JPH03150063A - Coil assembly for pm type pulse motor - Google Patents

Abstract

PURPOSE:To improve occupying ratio in a coil disposing space without reducing an assembling efficiency by securing a self-fusion adhered copper wire as a coil wire, and covering the surface of a coil body with a resin layer. CONSTITUTION:A self-fusion adhesive copper wire is used as a coil wire in a coil 10a, and secured after winding. Thus, a bobbin for winding the coil wire is eliminated, and the coil 10a can be independently formed. Accordingly, a resin layer 10b covering the surface of the body 10 may electrically insulate the body 10a from a stator body 15 or 16. Thus, the thickness of the layer 10b is sufficiently reduced to form a coil assembly 10 having large coil wire occupying ratio. The ratio of the coil 10 in the coil disposing space of the bodies 15, 16 can be improved without reducing an assembling efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coil assembly used in a PM type pulse motor.

(Prior art) A ring-shaped coil assembly is arranged in a coil arrangement space surrounded by magnetic pole teeth and a yoke to form a magnetic circuit, and a rotor whose circumference is magnetized with a permanent magnet is rotated at the center of the ring-shaped coil assembly. a PM that is freely supported and causes the magnetic circuit to generate a rotating magnetic field to rotate the rotor;
type pulse motors are known. Such a PM type pulse motor is different from an HB type pulse motor in which a slot-structured magnetic pole tooth and yoke are formed by laminating magnetic sheet metal, and a magnetic circuit is formed by winding a coil wire around the outer periphery of the magnetic pole tooth. In comparison, it has a simple structure and is easy to assemble, so it is widely used as a pulse motor used in low torque and low speed areas.

5 and 6 show an exploded perspective view and a cross-sectional view of a PM type pulse motor, respectively. In FIGS. 5 and 6, stator members 1, 3, and 5.7 are formed by drawing magnetic sheet metal, It is formed by bending, and a plurality of magnetic pole teeth la, 3m, 5a, and 7a are formed along the inner periphery of each. In addition, yoke portions 1b, 3b, 5 of each stator member
b, 7b, stator members l and 5 and stator members 3 and 7 are formed in the same shape, respectively. That is, the magnetic pole teeth 3a, 7a
The stator members 3, 7 are provided with outer circumferential surfaces 3c, 7c facing each other, whereas the stator members l and 5 are not provided with such outer circumferential surfaces, and the yoke portions 1b, 5b of these stator members are It is formed into a disk shape.

The stator member 3 and 1. and 5 and 7
are combined to form a stator body 15.18, and a coil arrangement space 17.18 is formed inside each stator body 15.18. In addition, the outer peripheral surface 3c, ? c.
Engagement grooves 20 are formed at 120 degree intervals at the ends of the stator member 1.5, and engagement protrusions 21 that engage with these engagement grooves 20 are formed on the circumferential surfaces of the yoke portions lb and 5b of the stator member 1.5. has been done. Therefore, by engaging the engaging protrusion 21 with the engaging groove 20 and combining the stator members 3 and 1 and 5 and 7, respectively, the magnetic pole tooth 1a is assembled as shown in the detailed diagram of the magnetic pole tooth in FIG. 3a, 7a, and 5a are meshed with each other in a normal state with predetermined gaps between them. In addition, the magnetic pole tooth groups la and 3a arranged on the upper side and the magnetic pole tooth groups 5a and 7a arranged on the lower side
The pitch P is shifted by the pitch P, and the magnetic field generated by the upper magnetic circuit and the magnetic field generated by the lower magnetic circuit are shifted in phase by π12 in electrical angle.

These stator bodies 15. A bearing plate 4.8 is provided to support the rotor 9 so as to sandwich the rotor 9. These bearing plates 4, 8 have bearings 4a, 8 in the center.
a are attached respectively, and these bearings 4a, 8a
By pivotally supporting the rotating shaft 9a, the rotor 9 is rotatably supported at the center of the stator body s and ts.

Magnetic pole teeth 1a, 3a, 5a, ? Coil assemblies 2 and 6 are arranged in coil arrangement spaces 17 and 18, respectively, so as to surround a. As shown in FIG. 5, each coil assembly 2.6 has a coil body 2a, 8a formed by winding a coil wire around a synthetic resin pobbin 2b, 8b. When a current is passed through it, a magnetic field is generated.

