JPH1189131A - Squirrel cage-type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify facilities required for manufacture and to reduce manufacturing man-hour by constituting the core of a cage-type rotor by laminating metal plates for a plurality of sheets in different slot shapes and changing the sectional area of the slots. SOLUTION: A plurality of metal plates 13a for forming a slot 19a where a slot depth in radius direction is shallow and a plurality of metal plates 13b for forming a slot 19b where a slot depth is deep are laminated. In this case, a core part 20 with large starting torque characteristics since the sectional area of a slot 19 is small and a core part 21 with a small starting torque and a high efficiency on operation since the sectional area of the slot 19 is large are mixed. As a result, by properly distributing the length in each axial line direction of the core parts 20 and 21, the characteristics of a motor can be adjusted to desired starting torque and efficiency, thus reducing the number of molds required for manufacture and simplifying facilities and hence reducing manufacturing man-hour.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage motor.

[0002]

2. Description of the Related Art In a squirrel-cage motor, which has been widely used as a kind of motor, the secondary resistance of a squirrel-cage rotor greatly affects the starting current and starting torque of the rotator. The work of adjusting the secondary resistance in order to adjust the characteristics of the motor is widely performed. Conventionally, the adjustment of the secondary resistance of the cage rotor is performed by changing the shape of the end ring.

FIG. 7 is a diagram for explaining a conventional technique for adjusting the secondary resistance. FIGS. 7A and 7B show examples using different end rings. Each of the iron cores 3 of each of the rotors 1 and 2 in FIG.
And the same slot is formed in each of them. Iron core 3 of the same shape
If the required motor characteristics are different even in the case of a cage type motor having the above-described shape, either the end ring 4 having a thickness t1 shown in FIG. 7A or the end ring 5 having a thickness t2 shown in FIG. Is selected and used.

[0004]

In such a conventional method for adjusting the characteristics of a motor, it is necessary to change the size of the end rings 4 and 5 as described above. It is necessary to prepare a plurality of types of dies to be used for the above, and when it is necessary to change the end rings 4 and 5, it is necessary to replace the dies.
For this reason, there is a problem that a large amount of equipment and man-hours are required for manufacturing the cage motor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a squirrel-cage motor capable of simplifying equipment required for manufacturing and reducing the number of manufacturing steps. .

[0006]

In the cage motor according to the present invention, the iron core of the cage rotor is configured such that a plurality of metal plates having different slot shapes are laminated to change the cross-sectional area of the slot. ing. As a result, a portion having a small cross-sectional area of the slot and having high efficiency and a small starting torque at both start and operation, and a characteristic having a large cross-sectional area of the slot and having a large starting torque and a high operating efficiency. Parts will be mixed.

Thus, the characteristics of the motor can be properly adjusted by appropriately selecting the number of metal plates having different slot shapes and selecting the cross-sectional area of the slots to a desired extent.

Accordingly, when manufacturing the motor by casting, the outer shape of the rotor is not changed, so that it is not necessary to prepare a plurality of types of dies, and the necessity of changing the dies in accordance with the change in the characteristics of the motor is eliminated. Is done. This makes it possible to simplify equipment required for manufacturing and reduce the number of manufacturing steps.

In the present invention, the slot shape of each of the plurality of metal plates may be selected so as to have mutually different depths. Even in this case, it is apparent that the same operation and effect as described above can be obtained.

In the present invention, the plurality of metal plates may be caulked and connected to each other. In this case, in addition to the above operation and effect, the operation and effect of further simplifying the motor manufacturing process can be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 6 show one embodiment of the present invention.

FIG. 1 is a front view showing a partial cross section of an iron core used in the motor of this embodiment, and FIG. 2 is a front view of a plurality of types of metal plates used for the iron core of the rotor of the motor of this embodiment. 3 is an enlarged front view of the vicinity of the slot of the metal plate of FIG. 2, FIG. 4 is a front view showing a partial cross section of the rotor of the motor of the present embodiment, and FIG. 5 is a side view of FIG. FIG. 6 is a sectional view of an iron core according to another embodiment of the present invention.

Hereinafter, referring to FIG. 4 and FIG.
1 will be described. The rotor 12 built in the motor 11 is made of a metal material such as a silicon steel plate, for example, and includes a plurality of metal plates 13 in which a plurality of slots 19 are formed along the circumferential direction as shown in FIG. As will be described later, an iron core 14 is provided, and a rotating shaft 15 is fixed through the center of the iron core 14. A metal rod (not shown) penetrates through the slot 19 of the iron core 14, and end rings 16 and 17 are fixed to both ends thereof. The vicinity of both ends of the rotating shaft 15 is rotatably supported by bearings 25 and 26 fixed to a housing (not shown) of the motor 11.

