JPS6016464Y2 - rotating electric machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotating electric machine having metal crossover wires that are joined together by ultrasonic welding.

2. Description of the Related Art Rectangular aluminum wires are being used as field coils for rotating electric machines, such as small-diameter electric motors used for starting internal combustion engines, in order to reduce weight.

First, this field coil will be explained by showing it in Figs. Aluminum l
, the wire 1at2a is wound a plurality of times.

lb, 2b are connecting wires of these field coils 1 and 2, 1c,
2c is an aluminum wire la, which prevents a short circuit between the aluminum wires 1a, 2a and connecting wires 1b, 2.
Insulating paper that also prevents short circuit with b, ld and 2d are crossover wires 1
insulating tape holding b, 2b and insulating paper 1c, 2c;
A is a joint where the connecting wires 1b and 2b are superposed and joined by ultrasonic welding.

Here, ultrasonic welding for joining the connecting wires 1b and 2b of the field coils 1 and 2 will be explained with reference to FIGS. 4 and 5.

5 is an ultrasonic welding machine, 6 is a horn that amplifies ultrasonic vibrations from an ultrasonic vibration source (not shown), and 7 is a tip installed at the tip of this horn 6, which is turned in the direction of arrow A. As shown, it vibrates due to ultrasonic vibration.

Incidentally, the tip 7 and the horn 6 can be moved up and down in the direction of the arrow, and are pressed downward with an appropriate pressure p.

8 is an anvil fixed opposite to this chip 7.

A plurality of square bell-shaped protrusions 7a*8a as shown in FIG. 6 are formed on each of the opposing end surfaces of the anvil 8 and the tip 7, and the anvil 8 and the tip 7 are made of quench-hardened steel. has been done.

Now, the welding is performed by placing the field coil 1 on the end face of the anvil 8.
The connecting wires 1b and 2b of field coils 1 and 2 are superimposed and installed, and then the tip 7 is moved downward in the direction of the arrow through the horn 6, and the connecting wires 1b and 2b of the field coils 1 and 2 are attached to the anvil by the tip 7. 8 with pressure p and the tip 7 and the protrusion of the anvil 8? Insert the wires a and 8a into the opposite surfaces of the connecting wires 1b and 2b.

Thus, the tip 7 and the anvil 8 connect the connecting wires 1b and 2.
With pressure applied to joint part A of b, ultrasonic vibration is applied to the tip 7 through the horn 6, and the tip 7 is vibrated in the direction of arrow A to rub the joint surfaces of the connecting wires lb and 2b, thereby connecting the connecting wire 1.
b and 2b can be joined at the joint part A.

Here, in order to increase the joint strength in ultrasonic welding, it is important to increase the frictional force of the joint surfaces and the pressure p at the joint A.

Is that why there is a protrusion on tip 7 and anvil 8 in this example? A large frictional force is obtained by forming a plurality of a and 8a.

However, when the connecting wires 1b and 2b are completely joined, on both sides of the joint, a rectangular pot-shaped recess 1e*2e extends over the entire width of the connecting wires 1b and 2b, as shown in FIGS. 3 and 5. Aluminum wire 1at2a
, that is, the crossover wire 1b.

Coupled with the relatively thin thickness of 2b, the crossover wires 1b, 2
The thickness of each of the roots If and 2f of the joint part A of b is extremely thin, and as a result, the roots If and 2f are in a state where they are very easy to break.

This means that the joint A of the field coils 1 and 2 is easily broken, which means that the joint A often breaks at the base 1f or 2f during the work of assembling the field coils 1 and 2 to the motor. It was an accidental shooting.

That is, the number of field coils 1, 2 corresponds to the number of poles, for example, in the case of a four-pole motor, there are four field coils 1, 2. 2.
3. 4 are connected by joining the respective crossover wires lb, 2b, 3b, and 4b, and as shown in FIG.
gt 4g and 4 pole tips (not shown)
It is placed by being pressed by.

However, by winding field coils 1.2 and 3.4,
Although it is in a flat state at the stage of connecting it, in order to arrange it on the yoke 9, as shown in FIG.
If aw 2 aw 3a, 4a are plastically deformed into a small-diameter annular shape, since each connecting wire 1b, 2b, 3b, 4b is short, the connecting portion A of connecting wires 1b, 2b and connecting wire 3b,
4b joints B, especially the roots 1f, 2f, 3f, and 4f, local stress will be applied to each of the roots 1f, 2f, 3f, and 4f, resulting in fatal damage such as breakage and disconnection at these thin roots 1f, 2f, 3f, and 4f. It was a serious accident.

