JPH0572185B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a thin DC motor that can be used in a limited storage space, and in particular, the present invention relates to a thin DC motor that can be used in a limited storage space, and in particular, a thin DC motor that includes a disc-shaped armature core, a plurality of coil windings, and a shaft. The present invention relates to a thin DC motor equipped with an armature having the following characteristics.

(Prior Art) This type of thin DC motor is used in various fields. In these fields, the motor is desired to be small in size and to have a high torque output. For example, with regard to motors that are placed inside automobile doors to drive power window devices, rapid advances are being made in designs that reduce the thickness of the door, resulting in a reduction in the output of the devices placed inside the door. Therefore, the dimension of the door in the thickness direction must be reduced.

As one of the conventional thin DC motors of this type,
Some armatures include a so-called disc-shaped armature core and a coil winding made of a printed circuit on the outer surface of the armature core. However, in printed circuits, the number of turns in one coil winding is limited (because the coil windings cannot be stacked). As a result, the magnetic flux generated by the coil windings decreases, resulting in a decrease in the output of the motor, and the impedance of the motor decreases, causing problems in that it can only be applied when the operating voltage is low.

Further, as a device that addresses this problem, there is a thin DC motor disclosed in US Pat. No. 3,315,106. In this method, a large number of radial slots are formed in a disc-shaped armature core, which are connected to each other at the inner end, and the coil windings are wound using spaced pairs of these slots, thereby forming a turn in each coil winding. There are many. However, since the coil windings are arranged spirally, the electric power conversion efficiency is not good, and since the coil windings pass through the slots, it takes time to wind the coil windings. Because the work requires caution,
The problem is that it is not suitable for mass production.

(Problems to be Solved by the Invention) The present invention provides a thin DC motor equipped with an armature having a disc-shaped armature core, a plurality of coil windings, and a shaft. The technical problem is to provide high output power, high efficiency, and easy formation of coil windings.

(Means for Solving the Problems) A thin DC motor of the present invention includes an armature,
It has a pair of field plates. The armature has a disc-shaped armature core, a plurality of coil windings, and a shaft, and each of the coil windings runs from a certain point on the outer circumference of the armature core to the front surface of the armature core through the vicinity of the center, and then extends from a certain point on the outer circumference to the outer circumference through the vicinity of the center. The shaft is fixed to the center of the armature core, extending toward another point on the armature, and then wrapping around the back of the armature in the same manner. The pair of field plates each have a sector-shaped magnetic pole and are arranged to sandwich the armature from both sides in the axial direction with a predetermined gap between them. The armature core is composed of a plurality of ring-shaped members concentrically assembled inside and outside, and an insulating member filled in a joint surface between the ring-shaped members.

(Function) In the thin DC motor of the present invention, since the coil windings are wound around and fixed to the armature core, the number of turns in each coil winding can be increased compared to a printed circuit, resulting in high output. be able to.

The armature has a disc-shaped armature core, a plurality of coil windings, and a shaft,
Each of the coil windings extends from a point on the outer circumferential edge of the armature core over the front side of the armature core through the vicinity of the center toward another point on the outer circumferential edge, and then similarly on the back side. The shaft is fixed to the center of the armature core, and the pair of field plates each have a fan-shaped magnetic pole and are arranged to sandwich the armature from both sides in the axial direction with a predetermined gap between them. Since almost all of the magnetic flux generated by the magnetic poles can effectively pass through the coil winding, efficiency can be improved and the coil winding can be easily formed.

Furthermore, since the armature core is composed of a plurality of ring-shaped members concentrically combined inside and outside and an insulating member filled in the joint surface between the ring-shaped members, eddy current loss in the armature can be effectively reduced. can be reduced, thereby increasing efficiency.

(Example) An example of the present invention is shown in FIGS. 1 to 3. This embodiment includes an armature 13A, a pair of field plates 1 and 2, a commutator 7, and a brush member 11, as shown in FIG.

The armature 13A includes a disc-shaped armature core 5 made of a soft magnetic material, a plurality of coil windings 6, and a shaft 8. The shaft 8 is fitted into and fixed to a hole formed in the center of the armature core 5. Each of the coil windings 6 extends from a certain point on the outer peripheral end of the armature core 5 over the front surface of the armature core 5 through the vicinity of the center toward another point on the outer peripheral end, and then extends over the rear surface 16 at the same point. It is wound so that it extends like this.

As shown in FIG. 2, the coil winding 6 is formed into a predetermined shape in advance and fitted into the armature core 5, and can be manufactured using a simple manufacturing method and manufacturing process.

