JPS6212737B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a coreless armature. Conventionally, this type of coreless armature has an armature 1 made of a cylindrical coil, a plurality of segments c arranged on the upper surface, and a rotating shaft 2 protruding from the lower surface, as shown in Fig. 1. To connect the commutator 3 on the circular plate, the commutator 3 was inserted into the upper opening of the armature 1 made of a cylindrical coil, and the two were integrally bonded with an adhesive 4. However, in the ironless core type armature configured to be integrally connected via the adhesive 4 as described above, the bonding strength between the commutator 3 and the armature 1 consisting of a cylindrical coil is low, making it difficult to rotate at high speed. Not only is it difficult to withstand, but it also tends to cause damage to the rotating shaft 2 and armature 1, and it also has the drawbacks of poor dynamic balance due to variations in the amount of adhesive applied when joining them together, and large motor vibrations. I was getting used to it. The present invention has been made in view of these drawbacks.
The embodiments shown in FIGS. 2 to 5 will be explained below. FIG. 2 and FIGS. 3A and 3B show the manufacturing process of the iron-core type armature of the present invention. Reference numeral 11 denotes a substantially cylindrical core metal with a chamfer formed on the left end in the figure and a hole 11a penetrated through the center along the length direction. An armature 13 formed into a cylindrical coil having a twisted wire connection portion 12 is attached to the end of the winding wire. Reference numeral 14 denotes an insulating substrate 15 made of synthetic resin on a disk, a plurality of segments c (see FIG. 4) arranged on the upper surface of the insulating substrate 15, and transparent parts provided in a part of the segments c. The commutator is made up of a hole 16 and a rotating shaft 17 protruding from the center of the lower surface of the insulating substrate 15 via a boss, and the stranded wire connection portion 12 of the armature 13 is positioned and fitted into the through hole 16. The rotating shaft 17
is inserted into the hole 11a of the core metal 11. In addition,
In this case, since the end portion of the core bar 11 is formed in a tapered shape whose diameter gradually decreases toward the tip, this tapered portion, the vicinity of the outer periphery of the lower surface of the commutator 14 , and the inner surface of the armature 13, A vacant room 18 is defined. 19 is a first end face regulating ring disposed around the core bar 11 so as to come into contact with one end face 13' of the armature 13; 20 is a first end face regulating ring so as to come into contact with the other end face 13' of the armature 13; , is a second end face regulating ring disposed opposite to the first end face regulating ring 19 with a gap therebetween, and a center portion of the second end face regulating ring 20 is provided with a base portion of the core bar 11. A ring-shaped boss 20a whose diameter is slightly smaller than that of the armature 18 is protruded and whose tip abuts against the commutator 14 . Vacancy 2 due to the inner surface of
0 is partitioned. A die 22 has an arcuate inner surface and is disposed to cover the outer peripheral surface of the armature 13. However, in this state, the arrow Pz in Fig. 2
The armature 13 on which the commutator 14 is disposed is pressurized by a force in the direction, and then the armature 13 is pressurized by a force in the radial direction _Pr by a die 22 disposed around the armature 13. Therefore, as shown in FIG . and a cavity 2 formed at the end of the core bar 11
1.18, it gradually rises and overhangs,
In addition, as shown in FIG .
3b, the armature 13 and commutator 14 are completely clamped and mechanically coupled. At this time, since the stranded wire connection portion 12 of the armature 13 is fitted into the through hole 16 of the commutator, the soldered connection between the segment c and the armature 13 may be displaced during the crimping operation of the armature 13. This also prevents the cut end of the twisted wire connection portion 12 from bending inward into the cylinder of the armature 13 and coming into contact with the winding wire covered with the insulation coating, thereby preventing the insulation coating from being peeled off. Further, as described above, the armature 18 has both end surfaces 1
3′, 13″ are the first and second end face regulating rings 19,
20 restricts the elongation in the length direction, and the outer peripheral surface is pressurized by the die 22, so the gaps between the wires in the other coil parts of the armature 13 are crushed, and the armature made of high-density windings is 13 can be obtained. Next, although the manufacturing equipment is not shown, the twisted wire connection section 1
2 and the segment c of the commutator 14 are connected via the solder 23, and the other segments c and the armature 13
Solder 2 between the winding wires whose insulation coating has been peeled off.
