JPS6039344A - Manufacture of frame for motor - Google Patents

Abstract

PURPOSE:To facilitate a manufacturing work of a frame by sequentially welding a heat sink fan to a frame body while facing the extension piece of the fin over an adjacent bonding piece. CONSTITUTION:A crankshaft-shaped sectional heat sink fin 17 is welded to a cylindrical frame body 11 of a motor 16. A narrow angle theta formed between an erecting piece 19 of the fin 17 and an extension piece 20 and a fin pitch P are regulated to vary intervals A, B, thereby controlling the heat dissipation by a blower fan 14. The fin 17 is welded in advance to the outer periphery of the body 11 by the welding of the fin 17, and a bonding piece 18 of the fin 17 is then welded to the body 11. In this case, the piece 20 of the fin 17 is faced over the bonding piece 24 of the adjacent fin 23, and the piece 18 is sequentially welded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a frame for an electric motor equipped with radiation fins.

[Prior art]

Generally, the temperature of an electric motor increases during operation due to internal power loss. If this increase is excessive, the deterioration of the insulator will be accelerated, which will eventually lead to burnout. For this reason, in electric motors, a blower fan is installed on the motor shaft to blow air as it rotates, or heat dissipation fins are installed on the outer circumferential surface of the frame body to increase the contact area with the air to dissipate internal heat to the outside. It is possible to suppress the temperature rise by
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Conventionally, materials made of cast iron or steel plates have been used as frame materials for this type of electric motor.

However, the former method requires a large amount of cast iron, and melting the cast iron consumes a large amount of thermal energy, which increases manufacturing costs.

On the other hand, in the latter case, as shown in Fig. 1 (a) and (b), the joint part (3) of the rectangular radiation fin (2) is attached to the outer peripheral surface of the frame body (1) by welding. Because of welding, the inner circumferential surface of the frame body (1) is deformed due to welding distortion, and as a result, it is necessary to process the inner diameter of the frame body (1) after welding the radiation fins (2), which complicates frame manufacturing work. There is a drawback that it does. Furthermore, since the weld bead is formed on the outer peripheral surface of the frame body (1), there is a disadvantage that the appearance is poor. Furthermore, the rectangular heat dissipating fins (2) have the disadvantage that the air blown by the blower fan (4) is likely to diffuse, and that dust adheres to the outer peripheral surface of the frame body (1), impairing heat conduction.

Therefore, as shown in Figure 2, a rectangular heat radiation fin (2) is used.
is made 11 times higher in the radial direction of the frame body (1),
It is possible to increase the number of shift-ins by decreasing the pitch q and improve the heat dissipation effect, but in this case,
There are disadvantages in that the external dimensions of the entire electric motor have increased and the welding distortion of the frame body (1) has increased.

[Summary of the invention]

The present invention has been made in view of the above circumstances, and by resistance welding the heat dissipating fin and the frame body, the extended piece of the heat dissipating fin faces onto the joining piece of the adjacent heat dissipating fin, thereby achieving The present invention provides a method for manufacturing a frame for an electric motor that has excellent heat dissipation efficiency and does not require processing the inner diameter of the frame body. Hereinafter, the configuration will be explained in detail with reference to embodiments shown in the drawings.

[Embodiments of the invention]

FIG. 3 is a perspective view showing a frame in which the method for manufacturing an electric motor frame according to the present invention is carried out, and FIG. 4 is a front view showing the main parts of the frame.

In these figures, the symbol (l) indicates a cylindrical frame body into which a laminated core (2) with a slot (121) is press-fitted. (14) is a fan for cooling the motor; It is installed on the rotor-like electric motor a0. ← is a heat dissipation fin with a crankshaft-shaped cross section, and this piece a0 is connected to the joint piece cod that is joined by bending a steel metal plate.
It is composed of an upright piece 0 and an extending ring extending in the opposite direction to the joint piece Q81, and the internal heat conducted to one side of the joint is radiated from the extending piece (2I) through the upright piece The spliced ring is integrally formed with a protrusion for bridgeection welding (two glazes) by press molding on the splicing surface ←υ.
Joint piece c! 4) Positioned in a position facing the top,
The intervals A and B are changed by adjusting the included angle (θ0) formed by the upright piece (II) and the fin pitch (p), and the dust adhering to the heat dissipation fin plate is wiped away by the air blowing by the blower fan Q4). It is configured as follows. (c) is a cavity formed between the heat radiation fins a and (c), and the upright piece 0. The size of the fan (4) is determined by the height of the opening (4) and the fin pitch (p), and controls the dispersion of air by the blower fan (14).

