JPH08126277A - Flat rotating machine - Google Patents

Abstract

PURPOSE: To improve the efficiency of a core-less flat rotating machine while reducing the generation of its eddy current, by so configuring its disk-form stator coil that a plurality of coils formed out of a Ritz wire each of which is wound in the form of a nearly triangular one are provided in the form of a circle. CONSTITUTION: In each air-gap formed out of two flat type rotors of a flat rotating machine, a disk-form stator coil 10 shaped in the form of a flat type is provided. In the stator coil 10, coils 11 of respective phases U, V, W each of which is wound in the form of a nearly triangular one with a Ritz wire of an insulating wire stranded out of tens to several tens of fine enamel wires, etc., are provided in the form of a circle. Therefore, the area of the conductor of the coil 11 which is projected on a plane in the direction of the magnetic flux of the flat rotating machine is made small. Also, since the stator coil 10 is a core-less one, the iron loss comprising a hysteresis loss caused by the fact that the magnetic flux is changed with time in a magnetic circuit and an eddy current loss is eliminated, and as a result, the heat generation quantity of the stator coil 10 is reduced. Thereby, the generation of the eddy current loss of the core-less flat rotating machine can be reduced, and its efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat rotating machine, and more particularly to a permanent magnet type flat rotating machine, in which a litz wire is used for a stator coil (armature winding) and a coreless structure is used so that the magnetic flux in the magnetic circuit is temporal The present invention relates to a flat rotating machine that reduces eddy current loss caused by changes and improves efficiency.

[0002]

2. Description of the Related Art In a rotating electric machine such as a motor or a generator, such as a DC machine or a synchronous machine, a system in which a current is passed through a field coil to generate a magnetic field, the efficiency decreases when the field current is increased. Therefore, in the method of generating a magnetic field with a permanent magnet, there has been no magnet with a large energy density so far, so a magnetic circuit is constructed using a material with a low magnetic resistance such as iron. Iron loss occurs in the area of, and the efficiency decreases.

In order to prevent this, thin iron plates insulated from each other are used in layers where magnetic fields alternate, and a material having a small iron loss such as a silicon steel plate is used. In recent years, magnets with a particularly high energy density have been developed,
Even a rotating machine with a large air gap can generate a large magnetic field, and it is rather advantageous to have no iron core.

Therefore, in a flat rotating machine of a large capacity device, the stator coil is formed of a rectangular copper wire in order to increase the current capacity.

[0005]

However, in the conventional flat rotating machine, since the magnetic flux evenly passes through the conductor of the armature winding, an eddy current is generated in the conductor, which deteriorates the efficiency.

The present invention has been made in view of the above points, and uses a litz wire, which has a small projected area in the direction of the magnetic flux, as a stator coil, that is, an armature winding and is coreless, so that eddy current loss occurs. The purpose of the present invention is to provide a coreless flat rotating machine in which the efficiency is improved by reducing

[0007]

In order to solve the above-mentioned problems, the flat rotating machine of the present invention is a disk-shaped flat rotor having a plurality of permanent magnets fixed in order with different polarities. Two permanent magnets of the two flat type rotors, which are arranged apart from each other and are spaced apart from each other, are opposed to each other with different polarities, and a shaft rotatably supported by brackets at both ends is provided. A fixed rotor, a plurality of Litz wire coils wound in a substantially triangular shape arranged in a circle, and a disk-shaped stator coil molded in a flat shape with a synthetic resin material, and the above two flats. Place the coil portion of the stator coil in the gap position formed by the mold rotor,
It is characterized in that it is provided with a spacer for fixing the outer peripheral portion of the stator coil and a cylindrical case for accommodating the spacer, the stator coil and the rotor.

As the permanent magnet, a magnet having a large energy density is used which is made of an alloy magnetic material containing neodymium Nd, iron Fe and boron B. Ventilation duct holes are formed in the rotor, the spacer, and the cylindrical case, respectively, so that cooling air can flow therethrough.

A plurality of flat rotors, stator coils and spacers may be provided to form a multistage flat rotating machine.

[0010]

[Function] Since the litz wire is used for the stator coil,
The projected area of the armature winding conductor in the direction of the magnetic flux is reduced, and the eddy current loss in the armature winding conductor is reduced, and since the stator coil is coreless, iron loss is eliminated and the efficiency of the flat rotating machine is reduced. Is improved.

[0011]

1 is a partial sectional view of an embodiment of a flat rotating machine according to the present invention, and FIG. 2 is a sectional view taken along the line A--A of FIG.

The flat rotary machine of FIG. 1 is shown to have a three-stage structure, and can be a single-stage flat rotary machine as will be described later. 1 and 2, brackets 2 are fixed to both ends of a cylindrical case 1 with screws 3. A bearing 4 is fitted in each bracket 2, and a shaft 5 is rotatably supported by the brackets 2 on both sides. Four flat disk-shaped flat rotors 8 are arranged and fixed to the shaft 5 with a gap 9 therebetween. A plurality of permanent magnets 6 having different polarities are sequentially fixed to the disc-shaped flat rotor 8. The permanent magnets 6 of the two flat rotors 8 arranged with the gap 9 therebetween are opposite in polarity. These permanent magnets 6 are fixed by a magnet holder 19, a nonmagnetic ring 20, and the like.

