JPH10257736A - Commutator motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let a projection break through the insulating cover of winding at fusing so as to ensure the electric connection between a commutator piece and winding, by providing a hook part for fixing the winding of a rotor, at the end on the rotor side of the commutator piece, and forming a plurality of projections on the side contacting the winding of the hook part. SOLUTION: A hook part 42 which can electrically connect with the winding 41 of a rotor is made at a commutator piece 38, and further many pieces of projections 43 are made at the section to contact the winding 41 of the hook part 42. In the case of electrically connecting the commutator piece 38 fixed to the rotor and the winding 41 of the rotor with each other by fusing, the projections 43 break through the insulator coating the surface of the winding 41 and electrically connects with the winding 41 without fail, when the hook part 42 is bent, being pressed by an electrode because many projections 43 are made at the hook part 42. As a result, the occurrence of abnormal spark caused by fusing trouble can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator motor.

[0002]

2. Description of the Related Art A conventional commutator motor will be described with reference to FIGS.

The motor 1 forms an outer shell by an air guide 2 made of resin and a bracket 3 made of resin, and a stator 4 is fixed in the bracket 3 and formed on the air guide 2. The plurality of bosses 5 abutted on the upper end surface of the stator 4 to fix the stator 4. The bearing 7 fixed to the load side of the rotor 6 is fixed by the air guide 2, and the bearing 8 fixed to the non-load side is fixed by the bracket 3.

A shaft 9 constituting the rotor 6 has
An impeller 10 protruding from the air guide 2 and rotating together with the shaft 9 and a casing 11 cover the impeller 10. A holder U15 having a built-in slidable carbon brush 14 held by a spring 13 in a deformed pipe 12 is fixed to the bracket 3. The carbon brush 14 is slidably mounted on a commutator 16 fixed to the rotor 6. The commutator 16 is formed by molding a plurality of child pieces 17 made of a copper alloy or the like with a resin 18. A hook portion 19 was formed on the child piece 17, and a winding 20 of the rotor 6 was electrically connected to the hook portion 19 by pressing and heating.

[0005]

SUMMARY OF THE INVENTION Conventional commutator motor 1
In the above, the impeller 10 rotates at a high speed together with the rotor 6 to suck air, and the sucked air passes through the air guide 2, cools the rotor 6 and the stator 4, and is then discharged to the outside of the motor. Air guide 2 for fixing bearing 7 fixed on the load side of rotor 6
In addition, since the bracket 3 for fixing the bearing 8 fixed to the non-load side is made of resin, there is no need to take an insulation distance from the live part, so that downsizing can be achieved, and integration with electrical components and the like is easy. was. The holder 15 fixed to the bracket 3 was composed of a deformed pipe 12 and a carbon brush 14 held by a spring 13 and slidable. The commutator 16 is formed by molding a plurality of child pieces 17 made of a copper alloy or the like with a resin 18. A hook portion 19 was formed on the child piece 17, and a winding 20 of the rotor 6 was electrically connected to the hook portion 19 by pressing and heating.

However, in recent years, the strength and heat resistance of the insulator 21 coated on the winding 20 of the rotor 6 have been improved with the increase in power of the vacuum cleaner. Therefore, it is necessary to increase the pressure and heating during fusing. However, due to the variation in the fusing conditions, for example, if the pressure or heating is insufficient, the winding 20 and the child piece 17 cannot be securely connected, resulting in poor fusing. And could cause abnormal sparks. If the pressure or the heating is too strong, the winding 20 may be unnecessarily crushed and weakened in strength, possibly causing disconnection.

