JPH0698512A - Armature for flat coreless dc motor - Google Patents

Abstract

PURPOSE:To improve workability while largely reducing cost by forming one- layer or two-layer wound annular ring-shaped coil in a petaloid shape or series- winding the coil by using a flat type electric wire and molding the coil with a resin. CONSTITUTION:A coil formed by winding a flat wire is composed of a winding- start lead-out conductor section 1a, a winding-end lead-out conductor section 1b and a conductor section 1c toward a center at the time of a petaloid disk armature corresponding to the armature of a three-phase coreless motor consisting of nine coils and twelve poles. A pair of discoid armatures manufacured by molding the petaloid coils with a resin have through-holes 2a, 2b, 2c for positioning, and the three disks are laminated while phase is displaced in the radial direction at a fixed mechanical angle. Accordingly, the motor, which is mass-produced easily, output torque of which is increased, which has high efficiency and cost of which is reduced, can be acquired.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] It is used as a power source for all industrial equipment that requires a flat configuration. For example, it is used as a power source for VCRs, hard disks, floppy disks, tape recorders, and the like.

[0002]

2. Description of the Related Art An armature is known in which a plurality of coils formed by winding a round magnet wire in a fan shape are radially arranged on a substrate and fixed to the substrate with an adhesive or the like. An armature is also known in which a coil wound with a round magnet wire is processed into a petal shape and these are stacked and fixed on a substrate with an adhesive.

[0003]

In an armature having a fan-shaped coil arranged radially, it is necessary to increase the number of coils when making a multi-pole motor, which not only increases the cost but also improves workability. Becomes worse. In addition, the number of connection parts due to soldering and the like will inevitably increase, and therefore reliability will also decrease. Further, in an armature in which a coil using a round wire is processed into a petal shape, workability is poor, and in addition, it becomes difficult to perform aligned winding, and the space factor of the conductor is reduced.

[0004]

[Means for Solving the Problems] First Means By using a rectangular wire, the wire bundle does not collapse even when it is bent in the thickness direction of the rectangular wire. Therefore, not only the workability is improved, but also in this step. The defect rate is reduced. It is also easy to directly wind the petals. Second Means By providing a through hole for phase determination in a resin portion of a disk formed by resin-molding a processed petal-shaped coil, a multi-phase armature can be configured with high accuracy and easily. Third means Even in the case of a multi-pole electric motor, in a known armature in which fan-shaped coils are arranged radially, the number of fan-shaped coils must be increased, resulting in an increase in cost. However, in the case of the configuration of the present invention, the number of petals only increases and the number of coils does not change. Therefore, it is possible to significantly reduce the cost.
Fourth Means It is extremely easy to substantially increase the number of windings by stacking the disks at the in-phase position and connecting the coil ends in series or in parallel. Moreover, it is possible to eliminate variations in the magnetic characteristics of the coils between the phases. Fifth means In a three-layer, three-phase armature, there is very little variation in the magnetic characteristics of the coils between the phases, but as a means to solve this, use two field magnets on the ring to face each other. Therefore, the variation can be further reduced.

[0005]

In the conventional flat coreless DC motor petaloid armature, when a plurality of petaloid armatures are constructed, each coil is displaced in phase in the radial direction at a predetermined mechanical angle, and then each coil is displaced. Fix the coil side to the substrate. At this time, the phase angle accuracy varies greatly. In addition, it is very difficult to improve the parallelism accuracy of the coil side that contributes to the torque. According to the means of the present invention, it is possible to assemble with high precision and easily by stacking layers by displacing the phase at a predetermined mechanical angle in the radial direction with reference to the through hole and the center hole. In addition, the parallelism of each coil side is extremely uniform because the resin-molded disks are laminated. It should be noted that it is easy to understand that the space factor is improved because the coil is formed by arranging rectangular wires in line.