Reference numeral 7 is a yoke, and rotor 15 is 4
It is composed of one flat type rotor 8. For these permanent magnets 6, a magnet having a high energy density, for example, a magnetic material of an alloy containing neodymium Nd, iron Fe, and boron B is used.

A disk-shaped stator coil 10 having a flat shape and shown in FIG. 5, that is, an armature winding, is provided in each space 9 formed by the two flat rotors 8. Has been done. The stator coil 10 is
As shown in FIG. 4, U-, V-, and L-shaped litz wires of an insulated electric wire in which thin enameled wires having a diameter of about 0.1 mm are combined from 10 to several tens of wires, as shown in FIG. As shown in FIG. 2, the coils 11 of each phase W are arranged in a circle, and
It has a layered structure and is solidified by molding with an insulating varnish or a synthetic resin material.

FIG. 3 shows a partial sectional view of an embodiment of the stator coil. Insulating paper 12 is sandwiched between the layers of each coil 11, and the insulating paper 12 is also molded on the surface. A fixing hole 13 is formed on the outer peripheral portion of the stator coil 10.

The stator coil 10 is sandwiched between the circular spacers 16 shown in FIG. 6 in a side-itch shape, and fixing holes 17 are formed in the spacer 16 and fixing holes formed in the stator coil 10. It is fixed to one side of the bracket 2 with the bolt 18 using the hole 13 of the. At this time, the portion of the coil 11 of the stator coil 10 is the permanent magnet 6
Needless to say, it is arranged at the position of.

A ventilation duct hole 5-1 is formed in the central axis of the shaft 5, and a radial ventilation duct hole 5-2 is formed in communication with the ventilation duct hole 5-1. Further, the magnet holder 19 fixed to the shaft 5 is provided with a ventilation duct hole 19-1 communicating with the radial ventilation duct hole 5-2, and further the spacer 16 is provided with a ventilation duct hole 16-1. At the same time, a plurality of ventilation duct grooves 1-1 that communicate with the ventilation duct holes 16-1 of the spacer 16 and form ventilation duct holes in the axial direction of the cylindrical case 1 are formed.

These shaft 5 and magnet holder 1
9, ventilation duct holes 5 provided in the spacer 16 respectively
-1, 5-2, 19-1, 16-1 and the ventilation duct groove 1-1 which forms the ventilation duct hole provided in the cylindrical case 1 allows the cooling air to pass therethrough and dissipates the heat generated in the stator coil 10. To be done.

Since the stator coil 10 is formed by using the litz wire in the flat rotating machine of the present invention thus constructed, the projected area of the conductor in the direction of the magnetic flux becomes small and the eddy current loss decreases. . Further, since the stator coil 10 does not have a core, iron loss such as hysteresis loss and eddy current loss caused by temporal change of magnetic flux in the magnetic circuit is eliminated.

Therefore, the amount of heat generated by iron loss is reduced and an efficient motor or generator can be manufactured. In the above description, the flat rotary machine has been described as having a three-stage structure, but the one-stage structure has a structure in which the two sets of the stator coil 10 and the flat rotor 8 are not removed in FIG. is there.

[0021]

As described above, according to the present invention, since the litz wire is used for the stator coil, the projected area in the direction of the magnetic flux of the conductor of the armature winding is reduced, and Eddy current loss is reduced and heat generation is suppressed.

Since the stator coil is coreless, iron loss is eliminated and the efficiency of the flat rotating machine is improved.
Therefore, it is possible to reduce the size and weight of the flat rotating machine.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of a flat rotating machine according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial cross-sectional view of an embodiment of a stator coil.

FIG. 4 is an explanatory view of winding of a coil.

FIG. 5 is a perspective view of an embodiment of a stator coil.

FIG. 6 is a perspective view of an example of a spacer.

[Explanation of symbols]

 1 Cylindrical case 2 Bracket 5 Shaft 6 Permanent magnet 7 Yoke 8 Flat type rotor 9 Air gap 10 Stator coil 11 Coil 15 Rotor 16 Spacer

Claims (4)

[Claims] 1. A disk-shaped flat type rotor having a plurality of permanent magnets fixed in order with different polarities, with a space between them.
The permanent magnets of the two flat type rotors arranged with a gap therebetween are opposed to each other with different polarities, and are fixed to a shaft rotatably supported by brackets at both ends. And a disk-shaped stator coil in which a plurality of Litz wire coils wound in a substantially triangular shape are arranged in a circular shape and molded in a flat shape with a synthetic resin material, and the above two flat-type rotors. A flat rotating machine comprising a spacer for arranging a coil portion of a stator coil in a void position to be formed and fixing an outer peripheral portion of the stator coil, and a cylindrical case for accommodating the spacer, the stator coil and a rotor. . 2. The permanent magnet is neodymium Nd, iron F
The flat rotating machine according to claim 1, wherein the flat rotating machine is made of an alloy magnetic material containing e and boron B. 3. The flat type rotor, the stator coil and the spacer are respectively provided in plurality to form a plurality of flat rotating machines.
Flat rotating machine described. 4. The flat rotating machine according to claim 1, wherein ventilation duct holes are formed in the rotor, the spacer and the cylindrical case, respectively, to allow cooling air to flow therethrough.