JP2666464B2 - Commutator motor shaft insulation - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commutator motor used for an electric blower for a vacuum cleaner, a juicer mixer, and the like, and particularly to an insulation of a shaft thereof.

2. Description of the Related Art In recent years, commutator motors have been improved in performance and quality, and among them, a commutator motor having high insulation performance has been demanded. For a rotor shaft insulation of a conventional commutator motor, a material obtained by performing a varnish treatment on paper is used.

Hereinafter, an example of the above-described conventional rotor shaft insulation will be described with reference to the drawings.

FIG. 5, FIG. 6, FIG. 7, and FIG. 8 show shaft insulation of a conventional rotor. In FIG. 6, reference numeral 1 denotes a motor shaft. Reference numeral 2 denotes a rotor core (hereinafter abbreviated as an iron core), which is press-fitted into the shaft 1. Reference numeral 3 denotes a coil wound around a slot of the iron core 2. Reference numeral 4 denotes a commutator to which the winding ends of the coil 3 are connected. Reference numeral 5 denotes an insulator for insulation between the iron core and the coil 3, which is sometimes attached before the coil 3 is wound. Reference numeral 6 denotes a shaft insulation between the shaft 1 and the coil 3 and an insulator 5
Is mounted and before the coil 3 is wound. In FIG. 5, reference numeral 7 denotes a slot of the iron core 2 and the coil 3.
Slot insulation for insulation with

First, the core 2 is press-fitted into the shaft 1, the insulator 5 is mounted, the shaft insulation 6 is mounted, and the slot insulation 7 is inserted into the slot of the core 2, and the commutator 4 is press-fitted into the shaft 1. The winding is wound on the iron core 2, and the winding end of the coil 3 is connected to the commutator 4.

However, in the above-described configuration, the insulator 5 is mounted along the shaft 1 and then the shaft insulation 6 is mounted along the shaft 1. Is deformed or has burrs, a gap is formed in the contact surface between the insulator 5 and the shaft insulation 6, and the insulation between the shaft 1 and the coil 3 deteriorates. There is also a method of mounting the shaft insulation 6 first and then mounting the insulator 5.
When the insulator 5 is mounted on the outer diameter of the shaft insulator 6, the insulator 5 is caught on the end face of the shaft insulation 6, and the mounting becomes difficult. Further, when inserting the slot insulator 7 into the slot portion of the iron core 2, there is a problem that the insulator 5 floats from the end face of the iron core and the insulator 5 must be mounted again.

In addition, since the surfaces of the insulator 5 and the shaft insulation 6 are smooth, there are many contact portions with the coil 3, which causes deterioration of heat radiation of the coil 3 and increases temperature.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a commutator motor capable of improving workability in automatic assembly, improving insulation performance, and reducing a rise in temperature of a winding.

Means for Solving the Problems In order to solve the above problems, in the shaft insulation of the present invention, at least the armature shaft and the iron core are integrally molded by molding with resin to form a shaft insulation, and Is formed in a tapered shape that becomes thicker toward the iron core side, and grooves having irregularities are provided along the axial thrust direction on the outer diameter of the cylindrical portion.

The present invention can improve the insulation performance of the shaft and the iron core by integrally molding the resin and the resin so as to be located between the shaft and the iron core by the above-described configuration, and form the cylindrical portion into a tapered shape. By doing so, the workability at the time of inserting the insulator can be improved, and the insulation at the contact portion between the shaft insulation and the insulator can be improved. Further, the portion where the coil is in contact is reduced as much as possible by the uneven portion formed on the outer diameter of the cylindrical portion of the shaft insulation, and the temperature rise of the winding can be reduced.

Embodiment A shaft insulation according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state after winding in an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a motor shaft.
Reference numeral 2 denotes an iron core of the rotor, which is integrally molded with the shaft 1 with resin. Reference numeral 3 denotes a coil wound around a slot of the iron core 2. Reference numeral 4 denotes a commutator to which the ends of the coil 3 are connected. Reference numeral 5 denotes an insulator between the iron core 2 and the coil 3.
Reference numeral 11 denotes shaft insulation made of resin for the shaft 1, the iron core 2, and the coil 3. FIG. 2 shows the shape of the cylindrical part of the shaft insulation 11 in the first embodiment of the present invention. I have.

