JP3755236B2 - Electric motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a commutator motor used in household electrical equipment and the like.
[0002]
[Prior art]
In recent years, household appliances, particularly vacuum cleaners, have been increasing in output. Along with this, the input, that is, power consumption, has been increasing. Therefore, the current value flowing through the electric motor is also increasing.
[0003]
Under such circumstances, coupled with the pursuit of assemblability, the means of electrical connection of brushes and windings is not by using conventional methods such as soldering or fusing, but by pressure contact between terminals. The method of electrical connection has become the mainstream. However, as described above, the value of the current flowing into the motor is increasing, and therefore, there is an increasing demand for more reliable and safer connection of the contact portion in the electrical connection performed by pressure welding. ing.
[0004]
Hereinafter, a brush-winding connection portion of a conventional electric motor will be described in detail with reference to the drawings. 2 (a) and 2 (b) are diagrams showing a connection state between a brush terminal and a brush terminal to which a winding is connected in a conventional electric motor. In the conventional electric motor, as shown in FIG. 2A, a brush terminal 3 electrically connected to the winding is press-fitted and fixed to a winding frame 2 attached to the field core 1. Further, a spring-like terminal 6 is attached to a brush box 5 to which the carbon brush 4 is attached, which is subjected to several bending processes with one end fixed by a method such as welding.
[0005]
In the field assembly and brush assembly configured as described above, by moving the brush assembly in the direction of the arrow as shown in FIG. With one end fixed to the box as a fulcrum, it comes into contact with the brush terminal fixed to the reel, and the other end abuts against the brush box, increasing the pressure contact force of the spring terminal, The connection is complete.
[0006]
[Problems to be solved by the invention]
However, in the configuration as described above, since only the deformation of the spring terminal between the brush terminal and the brush box is a configuration in which the connection between the brush terminal and the brush box is performed, the winding attached to the field core is not provided. Depending on the dimensions of the frame and the spring terminal, not only the pressure contact state between the brush terminal and the brush box becomes unstable, but also the problem that the worst contact state may occur.
[0007]
In view of the above-described problems of the conventional example, the present invention has a configuration in which the connection portion between the brush terminal and the brush box has two portions instead of the conventional one in connection with the brush terminal. It is an object of the present invention to ensure that electrical connection can be reliably and safely performed even if the dimensions of the winding frame attached to the iron core and the spring terminal change.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, an electric motor according to the present invention includes a winding frame attached to a field core, a brush terminal provided on a convex portion of the winding frame, and the winding having a height lower than that of the convex portion. Rib convex portions provided on the wire frame and spring terminals attached to the brush box, when the brush box is in a fixed state, sandwiched by the spring terminal to press the brush terminal from the vertical direction, Since the spring terminal is supported by the rib convex part and the brush box, even if the dimensions of the winding frame and the spring terminal change so that either one does not contact, Since one of the contact portions is configured so as to hit strongly, the electrical connection between the so-called winding and the brush can be more reliably and safely performed between the brush terminal and the spring terminal. It becomes.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The electric motor of the present invention includes a winding frame attached to a field core, a brush terminal provided on a convex portion of the winding frame, and a rib convex portion provided on the winding frame having a height lower than the convex portion. And a spring terminal attached to the brush box, and when the brush box is in a fixed state, is sandwiched between the spring terminals so as to press the brush terminal from above and below, and at this time, the spring terminal is the rib protrusion And it is the structure supported by the said brush box, and is made into the shape shifted in the horizontal direction from the terminal block so that it can hold down from the up-and-down direction, and a deformation | transformation of a spring terminal between a brush terminal and a winding frame It is set as the shape which provided the rib-shaped protrusion in the winding frame so that the pressing force by can be generated. Also, the pressing force due to the deformation of the spring terminal between the brush terminal and the brush box has a configuration of two points different from the conventional one so that the pressing force can be maintained as in the conventional case.
[0010]
【Example】
The configuration of the present invention will be described with reference to the drawings.
[0011]
FIGS. 1A and 1B are diagrams showing a connection state between a brush of an electric motor and a brush terminal to which a winding is connected in one embodiment of the present invention. In the electric motor of the present invention, as shown in FIG. 1 (a), a brush terminal 3 electrically connected to a winding is press-fitted and fixed to a winding frame 2 attached to a field core 1, and the vertical direction A rib-shaped protrusion 21 is provided so that a pressing force can be generated between the brush terminal and the reel. Further, a spring terminal 6 having one end fixed and subjected to bending several times is attached to a brush box 5 to which the carbon brush 4 is attached by a technique such as welding. In the field assembly and brush assembly configured as described above, the spring terminal fixed to the brush assembly is moved by moving the brush assembly in the direction of the arrow as shown in FIG. With the one end fixed to the brush box as a fulcrum, it comes into contact with the brush terminal fixed to the reel, and furthermore, the flat portion 61 of the spring terminal abuts against the brush box, so that the pressure contact force of the spring terminal increases. In addition to ensuring the connection between the brush terminals, the spring terminal convex portions 62 come into contact with the brush terminals fixed to the winding frame again to electrically connect the brush terminal and the brush box, Between the brush terminal and the brush box, two contact points are connected.
[0012]
【The invention's effect】
As described above, according to the present invention, when connecting between the brush terminal and the brush box, since the connection portion of the brush terminal is not one place as in the prior art, it is configured in two places. Even if the dimensions of the attached winding frame and the spring terminal are changed, it is possible to reliably and safely perform the electrical connection.
[Brief description of the drawings]
FIG. 1A is a diagram showing an uninserted state of a brush assembly according to an embodiment of the present invention. FIG. 1B is a diagram illustrating an inserted state of the brush assembly. FIG. Figure showing the inserted state (b) Figure showing the inserted state of the brush assembly
DESCRIPTION OF SYMBOLS 1 Brush box 2 Reel 3 Brush terminal 4 Carbon brush 5 Brush box 6 Spring-like terminal 21 Rib-shaped protrusion 61 Flat part 62 of spring-like terminal Projection part of spring-like terminal

Claims (1)

A winding frame attached to the field core, a brush terminal provided on the convex portion of the winding frame, a rib convex portion provided on the winding frame having a height lower than the convex portion, and attached to the brush box When the brush box is in a fixed state, the brush terminal is sandwiched between the spring terminals so as to be pressed from above and below, and at this time, the spring terminal is Supported electric motor.

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