As described above, the magnetic pole tooth groups 1a, 3a and the magnetic pole tooth group 5a,
The arrangement position is shifted from 7a by A period. Therefore, when alternating currents temporally shifted by X periods are passed through the coil assemblies 2 and 6, the sum of the circumferential components of the generated magnetic field becomes a rotating magnetic field.

On the other hand, the circumferential surface of the rotor 9, which faces the magnetic pole teeth 1a, 3a, 5a, and 7a, is divided and magnetized into alternating north and south poles in the circumferential direction. Therefore, the rotor 9 rotates in synchronization with the rotating magnetic field generated by supplying the drive current.

(Problems to be Solved by the Invention) The rotational force of the rotor 9 is proportional to the magnitude of the rotating magnetic field, and the magnitude of the rotating magnetic field is proportional to the number of turns of the coil. Therefore, in order to increase the rotational force of the rotor 9, Placement space 17.18
It is necessary to increase the proportion of the coil in the

As described above, the conventional coil assemblies 2 and 6 have coil wires wound around the pobbins 2b and 8b to form the coil main body 2a.
, which comprised 8a. Therefore, when the pobbins 2b and 8b are made of insulating synthetic resin, as shown in the cross-sectional view of FIG. ■ About 1 was necessary.

Therefore, the pobin 2 in the coil arrangement space 17.18
There was an inconvenience that the proportion occupied by b and Bb became large.

In addition, in order to prevent the coil bodies 2a and 8a from protruding from the flange even if there is a winding error, the coil wire could only be wound to a position about 1 inch inward from the outer periphery of the flange. . Therefore, in the conventional coil assembly, it is difficult to increase the proportion of the coil wire in the coil arrangement space.

Incidentally, the stator body 15, 16 is insulated, and the magnetic pole tooth groups 1a, 3a, 5a, ? By winding the coil wire directly around the outer periphery of a, the pobbins 2b and 8b can be eliminated, and the proportion occupied by the coil wire can be increased by the amount of the pobbins 2b and eb. However, in this case, the coil wire must be wound during the motor assembly process, resulting in a disadvantage that the efficiency of the assembly process is significantly reduced.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to improve the ratio of coils in the coil arrangement space without reducing the assembly work efficiency of a PMfi pulse motor.

(Means for Solving the Problems) In order to solve the above problems, the coil assembly for a pM type pulse motor of the present invention has a plurality of magnetic pole teeth 1a on the inner peripheral surface of J.
, 3a, 5a, 7a in order to generate a magnetic field for rotating the rotor 9 which is rotatably supported at the center of the ring-shaped stator body 15.18 in which the magnetic pole teeth 1a, 3a, 5a are formed. , P arranged in the coil arrangement space of the stator main body 15.18 so as to surround 7a.
A coil assembly for an M-type pulse motor includes a coil body 10a formed of a self-fused copper wire and formed into a circular shape by hardening the self-fused copper wire, the coil body 10a and the stator body 15. .18
A resin layer 10b is attached to the surface of the coil body 10a to insulate the coil assembly IO from the coil body 10a.

(Function) Self-fusing copper wire is used as a coil wire, and after winding, it is made into a circular shape. This eliminates the need for a bobbin for winding the coil wire, and allows the coil body 10a to be formed independently. Therefore, the resin layer 10b deposited on the surface of the coil body 10a only needs to electrically insulate the coil body 10a and the stator body 15 or 16, and the thickness of the resin layer 10b is made sufficiently thin to prevent the coil from coiling. Lines occupy a large proportion! ! It is now possible to configure a coil assembly with a coil arrangement space of 17.1 in the stator body.
It is possible to increase the proportion of coils in 8.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of a coil assembly for a PM type pulse motor of the present invention, and FIG. 2 is a sectional view.

The coil assembly 10 shown in FIGS. 1 and 2 is constructed by forming a resin layer 10b on the surface of a coil body 10a. The coil main body 10a of the embodiment is circular in a ring shape as shown in the figure. That is, a self-welding copper wire is used as the coil wire constituting the coil body IO, and is wound a predetermined number of times around a winding jig (not shown).

After winding, the wire is subjected to a hardening process such as heating or applying alcohol to form a circular shape, and then removed from the winding jig.

