JPH0648350U - Motor laminated core - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the difference in magnetic resistance between the salient poles of the laminated core and reduce the overall magnetic resistance to make the motor highly efficient. [Structure] A split core plate 19 in which salient poles 11a to 11c are formed in a radial direction is formed from a magnetic plate 3 formed by rolling, and a split core 11 is formed by laminating a plurality of the split core plates 19.
-14 are arranged in an annular shape, and the split cores 11-14 are configured such that the radial directions of the salient poles 11a-11c and the rolling direction 5 of the magnetic plate are substantially the same. [Effect] The difference in magnetic resistance between all salient poles on the circumference can be reduced, and the magnetic resistance of the entire laminated core is also reduced, so that the motor can be made highly efficient.
Further, by forming the split core, it is possible to significantly reduce the amount of material used such as a magnetic plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated core of a motor formed by laminating a plurality of core plates.

[0002]

[Prior art]

 As a general laminated core of this type, a large number of salient poles for winding the drive coil are formed on a laminated core in which multiple core plates are laminated, and all these salient poles are formed to project in the radial direction. There is. The laminated core of this motor will be described with reference to FIG. In FIG. 5, the laminated core 1 is formed with a large number of salient poles 2 protruding in the radial direction on the outer peripheral side according to the number of phases of the motor. In this laminated core 1, a magnetic plate 3 shown by a chain double-dashed line made of a silicon steel plate or the like formed by rolling is punched to form a core plate 4 in the shape of the laminated core 1, and a plurality of core plates 4 are formed. It is constructed by stacking one sheet.

It is known that the magnetic resistance of each of the magnetic plates 3 changes at an angle different from the rolling direction 5 shown by the arrow. That is, in the salient pole 2a relatively close to the rolling direction 5, since the angle θ1 between the radial direction 6 of the salient pole 2a and the rolling direction 5 is small, the magnetic resistance of this salient pole 2a is small. However, since the salient pole 2b has a large angle θ2 with the rolling direction 5, the magnetic resistance of the salient pole b becomes large. For this reason, in the lamination process of the core plates 4, the core plates 4 are laminated while being rotated by a predetermined angle so that the rolling directions of the core plates 4 are different from each other, thereby alleviating the difference in magnetic resistance between the salient poles 2. I am doing it.

[0004]

[Problems to be solved by the device]

 In the laminated core 1, in order to reduce the difference in magnetic resistance between the salient poles 2 depending on the angle with respect to the rolling direction 5, it is necessary to laminate the core plates 4 while rotating the core plates 4 by a predetermined angle in the laminating step. Since such rotary laminating work is complicated, a lot of man-hours are required, and in the case of automatic laminating, a complicated mechanism is required as a laminating device, and the control device is also complicated. Therefore, there is a problem that the cost is inevitably high.

The present invention has been made to solve such a problem, and reduces the magnetic resistance difference between the salient poles of the laminated core and reduces the overall magnetic resistance to improve the motor performance. An object of the present invention is to provide a laminated core of a motor that can be made efficient.

[0006]

[Means for Solving the Problems]

 In the present invention, salient poles are formed in a radial direction on an annular core plate made of a magnetic plate formed by rolling, and in a laminated core in which a plurality of core plates are laminated, the laminated core is divided into a plurality of layers. The split cores are arranged in an annular shape, and the split cores are configured such that the radial direction of the salient poles and the rolling direction of the magnetic plate are substantially the same.

[0007]

[Action]

 When the radial direction of each salient pole formed on each split core and the rolling direction of the magnetic plate are made to substantially coincide with each other and the split core plates are arranged in an annular shape to form a laminated core, the entire circumference The difference in the magnetic resistance between all the salient poles is reduced, and the magnetic resistance of the entire laminated core is also reduced, thereby improving the efficiency of the motor. In addition, the circular laminated core is wasted because the central hole is discarded, but since there is no central hole in the split core, the amount of material made of magnetic plate is significantly reduced. .

[0008]

【Example】

 Embodiments of a laminated core of a motor according to the present invention will be described below with reference to the drawings. In FIG. 1, the laminated core 10 is formed in an annular shape, and 12 salient poles that are multiples of 3 are formed at equal angular intervals on the outer peripheral side so that, for example, three-phase drive coils can be wound. Each of these salient poles protrudes in a radial direction from the center toward the outside. Furthermore, the laminated core 10 is formed by laminating core plates, but in the present invention, the laminated core 10 is divided into four, and the divided cores 11, 12, 13, 14 are mutually separated. They are arranged in an annular shape through the cut portions 15, 16, 17, and 18 in which both ends are joined. Each of the split cores 11 to 14 is formed with three salient poles 11a, 11b, 11c. Further, the split cores 14 to 14 are integrally formed by accurately connecting them by a connecting means such as resin or metal (not shown).

