JP2006254617A - Laminated core for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent magnetic flux leakage between teeth in a stator of a motor having a laminated core, and to manufacture the laminated core easily. <P>SOLUTION: This manufacturing method of a stator of a motor includes a process of forming the laminated core 12 by laminating cores having a plurality of teeth pieces 11a arranged radially, and connected portions 11b that connect the inside circumferential side ends of each neighboring teeth pieces; a process of winding a wire 13 around the teeth of the laminated core; a process of inserting and fixing a cylindrical external core 14 onto the outside circumference of the laminated core in such a way as to close contact the outside circumferential ends 11c of the teeth pieces; and a process of cutting the connected portions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor including a rotor having magnetism on the outer periphery and a stator having teeth disposed around the rotor and wound with a winding, and in particular, fixing of a motor in which the stator includes a laminated core. Regarding the child.

In a conventional motor of the type in which a rotor is provided on the inner side, a stator composed of a laminated core is a laminated body in which a plurality of cores integrally including a cylindrical yoke and teeth extending from the yoke to the inner peripheral side are laminated. It has a core. The teeth are T-shaped. After laminating the core, wind the winding around each tooth. At this time, the winding is difficult to wind because the gap between the teeth is narrow. In particular, when performing lap winding, winding is very difficult and workability is poor. In order to solve this problem, there is a type in which the inner end portion of the teeth is connected to the inner end portion of the adjacent teeth, and the outer peripheral yoke is separated (see, for example, Patent Document 1). Here, in order to suppress leakage of magnetic flux between adjacent teeth, a thin portion is provided between the teeth.
WO 2004/021548 (FIG. 1, FIG. 2)

  In the above-described technology, processing for providing a thin portion between the teeth is necessary. In addition, it is difficult to adjust the thickness of the thin portion, and it is difficult to reduce the thickness of the thin portion to one third or less of the thickness of the teeth. If the thin portion cannot be made sufficiently thin, the leakage of magnetic flux between the teeth increases. Even if the timing of switching between adjacent teeth windings is well performed, if the leakage of magnetic flux is large, the driving force to the rotor is reduced and the performance is deteriorated.

  Therefore, an object of the present invention is to prevent leakage of magnetic flux between teeth and to easily create a laminated core.

  The technical means taken in order to solve the above-mentioned problem is a laminated core obtained by laminating a core having a plurality of teeth pieces arranged radially and a connecting part for connecting inner peripheral side ends of adjacent teeth pieces. And a step of winding a winding around the teeth of the laminated core, and a cylindrical outer core is inserted and fixed to the outer periphery of the laminated core so that the outer peripheral end of the teeth piece is in close contact And a step of cutting the connecting portion.

  Furthermore, the laminated core and the outer core are fixed by resin insert molding.

  Moreover, the said connection part was formed in the inner peripheral side rather than the inner peripheral side edge part of each teeth piece.

  According to the present invention, since the winding can be performed from the outside of the core, workability is improved. Further, since the inner peripheral side connecting portion is removed after completion, there is no leakage of magnetic flux to the adjacent teeth, and performance degradation can be prevented.

  Further, by fixing the laminated core and the outer core by resin insert molding, the laminated core and the outer core can be firmly fixed, and the relative position between the cores does not shift when the connecting portion is cut.

  Moreover, since the inner peripheral side of each teeth piece is arrange | positioned on the same periphery by forming a connection part in an inner peripheral side rather than the inner peripheral side edge part of each teeth piece, a connection part is this same Arranged inside the circle. Therefore, the connecting portion can be removed at once with a drill or press that cuts within the same circle, and the number of steps and costs can be reduced.

  Embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 shows the core 11. The core 11 is arranged radially with substantially I-shaped teeth pieces 11a so that the I-shaped lower side 11d faces the inner peripheral side. The I-shaped lower side 11d is a curved surface having the same center and radius. A gap is formed between the right end of the I-shaped lower side 11d of one tooth piece 11a and the left end of the I-shaped lower side 11d of the adjacent tooth piece 11a on the right side. The connecting portion 11b is connected to this gap. The connecting portion 11b connects the adjacent lower sides 11d in a semi-ring shape so as to be arranged on the inner peripheral side of the circumference formed by the I-shaped lower side 11d. One core 11 is formed by punching a thin magnetic plate by punching.

  A plurality of cores 11 formed in this way are prepared and stacked one above the other as shown in FIG.

  Next, as shown in FIG. 3, the winding 13 is wound around each of the laminated tooth pieces 11 a.

  Next, an external core 14 as shown in FIG. 4 is prepared. The outer core 14 has a ring shape and is provided with a cut portion 14a that matches the shape of the end portion 11c on the outer peripheral side of the tooth piece 11a. The outer core 14 is made of a magnetic material. The outer core 14 may be configured by laminating thin plates or may be integrated.

  Next, as shown in FIG. 5, the laminated core 12 wound with the winding 13 is fitted into the outer core 14. At this time, it inserts so that the notch part 14a of the outer core 14 and the edge part 11c of the outer peripheral side of the teeth piece 11a may contact | adhere.

  Further, as shown in FIG. 6, a resin 16 is poured into a space 15 formed between the laminated core 12, the winding 13 and the outer core 14, and the laminated core 12, the winding 13 and the outer core 14 are integrated with the resin. Mold.

  Next, the inner peripheral side of the curved surface having the same center and radius formed by the I-shaped lower side 11d is cut using a drill, a press, a polishing tool, or the like. The connection can be removed at once using a drill or press. In this step, the stator 10 of the motor is completed.

  Finally, as shown in FIG. 7, the inner peripheral side of the tooth piece 11a is positioned with a gap from the adjacent tooth piece. The rotor having a magnet on the inner periphery is rotatably arranged, and the winding 13 is energized to control the rotor.

The top view of the core of the embodiment of the present invention The perspective view of the lamination | stacking core which laminated | stacked the core of FIG. The top view of the laminated core which shows the manufacture process of the embodiment of this invention Top view of the outer core of an embodiment of the present invention The top view of the stator which shows the manufacture process of the embodiment of the present invention The top view of the stator which shows the manufacture process of the embodiment of the present invention The top view of the stator which shows the manufacture process of the embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Core 11a Teeth piece 11b Connection part 11c End part 11d of outer peripheral side I-shaped lower side 11d Lower side 12 Laminated core 13 Winding 14 External core 14a Cut part 15 Space 16 Resin

Claims (3)

Laminating a plurality of teeth pieces arranged radially and a core having a connecting part that connects inner peripheral side ends of adjacent tooth pieces to create a laminated core;
Winding a winding around the teeth of the laminated core;
Inserting and fixing a cylindrical outer core to the outer periphery of the laminated core so that the outer peripheral end of the teeth piece is in close contact;
Cutting the connecting portion;
The manufacturing method of the stator of a motor provided with this. The method for manufacturing a motor according to claim 1, wherein the laminated core and the outer core are fixed by resin insert molding. A core having a plurality of teeth pieces arranged radially and a connecting portion that connects inner peripheral side ends of adjacent teeth pieces,
The connecting portion is formed on an inner peripheral side of an inner peripheral side end portion of each tooth piece.

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