This inconvenience occurs even with metals other than aluminum materials, such as steel, and even when used for purposes other than field coils, if bending or twisting is required, bending may occur as well. This leads to the following.

This invention provides a rotating electrical machine having superior interconnected metal wires that eliminates the above-mentioned drawbacks.

To explain the embodiment below, first, in FIG. 8, protrusions 7a and 8a formed on the tip 7 and anvil 8 that bite into the anti-junction parts of the connecting wires 1b and 2b of the field coils 1 and 2, respectively. The shape is not perpendicular to the bending and twisting direction of the crossover wire 1b92b.

Therefore, the recesses 1e and 2e formed at the opposite joint portions of the connecting wires 1b and 2b become V-shaped communication grooves, and at the same time, gentle tapers lh and 2h are formed at both ends of the communication grooves.

Further, as shown in FIG. 9, it is also possible to form a V-shaped communication groove and tapers lh and 2h in an oblique direction.

By doing so, each crossover 1b. 2b joint A
The thickness in the direction of bending and twisting can be maintained at approximately the original (current) thickness of the connecting wires 1b and 2b, so the strength against bending and twisting of the joint A can be significantly improved, and breakage can be avoided. .

Therefore, even if the connecting wires 1b, 2b, 3b, and 4b are plastically deformed into a small-diameter annular shape after the connection of the field coils 1, 2, and 3.4 is completed by joining the crossover wires 1b, 2b, 3b, and 4b, the joints A and B will not bend. Since the torsional strength has been significantly improved, there is no possibility that the roots if, 2f, 3f, and 4f will break and break due to local stress due to bending, etc., so there is no need to be careful about bending. Moreover, a highly reliable field coil and an electric motor can be obtained.

Here, the tip 7 and the protrusion 7a of the anvil 8.

Although the shape of 8a is formed by arranging the V-shape or the V-shape as a needle, even if this is done, the connecting wires 1b, 2b
Since the pressure p or the vibration frequency is determined so that the frictional force on the bonding surfaces does not decrease, sufficient bonding strength can be obtained.

Note that this invention is not limited to the examples, but includes various embodiments, and is further applicable to ultrasonic welding used in various technical fields.

For example, a protrusion? The shapes of a and 8a, the formation positions of recesses 1e and 2e, the type of material, etc. can be changed.

As mentioned above, this invention has metal crossover wires that can be mutually polymerized and joined by ultrasonic welding.
By providing a recess that is formed at the joint of the crossover wire and is not perpendicular to the bending or twisting direction of the crossover wire, the thickness of the crossover wire can be maintained at the current level, and the strength of the joint can therefore be significantly improved. Effects can be obtained.

[Brief explanation of drawings]

Figure 1 is a front view showing the field coil, Figure 2 is Figure 1 -
■A sectional view of the joint A taken along the line, Figure 3 is an enlarged front view of the joint A, Figure 4 is a perspective view of the ultrasonic welding machine, and Figure 5 is the main part taken along the line V'-V in Figure 4. Cross-sectional view, Figure 6 shows protrusion 7
A*8a perspective view, Fig. 7 is a partial sectional view of the electric motor, Fig. 8
The figure is an enlarged front view of joint A showing one embodiment of this invention.
FIG. 9 is an enlarged front view of a joint A showing another embodiment. In the figure, 1 to 4 are field coils, 1a to 4a are aluminum wires, 1b to 4b are crossover wires, 1c to 4c, 1g to 4g
is insulating paper, ld and 2d are insulating disoles, 1e to 4e are four parts, 1f to 4f are bases, 5 is an ultrasonic welding machine, 6 is a horn,
7 is a chip, 7a. 8a is a projection, 8 is an anvil, 9 is a yoke, and A and B are joint parts. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a rotating electrical machine having metal crossover wires that can be superimposed on each other and joined by ultrasonic welding, four parts are provided at the joints of the crossover wires and are not orthogonal to the bending, twisting direction, etc. of the crossover wires. A rotating electrical machine characterized by the following.