[0006]

Embodiments of the present invention will be described in detail with reference to FIG. Incidentally, the following figures show an example of a well-known fan-shaped radial arrangement of armatures constituted by the petal-shaped disc armature of the present invention so as to correspond to an armature of a 9-coil 12-pole 3-phase coreless motor. Is. FIG. 1 is a diagram of a single coil obtained by molding a coil formed by winding a rectangular wire into a petal shape. Reference numeral 1a denotes a lead wire portion at the beginning of winding and 1b denotes a lead wire portion at the end of winding. Reference numeral 1c represents a coil side that contributes to torque in a conductor portion toward the center. FIG. 2 shows a disc-shaped one-phase armature formed by resin-molding the petal-shaped coil of FIG. 1, and 2a, 2b, and 2c show through holes for phase determination.
The through holes are arranged in the same division on a concentric circle. 2d shows a central hole. A dotted portion 2e in the figure indicates a resin portion mold. FIG. 3 is a diagram showing an arrangement of coil portion conductors when the three discs of FIG. 2 are laminated with a predetermined mechanical angle and a phase shift in the radial direction. In the figure, the conductor connecting portion is omitted. In the figure, 3a is a U-phase coil 3b, 3c
Indicates a V-phase coil and a W-phase coil, respectively. Reference numeral 3d indicates a substrate of soft magnetic material, and 3e indicates a connecting portion to an armature current control device for controlling the armature current.

FIG. 4 shows the above

FIG. 6 is a schematic diagram for explaining the contents described in the section of the fourth means. In the figure, 4a is a rotor portion, 4b is a magnetic path plate, U1 and U2 are disks that are connected in series or in parallel to form a U phase, and V1 and
The same applies to V2, W1 and W2.

FIG. 5 shows the above.

FIG. 5 is a schematic diagram for explaining the contents described in the section of fifth means. Reference numerals 5a and 5b in the figure denote rotary magnets, which are opposed to each other with opposite magnetic poles. Reference numerals 5u, 5v, and 5w denote U-phase, V-phase, and W-phase disks. 5e and 5f show magnetic path plates.

FIG. 6 is a chart showing characteristics of an embodiment of a flat ares three-phase DC motor constructed by using the armature of the present invention. The parameters are as follows: Armature disc coil thickness ・ ・ ・ 1m / m (3 layers) Coil outer diameter ・ ・ ・ φ48 Coil inner diameter ・ ・ ・ φ18 Rotor magnet ・ ・ ・ φ46Xφ28Xt
2,2.6KG, 12P Motor thickness ・ ・ ・ 5m / m Torque constant ・ ・ ・ 140 gcm / A DC resistance ・ ・ ・ 3.75Ω Working voltage ・ ・ ・ 4.5V

[0010]

EFFECT OF THE INVENTION First Effect A mass-produced electric motor having a large output torque, high efficiency and a low cost can be obtained. Second Effect Compared to the armature of the conventional coreless flat type DC motor, the number of solder connection points is small and the reliability is improved. Third Effect It is possible to provide a motor with a high degree of uniformity by minimizing the variation in characteristics due to the armature of the motor. Fourth Effect Variations in motor characteristics due to variations in magnets are reduced by the omnidirectional integration effect. Fifth Effect Even for a multi-pole electric motor, it is not necessary to increase the number of coils, and an inexpensive and inexpensive armature can be configured easily.

[0011]

[Brief description of drawings]

FIG. 1 Shape diagram of a petal-shaped coil

FIG. 2 is a resin-molded disk-shaped single-phase armature coil.

FIG. 3 is an explanatory diagram of a configuration of an armature for obtaining a three-phase electric motor.

FIG. 4 is an explanatory diagram of magnetic path constituent elements.

FIG. 5 is an explanatory diagram of magnetic path constituent elements.

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[Procedure amendment]

[Submission date] August 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Added

[Correction content]

FIG. 6 Characteristics of Example

Claims (4)

[Claims] 1. A flat one-phase or multi-phase magnet rotor having an annular field magnet, and an armature current control device for controlling the armature current by detecting the position of a field magnetic pole of the rotor. In the brushless DC motor armature, a disk-shaped armature is formed by resin-molding an annular coil formed by winding one or two layers using a flat electric wire in a petal shape. 2. A multi-phase armature in which a plurality of armature coils according to claim 1 are laminated and the phases are shifted in the radial direction by a predetermined mechanical angle to form a single body. 3. An armature in which the armature coil according to claim 1, which is not resin-molded, is bonded to a substrate while being out of phase. 4. The resin mold disk according to claim 1, wherein
The armature according to claim 1, wherein a plurality of positioning through holes are arranged in the resin portion on a concentric circle and at equal division angles.