JPS60204236A - Motor - Google Patents

Abstract

PURPOSE:To obtain a motor which attains effective heat sink effect by laminating stator core plates punched in a noncircular shape at the outer periphery by displacing one of the heat sink plates of the core at the position. CONSTITUTION:Stator core plates 15 are punched in a circular shape having heat sink plates 14 projected at part of the outer periphery. The plates 14 are utilized at one corner of core blank plates 13, and punched at the other three corners 16. In case of punching, a central hole 18 for inserting a rotor and a slot 19 for a winding are simultaneously punched at the plates 15. The plates 15 are so laminated that the plates 14 are displaced at a certaim angle at every one, and an air gap 21 is formed between the plates 14 at the outer periphery of a stator core 20. Thus, a motor which has high heat sink effect, a small size and a high power can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an electric motor used for driving industrial machinery, etc.

Conventional configurations and their problems In general, electric motors must have an effective heat dissipation structure, especially in order to achieve smaller size and higher output. By the way, as shown in Fig. 1, a normal electric motor exposes the outer circumference of the stator core 2 to which the winding 1 is attached in order to radiate heat, but the surface area of the exposed portion is small and it is not necessarily an effective means of heat radiation. No, no.

In addition, 3 in FIG. 1 is a rotor equipped with a permanent magnet 4 on the outer circumference, 6 is a rotating shaft, 6 is a bearing, and 7 is a bracket.

For this reason, as shown in Fig. 2, the stator core 2
It has been considered that a heat sink 9 having fins 8 is attached to the outer periphery of the heat sink. Although this device can be expected to effectively dissipate heat, it requires the heat dissipation body 9, which is a separate component, and has the drawback of significantly increasing the material cost.

Now, considering the stator core 2, as shown in Fig. 3, it is obtained by punching out a white-shaped stator core plate 2a from the core material plate 1o, and a portion 10 is discarded as punched scraps.
There are a lot of &, making it uneconomical in terms of materials. In addition, 1 in the figure
1 is a center hole for inserting the rotor, and 12 is a slot for winding.

OBJECTS OF THE INVENTION The present invention takes into consideration the above-mentioned conventional problems and aims to provide an electric motor that is economical in terms of materials and can provide an effective heat dissipation effect.

Structure of the Invention In order to achieve the above-mentioned object, the present invention involves punching out a portion that would normally be discarded as scraps when punching a stator iron stone plate from an iron core material plate into a shape that can be used as a heat dissipation plate. An electric motor characterized by a stator core structure in which the position of the heat dissipation plate part of the stator core plate is shifted by a certain angle one by one or every few sheets and fixed by laminating them to form the stator core. There is a gap between the heat sinks located at the same angular position, and since the stator core plate is used as the heat sink, which is in direct contact with the winding section, which is the heat generating section, heat conduction is good, and its heat dissipation effect is This makes it possible to obtain a small and lightweight electric motor with an inexpensive cooling structure that does not require separate parts for cooling.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 4 to 7.

In FIG. 4, reference numeral 13 denotes a rectangular core material plate, which is obtained by punching out a circular stator core plate 15 having a heat sink 14 projecting from a part of its outer periphery.

One corner of the core material plate 13 is used as the heat sink 14, and the other three corners 16 are used as scraps.

Further, during punching, a center hole 18 for rotor insertion and a slot 19 for winding are simultaneously punched out in the fixed core plate 16. FIG. 6 shows a stamped stator core plate 15. As shown in FIG.

A stator core 20 is constructed by laminating a large number of stator core plates 16 as shown in FIG. That is, the stator core plates 15 are stacked such that the heat sinks 14 of each stator core plate are shifted by a certain angle, and gaps 21 are formed between the heat sinks 14 on the outer periphery of the stator core 2o.

FIG. 7 shows an electric motor incorporating the stator core 20, where 22 is a wire, 23 is a rotor, 24 is a rotating shaft, and 25
is a bracket.

The electric motor having the above structure is advantageous in terms of materials because it utilizes as the heat dissipation plate 14 a member that was previously discarded as waste. In addition, the winding 22, which is a heating element, contacts the stator core 2o through a thin insulating layer, and the heat sink is integrated with the stator core 20, so the heat dissipation effect is high, and the motor is small and high output. It is effective for

In the embodiment described above, the positions of the heat sinks 14 are shifted one by one, but the positions may be shifted every few heat sinks.

8 to 10 show another embodiment of the present invention, in which four heat sinks 14 are protruded from the outer periphery of a stator core plate 15, and the four heat sinks 14 are attached to the core. Four corners of the material board 13 are utilized.

In the configuration of the stator core 20, each stator core plate 15 is stacked on top of the other with a 45 degree offset as shown in FIG. 7, thereby forming a required gap 21.

Note that the stator core plate 15 may be shifted in position as long as the rotation angle is other than 0° so that the heat sinks do not overlap.

Effects of the Invention As has been made clear from the above explanation, the present invention has a non-circular outer circumferential shape so that when punching a stator core plate from a core material plate, the part that would normally be discarded as scraps can be used as a heat sink. A stator that is laminated and fixed by punching out stator core plates and stacking these stator core plates to form a stator core, shifting the position of the heat sink part of the stator core plates by a certain angle one by one or every few sheets. It is an electric motor characterized by an iron core structure, and is laminated.

A gap is formed between the heat dissipation plate parts, and since the stator core plate is used as a heat dissipation plate which is in direct contact with the winding part which is the heat generating part, heat conduction is good and the heat dissipation effect is improved. This has an industrial effect in that it is possible to obtain a small and lightweight electric motor with an inexpensive cooling structure that does not require separate parts for cooling.

[Brief explanation of the drawing]

Figures 1 and 2 are sectional views of a conventional electric motor, respectively;
FIG. 3 is a punched explanatory diagram of the stator core plate, FIG. 4 is a punched explanatory diagram of the stator core plate in one embodiment of the present invention,
Fig. 5 is a plan view of the stator core plate, Fig. 6 is a side view of the stator core, Fig. 7 is a sectional view of a motor using the stator core, and Fig. 8 is another embodiment of the present invention. A punched explanatory diagram of the stator core plate in the example, FIG. 9 is a front view of the stator core, 1'
Figure 0 is the same side view. 14... Heat sink, 15... Stator core plate, 20... Stator core, 22... Winding. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 1°/'% fO to fO -20° 1j -fOα 1, . 5' Fig. 7 Fig. 8

Claims (1)

[Claims] An electric motor equipped with a stator core in which non-circular stator core plates having a heat sink integrally formed on the outer periphery are laminated with the heat sink being shifted from the heat sink of other stator core plates. .