JPS6188745A - How to connect commutator pieces and armature coils - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method of connecting commutator pieces and armature coils, and is particularly used in starting motors, etc., and provides a commutator that exhibits excellent connection strength at high temperatures. Concerning the method of connecting the piece and the electric seed coil.

[Background of the invention]

Conventional commutator pieces and armature coils have been connected by various methods such as soldering, electric welding, and ultrasonic welding. However, since the connection is generally made by heating, the molding resin between the commutator pieces deteriorates due to heat.
Since the mechanical strength of the resin is reduced, the commutator pieces float up when the armature rotates at high speed, and the commutator pieces are scattered, making it impossible to rotate.

Also, a method for connecting without heating is disclosed in Japanese Patent Application Laid-Open No. 54-131705.
This method is known from Japanese Patent Publication No. 57-25137. In this example, the coil is plastically deformed in the riser groove,
The tension is used to connect, but if the hardness of the riser part is lower than the hardness of the coil, even if a strong pressure is applied, sufficient contact with the riser part and contact between the lower coil and the upper coil will not be achieved. If the pressing force is further increased, cracks may occur in the insulating molding resin, causing problems such as the scattering of flow particles from the coil riser when the armature rotates at high speed. Furthermore, problems such as the coil extending in the axial direction due to pressurization may tear the insulating paper in the armature core slot, resulting in poor insulation. In this way, if sufficient consideration is not given to the hardness of the coil, the lamination direction of the armature core, the pressurizing method, etc., there is a risk of product trouble occurring.[Object of the Invention] The purpose of the present invention is to The object of the present invention is to provide a method for connecting commutator pieces and armature coils with excellent productivity.

[Summary of the invention]

The coils inserted into the armature coil mounting grooves of the commutator pieces are fixed by cold working, and the lower coil and the lower coil have their contacting parts made flat in advance. Insert it into the mounting groove and apply pressure from above to plastically deform it.
After filling the groove, the opening edge of the mounting groove is plastically deformed under pressure to fix both coils under pressure.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

The armature 1 includes a rotating shaft 2 disposed at the center, an i & child core 3 stacked and fitted on the rotating shaft, and an insulating material in a slot 31 formed on the outer periphery of the armature core. Arranged through! It consists of Isogo coil 4. On the other hand, the armature core 3
A commutator 5 fixed to the rotating shaft 2 is juxtaposed on the side surface of the rotary shaft 2, and the end portion of the riser portion 51KPM child coil 4 is electrically and mechanically bonded and fixed.

For the armature l, first press-fit the armature core 3 onto the rotating shaft 2,
Armature coils 4, which have been previously formed to have a predetermined substantially O-shaped cross section, are inserted into a plurality of slots 31 of this iron core 3 through insulators 32 from the side opposite to the commutator, as many as the number of slots 31. Next, the coil 4 protruding toward the commutator side is molded according to the wiring diagram, and then the commutator 5 is inserted into the groove 52 of the riser 51 while determining the dimensional positions of the slot 31 and commutator piece 54 and press-fitting them. do.

In this case, generally the center side of the rotating shaft 2 is the lower coil 41,
The outer circumferential side is called the upper coil 41A, and the relationship between the width W of the groove 520 and the width B of the coil 4 is set so that a gap of 0.1 to 0.3 (w) is generated, and the commutator 5 is press-fitted. At this time, the coil 4 smoothly enters the groove 52.

Next, from the upper coil 41A side toward the center of the rotating shaft 4, the third
As shown in the figure, pressure is applied to all the grooves at the same time using a pressurizer 61 slightly pinched from @W so that even pressure is applied to the coil 4, and the coil 41.4LA is plastically deformed into the groove 52 to fill it. After confirming that the groove is sufficiently filled and deformed, the opening edge 55 of the groove 52 is evenly pressurized from the outer periphery of the riser 51 using another pressurizer 62 as shown in FIG. At this time, the projecting portions 41B and 41C of the upper and lower coils protrude outward in the p-axis direction from the riser 51! 63A, pressurize the riser to form the claw part 53, and then coil 4.
1.4 Total prevention of LA floating.

Here, the cross-sectional shape of the coil used for this pressurized connection is as shown in FIG. This is absolutely necessary because if the coils are pressurized from the outer periphery of the riser 51, slippage will occur between the coils, resulting in an uneven load and making it difficult to fill the groove with the coils. Of course, the above problem can be solved by reducing the gap between the groove 52 and the coil 41.4LA, but this is not practical in terms of productivity because it requires improvement in the accuracy of the coil forming dimensions, groove width, and angular dimensions.

After the coil 41.41A is pressurized and plastically deformed in the groove 52 in this way, if the relationship between the height H between the upper coil 41A and the outer periphery of the riser 51 and the groove width W is H and 1/2W, the fourth
As shown in the figure, pressurize the groove opening ends at two or more locations oppositely or alternately,
Cover and fix on top of the coil 41A. However, H>
In the case of 1/2W, if pressure is applied to the claws 53 facing each other, the claws 53 overlap, making it impossible to reliably suppress the end face of the coil.In order to increase contact resistance, it is not possible to suppress the coil by applying pressure to two or more pieces alternately. can.