The field plates 1 and 2 each have fan-shaped magnetic poles 3 and 4, and each has a center hole 9 that serves as a bearing for the shaft 8. It is fixed at both ends of the In the assembled state of this embodiment, the field plates 1 and 2 sandwich the armature 13A from both sides in the axial direction with a predetermined gap, and the armature 13A and the field plates 1 and 2 are parallel to each other, and the magnetic poles 3 and 4 The magnetic flux flow is perpendicular to the front side 15 and the back side of the armature core 5.

A commutator 7 is disposed on the shaft 8 of the armature 13A. This comyutaita 7
is connected to a plurality of coil windings 6, passes through the field plate 2, and faces the brush member 11. Electric power is selectively supplied to the plurality of coil windings 6 by the brush member 11 and the commutator 7. cover 12
covers the brush member 11.

In the embodiment described above, the number of turns of the coil winding 6 can be increased, and high output can be achieved. Furthermore, almost all of the magnetic flux generated by the magnetic poles 3 and 4 can effectively pass through the coil windings, resulting in good efficiency. Furthermore, the coil winding 6 can be manufactured using a simple manufacturing method and manufacturing process.

Although FIG. 3 shows the winding pattern of the coil winding in the armature 13A, the winding pattern is not limited to this.

4 to 9 and 12 show armatures 13B of other embodiments of the present invention. In this embodiment, as shown in FIG.
By providing a plurality of grooves 19 on the outer peripheral end of the armature 13B and locating the coil winding 33 in these grooves, as shown in FIG. The company is trying to make itself more compact. The grooves 19 at the outer peripheral end of the armature core 32 are provided symmetrically with respect to the center of the armature core, and each of the plurality of coil windings 33 is located within a pair of grooves located at symmetrical positions (the fifth
(See Figure 8). Therefore, the coil winding 33 is
It can be manufactured using a simple manufacturing method and manufacturing process. Since the center of the armature core 32 is covered with the coil winding 33, the shafts 20, 21 are glued onto the coil winding 33 with adhesive 22, as shown in FIGS. It is fixed at 32. The armature core 32, coil winding 33, and end portions of the shafts 20 and 21 on the armature core side are covered and integrated with a case 28 made of a highly rigid non-magnetic material. As shown in FIG. 5, each of the coil windings 33 has an end 30 that is connected to a cut groove in the winding guide 24 of the shaft 20 (similar to the winding guide 25 of the shaft 21). is connected to a commutator (which may be the same as shown in FIG. 1).

FIG. 6 schematically shows the flow of lines of magnetic force of magnetic flux generated by magnetic poles arranged on the field plate. The flow of magnetic lines of magnetic flux is in armature core 3
When the armature core rotates, the coil windings traverse the magnetic lines of force as much as possible, generating high torque.

Although FIG. 9 shows the winding pattern of the coil winding in the armature 13B, the winding pattern is not limited to this.

FIG. 10 and FIG. 11 show a thin DC motor according to the present invention and a conventional thin DC motor, respectively, and compare the external dimensions of the two. It is assumed that both generate the same output torque.

The two types of magnetic flux patterns in the armature core of the thin DC motor explained above are the 13th
As shown in the figure. One pattern is indicated by arrow A indicating the flow of magnetic flux running perpendicular to the plane of the armature core, and the other pattern is indicated by arrow B indicating the flow of magnetic flux running in the circumferential direction of the armature core. has been done.
The amount of magnetic flux generated during rotation of the armature core changes continuously, thereby causing eddy current losses. It is desirable to reduce this eddy current loss and increase efficiency.

The armature core of the present invention (the armature core 5 of one embodiment and the armature core 32 of another embodiment) of the present invention will be described with reference to FIGS. 14 and 15. The armature core of the illustrated embodiment is
It is composed of a plurality of metal thin plates 150, and each thin plate is connected to a plurality of silicon steel rings 160, 161, 162, 163.
It is formed by. The number of thin plates 150 is set in accordance with the size of the motor and the desired torque. A center hole 151 is formed in the center ring 163 for receiving the shaft of the armature.

Rings 160, 161, 162, and 163 are thinly coated with an insulating material such as epoxy resin, so that each ring is electrically insulated from each other.

Figure 16 shows the N formed on the field plate.
It shows the direction of magnetic flux flowing through the poles, south poles, and armature core. FIG. 17 shows eddy currents caused by magnetic flux flowing along the circumference of the armature core. FIG. 18 shows eddy currents caused by magnetic flux flowing in a direction perpendicular to the armature core.

A significant reduction in eddy current losses was achieved when using armature cores constructed according to FIGS. 14 and 15. Each lamella 150 and each ring of the armature core is actually divided into segments, which have a high electrical resistance due to the narrow current path.

