JPS6130939A - Manufacture of stator core - Google Patents

Abstract

PURPOSE:To enhance the yield and to enable the automatic winding of a coil by punching arcuate piece in which the entire periphery is divided into integer number, laminating the pieces, winding the coil on the segments, and then annularly disposing and securing. CONSTITUTION:Pieces of the shape having arcuate yokes 12 including arcuate angles divided from 360 into integer number and pole pieces 13 integrally formed from the center of the yokes 12 are punched from silicon steel plates 14, the pieces are laminated in the prescribed number to form the arcuate core segments 11. Then, the segments 11 are rotated on the center line of the arcuate angle to wind an exciting coil 20, the segments 11 are annularly disposed in the prescribed number, secured at the ends of the yokes 12 of the adjacent segments 11 to form a stator core 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a stator core used in a DC motor or an AC motor.

FIG. 13 shows a three-pole stator core that has been commonly used in the past. That is, this stator core 1 has a yoke 2 formed in an annular shape, and three magnetic pole pieces 3 are integrally connected to the inner peripheral edge of the yoke 2 at intervals of 120 degrees.

In this case, the magnetic pole face 3a of each magnetic pole piece 3 is curved in a concave shape so as to define a rotor housing part together with the other two magnetic pole faces 3a, 3a, while an excitation coil is provided on each base end side. groove 3b for winding.

3b is provided. By the way, this stator core 1
is formed by stacking a plurality of magnetically permeable pieces. In this case, conventionally, as shown in FIG. The pieces are punched out in one piece using a press or the like. However, the shaded area shown in the figure results in material loss, resulting in a poor yield rate. In addition, directly winding the excitation coil in the grooves 3b, 3b at the base end of the magnetic pole piece 3 requires an expensive series winding machine, which is not desirable in terms of cost.
For this reason, in many cases, a pre-wound excitation coil is slightly waved using a special jig and installed between the grooves 3b, but this coil installation work is inefficient. This is an obstacle to mass production.

Therefore, an object of the present invention is to achieve a high yield rate.

Moreover, it is an object of the present invention to provide a method of manufacturing a stator core that allows excitation coils to be automatically wound directly around magnetic pole pieces without causing a substantial increase in cost.

That is, the present invention comprises an arcuate yoke having an arc angle of 360'/N (where N is an integer of 2 or more) and one magnetic pole piece integrally connected to the approximate center of the inner peripheral edge of the yoke. A step of punching out a piece having a shape including the shape from a magnetic steel plate such as a silicon steel plate using a press or the like, a step of stacking a predetermined number of the pieces to form a core segment, and rotating the core segment around the bisector of the yoke. a step of winding a coil wire around the proximal end side of the magnetic pole piece to wind an excitation coil while arranging the core segments, and arranging the N core segments in a ring, and bonding the ends of adjacent yokes with adhesive or It is characterized in that it includes a step of integrally joining by welding or the like.

The invention will now be described in detail with reference to embodiments illustrated in the accompanying drawings.

According to the invention, as shown in FIG.
It is made by combining 1. Each core segment 11 is composed of a laminate of magnetically permeable pieces, each of which includes an arcuate yoke 12 having an arc angle of 120 degrees, and an inner peripheral edge of this yoke 12, as illustrated in FIG. A magnetic pole piece 13 is provided integrally and continuously at approximately the center of the magnetic pole piece 13 . In this case, a protrusion 12a is provided on the end face of one end of the yoke 12, and a recess 12b having a shape complementary to the protrusion 12a is provided on the end face of the other end. In addition, the magnetic pole piece 13 is formed with a concavely curved magnetic pole surface 13a that defines a housing portion for a rotor (not shown), and an excitation coil is attached to the base end of the magnetic pole surface 13a.
Grooves 13b, 13b for winding are provided. Each piece constituting the core segment 11 is punched out of a silicon steel plate 14, for example, by a press, as shown in FIG. The punching can be performed with the distance between the outer circumferential edge of the yoke 12 and the magnetic pole surface 13a of another piece adjacent thereto as close as possible, and the material loss of the silicon steel plate 14 used (diagonal lines in the figure) (parts) will be smaller.

According to the present invention, the excitation coil 20 can be automatically wound around the magnetic pole piece 13 of each core segment in a simple manner as shown in FIG. 10. That is, as shown in FIGS. 4 and 5, a pair of left and right chuck/coil guide members 22a, 22b, which are combined to form a substantially truncated pyramid shape, are installed at the tip of the spindle 21 of the winding machine. are attached, and the magnetic pole surface 13 of the magnetic pole piece 13 is
While holding the a side and rotating the core segment 11 in a predetermined direction about the bisector of the arc angle of the yoke 12, the coil wire 20a is inserted into the grooves 13b and 1 of the magnetic pole piece 13.
By winding the excitation coil 20 between the core segments 3b, a predetermined number of turns of the excitation coil 20 can be directly wound around each core segment 11.

