portion is a first armature to which the coil end of the coil is connected. The present invention is characterized in that a bent portion is provided at a tip end portion of the varistor and a second bent portion is provided near the outer periphery of the varistor.

In a preferred embodiment, the second bent portion is provided, for example, between the first bent portion and the segment. In still another embodiment, the riser portion includes a first tongue piece having the first bent portion and a second tongue piece having the second bent portion. Consists of

[0013]

[Action]

 By providing the second bent portion in the riser portion, the riser portion itself can be heated by heat generated by the electric resistance similar to the fusing method described above using the second bent portion. The heat generated can be used to attach the varistor to the riser section.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an armature of a brushed motor according to an embodiment of the present invention. This armature has the same configuration as the above-described conventional example except for the commutator 1 and the position where the commutator 1 is fixed to the rotary shaft 20. That is, as shown in FIG. 1 (a), this armature includes a rotating shaft 20, an armature 21 fixed around the rotating shaft 20, a coil 22 wound around the armature 21, a varistor 23, and the rotating shaft 20. Commutator 1 fixed to.

Further, in FIG. 1B, the commutator 1 is configured by fixing a plurality of segments 2 on the outer periphery of the holder 31. These segments 2 are fixed by being tightened from the outside by a ring 33.

The segment 2 includes an arc-shaped sliding portion 2a and a tongue-shaped riser portion 2b extending from the sliding portion 2a. A first U-shaped portion (first bent portion) 2c is provided at the tip of the riser portion 2b. The coil end 22b of the coil 22 is connected to the first U-shaped portion 2c. A second U-shaped portion (second bent portion) 2d is provided between the first U-shaped portion 2c and the sliding portion 2a.

The assembling work of the armature of the embodiment having the above configuration is performed, for example, in the following steps (1) to (4). The cream solder may be interposed in the step (3) before the step (1) or the step (2). (1) The coil end 22a of the coil 22 wound around the armature 21 is entwined with the first U-shaped portion 2c. (2) By the same fusing method as described above, electricity is applied so as to penetrate the first U-shaped portion 2c to connect the coil end 22a and the riser portion 2b. (3) The varistor 23 is assembled on the riser portion 2b, and cream solder is interposed between the varistor 23 and the riser portion 2b by coating or the like. (4) For example, one electrode of a pair of electrodes (not shown) is brought into contact with the upper portion of the sliding portion 2a, and the other electrode is brought into contact with the second U-shaped portion 2d, respectively. It flows and is energized so as to penetrate the second U-shaped portion 2d.

In the above step (4), since the electric resistance of the second U-shaped portion 2d, which is the bent portion, is large, Joule heat is generated particularly in the second U-shaped portion 2d. The generated heat is transferred to other parts of the riser section 2d. This heat causes the interposed cream solder to melt, and the varistor 23 and the riser portion 2b are soldered.

In the above embodiment, in the segment 2, the opening of the first U-shaped portion 2c is on the side of the armature 21, that is, the lower side in FIGS. 1 (a) to 1 (c), and the second U-shaped portion. The opening of the shaped portion 2d is on the sliding portion 2a side, but is not limited to this. For example, like the segment 1 shown in FIG. 2, the first U-shaped portion 2c may be opened to the sliding portion 2a side. Further, the second U-shaped portion 2d may be opened on the side of the armature 21.

Further, the first U-shaped portion 2c and the second U-shaped portion 2d may be installed on another tongue provided on the riser portion 2b. FIG. 3 shows an example of this, in which the first U-shaped portion 2c is formed on the first tongue 2e, and the second U-shaped portion 2d is formed on the second tongue 2f. Has been done. In this case, the first and second U-shaped portions 2c and 2d may be arranged side by side at the same height as shown, or the installation height may be changed appropriately.

Further, although the second U-shaped portion 2d is used as the second bent portion in the above-described embodiment, the second bent portion is not limited to the U-shape, and other shapes such as a V-shape. It is also possible to make an appropriate bent shape (shape for easy heat generation).

In addition, various design items can be changed without departing from the scope of the present invention. For example, in the embodiment shown in FIG. 1, the armature is an example of a so-called cored slotted armature provided with an armature (armature core) in which a groove (slot) for coil winding is formed. Needless to say, the present invention is also applicable to a so-called coreless slotless armature having no groove or armature and similar effects can be obtained.

Further, it is needless to say that the present invention can be similarly applied to the armature using the commutator of the type in which the segment is integrally fixed to the holder by insert molding or the like, and the same effect can be obtained.

With the configuration of the above-described embodiment, the heat generated by the riser portion itself can easily solder the varistor and the riser portion together. Therefore, the soldering of the varistor to the riser portion can be automated by a machine. Further, in this automation, the soldering condition is easily controlled, so that the soldering quality is stable.

Furthermore, when soldering the varistor, it is only necessary to bring the energizing electrodes into contact with the sides or above the segments, so that the space required for the soldering iron operation, which has been conventionally required, is not required. As a result, it becomes possible to fix the commutator close to the armature, and it becomes easy to flatten the entire armature.

[0026]

[Effect of device]

 As described above, in the armature of the small electric motor of the present invention, the process of soldering the varistor to the riser portion can be automated by the heat generated by energizing the second bent portion provided in the riser portion of the segment. Therefore, the armature can be provided at low cost and with high quality. Further, in the case of the soldering, a space for operating a soldering iron unlike the conventional case is not necessary, and the commutator can be provided close to the armature, so that the armature can be flattened.

[Brief description of drawings]

1 shows an armature of a brushed motor according to an embodiment of the present invention, (a) is an overall explanatory view, (b) is a partial cross-sectional view of a commutator used in the armature, (c) ) Is an explanatory view of a segment used for the commutator.

FIG. 2 is an explanatory diagram of a segment according to another embodiment of the present invention.

FIG. 3 is a perspective view of a segment according to another embodiment of the present invention.

FIG. 4 shows an armature of a conventional brushed motor, where (a) is an overall explanatory view, (b) is a partial sectional view of a commutator used in the armature, and (c) is a commutator. It is explanatory drawing of the segment used.

[Explanation of symbols]

 1 Commutator 2, 32 Segment 2a Sliding part 2b Riser part 2c 1st U-shaped part 2d 2nd U-shaped part 2e 1st tongue 2f 2nd tongue 20 Rotating shaft 21 Amateur 22 Coil 23 Varistor 31 Holder 33 Ring

Claims (3)

[Scope of utility model registration request] 1. A rotating shaft, an armature coil, a holder axially attached to the rotating shaft, a segment fixed to an outer peripheral surface of the holder, and a coil end of the coil extending from the segment connected to each other. And a varistor mounted on the holder, the riser portion includes a first bent portion to which the coil end is connected, at a tip end thereof. An armature for a small electric motor having a second bent portion located in the vicinity of the outer circumference of the varistor. 2. The armature of a small electric motor according to claim 1, wherein the second bent portion is provided between the first bent portion and the segment. 3. The riser portion has a first tongue piece formed with the first bent portion and a second tongue piece formed with the second bent portion. An armature for a small electric motor according to claim 1.