Since the coil main body 10a has already been formed and has a circular shape, the resin layer 10b that adheres to the surface of the coil main body 10a, that is, the resin layer 10b corresponding to the pobbins 2b and 8b in the conventional coil assembly 2.6, No large force such as winding force is applied to the coil body 1.
Since it is sufficient to use the resin layer ab to perform only the function of insulating the stator body 15.18 from the stator body 15.
．． It becomes possible to form a thin layer of about 3 fat layers.

Also. Since the coil body 10a is formed in advance and the flange portion is formed on the surface thereof by molding such as injection molding, the size of the coil body 10a can be formed to be as large as the size of the outer peripheral portion of the flange. Become. Therefore, these make it possible to configure a coil assembly 10 in which the proportion of the volume occupied by the coil main body 10a is very large.

Therefore, by arranging the coil assembly lO of the embodiment in the coil arrangement space of a PM pulse motor, the volume ratio of the coil main body lea in the coil arrangement space, that is, the space factor of the coil can be greatly improved. That is,
For example, in the cross-sectional view of FIG. 3 showing details of the magnetic circuit,
Radius W of coil arrangement space 17 = 10 layers 1. Height H = 5-
4 copies are 1. When a coil assembly that can be placed in such a coil placement space 17 was created using a coil wire with a copper wire diameter of 0.28 layers, the number of turns was 260 turns in conventional coil assemblies 2 and 6. . On the other hand, in the case of the coil assembly lO of the example, the number of turns is 3.
I was able to make it 20 turns. Therefore, if the coil assembly 10 of the embodiment is used, the coil arrangement space 17.
The space factor of the coil 18 can be improved by 1.2 times or more, and the rotational force of the rotor 9 can be significantly increased. Moreover, the motor can be assembled using the same procedure as in the case of using a conventional coil assembly, and there is no inconvenience that work efficiency during assembly is impaired.

In addition, when the resin layer 10b is applied to the surface of the coil body 10a, the resin layer 10b may be applied to a part of the surface, as shown in the perspective view of FIG.

In this way, heat dissipation will be improved, so the coil body 1
The temperature rise at 0a is suppressed.

<Effects of the Invention> As described above, the present invention provides a coil assembly disposed in the coil arrangement space of the stator body in a PM type pulse motor, which includes a circular coil body made of self-fused copper wire and the coil body. Since the coil is constructed with a resin layer adhered to the surface of the coil, the space factor of the coil in the coil arrangement space can be greatly increased. Therefore, the rotational force of the rotor can be significantly increased without impairing work efficiency during motor assembly or impairing insulation properties. Further, the size of the coil arrangement space required to obtain a predetermined rotational force can be reduced, and the PM type pulse motor can be downsized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a coil assembly showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the coil assembly, and FIG. 3 is a schematic diagram of a magnetic circuit showing a state in which the coil assembly of the embodiment is arranged. FIG. 4 is a perspective view of a coil assembly showing a different embodiment from FIG. 1; Figures 5 and 6 show the overall configuration of the PM type pulse motor, Figure 5 is an exploded perspective view, Figure 6 is a sectional view, and Figure 7 is details of the magnetic pole teeth in the PM type pulse motor. A diagram explaining. FIG. 8 is a sectional view of a main part of a magnetic circuit showing an example in which a conventional coil assembly is arranged in a coil arrangement space. la, 3a, 5a,? a - magnetic pole tooth, g-a-ta. lO...Coil assembly. 10a...Coil body, 10b...Resin layer. 15.18.--Stator body. 17.18...-Coil arrangement space. Patent applicant Oki Electric Industry Co., Ltd. Agent
Patent Attorney Funabashi Kuni Rules 910a 10b
3 3b (((, (Do-shi-w-21 Example a Magnetic tip circuit ((r0) Illu-up-begging complete support/-111\\ PM Crab and Luss motor Ql/X
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Claims (1)

[Claims] In order to generate a magnetic field that rotates a rotor rotatably supported at the center of a ring-shaped stator body having a plurality of magnetic pole teeth formed on its inner circumferential surface, a stator is provided that surrounds the magnetic pole teeth. In the coil assembly for a PM type pulse motor disposed in the coil arrangement space of the stator body, the coil body is formed of a self-fused copper wire and the self-fused copper wire is hardened to form a circular shape. A coil assembly for a PM pulse motor, comprising a resin layer deposited on the surface of the coil body to insulate the coil body and the stator body.