In addition, in order to prevent the coil wire 20a from being cut and the insulating coating from peeling off, the chuck/coil guide members 22a, 22
It is preferable that the corners of b be appropriately rounded. Also,
As shown in FIG. 6, the core segment 11 is attached to the chuck member 23 which rotates together with the spindle of the winding machine.
is held in the center of the yoke 12, and a pair of coil guide members 24a, 24b having the same shape as the chuck/coil guide members 22a, 22b are attached to the magnetic pole piece 13 side of the core segment 11, and the core The coil wire 20a can also be wound between the grooves 13b, 13b of the pole piece 13 by rotating the segment 11. In addition,
The coil guide member 25 may be of a fixed type as shown in FIG. According to this, the coil wire 20a is formed of a truncated cone having an opening of the core segment 11.
As the magnetic pole piece 13 rotates, it slides along the coil guide 25 and is introduced between the grooves 13b of the magnetic pole piece 13. On the other hand, as shown in FIG.
13b, or even between the 9th and 9th
As illustrated in the figure, a fixed chuck member 28
The core segment 11 is fixed with
It can also be wrapped around the proximal end of No. 3.

In this way, each core segment 11 has a coil wire 20
a is directly wound, and then the three core segments 11 are arranged in an annular shape so that the convex part 12a of the yoke fits into the concave part 12b of the other yoke, and the joint portions are formed, for example, by a suitable method. By fixing with adhesive, they are assembled into one body as shown in FIG. In addition, as illustrated in FIG. 11, there are protrusions 15° 1 protruding outward at the joint portions of each end of the yoke 12.
5 may be provided and the stator core 10 may be assembled by welding between these protrusions 15 and 15. Furthermore,
The convex portion 12a and the concave portion 12b may be a dovetail joint as shown in FIG.

As is clear from the above description of the embodiments, according to the present invention, it is possible to significantly improve the yield rate, and it is also possible to automatically wind the excitation coil around the magnetic pole piece using a simple method. This enables cost reduction and mass production of stator cores.

Although the above embodiment has been explained using a three-pole stator core as an example, this invention is applicable to a three-pole stator core (N is an integer of 2 or more).
Of course, it can also be applied to stator cores.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a stator core manufactured according to the present invention, Fig. 2 is a front view showing a core segment of the stator core, and Fig. 3 is a front view showing a core segment of the stator core manufactured by pressing a magnetic steel plate. A plan view showing a state in which a piece of the same shape is punched out, No. 4tJ! I is a plan view showing the state in which the coil wire is automatically wound around the core segment;
The figure is a schematic perspective view thereof, and FIGS. 6 to 9 are schematic perspective views showing other embodiments of the automatic coil wire winding means.
FIG. 10 is a plan view of a stator core assembly having an excitation coil, FIGS. 11 and 12 are enlarged views showing a modification of the joint portion of the core segment 11, and FIG.
FIG. 14 is a plan view showing a pole stator core, and is a plan view showing a state in which a piece, which is a component of the stator core, is punched out of a magnetic steel plate by a press or the like. In the figure, 10 is a stator core, 11 is a core segment, 1
2 is a yoke, 13 is a magnetic pole piece, 20 is an exciting coil, 20a
is the coil wire, and 21 is the spindle. 22a, 22b are chuck/coil guide members, 23 is a chuck member, and 24a, 24ai25, 26°27 are coil guide members. Patent applicant General Co., Ltd. Agent Patent attorney Takuya Ohara Figure 4

Claims (4)

[Claims] (1) A shape that includes an arcuate yoke having an arc angle of 360°/N (where N is an integer of 2 or more) and one magnetic pole piece that is integrally connected approximately at the center of the inner peripheral edge of the yoke. A step of punching out a piece from a magnetic steel plate such as a silicon steel plate by a press or the like, a step of stacking a predetermined number of the above pieces to form a core segment, and rotating the core segment around the bisector of the arc angle. a step of winding a coil wire around the proximal end side of the magnetic pole piece to wind an excitation coil while arranging the core segments, and arranging the N core segments in a ring, and bonding the ends of adjacent yokes with adhesive or A method for manufacturing a stator core, comprising a step of integrally joining the stator cores by welding or the like. (2) In claim (1), the core segment is held by a chuck/coil guide member through the tip side of the magnetic pole piece and rotated together with the member, and the coil wire is guided along the coil guide member. A method for manufacturing a stator core, characterized in that the stator core is guided to the base end side of the magnetic pole piece. (3) In claim (1), the core segment is held on the yoke side by a chuck member, and one side of the magnetic pole has a groove formed on the base end side of the magnetic pole piece to accommodate the coil wire. A method of manufacturing a stator core, comprising: a coil guide member for guiding the stator core. (4) The stator core according to claim (1), wherein the coil wire is guided to the base end of the magnetic pole piece through a guide pipe that is fixed or rotates around the bisector. manufacturing method.