JPS635413Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a coupling structure of a stator of a motor.

(Prior Art) Generally, in electrical devices such as stepping motors and induction motors, cases, stator cores, etc. are made by pressing or drawing thin metal plates. Spot welding is often used as a structure for bonding and fixing these cases, stator cores, mounting flange plates, side plates, etc. to each other at their flat surfaces.

However, due to the process, these parts are often plated before being spot welded.
In the case of plated parts, it is difficult to perform spot welding, and even if it appears to be successfully welded, there are problems such as the strength of the welded part, discoloration of the welded part, and the possibility of destruction of the plated layer. For this reason, these parts are sometimes plated in the assembled state after spot welding, but even in this case, the plating does not reach the overlapping part of the two parts sufficiently, and the processing liquid that has penetrated into the gap may Since it is difficult to remove completely, problems arise such as it is likely to cause rust and corrosion later on.

Therefore, other fixing structures such as mechanical rivet caulking or screw fixing are possible, but protrusions occur on surfaces that should be flat, such as the flange surface, which disturbs the magnetic properties and makes the rotational characteristics of the motor unstable. There are still many problems in terms of performance and assembly work, such as the need for separate parts for fixation, which complicates the work.

(Purpose of the invention) The purpose of the invention is to provide a joining structure for metal plate members that solves the above-mentioned problems regarding the conventional fixing structure of metal plate members when assembling electrical equipment parts, etc. It is something.

(Structure of the invention) In order to achieve the above object, the present invention provides a coupling structure between a case of a stator which is excited by a coil winding and rotates a rotor and another metal plate member or two cores of the stator. A protruding piece with broken surfaces on both sides is bent on either the stator and the metal plate member or the two cores, and a cutout hole is provided in the other of them, and the protrusion piece is inserted into the cutout hole. are fitted together, and a part of the fractured surface is rolled and coated on the other surface.

(Example) An example of the present invention will be described with reference to the drawings. In FIG. 1, metal plates 1 and 2 overlapped to be bonded and fixed to each other, each having a protruding piece 1a formed by bending with a press and a cutout hole 2a punched out, and broken by a press on both sides. This projecting piece 1a having a surface is fitted into the cutout hole 2a so that the head 1b of the projecting piece 1a projects upward from the surface 2b of the metal plate 2.

The head 1b of the protruding piece 1a that protrudes in this way,
When pressed in the direction of the arrow with the press die 3 having an obtuse-angled apex as shown by the two-dot chain line in FIG.
As shown in FIG. 2, a portion of the head 1b is rolled and coated on the surface 2b of the metal plate 2. Therefore, the metal plate 2 is strongly sandwiched between the contact surface 1c of the protruding piece 1 with the surface 2b of the metal plate and the contact surface 1d of the metal plate 1 with the metal plate 2, so that the metal The plate 1 and the metal plate 2 do not shift from each other in the vertical direction. In addition, since the contact surface 1e of the protruding piece 1 with the peripheral wall of the cutout hole 2a is strongly pressed against the peripheral wall of the cutout hole 2a, the metal plates 1 and 2 are displaced from each other in the left-right direction. Never.
As a result, the metal plate 1 and the metal plate 2 are firmly connected to each other without shifting in either the vertical direction or the horizontal direction. In particular, the contact surfaces 1c, 1e
Since each of the peripheral walls of the cutout hole 2a is a broken surface, the fixing strength is extremely high.

Incidentally, FIG. 2 is a sectional view seen from the − direction of FIG. 1 after pressing, and shows the cross section after being pressed by the mold 3. At this time, the protruding piece 1
Even after pressing, a protrudes from the surface 2b of the metal plate 2 by a distance h, but this dimension h is extremely small compared to the height of the screw head, etc. It is safe to assume that the top is almost flat.

Next, a structure for joining and fixing a press-formed part in a flat part of an electrical equipment part such as a motor, to which such a joining structure of metal plate members is applied, will be described.

