JP2001016830A - Commutator motor - Google Patents

Abstract

(57) [Problem] To provide a commutator motor capable of preventing a coil from being damaged and suppressing the occurrence of a hyperbar phenomenon. A slit (2) for holding a coil end (24a).
8b formed with a protective slit 27b continuous with the protective portion 2b
7 a is formed radially outward from the resin tube 27 so as to hold the end of the commutator piece 28 on the rotor core side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating shaft rotatably held by a motor case, a rotor core fixed to a middle portion of the rotating shaft, and a resin cylinder fixed to one end of the rotating shaft. A plurality of commutator pieces fixed to the outer periphery of the resin cylinder along the axial direction of the rotating shaft and having a slit; and a coil wound around the rotor core and having its end inserted into the slit and connected thereto. And a commutator motor having a rotor having:

[0002]

2. Description of the Related Art Conventionally, for example, an electric vacuum cleaner using a commutator motor as an electric blower has been known.

FIG. 7 shows the electric blower 1 in a state where a part is omitted and a half is broken about the axis.

[0004] The electric blower 1 has a cylindrical motor case 2 having a case 2a and an end plate 2b which are divided into upper and lower parts in the figure, a rotor 3 positioned at the center of the motor case 2, and an outer periphery of the rotor 3. And a brush unit 5 held by the motor case 2 so as to be positioned at one end of the rotor 3 and a fan cover 8 fixed to the other end of the rotor 3. A centrifugal impeller 6 for sucking outside air from the opening 2 c; and a diffuser 7 located outside the impeller 6.

The rotor 3 includes a rotating shaft 10 rotatably held by a case 2 a and an end plate 2 b via a bearing 9, and a core 11 fixed substantially at the center of the rotating shaft 10 as shown in FIG. And a coil 12 wound around a core 11 and a rotating shaft 1
And a commutator 13 fixed near the other end of the zero.

As shown in FIGS. 4 and 5A, the commutator 13 has a cylindrical metal tube 14, a resin tube 15 located on the outer periphery of the metal tube 14, and a resin tube 15 on the outer periphery of the resin tube 15. And a plurality of commutator pieces 16 located along the axial direction of the rotating shaft 10. The metal tube 14 and the plurality of commutator pieces 1
6 is integrally held by the resin cylinder 15 by insert molding when a molten resin as a material of the resin cylinder 15 is poured into a mold.

A protruding portion 16a is integrally formed on an outer surface of an end of the commutator piece 16 located on the core 11 side.
Further, as shown in FIG. 5B, a slit 16b into which the end 12a of the coil 12 is inserted is formed in the raised portion 16a. The end 12a is fixed in the slit 16b by spot welding.

In such a configuration, when power is supplied to the electric blower 1, the current flowing through the coil 12 and the stator 4
At the same time as the rotor 3 is rotated by the magnetic force, the impeller 6 fixed to the rotating shaft 10 rotates to introduce outside air into the fan cover 8 and the motor case 2 from the opening 2c.

[0009]

By the way, in the rotor 3 used for the electric blower of such a vacuum cleaner, the end 12a of the coil 12 is fixed by spot welding with the end 12a inserted into the slit 16b. Have been.

Accordingly, the high-speed rotation of the rotor 3 (about 40,0
(00 to 50,000 rpm), the end 12a comes into contact with the edge 16c located on the core side of the slit 16b, and the end 12a is easily damaged.

Further, a high bar phenomenon occurs in the commutator 13 due to the centrifugal force caused by the high-speed rotation of the rotor 3, and
6 has risen from the resin cylinder 15, and the problem that the reduction of the carbon brush 5 a of the brush unit 5 has been increased has also arisen.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a commutator motor that can prevent a coil from being damaged and can suppress the occurrence of a hiber phenomenon. I do.

[0013]

Means for Solving the Problems In order to achieve the object, an invention according to claim 1 comprises: a rotating shaft rotatably held by a motor case; a rotor core fixed to a middle portion of the rotating shaft; A resin cylinder fixed near one end of the rotation shaft, a plurality of commutator pieces fixed to the outer periphery of the resin cylinder along the axial direction of the rotation shaft and having slits, and wound around the rotor core; A commutator motor having a rotor having an end connected to the slit and connected to the slit, wherein the rotor is a part of the resin cylinder so as to hold an end of the commutator piece on the rotor core side. The invention is characterized in that a protection portion having a protection slit formed radially outwardly from and having a protection slit continuous with the slit is provided.

[0014] Further, the invention according to claim 2 is characterized in that a part of the protection portion protrudes outward from an outer peripheral surface of the commutator piece.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a commutator motor according to the present invention is applied to an electric blower of a vacuum cleaner and will be described with reference to the drawings. Note that the basic principle of the electric blower is the same as that of the electric blower 1 shown in FIG. 7, and a detailed description thereof will be omitted.

In FIG. 3, reference numeral 21 denotes a rotor constituting a part of a commutator motor applied to an electric blower of a vacuum cleaner, like the rotor 3.

