JPH0522890A - Steel plate frame for motor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a steel plate frame for electric motors that is of high quality and that can easily stabilize the work including the next process. [Structure] A lead wire rising from the stator coil end is drawn out of the frame 1 through a lead wire hole 3. Since the edge portion is formed into a curved shape by the burring 2, the lead wire is not damaged at all. Since the punching bur 2a is also positioned on the outer peripheral side of the lead wire hole 3 by the burring process, it does not come into contact with the lead wire and effectively acts as a protection state of the lead wire. Further, the burring 2 can be used to accurately position the accessory parts such as the terminal box, and the positional deviation does not occur until the fixing work is completed.

Description

Detailed Description of the Invention

 [Object of the Invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to manufacture a flat plate made of a steel plate into a cylindrical so-called pipe shape and use it as a steel plate frame for an electric motor.

[0002]

2. Description of the Related Art A conventional technique relating to the present invention will be described with reference to the drawings. 5 (a) is a conventional cylindrical frame made of steel plate, FIG. 5 (b) is a side view thereof, and FIG. 5 (c) is a sectional view taken along the line Y-Y of the drawing showing the lead wire extraction hole portion. FIG.

In the prior art, it is almost the case that the lead wire hole 3 is punched out before it is formed into a cylindrical shape, that is, when it has a flat plate shape. In rare cases, it may be punched after being formed into a cylindrical shape, but in this case, it is punched from the frame outer circumference 1a toward the frame inner circumference 1b. In any case, the lead wire hole 3 is used as it is in the punched state.

[0004]

The problems of the prior art will be described. Firstly, the occurrence of punching burrs 2a in FIG. 5 (c) can be mentioned. The punching bur 2a is unavoidable because it always occurs in plastic working using a press or the like. This punching burr 2a
Causes damage to the insulation coating of the lead wire taken out from the stator inside the frame, which may cause an accident such as insulation deterioration and short circuit (burnout). In some cases, there is a risk of serious accidents such as breakage of lead wires.

Secondly, a terminal box or the like for accommodating the lead wire and connecting the electric power for driving the motor is installed around the lead wire hole 3, but the frame outer circumference 1a of the frame 1 and the lead wire hole 3 are the same. Since it is on a flat surface (that is, there is no protrusion at all), it is necessary to give sufficient consideration to the alignment when positioning the terminal box in the lead hole 3, and there is a positional deviation until the fixing work of the terminal box is completed. There is a problem that it is easy to do.
When the positional displacement occurs, the lead wire hole 3 becomes small as a result, and when the lead wire is inserted, the lead wire may be easily damaged or may not be inserted. In addition, uneven quality occurs in appearance.

There is also a method in which the lead wire hole 3 is punched out at the time of the flat plate shape, and the punching bur 2a is controlled so that it is always on the frame outer periphery 1a side, and then roll molding is performed, but there is a management error and the punching is started. 2 punching burrs on the side
Although there is no a, sharpening of the edge is unavoidable in terms of plastic working, and in any case, it is not preferable in terms of lead wire protection measures. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a steel plate frame for an electric motor, which is of high quality and can easily stabilize the work including the next step.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a flat plate made of a steel plate cut into a predetermined size is roll-formed into a cylindrical shape, and the butted portion is welded to the lead wire from the inner peripheral side toward the outer peripheral side. Punching out the prepared hole for the take-out hole,
Further, the steel plate frame for electric motors is characterized in that it is subjected to so-called burring processing so that the entire circumference of the end portion of the lead wire extracting pilot hole in the same direction travels to the outer peripheral surface of the cylindrical frame.

[0008]

As shown in FIG. 3 (a), the stator coil end 4
The lead wire 5 rising from a is drawn out of the frame through the lead wire hole 3. At this time, FIG.
As shown in (c), since the edge portion is formed into a curved shape by the burring 2, the lead wire 5 is not damaged at all. Since the punching bur 2a shown in FIG. 2b is also located on the outer peripheral side of the lead wire hole 3 by burring as shown in FIG. 2 (c), contact with the lead wire is lost, and the lead wire is protected. It will act effectively as a state.

As shown in FIG. 4 (a), the burring 2 is used to accurately position the accessory parts such as the terminal box 6,
Further, it works so that the positional deviation does not occur until the fixing work is completed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 (a) to 1 (c) and 2 (c) show one embodiment of a steel plate frame for an electric motor of the present invention.
(A) is a front view of a steel plate frame for electric motors, (b) is a side view thereof, and (c) is an enlarged view of a main part centering on a lead wire hole portion of a cross section taken along line XX of those drawings. .. Figure 2
FIG. 2A is an enlarged view of a main part of a cross-section showing the lead wire hole 3 in the previous process state, and FIG. 2B shows the lead wire hole 3 in a finished state with the lead wire hole 3 in FIG. FIG.