Figure 19 shows the eddy current loss a generated in an armature core made up of a plurality of plain thin plates, and the eddy current loss a generated in an armature core made up of a plurality of thin plates each formed of a plurality of rings. A graph is shown to compare and display the current loss.
As is clear from the same graph, when the armature core is formed of a plurality of rings according to the present invention, eddy current loss can be significantly reduced. In other words, by using an armature core constructed by laminating thin plates each having a plurality of rings, an armature can be obtained which effectively reduces the flow of eddy currents and increases the efficiency of the motor.

FIG. 20 shows rings 160, 161, 162,
163 in detail. As seen in the figure, each ring is provided with a plurality of positioning lugs or protrusions 210.
The positioning projections 210 are arranged to maintain a minimum gap between adjacent rings, and then filled with resin. The resin binds the rings together into thin sheets and acts as an adhesive to bond a plurality of such sheets together into a unitary structure. FIG. 21 shows a gap 2 formed between rings that are close to each other due to the presence of the protrusion 210.
11 is shown. As seen in the figure, the void 211
is filled with resin 212. Furthermore, the entire armature core may be formed using resin in such a manner as to surround the armature core, in which case complete filling of the void 211 by the resin is ensured.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide a thin DC motor that has high output and high efficiency, and is also easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of the present invention;
The figure is an exploded view of the armature core and coil winding in one embodiment, FIG. 3 is a diagram showing the winding pattern of the coil winding in one embodiment, FIG. 4 is a perspective view of the armature core in another embodiment, and FIG. 5 is a perspective view of a state in which a coil winding is wound around an armature core in another embodiment, FIG. 6 is a diagram showing the flow of lines of magnetic flux passing through the coil winding in another embodiment, and FIG. FIG. 8 is an exploded perspective view of the armature in another embodiment. FIG. 9 is a diagram showing the winding pattern of the coil winding in another embodiment. FIG. 10 is the outline of the thin DC motor of the present invention. FIG. 11 is a diagram showing the external shape of a conventional motor that generates the same torque as the motor in FIG. Figure 13 is a diagram showing the flow direction of magnetic flux flowing through the armature core, Figure 14 is an exploded perspective view of a thin plate (for armature core formation) formed by multiple rings, and Figure 15 is a stacking of thin plates formed by multiple rings. Fig. 16 is a diagram showing the N and S poles of the field plate and the direction of magnetic flux flowing through the armature core, and Fig. 17 is a diagram showing the eddy current generated by the flow of magnetic flux along the circumference of the armature core. Figure 18 is a diagram showing the flow direction of eddy currents generated by the flow of magnetic flux perpendicular to the armature core, and Figure 19 is a diagram showing the armature core made of laminated plain thin plates, each of which has a plurality of A diagram showing the difference in eddy current loss between a ring and an armature core formed by laminating a plurality of thin plates, FIG. 20 is a perspective view of one ring, and FIG. 21 is a diagram showing the gap formed between the rings and FIG. 3 is a diagram showing an insulating member filled in the void. 1, 2... Field plate, 3, 4... Magnetic pole, 13A, 13B... Armature, 5, 32
... Armature core, 6, 33 ... Coil winding, 8, 20, 21 ... Shaft, 28 ... Case, 160 to 163 ... Ring (ring-shaped member),
210...Protrusion (gap member), 211...Gap,
212...Resin (insulating member).

Claims (1)

[Claims] 1. A thin DC motor having armatures 13A, 13B and a pair of field plates 1, 2, wherein the armatures 13A, 13B include disc-shaped armature cores 5, 32 and a plurality of coil windings. 6,3
3 and shafts 8, 20, 21, each of the coil windings 6, 33 extends from a certain point on the outer peripheral end of the armature core 5, 32 to the front surface of the armature core 5, 32 through the vicinity of the center of the outer periphery. The shafts 8, 20, 21 are fixed to the center of the armature cores 5, 32, and the shafts 8, 20, 21 are fixed to the center of the armature cores 5, 32. The field plates 1, 2 have fan-shaped magnetic poles 3, 4, respectively, and the armatures 13A,
The armature cores 5 and 32 are arranged to sandwich the armature core 13B from both sides in the axial direction with a predetermined gap between them.
62, 163 and an insulating member 212 filled in the joint surface between the ring-shaped members. 2 Ring-shaped members 160, 161, 162, 16
3 is a gap member 21 for forming a gap in the joint surface.
0, and the gap is filled with an insulating member 212. The thin DC motor according to claim 1.