JPH0652346U - Motor laminated core - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the non-uniformity of magnetic flux and prevent the deterioration of motor characteristics due to cogging and torque ripple. A laminated core in which a plurality of strip-shaped core plates 3 each having a plurality of salient poles 11 bent in an annular shape so as to form a joint portion 4 with both ends facing each other are laminated, The core plate 3 is laminated so that the seam portions 4 are arranged at substantially equal intervals in the circumferential direction. [Effect] Since the laminated core can make the magnetic flux uniform around the entire circumference and local magnetic loss is reduced, it is possible to eliminate the causes of characteristic deterioration as a motor such as torque ripple and cogging. The rotation performance of can be improved.

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 band-shaped core plates bent in an annular shape.

[0002]

[Prior art]

 This type of laminated core is generally formed by laminating a plurality of core plates. As this core plate, a method is known in which a strip-shaped core material having a large number of salient poles integrally formed in one of the widthwise directions is bent into an annular shape.

FIG. 4 shows an example of the laminated core as described above. The outer periphery of the laminated core 1 is provided with twelve salient poles 2 in the radial direction so that three-phase drive coils (not shown) can be wound. It is formed to project. The laminated core 1 is formed by laminating a plurality of strip-shaped core plates 3 that are bent and formed in an annular shape with both ends facing each other, and a joint portion is provided at a position where both ends of the core plate 3 face each other. 4 are formed.

The material 5 of the core plate 3 is made of an anisotropic core material formed in a linear band shape, and salient poles 2 are formed on one side in the width direction as shown in FIG. The length of the material 5 is set to the length of the circumference of the laminated core 1 shown in FIG. 4, and the number of salient poles 2 is set to 12. The material 5 is formed into a flat shape by a well-known proper bending device so that the salient poles 2 are located on the outer periphery as shown by the chain double-dashed line in FIG. 3, and the core is formed by facing both ends of the material 5. The plate 3 is formed. One seam portion 4 is formed at the opposing portions on both ends, and a plurality of core plates 3 are laminated while the seam portions 4 are aligned with each other to form the laminated core 1 shown in FIG.

[0005]

[Problems to be solved by the device]

 However, in the laminated core 1, since the seam portions 4 of the plurality of core plates 3 are aligned and laminated, the magnetic resistance of the seam portion 4 becomes large, and thus the magnetic flux loss in this portion is reduced. It becomes large and the magnetic flux becomes non-uniform. For this reason, there is a problem that cogging occurs or the torque ripple deteriorates, and the characteristics of the motor deteriorate.

The present invention has been made in order to solve such a problem, and it is possible to eliminate the non-uniformity of magnetic flux and prevent deterioration of motor characteristics due to cogging or torque ripple. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 The present invention is a laminated core in which a plurality of strip-shaped core plates having a plurality of salient poles, which are bent and formed in an annular shape so that both ends are opposed to each other to form a seam, are laminated. The core plate is characterized in that the seams are laminated so as to be arranged at equal intervals in the circumferential direction.

[0008]

[Action]

 If the seams of multiple core plates are laminated so that they are arranged at equal intervals in the circumferential direction, the magnetic flux will be uniform over the entire circumference of the laminated core, and local magnetic loss will decrease, so that the torque The causes of characteristic deterioration such as ripples and cogging are eliminated, and a motor with smooth rotation performance is provided.

[0009]

【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 twelve salient poles 11, which are multiples of 3, are formed at equal angular intervals on the outer peripheral side so that a three-phase drive coil can be wound. Each of these salient poles 11 protrudes outward from the center in the radial direction. The laminated core 10 is formed by laminating the core plates 3, but in the present invention, the core plate is projected to one side in the width direction of the anisotropic core material formed in the linear band shape as described above. A core plate 3 is used in which a material 5 having poles is bent into a flat shape so that salient poles are located on the outer circumference.

When stacking a plurality of core plates 3, one seam portion 4 formed at the facing portion at both ends of the core plate 3 described above is arranged at substantially equal intervals in the circumferential direction. There is. Incidentally, in the example of FIG. 1, since the three core plates 3 are laminated, the joint portions 4 of each core plate 3 are arranged at equal intervals of 60 °. Further, when four core plates 3 are laminated, the seam portions 4 are arranged at an angle of 90 °, respectively, and when six core plates 3 are laminated, the seam portions 4 are formed at an angle of 30 ° or 60 °. Are evenly spaced.

When the seams 4 are arranged at equal intervals in this way, the magnetic loss due to the seams 4 is evenly distributed over the entire circumference of the laminated core 10, so that they can be made magnetically uniform. Therefore, when a drive magnet (not shown) is opposed to the outer periphery of the laminated core 10, the occurrence of cogging is reduced and the torque ripple is reduced, so that a smooth rotating motor can be obtained.

In the above embodiment, the laminated core is applied to three phases, but it goes without saying that it can be applied to two phases or four phases. In addition to the outer rotor type motor shown in FIG. 1, the present invention may be applied to a laminated core for an inner rotor type motor, and various modifications can be made without departing from the scope of the present invention.

[0013]

[Effect of device]

 As is clear from the above description, in the laminated core of the motor of the present invention, the joint portions of the plurality of core plates are laminated so that they are circumferentially arranged at substantially equal intervals, so that the laminated core has magnetic flux over the entire circumference. Can be made uniform, and the local magnetic loss is reduced, so that the causes of characteristic deterioration as a motor such as torque ripple and cogging can be eliminated, and the rotational performance of the motor can be improved. There are advantages.

[0014]

[Brief description of drawings]

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

FIG. 2 is a sectional view of a main part of the laminated core.

FIG. 3 is an explanatory view showing a state of a manufacturing process of the core plate.

FIG. 3 is a plan view showing a laminated core of a conventional motor.

[Explanation of symbols]

 3 core plate 4 seam part 10 laminated core 11 salient pole

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[Procedure amendment]

[Submission date] December 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

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

FIG. 2 is a sectional view of a main part of the laminated core.

FIG. 3 is an explanatory view showing a state of a manufacturing process of the core plate.

FIG. 4 is a plan view showing a laminated core of a conventional motor.

[Explanation of Codes] 3 core plate 4 seam portion 10 laminated core 11 salient pole

Claims (1)

[Scope of utility model registration request] 1. A laminated core in which a plurality of strip-shaped core plates having a plurality of salient poles, which are bent and formed in an annular shape so as to form a seam portion with both ends facing each other, are laminated. The core plate is a laminated core of a motor in which the seams are laminated so as to be circumferentially arranged at substantially equal intervals.