4, 24, . . . , a coreless armature 25 as shown in FIG. 4 is obtained, and the coreless armature 25 forms a coreless motor as shown below. FIG. 5 shows a sectional view of a coreless motor using the ironless core type armature 25 of the present invention.
The ironless core type armature 25 of the present invention includes a cup-shaped yoke 26 made of a magnetic material, and a cylindrical permanent magnet fixed within the yoke 26 via a fixing member 27 at a distance from the inner peripheral surface of the yoke 26. It is disposed within the steater formed by 28. That is, the armature 13 effectively generates torque in the air gap 29 between the yoke 26 and the permanent magnet 28 that constitute the stator.
The commutator 14 is arranged such that a cylindrical coil of
The rotating shaft 17 is rotatably driven and supported by bearings 30, 30, and the brush 33 is fixed to a pair of terminals 32 implanted in a terminal plate 31 attached to the upper open end of the yoke 26. The terminal is slidably brought into elastic contact with the upper surface of the commutator 14 , and is configured to supply current to the armature winding. FIG. 6 shows a commutator 14 in which the through holes 16 are all drilled in each segment c as another embodiment of the present invention, and any one of the through holes 16 is selected to form a twisted wire connection section. 12 are fitted, so the workability is excellent. Since the method of manufacturing the iron core type armature of the present invention is as described above, it has the following effects. (a) A commutator is inserted into a predetermined position on the inner cylindrical surface of an armature consisting of a cylindrical coil, the outer cylindrical surface of the armature is pressurized through a die, and the winding wire of the coil is placed on the inner surface of the commutator. Since the projecting part is formed, the commutator is held between the projecting parts, and the commutator 14 is mechanically coupled to the armature, the mechanical coupling between the armature and the commutator is reduced. The strength is improved, eccentricity between the rotating shaft and armature is eliminated, dynamic balance is improved, motor vibration is reduced, and the motor can withstand high-speed rotation. (b) Since the armature and commutator are crimped and fixed after the stranded wire connections are fitted into the through holes of the segments, misalignment between the two may occur during the crimping process, resulting in damage to each segment and armature. This prevents failure of soldering connections. (c) Compared to the case where the stranded wire connection part is bent inward into the cylinder of the armature and held between the commutator plate, the stranded wire connection part is fused into the through hole, so the stranded wire connection part is The cut ends should not touch the winding strands covered with an insulating coating (that is, should not conduct electricity to the segments) and cause a rare short.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional ironless core type armature. 2 and 3 A and 3 are schematic diagrams showing the manufacturing process of the iron core type armature according to the present invention, FIG. 4 is a perspective view of the iron core type armature manufactured according to the present invention, and FIG. The figure is a sectional view of a coreless motor constructed using a coreless armature according to the present invention. FIG. 6 is a perspective view of a commutator showing another embodiment of the present invention. 11... Core metal, 11a... Hole, 12... Twisted wire connection portion, 13... 13a... Armature, 13b... Projection, 14... 14a... Commutator, 15... Insulating substrate, 16... Boss, 17... Rotating shaft, 18... Vacant room, 19... First end face regulating ring, 20... Second end face regulating ring, 20a... Boss, 21...
Vacant room, 22...Dice, 23...Solder, 24...
Solder, 25... Iron core type armature, 26... Yoke, 27... Fixed member, 28... Permanent magnet, 29
... air gap, 30 ... bearing, 31 ... terminal plate, 32
...terminal, 33...brush.

Claims (1)

[Claims] 1. A circular commutator segment having a through hole in the inner cylindrical surface of an armature formed in a cylindrical coil having a stranded wire connection portion at the end of the winding strand, which fits in position with the stranded wire connection portion. By positioning and inserting a plate-shaped current element and applying pressure to the armature in the radial direction from the armature outer cylindrical surface, the armature winding strands near the joint with the end face of the commutator are rectified. A method for manufacturing a iron-free core type armature, characterized in that the commutator and armature are mechanically joined through protrusions formed on both surfaces of the commutator, with the commutator protruding so as to be sandwiched therebetween. .