The rotor 21 includes a rotating shaft 22 whose both ends are rotatably held by the bearing 9, a rotor core 23 fixed substantially at the center of the rotating shaft 22, a coil 24 wound around the rotor core 23, And a commutator 25 fixed near the other end of the shaft 22.

As shown in FIGS. 1 and 2A, the commutator 25 has a cylindrical metal tube 26, a resin tube 27 located on the outer periphery of the metal tube 26, and a resin tube 27 on the outer periphery of the resin tube 27. And a plurality of commutator pieces (shells) 28 located along the axial direction of the rotating shaft 22.

The commutator piece 28 is integrally formed with a raised portion 28a on the outer surface of the end located on the rotor core 23 side. As shown in FIG. 1B, a slit 28 into which the end 24a of the coil 24 is inserted is formed in the raised portion 28a.
b is formed. The end 24a is fixed in the slit 28b by spot welding (the number of the coils 24 and the commutator pieces 28 correspond one to one).

The resin cylinder 27 integrally holds the metal cylinder 26 and the plurality of commutator pieces 28 by insert molding when the molten resin as the material is poured into a mold. Also,
A protection portion 27a is formed in the resin tube 27 so as to radially protrude so as to hold the lower end of the commutator piece 28 in the figure (the end on the rotor core 23 side). The protection portion 27a is formed with a protection slit 27b that is continuous with the slit 28b and that holds the end 24a of the coil 24 in cooperation with the slit 28b.

In such a configuration, when power is supplied to the electric blower, the rotor 21 is rotated by the current flowing through the coil 24 and the magnetic force of the stator 4, and at the same time, the impeller 6 fixed to the rotating shaft 22 is moved. The outside air is introduced into the motor case 2 through the opening 2c by rotation.

At this time, even if the rotor 21 rotates at a high speed, the end 24a of each coil 24 is inserted across the slit 28b and the slit 27b.
Is increased, and a stable holding state can be maintained.

The protection portion 2 is softer than the commutator piece 28.
The presence of 7a prevents the end 24a from being damaged by the edge of the slit 27b.

The commutator piece 28 is protected by the protection portion 27a.
Of the commutator 25 due to the centrifugal force caused by the high-speed rotation of the rotor 21, the commutator piece 28 is prevented from floating from the resin tube 27, and the carbon brush Reduction can be reduced.

[0025]

As described above, in the commutator motor according to the first aspect, the rotor is radially outward from a part of the resin cylinder so as to hold the end of the commutator piece on the rotor core side. In addition, by providing a protective portion having a protective slit formed so as to protrude radially and being continuous with the slit, it is possible to prevent the coil from being damaged and to suppress the occurrence of the hyperbar phenomenon.

Further, in the commutator motor according to the present invention, the occurrence of the hiber phenomenon can be further reduced by projecting a part of the protection portion outward from the outer peripheral surface of the commutator piece. It can be further suppressed.

[Brief description of the drawings]

1A and 1B show a commutator motor according to an embodiment of the present invention, in which FIG. 1A is a front view of a commutator in a state where a half thereof is broken around an axis, and FIG. 1B is a front view of the commutator.

FIG. 2A is a cross-sectional view in a direction perpendicular to the axis of the commutator, and FIG. 2B is an enlarged perspective view of a main part.

FIG. 3 is a front view of the rotor in a state where a half of the rotor is broken about an axis.

4A and 4B show a conventional commutator motor, wherein FIG. 4A is a front view of the commutator in a state where a half thereof is broken around an axis, and FIG.
FIG. 4 is a front view of a commutator.

FIG. 5A is a cross-sectional view in a direction perpendicular to the axis of the commutator, and FIG. 5B is an enlarged perspective view of a main part.

FIG. 6 is a front view of the rotor in a state where a half of the rotor is broken about an axis.

FIG. 7 is a front view of the electric blower in a partially omitted state in which a half is broken about the axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Rotor 22 ... Rotating shaft 23 ... Rotor core 24 ... Coil 24a ... End part 25 ... Commutator 27 ... Resin cylinder 27a ... Protective part 27b ... Protective slit 28 ... Commutator piece 28b ... Slit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H613 BB04 BB08 BB14 GA06 GB17 KK03 PP06 PP07 SS05 5H623 AA00 BB07 HH04 JJ03 LL02 LL10

Claims (2)

[Claims] A rotating shaft rotatably held by an electric motor case; a rotor core fixed to an intermediate portion of the rotating shaft; a resin cylinder fixed near one end of the rotating shaft; A rotor having a plurality of commutator pieces fixed along the axial direction to the outer periphery of the resin cylinder and having a slit, and a coil wound around the rotor core and having its end inserted into the slit and connected thereto. In the commutator motor, the rotor is formed so as to protrude radially outward from a part of the resin cylinder so as to hold an end of the commutator piece on the rotor core side, and is a protective slit that is continuous with the slit. A commutator motor, comprising: a protection unit having: 2. The commutator motor according to claim 1, wherein a part of the protection portion projects outwardly from an outer peripheral surface of the commutator piece.