JPS6066658A - Ac servo motor - Google Patents

Abstract

PURPOSE:To obtain large torque by alternately disposing a plurality of rotor discs and ring-shaped stator disc, thereby reducing an inertial moment. CONSTITUTION:An AC servo motor 10 has a stator housing 12, and rotatably supported at a rotor shaft 20 through bearings 22, 24 to the side housings 16, 18. A rotor disc 26 has a disc substrate, and flat platelike permanent magnets arranged radially in an equal angular interval to the substrate, and ring-shaped stator disc 34 is formed of a ring planar substrate and a winding, and which are mounted on a rotor shaft 20 and a center housing 14. The both discs 26, 34 are alternately disposed along the axial direction in such a manner that the permanent magnet surfaces and the winding are opposed. Thus, the disc 26 of large diameter can be used to increase the output torque.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an AC servo motor, and particularly to an AC servo motor that is effective when applied to a large torque AC servo motor.

Prior Art and Problems A conventional AC servo motor has a structure in which a substantially cylindrical rotor is rotatably provided within a stator housing, and a substantially cylindrical stator is arranged around the rotor. Generally, the output torque of such a motor is proportional to the total stator current, wire length, magnetic flux density, and rotor diameter, but in the case of such a conventional structure, in order to obtain large torque, the outer diameter of the rotor must be increased. It is also necessary to sip it long in the axial direction. As a result, the weight and moment of inertia of the rotor become very large. For this reason, practical problems arise when a conventional high-torque AC servo motor is used for a small driven body.

OBJECTS OF THE INVENTION In view of the problems of the prior art described above, an object of the present invention is to provide an AC turbo motor that can obtain large torque while keeping the total weight and moment of inertia of the rotor as small as possible.

According to the present invention, a plurality of rotor disks each having a plurality of flat plate-shaped permanent magnets arranged radially within a disk substrate, and a ring-shaped stator equipped with windings are provided. - The stator disks are arranged alternately in the axial direction facing each other, and the stator disks are fixed to the stator housing, and the rotor disks are fixed to a rotor shaft rotatably supported by the stake housing. Achieved by AC servo motor.

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

1 to 3 show one embodiment of the present invention. Referring to these figures, the AC servo motor IO is equipped with a stator housing 12, and the stator housing 12 is composed of a substantially cylindrical center housing 14 and side housings 16 and 18 fixed to both ends of the center housing 14. It has become. A rotor shaft 20 extending along the axial direction of the center housing 14 has a hair ring 22.
24 and rotatably supported on the side housing 16.18.

Reference numeral 26 indicates a rotor disk. The rotor disk 26 is connected to a disk substrate 28 as shown in FIG.
and a plurality of flat permanent magnets 30 arranged radially within the disk substrate 28 at equal angular intervals. The disk substrate 28 is made of plastic, aluminum, or the like.

Both end surfaces of the flat permanent magnet 30 are connected to the rotor disk 26.
It is exposed on both end faces and constitutes both poles. The disk substrate 2 has a center hole 32 in the center into which the rotor shaft 20 fits, and the thickness of the periphery of the center hole 32 is larger than the thickness of its outer periphery and the thickness of the permanent magnet 30. .

Reference numeral 34 indicates a ring-shaped stator disk. As shown in FIG. 3, the stator disk 34 consists of a ring plate substrate 36 and a winding 38 wound around the inner and outer diameters of the ring plate substrate 36. The ring plate substrate 36 is made of magnetic material.

Although the number of rotor disks 26 is not particularly limited, here, ten rotor disks 26 and nine stator disks 34 are arranged alternately along the axial direction, and the permanent magnet surface of the rotor disk 26 is the same as the stator disk. Winding 3 of disk 34
Facing 8.

Stator disk 34 is fixed to center housing 14, and rotor disk 26 is non-rotatably attached to rotor shaft 20.

Here, keys 840.42 are formed on the rotor disk 26 and the rotor shaft 20, respectively, and both key grooves 4
A key (not shown) that engages the rotor
Although the disk 26 is not rotatable with respect to the rotor shaft 20, the key m of the rotor shaft 20 is attached to the rotor disk 26.
42 may be formed to restrict rotation, or any other fixing means may be used.

Here, the rotor disk 26 is axially fixed by two rings 44, 46 press-fitted into the rotor shaft 20, but the axial fixing means of the rotor disk 26 cannot be of any other type. Good too.

Generally, the output torque of an AC servo motor is proportional to the total stator current, wire length, magnetic flux density, and rotor diameter. However, in the AC servo motor with the above configuration, it is necessary to arrange the stator around the rotor disk 26. Since there is no rotor disk, a large diameter rotor disk can be used. Therefore, output torque can be increased. Furthermore, since the rotor disks 26 and stator disks 34 are arranged alternately in the axial direction, the opposing surface area of the rotor disks 26 and stator disks 34 is reduced compared to a conventional rotor of the same length. can be increased. Therefore, the total current and wire length of the stator can be increased, and the output torque can be increased. on the other hand,
Since the total weight of the rotor disk 26 can be reduced compared to rotors of the same length, the moment of inertia of the rotor can be reduced. Therefore, it can be used for small-sized driven objects without any practical problems.

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

Effects of the Invention As is clear from the above description, the present invention comprises a plurality of rotor disks each having a plurality of flat permanent magnets arranged radially within a disk substrate, and a winding. Ring-shaped stator disks are arranged alternately in the axial direction facing each other, and the stator disks are fixed to the stator housing, and the rotor disks are fixed to the stator housing.
Since the disk is fixed to the rotor shaft rotatably supported by the stake housing, the AC servo motor is capable of obtaining large torque while keeping the total weight and moment of inertia of the rotor as small as possible. We will be able to provide this.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of an AC servomorph showing an embodiment of the present invention, FIG. 2 is a schematic front view of the rotor disk of the motor (not shown in FIG. 1), and FIG. 3 is a schematic front view of the motor (not shown in FIG. 1). FIG. 3 is a schematic partial front view of the stator disk of FIG. 10-AC servomorph, 12-stator housing, 20-rotor shaft, 26-rotor disk, 28-disk substrate, 30-permanent magnet, 34-stator disk, 3 rolling plate substrate, 38-winding, patent Applicant Fanasoku Co., Ltd.'jfJ1 Figure 2 Figure 38 'Φ

Claims (1)

[Claims] 1. A plurality of rotor disks each having a plurality of flat permanent magnets arranged radially within a disk substrate, and a ring-shaped stator disk equipped with windings are mutually connected to each other. An AC servomotor comprising: facing each other and alternately arranged in the axial direction, the stakes and disks being fixed to a stator housing, and the rotor disk being fixed to a rotor shaft rotatably supported by the stator housing. 2. The AC servo motor according to claim 1, wherein the disk substrate of the rotor disk is made of either plastic or aluminum.