The split cores 11 to 14 are formed by stacking a plurality of split core plates 19 having the shape shown in FIG. As the material of the split core plate 19, the magnetic plate 3 made of a silicon steel plate formed by rolling which is usually used in a motor is used. Then, the split core plate 19 is sequentially punched from the magnetic plate 3 by pressing as shown in FIG.

As shown by the arrow in FIG. 2, these split core plates 19 are set so that the radiation direction of the central salient pole portion 19 a and the rolling direction 5 of the magnetic plate 3 coincide with each other. In addition, the protruding directions of the salient poles 19b and 19c on both sides are slightly different from the protruding direction of the salient pole 11, but there is no great difference with respect to the rolling direction 5 of the magnetic plate 3, and they are substantially in the same state. It has become. The punching is performed so that the radial direction of the salient poles 19a and the rolling direction 5 of the magnetic plate 3 coincide or substantially coincide with each other in order to minimize the magnetic resistance of each split core plate 19.

The split core plates 19 formed as described above are laminated in a predetermined number to form the split cores 11 to 14. After that, as shown in FIG. 1, the split cores 11 to 14 are joined to each other at their both ends and arranged in four to form an annular laminated core 10. Cut portions 15 to 18 are formed at the joints of the split cores 11 to 14, respectively. In this structure, since the divided cores 11 to 14 are laminated with the divided core plates 19 having the smallest magnetic resistance, the magnetic plates 3 are also shown in the divided cores 11 to 14 as shown by arrows. The rolling resistance is almost the same as the rolling direction, and the magnetic resistance is also the smallest. Therefore, the magnetic resistance of the laminated core 10 is several steps smaller than that of the conventional core.

FIG. 3 shows another embodiment of the present invention in which the amount of the magnetic plate 3 used is further reduced as compared with the above-mentioned example. In other words, since the split cores 21 to 24 constituting the laminated core 20 are formed by cutting the portions facing each other on both sides to form the cut portions 25 to 28, the width of each cut portion becomes large. Substantially salient poles 21a. ． The comrades are arranged in an annular shape with equiangular intervals. As a result, in this example, compared with the example shown in FIG. 1, not only the usage amount of the magnetic plate 3 is reduced, but also the weight corresponding to the small usage amount is reduced, which is an advantage that the weight can be further reduced. .

FIG. 4 shows still another embodiment of the present invention, which is a structural example of a laminated core 30 applied to an inner rotor type motor. That is, the plurality of salient poles 31a. ． The four divided cores 31 to 34, which are formed so as to project in the radial direction in which the respective projecting directions are toward the center, are arranged in an annular shape to form the laminated core 30. Also in this example, the salient pole 3 1a. ． And the rolling direction of the magnetic plate 3 are made to coincide with each other, so that the magnetic resistance is small.

In the above embodiment, the number of salient poles is three so that the split core is applied to three phases. However, in the case of two or four phases, the number of salient poles is two or four. The number of salient poles formed in the split core may be set to be the same as the number of phases of the motor or an integral multiple of the number of phases, such as individual pieces, and can be variously changed without departing from the present invention.

[0015]

[Effect of device]

 As is clear from the above description, in the laminated core of the motor of the present invention, the radial direction of each salient pole formed in each split core and the rolling direction of the magnetic plate are made to substantially coincide with each other. Since they are arranged in an annular shape to form a laminated core, it is possible to reduce the difference in magnetic resistance between all salient poles on the circumference, and the magnetic resistance of the entire laminated core is also reduced. Can be highly efficient. In addition, the use of split cores has the advantage of significantly reducing the amount of materials used such as magnetic plates.

[0016]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a laminated core of a motor according to the present invention.

FIG. 2 is a plan view showing a split core plate in the laminated core.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a plan view showing another embodiment of the present invention.

FIG. 5 is a plan view showing a laminated core of a conventional motor.

[Explanation of symbols]

 3 Magnetic plate 5 Rolling direction 10 Laminated core 11 to 14 Split core 11a to 11c Salient pole 15 to 18 Cutting part 19 Split core plate

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped core plate made of a magnetic plate formed by rolling is formed with salient poles protruding in a radial direction. In a laminated core in which a plurality of the core plates are laminated, the laminated core is divided into a plurality of layers. The split cores are formed by arranging the split cores in an annular shape, and the split cores are configured such that the protruding direction of the salient poles and the rolling direction of the magnetic plate are substantially the same.