JPS61164449A - Ad servo-motor - Google Patents

Abstract

PURPOSE:To generate high output, by fitting a plurality of disc-shaped stators laminating a plurality of eddy-shaped windings so that the circumferential sections may be thin and wide, on a housing, and by fitting disc-shaped magnets with thin shaft core sections and thick circumferential sections between the stators, on a rotary shaft. CONSTITUTION:A plurality (four units as shown in the figure) of disc-shaped stators 11 are fitted on a housing 13. Disc-shaped rotors 12 are alternately arranged in the axial direction between the stators 11, and are fitted on a rotor shaft 14. A plurality of eddy-shaped coils 17 are arranged in the circumferential direction by the stators 11, and each coil 17 made wide on the circumferential section is laminated in a plurality of pieces, and the laminated pieces are made thinner on the circumferential sections. The disc-shaped rotors 12 are made thinner on shaft core sections, and are fixed on the rotor shaft 14 via a base member 15. In this manner, the spacing of eddy-shaped conductors 18 on the central section side is arranged to be almost same as that on the outer peripheral section side, and the space factor of the conductors is heightened at the maximum, and the contour is kept as it is and output torque can be increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an AC servo motor, and more specifically, the present invention relates to an AC servo motor, and more specifically, a laminated plurality of winding layers each having a plurality of spiral conductors arranged circumferentially within a plane. The present invention relates to an improvement of an AC servo motor having a disc-shaped stator formed by the above method.

[Conventional technology and problems]

Conventionally, one or more disk-shaped stators are installed at appropriate intervals in the axial direction, and between the stators,
A disc-shaped brushless AC servo motor is known, which has a disc-shaped rotor in which multi-pole magnetized permanent magnets are arranged circumferentially and coaxially and rotatably arranged with a gap in the axial direction. There is.

In this type of AC servo motor, the disk-shaped stator is usually formed by arranging multiple spiral conductors circumferentially within a plane to form a winding layer, and then stacking multiple winding layers. be done. Since this disk-shaped stator has no iron core, it can efficiently pass the magnetic flux of the permanent magnets, and the conductor density of the windings in the stator can be increased. Therefore, a brushless AC servo motor with high magnetic flux density and high torque can be obtained.

In order to fully exploit the advantages of such a disc-shaped AC servo motor, it is necessary to maximize the space factor of the conductor within the disc-shaped stator. It is desirable to make the gap between the conductor lines as small as possible.

As methods for manufacturing spiral conductors, there are known methods such as punching a plate-shaped conductor and forming a winding pattern by etching. This is the easiest method.

However, when a spiral conductor is formed from a metal wire with a uniform cross section such as enameled wire, even if multiple spiral conductors are arranged densely in the circumferential direction within a plane, the center of the disk-shaped winding layer As the distance between the wires of the spiral conductor increases from the side toward the outer circumference, the space factor of the spiral conductor relative to the total area in the plane of the winding layer cannot be increased very much.

[Means for solving problems]

As a means for solving the above problems, the present invention includes a disc-shaped stator and a disc-shaped rotor coaxially and rotatably disposed with respect to the stator with a gap in the axial direction, the stator consists of a laminated structure of a plurality of disk-shaped winding layers each having a plurality of spiral conductors formed by spirally bending a metal wire, and the spiral conductors in each winding layer are connected to each other through gaps in the circumferential direction. In an AC servomotor comprising a plurality of permanent magnets arranged and sequentially connected, each rotor having a plurality of permanent magnets arranged at intervals in the circumferential direction, the spiral conductor in each disc-shaped winding layer is By gradually reducing the thickness from the center of the wire layer toward the outer periphery by pressing, the line width in the plane direction of the spiral conductor in each disc-shaped winding layer is reduced from the center of the wire layer to the outer periphery. To provide an AC servo motor characterized by being gradually widened toward the sides.

[Effect]

According to the above means, since the line width in the plane direction of the spiral conductor in each disc-shaped winding layer gradually increases from the center side to the outer circumference side of the winding layer, the outer circumference of the disc-shaped winding layer The inter-line gap of the spiral conductor on the side can be narrowed to approximately the same extent as the inter-line gap on the center side. Therefore, the space factor of the spiral conductor with respect to the total area in the plane of the @ line layer can be maximized.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 7 show one embodiment of the present invention. First, referring to FIGS. 1 and 2, the disk-type brushless AC servo motor includes a disk-shaped stator 11 and a disk rotatably disposed coaxially with the stator 11 with a gap in the axial direction. shaped rotor 1
2. Here, four stators 11 and 3
The rotors are arranged alternately in the axial direction. The stator 11 is held inside a stator housing 13, and the rotor 12 is held by a rotor shaft 14 that is rotatably supported with respect to the stator housing 13.

Each rotor 12 includes a base member 15 made of a non-magnetic material,
It consists of a plurality of permanent magnets 16 fixed to the base member 15 and extending through the base member 15 in the axial direction. The permanent magnets 16 are magnetized to have multiple poles and are arranged at equal intervals in the circumferential direction. That is, both ends of each permanent magnet 16 are magnetized to N and S poles, and the rotor 1
On both end faces of the permanent magnets 16, N poles and S poles are arranged alternately in the circumferential direction.

