JPH07203644A - Rotary device - Google Patents

Abstract

PURPOSE:To increase the surface flux density of magnetic poles for the enhancement of torque and the reduction of manufacturing cost, by forming a rotary device using a stator having a plurality of electromagnets secured in a housing, and a rotor composed of permanent magnets embedded in a disk-like support between a plurality of magnetic pole pieces of high-permeability material embedded in the support. CONSTITUTION:A stator 12 is installed in a housing. Iron cores 12b of a rectangular parallelepiped are installed on the inside surface of its cylindrical iron core 12a at a constant interval. Wires 12c are wound around the iron cores 12b to form electromagnets, and the phases U, V and W are connected to a power supply. A rotor 13 is obtained by embedding a plurality of magnetic pole pieces in a polygonal support placed in the center of the housing. Each of the magnetic pole pieces is made of high-permeability soft magnetic iron and almost of a rectangular parallelepiped. It has a brim on the outside circumference and a fitting section on the inside circumference. A rod-shaped permanent magnet is fitted in each of the spaces between the support and the magnetic pole pieces. This makes it possible to effectively collect the lines of magnetic force from the permanent magnets, and to reduce the man-hours in the assembly of the rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning device, and more particularly to a turning device capable of turning a plate member having a high torque and carrying a heavy object at a low speed.

[0002]

2. Description of the Related Art In this type of rotating device, the easiest and most effective way to increase the rotating torque is to increase the magnetic force of a permanent magnet when the stator coil conditions are constant. As the high magnetic force material, a material containing a rare earth element such as a samarium-cobalt-based material or a neodymium-iron-boron-based material is commercially available. However, since all of them are expensive, an inexpensive ferrite-based material is used. As a conventional rotor, as shown in FIG. 4 (a), there is a rotor in which a radially oriented C-type ferrite sintered magnet is laminated around a disk-shaped support portion with alternating polarities. Further, as shown in FIG. 4 (b), there is one in which a polar anisotropically oriented ferrite bonded magnet is provided around a disk-shaped support portion.

[0003]

However, each of the above rotors has a problem that the surface magnetic flux density is as low as about 1500 to 1800 Gauss, so that the rotating torque of the rotating device cannot be increased. Further, in the case of the radial-oriented C-type ferrite sintered magnet, there is a problem that a dedicated die is required and the manufacturing cost becomes high. The present invention is intended to solve the above problems, and an object of the present invention is to provide a rotating device having a rotor whose surface magnetic flux density of magnetic poles is increased to obtain high magnetic force and manufacturing cost is low.

[0004]

In order to achieve the above-mentioned object, the structural feature of the invention according to claim 1 is that a rotary shaft rotatably supported by a housing and an axial direction of the rotary shaft. A non-magnetic disc-shaped support portion fixed vertically, a plurality of magnetic pole pieces of a high magnetic permeability material attached to the outer peripheral surface of the disc-shaped support portion at equal intervals in the radial direction, and both pole pieces A rotor composed of a plurality of magnets that are inserted so that the magnetic poles face each other and that are arranged so that the magnetic poles sandwiching each magnetic pole piece have the same polarity, and the rotor around or around the rotor in a vertical position. A stator having a plurality of electromagnets fixed to the housing at equal intervals is provided so as to face each other. The non-magnetic material is aluminum, beryllium copper, brass or the like, and a titanium alloy is most preferable as a lightweight and high-strength material. As the high magnetic permeability material, low carbon iron such as electromagnetic soft iron and permalloy, and a silicon steel plate are used. The magnet may be a magnet in which anisotropic ferrite is axially oriented or a bonded magnet, but a sintered magnet is most preferable.

Further, the structural feature of the invention according to claim 2 is that, in the rotating device according to claim 1, the magnetic pole pieces are fitted and fixed to the disk-shaped supporting portion, and the magnet is provided between the magnetic pole pieces. It is to be fitted and fixed.

[0006]

In the invention according to claim 1 configured as described above, since the magnetic pole pieces are made of a material having a high magnetic permeability, magnetic force lines from magnets facing each other with the same polarity sandwiching the magnetic pole pieces are provided. Since it can be effectively collected without leaking, a high magnetic force can be generated at the tip of the magnetic pole piece. As a result, this rotating device can obtain high torque.

Further, in the invention according to claim 2 configured as described above, the magnetic pole piece and the disk-shaped supporting portion are made to have a fitting structure such as a key groove structure, and are easily assembled by fitting them together. You can Further, the magnet can be easily assembled to the assembled product of the magnetic pole piece and the disk-shaped support portion. As a result, an adhesive is not required for assembling the rotor, the number of assembling steps can be reduced, and the cost of the rotating device can be reduced. Further, since the rotor can be easily disassembled into each component, usable components can be reused and a recycling effect can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are a plan view and a partially broken sectional view of a rotating device 10 for rotating a heavy object of about 5 kg to 100 kg according to an embodiment at a low speed. Rotating device 10
Is provided with a housing 11 made of steel and having a cylindrical shape, the upper and lower surfaces of which are sealed, and a stator 12 is fixed to the peripheral wall of the housing 11 with screws. The stator 12 is formed of a magnetic material, and is provided with a cylindrical iron core 12a having an outer diameter of 220 mmφ, and an iron core 12b having a rectangular parallelepiped shape with a wide inner end toward the center is provided on the inner side surface of the iron core 12a. Twelve pieces are attached at regular intervals. Iron core 12a, iron core 12b
It is desirable that the material of (1) has a high magnetic permeability and a high saturation magnetic flux density. Specifically, in addition to iron, electromagnetic soft iron (SUY) or permalloy having a low carbon content can be used.
A copper winding 12c is wound around the iron core 12b 220 times in a certain direction to form an electromagnet M. As shown schematically in FIG. 1, four electromagnets M are provided in the order of U, V, and W phases. A necessary insulation treatment is applied between the iron core 12b and the winding wire 12c of each phase such as UVW. And
Each U, V, W phase is connected to a power supply control device (not shown).