The frame 1 is composed of a lead wire hole 3, a burring 2 provided in the process of manufacturing the lead wire hole, and a punching hole 2a. First, as a countermeasure against the first problem, that is, the punching burrs 2a or the occurrence of a sharp edge due to the punching process, the lead wire in the punching direction 3c of the lead wire heading from the frame inner circumference 1b to the frame outer circumference 1a. The prepared hole 3a is punched. afterwards,
The burring 2 is also processed in the burring molding direction 3b from the frame inner circumference 1b to the frame outer circumference 1a. At this time, the height of the burring 2 is preferably 1.5 times or more the plate thickness of the frame 1. This burring height serves as a positioning reference when a terminal box or the like manufactured in a separate process is installed on the frame 1, and serves as a measure for preventing the second problem of positional displacement.

In the sectional view of the essential portion of the electric motor stator of FIG. 3 (a) using the steel plate frame for an electric motor according to one embodiment of the present invention, the lead wire 5 is raised from the stator coil end 4a to form the lead wire hole. When passing through 3, the lead wire 5 can pass smoothly due to the curved shape of the burring 2. Further, since the punching bur is also located on the outer peripheral side of the lead wire hole 3, the burring 2 acts extremely effectively for protecting the coating of the lead wire 5 because it does not come into contact with the lead wire 5. Other than that, as shown in FIG. 4A, the burring 2 acts extremely effectively as a positioning guide for the terminal box 6 and the like.

Other than the above operation, FIG. 4 (b) and FIG.
This will be described in (c). 4 (b) and 4 (c) are shown in FIG.
It is an enlarged view of the Z section of (a), and as shown in FIG.
After positioning with the burring 2, when the welding bead 7 is fixed by welding as shown in the case of FIG. Airtightness can be easily secured. In the case of FIG. 4 (c), the burring 2 is caulked by caulking.
And the terminal box 6 can be fixed easily and surely.

As an effect, firstly, there is a protective function of the coating of the lead wire. This is not only effective only when the lead wire 5 is passed through the lead wire hole 3, but is also extremely effective against shock during transportation and external force applied to the lead wire 5 when the drive power source is connected. Secondly, it is effective as a positioning function to prevent misalignment of accessory parts such as the terminal box 6 and the like. Thirdly, as a method of fixing a terminal box or the like, when it is necessary to prevent rainwater from entering, welding is used as shown in FIG. 4 (b). It is possible to have flexibility in the attachment method such as that which can be dealt with by the caulking method such as).

[0015]

EFFECT OF THE INVENTION By punching out the pilot hole of the lead wire hole from the inner peripheral side of the cylindrical frame to the outer peripheral side, the punching burr 2
By aligning the directions in which a is generated, it is possible to align all the punching burrs 2a after forming the burrings 2 on the outer circumference of the frame in the next step at positions where the lead wires 5 do not contact. Further, from the background that the burring 2 can be utilized as a positioning guide for a component additionally attached, the effect of the present invention is that the lead wire 5 can be completely protected from damage.

In addition, the positioning accuracy of the accessory parts is also improved, and in addition to the above-mentioned lead wire protection function, it is also possible to improve and stabilize the mountability, and further improve the waterproof property after mounting. By using the steel plate frame for an electric motor according to the present invention, it becomes possible to provide a highly reliable electric motor.

[Brief description of drawings]

FIG. 1 (a) is a front view of a steel plate frame for an electric motor according to the present invention, (b) is a side view of (a), (c) is (a),
The principal part enlarged view centering on the lead wire hole part in the cross section along the XX line of (b).

2A is an enlarged cross-sectional view of an essential part showing a lead wire pilot hole in a final step, and FIG. 2B is a cross-sectional view taken along line XX in FIG. 1A showing a lead wire hole in a final step. Enlarged view.

FIG. 3 is a sectional view of an important part in which a stator core is press-fitted into a steel plate frame and lead wires are taken out of the frame.

4 (a) is an enlarged cross-sectional view of a main part showing that the terminal box is positioned in the lead wire hole portion, and FIG. 4 (b) is Z of FIG. 4 (a).
The figure where the part is welded and fixed. (C) is an enlarged cross-sectional view of a main part similarly fixed by caulking.

5A is a view corresponding to FIG. 1A of a conventional cylindrical frame made of a steel plate. FIG. 5B is a side view of FIG. (C)
1A is an enlarged cross-sectional view of a main portion of a lead wire hole portion of a cross section taken along line Y-Y in FIGS. 1A and 1B.

[Explanation of symbols]

1 ... frame, 1a ... frame outer circumference, 2
... Burling, 3 ... Lead wire hole, 3a ... Lead wire pilot hole, 3c ... Lead wire pilot hole punching direction, 5 ...
Lead wire, 7 ... welding bead, 8 ... crimping part.

Claims (1)

Claims: 1. For taking out a lead wire from the inner peripheral side of the cylindrical frame, in which a flat plate made of a steel plate cut to a predetermined size is roll-formed into a cylindrical shape, and the butted portion is welded, from the inner peripheral side toward the outer peripheral side. It is characterized by punching the pilot hole of the hole and forming a flange-like shape, so-called burring processing, so that the entire circumference of the end of the lead wire extracting pilot hole travels to the outer peripheral surface of the cylindrical frame in the same direction. Steel plate frame for electric motors.