First, the shaft 1 and the iron core 2 are integrally molded with resin together with the shaft insulation 11, the insulator 5 is mounted, the slot insulation 7 is inserted into the slot of the iron core 2, and the commutator 4 is mounted on the shaft 1.
The coil 3 is connected to the commutator 4 by winding. When installing the insulator 5,
Since the shaft insulation 11 is tapered, it can be mounted on the shaft insulation 11 without being caught. In addition, since the shaft insulation 11 is tapered, the insulator 5 is press-fitted on the iron core side, so that the insulation performance between the coil 3 and the iron core 2 can be improved.

As described above, according to the present embodiment, by mounting the shaft insulation in a tapered shape with resin, the insulator 5 can be easily mounted by automatic assembly, and the gap between the outer diameter of the shaft insulation 11 and the inner diameter of the insulator 5 is eliminated. Therefore, insulation performance can be improved.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a shaft-insulated cylindrical portion according to a second embodiment of the present invention. In FIG. 3, reference numeral 22 denotes a shaft insulation integrally formed with the shaft 1, which has the same structure as that of FIG. The difference from the configuration of FIG. 1 is that grooves 23 made of irregularities are formed in the axial direction on the outer diameter side of the cylindrical portion of the shaft insulation 22 so that the contact area with the coil 3 is reduced. As described above, the shaft insulation with the convex portion provided on the outer diameter side of the cylindrical portion is integrally formed with the shaft, so that the contact with the coil is limited to the convex portion and the contact area can be greatly reduced, and the temperature of the winding rises Can be kept low. In the present embodiment, the concave and convex grooves 23 on the outer diameter side of the cylindrical portion have a continuous shape, but may have an intermittent shape.

Effect of the Invention As described above, the present invention insulates the shaft and the iron core by integrally molding at least the shaft and the iron core with the resin to form the shaft insulation, and the outer cylindrical portion of the shaft insulating core. By forming the taper into a tapered shape that becomes thicker toward the iron core, it is possible to improve the workability of inserting the insulator in automatic assembly, and to improve the insulation performance by eliminating the gap between the contact surface with the insulator. Can be. In addition, by providing an uneven groove on the outer diameter side of the cylindrical portion of the shaft insulation and reducing the contact portion with the coil, the temperature rise of the electric motor can be reduced, and a more reliable electric motor can be provided. . Further, if the temperature rise is made the same, it is possible to provide a motor with higher output or lower cost.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a state after winding of a rotor according to a first embodiment of the present invention, FIG. 2 is a perspective view of a shaft insulating tubular portion according to the first embodiment of the present invention, FIG. 3 is a perspective view of a shaft-insulated cylindrical portion according to a second embodiment of the present invention, FIG. 4 is a plan view seen from the direction A in FIG. 3, FIG. FIG. 1 is a half sectional view showing a state after winding of a rotor in a conventional embodiment, FIG. 7 is a perspective view of an insulator in a conventional embodiment, and FIG. 8 is a perspective view of shaft insulation in a conventional embodiment. It is. 1 ... shaft, 2 ... iron core, 3 ... coil, 5 ... end insulator, 11 ... shaft insulation, 23 ... concave and convex grooves on the outer diameter side of the cylindrical portion.

Claims (2)

(57) [Claims] A shaft formed by integrally molding at least a portion between a rotor core and a shaft with a resin in order to insulate a rotor core of an electric motor and an armature winding wound on the rotor core from the shaft. In the insulation, the shaft insulation of a commutator motor having a tapered shape in which a cylindrical portion outside the rotor core of the shaft insulation becomes thicker toward the iron core. 2. The shaft insulation of a commutator motor according to claim 1, wherein an uneven groove is provided along the axial thrust direction on the outer diameter of the cylindrical portion outside the rotor core of the shaft insulation.