Since the coil 4 used for this connection is deformed without heating and the commutator pieces are connected, it is necessary to remove the insulation coating only at the connection portion before inserting it into the groove. In addition, if the lubricant during the punching process adheres to the groove, it becomes an insulating film, so it is important to completely remove the lubricant in this method of connecting with tension.Furthermore, the hardness of the coil 4 is soft as a whole. However, when inserted into the slot 31, the coil deforms due to the insertion force and bends, making it difficult to insert and reducing productivity. Therefore, the coil maintains the required hardness, and the riser is made by locally softening only the connection part. Even if the pressure applied to the parts is low, plastic deformation is likely to occur, and unreasonable force is not applied to the synthetic resin 55 between the commutator pieces 54. By the way, the hardness of coil 4 is H'/10.
0 or more, but the connection is annealed by high-frequency heating and 1
(When softening to about V50, place a heat stopper at a predetermined position from the tip of the coil insertion part, and at the same time soften only the main part, the insulation coating will also be burned and removed. In this way, the hardness of the riser part is HV 100 to 110. By significantly softening the hardness of the coil pressurized portion, a highly reliable bond can be obtained.

Next, a method for plastically deforming the coils 41 and 41A by applying pressure to the groove 52 will be explained. This bonding fl-Ni method is mechanically applied to a certain fixed amount when variations occur in the depth and width of the grooves and the cross-sectional dimensions of the coils. When the member is plastically deformed by pressure dimension, a difference occurs in the amount of deformation of the member, making it difficult to connect each groove with uniform tension force. For this reason, for example, by applying hydraulic pressure to the coil 41.4LA' with the same pressure for each groove and plastically deforming it, the tension force is constant and connection without variation can be achieved.

Here, if you connect the coils with pressure, the coils will be 41.41
A is slot 3 because it is pushed in the direction of least resistance by pressure force.
The coil inside 1 also moves to the side opposite to the commutator. For this reason, the stacking direction of the armature core 3 is such that the warp direction of the press punching is on the opposite commutator side, and the coil is deformed at the coil end on the opposite commutator side and at the coil protrusion 9 at the tip of the riser as described above. By pressurizing some of the coils in the riser with the jigs 63 and 63A, the coils are prevented from deforming due to pressure, and sufficient tension is obtained at the pressurized part. Care has been taken to ensure that insulation failure does not occur even if the product is moved and deformed.

In the armature l in which the coils are connected with such tension, the commutator 5 is not heated, so there is no deterioration of the synthetic resin between the commutator pieces, and even at high speed rotation, the coil 41.
41A can be completely prevented from floating and scattering.

For example, the rotation speed of conventional solder connection type is 20,000.
~22. While OOORPM was the limit, the example of the present invention had a limit of 30,000 to 35. We were able to manufacture something that withstood up to OOORPM and confirmed its effectiveness.

Furthermore, according to this embodiment, the tip of the armature coil is softened and inserted into the groove of the commutator piece riser, and the cross-sectional shape, hardness difference with the riser, coil deformation prevention jig, and core lamination direction are taken into consideration. Since the method of applying pressure with evenly distributed load and connecting with tension force prevents the strength of the synthetic resin between the commutator pieces from decreasing due to heat, and because all grooves can be machined at the same time, it is possible to machine the connecting blades in a shorter time than before. This has the effect of providing a connection method that is easy to manufacture, inexpensive, and highly reliable.

In the above embodiment, the explanation is centered on the case where all ends of the riser armature coils are connected, but the same can be said in the case of a riserless case.

〔Effect of the invention〕

As described above, according to the present invention, a method for connecting commutator pieces and armature coils that is excellent in high-speed rotation performance and productivity can be easily provided.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional view of the main part of the iE state, FIG. 2 is a sectional view taken along the line II-I in FIG. 4 is an enlarged view of the main parts in the second welding step, FIG. 5 is a top view of FIG. 4, FIG. 6 is an enlarged view of the main parts in the second welding step in another embodiment, and FIG. 7 is a top view of FIG. 6;

Claims (1)

[Claims] 1. A lower coil and an upper coil whose contact portions are made flat in advance, in a coil that is inserted into an armature coil mounting groove of a commutator piece and fixed by cold working, Both coils are inserted into the mounting groove, and pressurized from above to plastically deform the groove to fill the groove, and then the opening edge of the mounting groove is plastically deformed to fix the coils under pressure. A method of connecting commutator pieces and armature coils featuring: 2. A method for connecting a commutator piece and an armature coil according to claim 1, wherein opposing portions of the opening edges of the mounting groove are simultaneously subjected to plastic deformation under pressure. 3. A method for connecting a commutator piece and an armature coil as set forth in claim 1, characterized in that portions of the opening edges of the mounting grooves that are shifted in the axial direction are simultaneously subjected to plastic deformation under pressure. 4. A method for connecting a commutator piece and an armature coil according to claims 1 to 3, characterized in that the hardness of the coil portion to be fixed is lower than that of the commutator piece. 5. In claims 1 to 4, if the distance from the upper coil end face of the plastically deformed in-groove coil to the riser outer periphery is greater than 1/2 of the groove width, plastic deformation of the opening edge is not required. A method for connecting a commutator piece and an armature coil, characterized in that the claws are provided in at least two places alternately and in at least two places facing each other if the claws are smaller than 1/2 so that the claws do not overlap.