JP3493311B2 - Armature coil for molded rotor of coreless motor and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature coil for a molded rotor of a coreless motor, and more particularly to a rotor integrally formed of plastic resin.

[0002]

2. Description of the Related Art Conventionally, an armature coil of a small motor has a coil wire wound laterally n times around the axis, and is superposed on the coil wire laterally n-1.
It was wound (or horizontally n times) and wound vertically m times, and the cross section was wound so as to be approximately horizontal n × vertical m. FIG. 5 shows a cross section of such a conventional armature coil.
In FIG. 5, R is a rotor. K is a rotating shaft of the rotor R, C is a circuit board, and C1 and C2 are armature coils mounted on the circuit board C. J is a plastic resin that is integrally molded to form the rotor R.

[0003]

However, in the armature coil configured as described above, the adjacent armature coils are arranged as close as possible to each other on the circuit board in order to improve the performance. Therefore, the resin passage is thin, There was a problem that the plastic resin in the outer peripheral portion did not pass through to the central portion and the central portion became rough, and in particular the rotating shaft could not be held securely. further,
If the armature coil is arranged as close as possible to the outer circumference of the rotor, there is a problem that the outer circumference of the resin is difficult to connect and burrs are produced. For this reason, in order to secure the portion through which the resin on the center side flows and the portion through which the resin on the outer diameter side flows, the armature coil is inevitably made small, which is not preferable.

An object of the present invention is to ensure a plastic resin passage even if adjacent armature coils are arranged as close as possible to each other on a circuit board, and even if they are arranged as close as possible to the outer periphery of the rotor, and the outer peripheral portion is secured. By ensuring that the plastic resin passes through to the central portion and the plastic resin also spreads to the outside of the armature coil, a rotor having an armature coil without performance deterioration is provided.

[0005]

The above-mentioned problem is solved by claim 1.
As in the invention described in 1), it is placed on a circuit board and electrically connected.
After that, in the molded rotor armature coil of the coreless motor that forms the rotor by resin molding, the inner portion in which the coil wire is wound at least one row over the entire width, and the resin
The width of the outer row of the inner portion is
Comprising <br/> an outer portion wound predetermined sequence wound to be smaller than the serial full width can be achieved by Rukoto. In addition, the above-mentioned rotor battery
The manufacturing method of the armature coil is the same as the invention according to claim 2.
, The method of manufacturing a rotor armature coil, and at least one row of winding the coil wire over the whole width in winding core the collector
A first step of forming the inner part of the armature coil , and
Attach the movable flange of the coil winding device to the outer circumference of this inner part.
Move to a predetermined position, and outside the inner part the full width
Before winding the coil wire in the specified row only in the specified width that is smaller
It can be achieved by a and a second step of forming an outer portion of the serial armature coils.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an outline of a rotor on which an armature coil of the present invention is mounted. FIG. 2 is a plan view of the rotor, and FIG. 1 is a sectional view taken along line AB. FIG. 3 is a schematic perspective view showing an armature coil winding device. FIG. 4 is an enlarged sectional view showing a reel portion of the armature coil winding device. Figure 1
Therefore, in FIG. 4, reference numeral 1 denotes a rotor integrally molded of plastic resin. Reference numeral 2 denotes a rotary shaft having at least one end held by a rotary bearing (not shown) and rotating together with the rotor 1. Reference numeral 3 denotes a circuit board arranged orthogonally with the rotary shaft 2 passing through a central through hole. Reference numerals 4, 5 and 6 denote armature coils arranged on this circuit board. Although three armature coils are arranged in the example shown in FIG. 2, one to several pieces are arranged according to the characteristics of the motor. Reference numeral 7 denotes a plastic resin, which is fitted into a mold and is flowed with the plastic resin to be integrally molded to form the rotor 1. Now, a case where a plastic resin is flowed to form a rotor using the armature coil shown in FIG. 1 will be described. The armature coils 4, 5 (6) are arranged on the circuit board 3 as close to each other as possible.
The lower outer periphery of 5 (6) is not wound several times. For this reason, for example, the adjacent armature coils 4 and 5 are as close as possible to each other, but the portions where the coil wires are not wound face each other to form the plastic resin passage 8. The plastic resin is sufficiently supplied from the outer peripheral portion to the central portion through the passage 8. In the example of FIG. 1, the outermost 1
Although the example in which the row is not wound in three stages is shown, it is also possible not to wind two or three rows from the outer circumference in several stages.