As shown in FIG. 1 as an example, the iron core 14 of the rotor 12 of the motor 11 of this embodiment has a slot depth in the radial direction as shown in FIGS. 2 (1) and 3 (1). A metal plate 13a having a relatively shallow slot 19a formed therein and a slot 19b having a relatively deep slot depth D2 in the radial direction as shown in FIGS. 2 (2) and 3 (2) are formed. And a metal plate 13b. When the characteristics required for the motor 11 are other characteristics, a configuration in which a plurality of metal plates 13a, 13b, and 13a are stacked as shown in FIG. These metal plates 13a and 13b are caulked and connected to each other.

By adopting such a configuration, the secondary resistance is relatively large because the cross-sectional area of the slot 19 is small, and the efficiency is relatively small and the starting torque is large at both start and operation. Since the iron core portion 20 and the cross-sectional area of the slot 19 are large, the secondary resistance is relatively small, and the iron core portion 21 having a characteristic that the starting torque is small and the operation efficiency is high is mixed. Therefore, by appropriately allocating the axial lengths of the iron core portions 20 and 21, the characteristics of the motor 11 can be adjusted to obtain desired starting torque and efficiency.

In the present embodiment, when manufacturing the rotor 12 of the motor 11 by casting, when adjusting the characteristics of the motor 11, unlike the prior art,
Since the outer shape of the motor 11 is not changed, the necessity of preparing a plurality of types of dies used for casting is eliminated, and the necessity of a step change step of changing the dies in accordance with the change in the characteristics of the motor 11 is eliminated. As a result, the number of dies required for manufacturing is reduced, the equipment can be simplified, and the number of manufacturing steps can be reduced.

Further, in the motor 11 of this embodiment, since the metal plates 13a and 13b for each of the plurality of sheets are caulked and connected to each other, no special connecting parts or the like are required. The manufacturing process is simplified.

[0018]

As described above, according to the cage motor of the present invention, the iron core of the cage rotor is configured such that a plurality of metal plates having different slot shapes are laminated to change the cross-sectional area of the slot. Have been. As a result, a portion having a small cross-sectional area of the slot and having high efficiency and a small starting torque at both start and operation, and a characteristic having a large cross-sectional area of the slot and having a large starting torque and a high operating efficiency. Parts will be mixed.

Thus, the characteristics of the motor can be appropriately adjusted by appropriately selecting the number of metal plates having different slot shapes and selecting the cross-sectional area of the slots to a desired extent.

Therefore, when the motor is manufactured by casting, the outer shape of the rotor is not changed, so that it is not necessary to prepare a plurality of types of dies, and the necessity of changing the dies according to the change in the characteristics of the motor is eliminated. Is done. This makes it possible to simplify equipment required for manufacturing and reduce the number of manufacturing steps.

In the present invention, the slot shape of each of the plurality of metal plates may be selected so as to have mutually different depths. Even in this case, it is apparent that the same operation and effect as described above can be obtained.

In the present invention, the plurality of metal plates may be caulked and connected to each other. In this case, in addition to the above operation and effect, the operation and effect of further simplifying the motor manufacturing process can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing a partial cross section of an iron core 14 used in a motor 11 according to one embodiment of the present invention.

FIG. 2 shows an iron core 14 of a rotor 12 of the motor 11 according to the embodiment.
FIG. 3 is a front view of a plurality of types of metal plates 13a and 13b used in the first embodiment.

FIG. 3 is an enlarged front view of the vicinity of a slot 19a of the metal plate 13a of FIG.

FIG. 4 is a front view showing a partial cross section of a rotor 12 of the motor 11 of the present embodiment.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a sectional view of an iron core 14 according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating a conventional technique for adjusting a secondary resistance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Motor 12 Rotor 13, 13a, 13b Metal plate 14, 14a Iron core 16, 17 End ring 19, 19a, 19b Slot

Claims (3)

[Claims] A squirrel-cage motor in which a core of a squirrel-cage rotor is constructed such that a plurality of metal plates having different slot shapes are laminated to change the cross-sectional area of the slot. 2. The slot shape of each of the plurality of metal plates,
2. The squirrel-cage motor according to claim 1, wherein the squirrel-cage motors are selected to have different depths. 3. The squirrel-cage motor according to claim 1, wherein the plurality of metal plates are caulked and connected to each other.