As a first example, FIG. 3 shows a fixing structure between a case 4 and a mounting plate 5, which constitute a part of a stator in a stepping motor. The cup-shaped case 4 has a plurality of teeth (pole teeth) 4a formed by vertically bending a part of the bottom surface, and rectangular holes 4b created by forming the teeth 4a. have. Note that the notch 4c is provided for drawing out the electric wire. On the mounting plate 5, protruding pieces 5a similar to the protruding pieces 1a in FIG. 1 are formed by bending at several places. This protruding piece 5a is a rectangular hole 4b.
The case 4 and the mounting plate 5 are fixed by being pressed with the mold 3 in the fitted state as described above.

In the case of this fixed structure, there is no need to newly provide a cutout hole in the case 4 to fit the protruding piece 5a,
The rectangular hole 4b created by forming the teeth 4a can be used as a cutout hole, which is advantageous in terms of the work process. Moreover, since the rectangular holes 4b are provided on the bottom surface of the case 4 at regular intervals all around the circumference, the positional relationship between the case 4 and the mounting plate 5 can be set freely.
This can be said to be advantageous from a design standpoint.

From the above, it can be said that it is extremely preferable to apply the metal plate member joining structure according to the present invention as a fixing structure such as the case 4 and the mounting plate 5 in the stepping motor shown in FIG.

As a second example, FIG. 4 shows a fixing structure between cores forming part of a stator.
The core 6 and the core 7 each have a plurality of teeth 6a and 7a formed by vertically bending from the peripheral edge of the inner circle. Further, on the flat surface of the core 6, several protruding pieces 6b similar to the protruding piece 1a in FIG. . Then, with these cores 6 and 7 stacked one on top of the other, the protruding piece 6b is pressed as described above, so that the two are firmly fixed to each other.

An example of Fig. 3 is fixation between the side plate 8 on a flat plate and the case 4 (see Fig. 3) explained in the first example, but in this case as well, the fixation is done using the same structure as in the first example. Is possible.

The locations to which the three examples described above are applied are illustrated in FIG. 5, which is a sectional view of the entire stepping motor. Part A is the first example, part B is the second example. Part C shows the third example. In addition, 9 is the shaft, 1
0 is a bearing, 11 is a rotor, 12 is a winding part, 13
14 is a resin bobbin, 14 is a bushing, 15 is an electric wire, 16 is a terminal portion, and the stator is composed of a case 4, a core 6, and a core 7.

(Effects of the invention) Since the present invention is constructed as described above, it has the following effects.

Since special parts and special processing are not required for fixing, integral processing using a press is possible.

Although the structure is simple, the fixing strength between the two members is high.

Since there are almost no protrusions on the flange surface, which should be flat, the magnetic characteristics are not disturbed, and the rotational characteristics of the motor are stabilized.

There is no need for special equipment like spot welding, and there is no discoloration or destruction of the plating layer.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the state of the joint of metal plates before pressing, Figure 2 is a cross-sectional view of Figure 1 viewed from the negative direction, and Figures 3 and 4. 5 is a perspective view showing an example of application of the present invention, and FIG. 5 is a sectional view of a motor showing an example of application of the invention. 1...Metal plate, 1a, 5a, 6a...Protruding piece,
1b...head, 2...metal plate, 2a, 4b, 7b
...Cutout hole, 2b...Surface, 4...Case, 5...
...Mounting plate, 6,7...Core, 8...Side plate, 12...
...Winding section.

Claims (1)

[Scope of utility model registration request] In a structure in which a case of a stator that is excited by a coil winding to rotate a rotor and another metal plate member or two cores of the stator are coupled, which of the stator and the metal plate member or the two cores is connected to each other. A protruding piece with broken surfaces on both sides is bent on one side, a cut-out hole is provided in the other of the protruding pieces, and the protruding piece is fitted into the cut-out hole,
A stator coupling structure in a motor, characterized in that a part of the fractured surface is rolled and coated on the other surface.