Each stator 11 has a laminated structure of a plurality of disk-shaped winding layers 17. Each winding layer 17 includes a plurality of spiral conductors 18 . The spiral conductor 18 is formed by bending a metal wire such as an enameled wire into a spiral shape.

The spiral conductors 18 in each winding layer 17 are arranged in the circumferential direction with gaps between them and are sequentially connected.

That is, the inner end of the spiral of each spiral conductor 18 is connected to the outer end of the spiral of another spiral conductor 18 adjacent to one side thereof. For the spiral conductor 18, a metal wire having a general round or rectangular cross section can be used.

The spiral conductors 18 in each disc-shaped winding layer F are press-molded in the axial direction while being arranged in the circumferential direction.

Referring to FIGS. 3 to 7, in this press forming, the spiral conductor 18 is formed so that its thickness gradually decreases from the center side to the outer circumferential side of the winding layer 17. The line width of the spiral conductor 18 in the disk-shaped winding layer 17 in the planar direction is gradually expanded from the center side of the winding layer 17 toward the outer circumferential side. As a result, the inter-line gaps in each spiral conductor 18 are formed substantially uniformly throughout. Further, the inter-line gaps between adjacent spiral conductors 18 are also formed to be approximately the same and uniform. The gap between the lines is the minimum dimension for insulation between the lines (approximately 0.5 to 0.1 mm)
It is preferable that

The plurality of press-molded winding layers 17 are individually fixed and molded into a disk shape using resin or the like, and then laminated and fixed to each other.

Since the thickness of each disc-shaped winding layer F gradually decreases from the center toward the outer circumference, the thickness of the disc-shaped stator 11 formed by stacking the winding layers 17 is smaller at the center. It gradually becomes thinner from the side toward the outer periphery. Therefore, in order to make the gap between the disc-shaped rotor 12 and the disc-shaped stator 11 uniform, the plate thickness of the disc-shaped rotor 12 is preferably gradually increased from the center to the outer circumference. .

In the AC servo motor having the above configuration, the line width in the planar direction of the spiral conductor 18 in each disk-shaped winding layer 17 gradually increases from the center side to the outer circumferential side of the winding layer. The gap between the wires of the spiral conductor on the outer circumferential side of the winding layer 17 can be narrowed to approximately the same extent as the gap between the spiral conductors on the center side. Therefore, the space factor of the spiral conductor 18 with respect to the total area in the plane of the winding layer 17 can be maximized. Therefore, the output torque can be increased without increasing the external size.

Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and various changes can be made to its constituent elements within the scope of the invention described in the claims. .

For example, the number of disc-shaped stators and disc-shaped rotors may be one each, or a plurality of discs other than three. Further, the structure for attaching the stator to the stator housing and the structure for attaching the rotor to the rotor shaft can be designed as appropriate.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the line width in the plane direction of the spiral conductor in each disc-shaped winding layer gradually increases from the center side to the outer circumferential side of the winding layer. Therefore, the gap between the lines of the spiral conductor on the outer circumferential side of the disk-shaped winding layer can be narrowed to almost the same level as the gap between the lines on the center side. Therefore, the space factor of the spiral conductor with respect to the total area in the plane of the winding layer can be maximized. Therefore, it is possible to provide an AC servo motor that can obtain a large output torque without increasing its external size.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an AC servo motor showing an embodiment of the present invention, Fig. 2 is a schematic end view of a disc-shaped stator used in the motor shown in Fig. 1, and Fig. 3 is the same as Fig. 1. 4 is an enlarged view of part A in FIG. 3, and FIG. 5 is a front view of the spiral conductor used in the disk-shaped stator of the motor shown in FIG.
An enlarged cross-sectional view, FIG. 6 is an enlarged view of part B in FIG. 3,
FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6. DESCRIPTION OF SYMBOLS 11... Disc-shaped stator, 12... Disc-shaped rotor, 13... Stator housing, 14... Rotor shaft, 15... Base member, 16... Permanent magnet, 17... Disc-shaped Winding layer, 18... spiral conductor.

Claims (1)

[Claims] 1. A disc-shaped stator, and a disc-shaped rotor coaxially and rotatably disposed with respect to the stator with a gap in the axial direction, and the stator is made of a metal wire spirally arranged. It has a laminated structure of a plurality of disk-shaped winding layers with a plurality of bent spiral conductors, and the spiral conductors in each winding layer are arranged with gaps in the circumferential direction and connected sequentially. In an AC servo motor in which each rotor is equipped with a plurality of permanent magnets arranged at intervals in the circumferential direction, the thickness of the spiral conductor in each disc-shaped winding layer is adjusted by pressing. By gradually thinning the layer from the center to the outer periphery, the line width in the plane direction of the spiral conductor in each disc-shaped winding layer is gradually increased from the center to the outer periphery of the winding layer. AC servo motor characterized by: 2. The thickness of the disc-shaped stator becomes thinner from the center toward the outer circumference, and the thickness of the disc rotor is such that a constant gap is formed between the rotor and the disc-shaped stator. The AC servo motor according to claim 1, wherein the AC servo motor becomes thicker from the center toward the outer circumference. 3. A plurality of the disc-shaped stators and a plurality of the disc rotors are arranged alternately in the axial direction, the disc-shaped stator is held inside the stator housing, and the disc-shaped rotor is The AC servo motor according to claim 1 or 2, wherein the AC servo motor is held by a rotor shaft rotatably supported by a stator housing.