JPS6252543B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for forming a coil end of a flat motor having a gap in the axial direction.

The prior art will be explained with reference to FIGS. 1 and 2. The stator 1 shown in FIG. 1 is made by winding a magnet wire around a winding frame of a winding machine (not shown) to form two groups of coils having a predetermined shape and number of turns. The coil 2 is manufactured by manually storing the coil 2 in the slot 4 provided radially. Note that a slot insulator 5 is inserted into the slot 4 in advance, and after the coil 2 is housed, it is fixed with a wedge 6. In order to pass the shaft of the rotor through the inner diameter portion of the stator 1 , it is necessary to widen the inner diameter of the coil end 2a inside the stator core 3 to a diameter D as shown in FIG. Therefore, conventionally, a mandrel (not shown) having an outer diameter slightly larger than the diameter D was inserted into the inside of the stator 1 to spread it to the diameter D.

In this method, the inner side of the coil end 2a shown by the dotted line in FIG. 2 before forming is formed with a mandrel so that it has a diameter D, so that the inner and outer coil ends 2b of the stator core 3 become is pulled to. For this reason, the slot insulator 5 is also pulled in the same direction as the coil end 2b and deformed, and the stator core 3 and the coil end 2b come into contact, resulting in damage to the coil 2.

The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a flat shape with a gap in the axial direction, which improves the insulation reliability of the coil by preventing the deformation and damage of the slot insulator during coil end molding, and which also improves work efficiency. An object of the present invention is to provide a method and apparatus for forming coils of a motor.

Hereinafter, FIGS. 3 and 4 of one embodiment of the present invention will be described.
This will be explained with reference to the figures. FIG. 3 is a sectional view of an embodiment of a coil forming apparatus for a flat motor having an axial gap according to the present invention. ing.

A recess 8b is provided in the center of the lower mold 8 on the surface facing the upper mold 10 (hereinafter referred to as the upper surface of the lower mold), and this recess 8b
A mandrel 9 having an outer diameter slightly larger than the diameter D and tapered at the tip is fitted into the mandrel 9 and fixed with a bolt 12. Further, an annular guide groove 8a is provided on the upper surface of the body of the lower mold 8 and is concentric with the recess 8b for positioning the stator core 3. Furthermore, a plurality of pins 11 protruding toward the upper surface of the lower die 8 are implanted along the inner and outer side walls of the guide groove 8a. That is, this pin 11 is located inside the coil 2, near the slot 4 of the stator core 3 in which the coil 2 is housed, and near the folded surfaces at both ends of the slot insulator 5, in the positional relationship shown in FIGS. 3 and 4. , and is screwed to the lower mold 8 so that the height protruding from the surface of the lower mold 8 is approximately equal to the axial end surface of the stator core 3 housed in the guide groove 8a of the lower mold 8. On the other hand, the upper mold 10 has a through hole 1 in the center with the same diameter as the mandrel 9.
Drill 3. Further, on the lower surface of the upper mold 10 (the surface on the lower mold 8 side) in the body of the upper mold 10, there is an annular groove 10a concentric with the through hole 13 so that the stator core 3 and pins 11 do not come into contact with the upper mold 10. is provided. By drilling this annular groove 10a, protrusions 10b are formed on both edges of the annular groove 10a.

A forming operation using the coil forming apparatus for a flat motor configured as described above will be explained. A slot insulator 5 is inserted into the slot 4 of the stator core 3, and a stator 1 is formed by winding a generally fan-shaped coil 2 for one phase, for example, a U phase, into the slot insulator 5. Then, as shown in Fig. 4, the stator core 3
While aligning the outer side of the coil end 2a, which is the inner diameter side, along the mandrel 9, the inner periphery of the four corners of the substantially fan-shaped coil 2 rests on the outer side of the pin 11, and the tip of the pin 11 is aligned in the thickness direction of the coil ends 2a, 2b. The stator 1 is mounted on the lower mold 8 as shown in FIG. 3 with one axial end surface of the stator core 3 in contact with the bottom of the guide groove 8a so as to protrude from the side surface of the upper mold side.