Next, the armature coils 4, 5 and 6 in which the coil wire is not partially wound in this manner will be described in detail with reference to FIGS. 3 and 4 including the manufacturing method thereof. FIG. 3 is a perspective view showing an outline of a coil winding device. In FIG. 3, reference numeral 9 denotes a coil wire bobbin around which a coil wire 10 is wound, and a coil wire having a predetermined thickness is wound around the coil wire bobbin. Guide rollers 11, 12, 13 guide the coil wire 10 to a bobbin 16 for winding the coil. Reference numeral 14 is a drive motor, which is a rotary shaft 15.
The take-up bobbin 16 fixedly attached to is rotated by a predetermined number of turns.

FIG. 4 is an enlarged sectional view of the winding bobbin 16.
Reference numeral 15 is a rotary shaft that is rotated by the drive motor 14 described above. 1
A movable flange 7 is fixed to the rotary shaft 15.
The method of fixing the movable flange 17 is, for example, the rotating shaft 15
A male screw may be cut on the outer circumference of the movable flange 17 and a female screw may be cut on the movable flange 17 and screwed to a predetermined position, or a separate fixing device may be provided. Reference numeral 18 denotes a winding core that is inserted into the rotary shaft 15 next to the movable flange 17 and is fitted in the armature coil 4, depending on the shape of the outer circumference of the winding core 18.
The shapes of 5 and 6 are determined. The winding core 18 is configured to be slidable with respect to the rotating shaft 15 and fixed in the rotating direction so as to rotate integrally with the rotating shaft 15. As a method of slidably fixing the rotation direction, for example, the rotating shaft 15 may be a prism and the inner wall of the winding core 18 may be a rectangular tube of the same shape, or the side surfaces of the winding core 18 may be formed on both sides. There are methods such as sandwiching and fixing with a flange.

Next, the outer bobbin 16 is fixed by fitting the outer flange 19 and tightening the chuck portion 19a with the chuck screw 20. As the first step, the tip of the coil wire is fixed to the winding bobbin 16 and the motor 14 is driven to wind the coil over the entire width of the winding core. Then, after winding a predetermined number of turns, the movable flange 17 is slid to the position of the chain line, and the second step is started. By driving the motor 14 again, the coil is wound by a predetermined width. In the armature coils 4, 5, 6 thus formed, the coil is wound over the entire width in the portion wound in the first step, that is, the inner portion, but only the predetermined portion is wound in the outer peripheral portion in the second step. You can make narrow ones that are not rolled. That is, in the cross-sectional shape shown in FIG. 4, a portion indicated by a cutout is formed. When the armature coils 4, 5, 6 have been wound, the outer flange 19 is removed and the armature coils 4, 5, 6 are removed. When the armature coils 4, 5 and 6 are arranged on the circuit board 3, the passage 8 of the plastic resin 7 is formed as shown in FIG.

[0010]

As described above, according to the present invention, the passage of the plastic resin can be secured by forming the predetermined portion on the outer periphery of the armature coil in which the coil wire is not wound. Since the plastic resin passage is formed, the resin is surely passed to the central portion when integrally molded, and the rotary shaft is surely supported by the mold. Furthermore, since a resin passage is secured on the outer peripheral side of the armature coil and the resin turns reliably, even if the armature coil is arranged to the full outer diameter of the rotor, a part of the outer side of the armature coil is short-molded. It does not occur, and therefore there is no burr. Therefore, the torque can be secured and the characteristics are improved.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a rotor on which an armature coil of the present invention is mounted.

FIG. 2 is a plan view of a rotor.

FIG. 3 is a schematic perspective view showing a coil winding device.

FIG. 4 is an enlarged sectional view showing a reel portion of the coil winding device.

FIG. 5 is a sectional view showing a conventional armature coil.

[Explanation of symbols]

1 rotor 2 rotation axes 3 circuit board 4,5 armature coil 7 resin 8 passages 9 bobbins 10 coil wire 11, 12, 13 Guide roller 14 Drive motor 16 winding bobbin 17 Movable flange 18 winding core

Claims (2)

(57) [Claims] 1. A resin-made resin after being placed on a circuit board and electrically connected.
In forming the armature coil rotor coreless motor forming the rotor by form, is small coil wire over the entire width
Even if there is an inner part that is wound in one row and a resin passage part
So that the width of the outer row of the inner part is less than the full width
An armature coil for a molded rotor, comprising an outer portion wound in a predetermined row so as to be small . 2. A method of manufacturing a rotor armature coils, a first step of at least one row winding <br/> turn the coil wire over the whole width in winding core to form an inner portion of said armature coil, further, Place the movable flange of the coil winding device inside this
Move the outer circumference of the minute to a predetermined position, and
Predetermine the coil wire only in a predetermined width that is smaller than the full width
A second step of forming an outer portion of the armature coil in a row winding manner.