[0007] The present invention is to solve the above-mentioned conventional problems, and it is a first object of the present invention to ensure that the winding and the child piece can be electrically connected with each other even if fusing conditions vary. The purpose is.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotor having a commutator formed by a rotor and a plurality of commutator pieces, and a rotatable commutator-side shaft of the rotor. And a holder U which slidably incorporates a carbon brush urged by a spring on the commutator side formed of a deformed tube, and a rotor is provided at a rotor-side end of the commutator piece. A hook portion for fixing the winding is provided, and a plurality of protrusions are formed on a side of the hook portion which is in contact with the winding. During the fusing, the protrusion breaks through the coating of the winding to reliably rectify. The child piece and the winding are electrically connected, and the quality can be stabilized.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION
A rotor having a commutator formed by a rotor and a plurality of commutator pieces; a bracket rotatably supporting a commutator-side shaft of the rotor; and a spring biased by a spring on a commutator side formed of a deformed tube. And a holder U which slidably incorporates the carbon brush, and a hook portion for fixing a winding of a rotor is provided at a rotor side end of the commutator piece,
Further, a plurality of protrusions are formed on a side of the hook portion which is in contact with the winding, and when the hook portion is pressed by a plurality of protrusions formed on the hook portion, the protrusion coats the winding. The winding and the child piece are securely connected electrically through the body.

According to a second aspect of the present invention, a through hole through which a fusing electrode can be inserted is formed in a hook portion, and a fusing electrode is inserted into the through hole, and a direct winding is formed. Since the insulator can be melted by transmitting heat to the substrate, the same effect as the above-mentioned invention can be obtained.

According to a third aspect of the present invention, a plurality of protrusions are formed on one side of the hook portion in contact with the winding. When the winding is hooked on the hook portion, the winding is formed. Since the protrusion is formed only on one side of the hook even when sliding with the hook portion, the protrusion does not damage the insulator more than necessary, so that an electrical short circuit between the wires can be prevented and the same effect as the above invention can be obtained. It is.

The invention according to claim 4 of the present invention is characterized in that a concave portion having a substantially arc-shaped cross section is formed in a portion of the hook portion in contact with the winding, and the hook portion is formed in a substantially arc shape. When the pressure is applied to the portion, the winding is not unnecessarily crushed, so that the strength of the winding is deteriorated and disconnection can be prevented.

[0013]

【Example】

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

Reference numeral 22 denotes an electric blower main body, in which a rotor 25 having bearings 24 press-fitted on both sides of a shaft 23 is held by an air guide 26 and a bracket 27. The bracket 27 is substantially cylindrical,
An exhaust port 28 is opened below it. On the load side of the rotor 25, the shaft 23
Protrudes, the impeller 29 is fixed there, and the rotor 2
5 and at a high speed (about 36000 rpm). A casing 30 covers an upper part of the impeller 29, and an intake port 30a is opened at a central portion thereof so as to face a suction port 29a of the impeller 29.

The air guide 26 has a fixing portion 32 for fixing an upper end surface of a stator 31 provided in a bracket 27.

A holder 33 is fixed to the bracket 27. The holder 33 is formed by a deformed pipe 34 and a slidable carbon brush 35, and the carbon brush 3
5 is urged by a spring 36 so that it can slide on a commutator 37 fixed to the rotor 25.

The commutator 37 is formed by molding a plurality of commutator pieces 38 made of a copper alloy or the like with a resin 39 (phenol or the like), and press-fit the shaft 23 into the center of the commutator 37. A cylindrical metal tube 40 is molded. The commutator piece 38 is formed with a hook 42 that can be electrically connected to the winding 41 of the rotor 25.
Are formed. The operation of the above configuration is as follows.

When the impeller 29 rotates at high speed together with the rotor 25, air is sucked through the suction port 30a of the casing 30 and the suction port 29a of the impeller 29, and the sucked air is discharged and discharged from the outer periphery of the impeller 29 at high speed. The air is guided to an air guide 26, and the vacuum pressure is gradually converted to atmospheric pressure. Thereafter, the rotor 25 and the stator 31 in the electric blower main body 22 are cooled, and then the air is discharged from an exhaust port 28 formed in a bracket 27. Is discharged.