Next, the through hole 13 of the upper mold 10 is inserted along the mandrel 9, and the annular groove 10a of the upper mold 10 is pressed while pressing the upper mold 10 with a press (not shown) and pressing the coil ends 2a, 2b with the protrusion 10b. When the pin 11 and the other axial end surface of the stator core 3 come into contact with the bottom, the pressing is stopped. Next, the upper mold 10 is removed, and the stator 1 is removed from the lower mold 8 to complete the molding operation. Subsequently, the V-phase and W-phase are also molded using their respective upper molds, completing the molding of all coil ends.

In this way, when forming the coil ends, the coil ends 2a and 2b are subjected to pressure by the protrusion 10b of the upper mold 10, and the inner periphery of the four corners of the coil 2 is in contact with the side of the pin 11 opposite to the stator core 3. The outer side of the coil end 2a, which is the inner diameter side of the coil end 2a, is regulated by the mandrel 9, and the tip of the pin 11 protrudes from the side surface of the upper mold side in the thickness direction of the coil ends 2a, 2b. For this reason, the coil ends 2a, 2
The shape of the coil end 2a is made into an arc and the inner diameter is reduced to prevent the magnet wire forming the pin 11 from passing over the tip of the pin 11 and being crushed by being pinched by the upper die, and from collapsing toward the stator core 3. It is molded to have a diameter of D, making it easier for the rotor shaft to pass through. or,
Due to the action of pin 11, coil 2 near slot 4
There is no need to forcefully pull the coil 2, and the four corners of the coil 2 near the slot 4 are formed parallel to the slot 4. Therefore, the slot insulator 5 is not deformed or damaged, and the coil 2 is also prevented from being damaged. Furthermore, the coil ends 2a and 2b are held down by the protrusion 10b of the upper mold 10, so that the coil ends 2
Since the heights of a and 2b can be formed to be lower than the axial end face of the stator core 3, the stator can be attached to a stator frame (not shown) without any problem.

Furthermore, if the upper mold 10 is fixed to the press head and the lower mold 8 is positioned at the center of the upper mold 10, automation and labor saving can be easily achieved.

As described above, according to the present invention, due to the synergistic action of the pin, mandrel, annular groove, etc., the magnet wire forming the coil end does not collapse toward the stator core, the inner circumference of the coil end becomes an arc, and the slot insulator There is no deformation or damage, and no coil scratches occur. This also has the effect of improving the insulation reliability of the flat motor.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flat motor with coils being stored in the stator core, FIG. 2 is a plan view of the stator core with coils being stored, and FIG. 3 is a flat motor forming apparatus of the present invention. The longitudinal front view and FIG. 4 are plan views showing the positional relationship between the pin and the coil according to the present invention. 1 ...Stator, 2...Coil, 2a...Inner coil end, 2b...Outer coil end, 3
...Stator core, 4...Slot, 5...Slot insulator, 7 ...Forming device, 8...Lower mold, 8a...
...Guide groove, 9...Mandrel, 10...Upper mold,
10a... annular groove, 10b... protrusion, 11...
pin.

Claims (1)

[Claims] 1. A coil is housed in slots provided radially on the surface of the annular core, and the annular core is positioned by fitting into the guide groove of the lower mold, and the inner periphery of the coil forming the coil end is positioned. After arranging the pins implanted in the lower die at the four corners and bringing the outer side of the coil end, which is the inner diameter side of the annular core, into contact with the mandrel, the upper die is fitted and slid onto the mandrel to remove the upper die. A method for forming a coil for a flat type motor, which is characterized in that the coil end is pressurized and formed by a protrusion until the tip of a pin comes into contact with an annular groove. 2. In a molding device that presses and molds the coil end of a coil housed in the slot of the iron core of a flat type motor having a gap in the axial direction using an upper mold and a lower mold, a recess is provided in the center of the lower mold and the coil end is fitted into the recess. a mandrel, a guide groove formed in an annular shape concentrically with the recess in the body on the upper surface of the lower mold; a plurality of pins implanted in the upper die, a through hole drilled in the center of the upper mold and fitted with the mandrel, and an annular ring drilled in the body on the lower surface of the upper mold concentrically with the through hole. 1. A coil forming device for a flat motor, comprising a groove and protrusions provided on both edges of the annular groove.