Next, a method of manufacturing the electric motor frame having the above structure will be described.

First, one side of the metal plate to be joined by bending and this piece α
A heat dissipation fin body having a crankshaft-like cross section is formed by an upright piece a1 set up on camphorwood and a joint piece (extending piece e extending in the opposite direction to l).Next, this heat dissipation fin αη is formed in advance into a cylindrical shape. After attaching the heat dissipating fins aD to the outer peripheral surface of the frame body aυ, the heat dissipating fins aD and the frame body aυ are welded by projection welding.
Joint piece Q of the heat dissipation fin (c) adjacent to the extended ring of 7)
Weld in sequence while facing above a. In this way, a large number of heat dissipating fins aη.

(c) When welding , . . . to the outer peripheral surface of the frame body αυ, .

In this example, a projection welding method was used as the welding method, but the present invention is not limited to this, and the same effects as in the example can be obtained even if a resistance welding method such as spot welding is used. .

Further, in the embodiment, the present invention is applied to an electric motor, but the present invention can also be applied to equipment such as a transformer and an electric resistor that require heat dissipation.

〔Effect of the invention〕

As explained above, according to the present invention, there is a method in which a metal plate is bent to form a heat dissipation fin having a cross section shaped like a crankshaft, and the heat dissipation fin is resistance welded to a frame body, and the extension of the heat dissipation fin is By sequentially welding the pieces while facing the joined pieces of adjacent radiation fins, it is possible to obtain an electric motor frame that is small, has excellent heat radiation efficiency, and does not require processing the inner diameter of the frame body after welding the radiation fins. . Therefore, it can be manufactured economically and the frame manufacturing work can be easily performed. In addition, unlike conventional arc welding methods, no weld beads are formed, and the appearance is also very good.

[Brief explanation of the drawing]

FIGS. 1(R) and (b) are front and side views showing a conventional electric motor frame, FIG. 2 is a front view showing essential parts of the electric motor frame, and FIG. 3 is an electric motor frame according to the present invention. FIG. 4 is a perspective view showing a frame in which the manufacturing method of FIG. aυ...Frame body, (lη...radiating fin, ([8)...joint piece, C9)...upright piece, C
20... Extension piece, (23)... Radiation fin, C
24)...Joint piece. Agent Masu Oiwa Ga L Procedural amendment (voluntary) July 118, 1982 Commissioner of the Japan Patent Office 1, Table 7i' of the case? Patent Application No. 146889/1989
A2, Title of the invention: Method for manufacturing a frame for electric motor 3, Person making the amendment Representative Hitoshi Katayama Department 4, Agent (1) 8A Claims column 6 of the detailed description Contents of the amendment (1) Description of the description The scope of claims is amended as shown in the attached sheet. (2) Delete "1 resistance" on page 3, line 16 of the same book. (3) “Upright piece (1
9) from the extending piece (20) through the upright piece (19) and the extending piece (20).
0) is radiated from both sides. (4) “Joint piece (
18) is integrally formed. ” to be deleted. (5) "Projection" in page 5, line 16 of the same book is deleted. (6) "In addition,..." in lines 2 to 5 of page 6 of the same book.
・Effective. ” to be deleted. (7) Delete "resistance" from page 6, line 12 of the same book. (8) Figures 3 and 4 are corrected as shown in the attached drawings. The attachment above states, ``A heat dissipation fin with a cross section shaped like a crankshaft is formed by a joining piece joined by bending a metal plate, an upright piece erected on this piece, and an extending piece extending in the opposite direction to the joining piece. , a method in which the heat dissipation fin is attached to the outer peripheral surface of a frame body formed in a cylindrical shape in advance, and the heat dissipation twin is plated in a frame shape, and when welding, the extended piece of the heat dissipation fin is attached to the adjacent heat dissipation fin. A method of manufacturing a frame for an electric motor, characterized by sequentially welding the frame while facing the joint piece of the frame.

Claims (1)

[Claims] A heat dissipating fin having a cross section shaped like a crankshaft is formed by a joint piece joined by bending a metal plate, an upright piece standing on this piece, and an extending piece extending in the opposite direction to the joint piece. A method in which fins are attached to the outer peripheral surface of a frame body formed in a cylindrical shape in advance, and the heat dissipating fins and the frame body are resistance welded. A method of manufacturing a frame for an electric motor, characterized in that the welding is carried out sequentially while facing the joint pieces of the fins.