Inside the iron core 12b, a donut plate-shaped rotor 13 having an outer diameter of 130 mmφ is provided with a gap of 0.5 mm. As shown schematically in FIG. 3, the rotor 13 is provided with a substantially octagonal aluminum support portion 13a at the center, and a mounting hole 13a1 for attaching a fixing plate 16 described later to the center portion of the support portion 13a. Is provided. The mounting hole 13a1 is provided with a pair of grooves 13a3. A key groove 13a2 for fitting a magnetic pole piece is provided at the apex of the octagon of the support portion 13a. The magnetic pole piece 13b is made of electromagnetic soft iron, which is a high magnetic permeability material, has a substantially rectangular parallelepiped shape, and is provided with a collar-shaped portion 13b1 on the outer peripheral portion.
A fitting portion 13b2 that fits into the key groove 13a2 of the support portion 13a is provided on the inner peripheral portion. Pole piece 13b
Fits the fitting portion 13b2 to the key groove 13a2 of the support portion 13a.
It can be easily assembled to the support portion 13a by fitting it to.

Eight rod-shaped permanent magnets 13c are closely fitted to the space between the support portion 13a and the pole piece 13b. The permanent magnets 13c are fitted so that both magnetic poles face the side surfaces of the magnetic pole pieces, and the permanent magnets 13c are arranged so as to have the same polarity with the magnetic pole pieces 13b interposed therebetween. On the upper and lower surfaces of the rotor 13, the fitted support portion 13a, the magnetic pole pieces 13b, and the permanent magnet 1 are attached.
A support plate 14 for integrally supporting 3c is provided. The support plate 14 has a rotary shaft 15 integrally provided on the outer side surface thereof, and a fixed plate 16 for fixing the rotary shaft 15 to the center of the rotor 13 on the inner side surface thereof. Fixed plate 1
6 is a groove 13a of the supporting portion 13a due to its convex portion 16a.
3 is fitted and fixed. The rotating shaft 15 is rotatably supported by bearings 15 a on the upper and lower surfaces of the housing 11.

In the rotor 13 configured as described above, since the magnetic pole pieces are made of a high magnetic permeability material, the magnetic pole lines are effectively collected without leaking from the magnets facing each other with the same polarity. Therefore, it is possible to generate a magnetic force of about 3000 gauss at the tip of the magnetic pole piece, which is 60% or more higher than that of the conventional magnetic pole piece. Therefore, a very high torque can be obtained by the attraction and repulsion action of the high magnetic force at the tip of the pole piece and the magnetic force of the electromagnet of the stator.

Further, in the rotor 13, a key groove structure is provided between the magnetic pole piece and the supporting portion, so that they can be easily assembled by fitting them together. Further, the magnet can be easily assembled between the pole piece and the supporting portion. Therefore, the number of steps for assembling the rotor can be reduced, and an adhesive is not required for assembling the rotor, so that the manufacturing cost of the rotor can be reduced. Further, since the rotor can be easily disassembled into each component, usable components can be reused and a recycling effect can be obtained.

The shapes of the stator and the rotor of the rotating device can be appropriately changed according to the application.

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of a rotating device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the rotating device.

FIG. 3 is a plan view showing the rotor in detail.

FIG. 4 is a schematic plan view of a rotor according to a conventional example.

[Explanation of symbols]

10; Rotating device, 11; Housing, 12; Stator, 1
2a, 12b; iron core, 12c; winding, 13; rotor,
13a; support part, 13a1; mounting hole, 13a2; key groove, 13b; magnetic pole piece, 13b1; collar part, 13b2; fitting part, 14; support plate, 15; rotating shaft, 16; fixed plate.

Claims (2)

[Claims] 1. A rotary shaft rotatably supported by a housing, a non-magnetic disc-shaped support portion fixed perpendicularly to the axial direction of the rotary shaft, and an outer peripheral surface of the disc-shaped support portion. A plurality of magnetic pole pieces made of a high-permeability material attached in the radial direction at intervals, so that both magnetic poles are inserted between the magnetic pole pieces so that the magnetic poles sandwiching each magnetic pole piece have the same polarity. A rotor composed of a plurality of magnets arranged, and a stator having a plurality of electromagnets fixed to the housing at equal intervals so as to face the rotor around or above and below the rotor. A rotating device provided. 2. The rotating device according to claim 1, wherein the magnetic pole piece is fitted and fixed to the disc-shaped support portion,
A rotating device in which the magnet is fitted and fixed between the magnetic pole pieces.