When the commutator pieces 38 fixed to the rotor 25 and the windings 41 of the rotor 25 are electrically connected by fusing, a large number of hooks 42 are formed on the commutator pieces 38. When the hook portion 42 is bent by being pressed by an electrode (not shown), the projection 43 breaks through the insulator coated on the surface of the winding, thereby forming the winding 41. Can be reliably connected electrically. Therefore, even if the fusing condition varies, the commutator piece 38 and the winding 41 are reliably electrically connected, and the occurrence of abnormal spark due to fusing failure can be prevented.

Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

Hook 42 formed on commutator element 38
A through hole 44 is formed at a position in contact with the winding 41, and the fusing electrode 45 is inserted into the through hole 44 to directly heat the winding part 41. The melted insulator is reliably melted, and the winding 41 and the commutator piece 38 can be reliably electrically connected.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

As described above, when the projection 43 is formed on the entire hook portion 42, the winding 4
1 is a danger that the insulator coated on the windings 41 is damaged more than necessary because the hooks 42 are pulled in a state of being hooked on the hooks 42 and move weakly, and there is a risk of an electrical short-circuit with the adjacent windings 41. There is.

Therefore, as shown in FIG. 5, the protrusion 46 is formed only on one side of the hook portion 42, so that the insulator is not damaged more than necessary. The line 41 can be connected.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

Hook 42 formed on commutator element 38
By providing the substantially arc-shaped concave portion 47 at a position in contact with the winding 41, the winding 41 is not crushed more than necessary even if the hook portion 42 is bent by the electrode during fusing and the pressure is applied. Since the strength of the winding 41 is not degraded, disconnection of the winding 41 can be prevented.

[0027]

According to the first aspect of the present invention,
Since a large number of protrusions formed on the commutator pieces break through the insulating coating of the winding during fusing, the child pieces and the windings can be reliably electrically connected.

According to the second aspect of the present invention, the fusing electrode can directly transfer heat by directly contacting the winding, so that the insulating coating is reliably melted and the winding and the child piece are electrically connected. Can be connected.

According to the third aspect of the present invention, when the winding is hooked on the hook portion before the fusing, the fusing can be performed without damaging the insulating coating of the winding more than necessary.

According to the invention described in claim 4 of the present invention, since the concave portion corresponding to the diameter of the winding is formed in the hook portion of the child piece, the winding is crushed more than necessary at the time of fusing. And can be connected electrically.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an electric blower showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of a commutator of the electric blower.

FIG. 3 is a partially cutaway side view of a rotor of the electric blower.

FIG. 4 is a partial sectional view of a commutator of the electric blower.

FIG. 5 is a front view of a commutator piece of the electric blower.

FIG. 6 is a partial sectional view of a commutator of the electric blower.

FIG. 7 is a partial sectional view of a commutator of the electric blower.

FIG. 8 is a partially cutaway side view of an electric blower showing a conventional example.

FIG. 9 is a partially broken side view of a rotor of an electric blower showing a conventional example.

FIG. 10 is a partial sectional view of a commutator of an electric blower showing a conventional example.

[Explanation of symbols]

 22 Electric blower main body 25 Rotor 37 Commutator 38 Commutator piece 39 Resin part 41 Winding 42 Hook part 43 Projection 44 Through hole 46 Projection 47 Arc-shaped recess

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhisa Morishita 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A rotor having a commutator formed of a rotor and a plurality of commutator pieces, a bracket rotatably supporting a commutator-side shaft of the rotor, a spring formed of an irregularly shaped tube on a commutator side. A holder U which slidably incorporates the carbon brush urged in the above, a hook portion for fixing a winding of a rotor is provided at a rotor side end of the commutator piece, and the hook portion is further provided. Commutator motor having a plurality of protrusions formed on the side in contact with the winding. 2. The commutator motor according to claim 1, wherein a through hole through which a fusing electrode can be inserted is formed in the hook portion. 3. The commutator motor according to claim 1, wherein a plurality of projections are formed on one side of the hook portion in contact with the winding. 4. The commutator motor according to claim 1, wherein a concave portion having a substantially arc-shaped cross section is formed in a portion of the hook portion that contacts the winding.