JPH08242564A - Binder structure of rotary electric machine - Google Patents

Abstract

PURPOSE: To strengthen the centrifugal force resisting strength of a rotor by winding a binder of high-strength fibrous members having a small specific gravity around the outer peripheral surface of the rotor. CONSTITUTION: A binder 10 of a fibrous members having a low specific gravity and high tensile strength is wound around a yoke 5. Fibers, such as carbon fibers, glass fibers, aramid fibers, etc., having small specific gravities and high strengths are used for the fibrous members of the binder 10 and, at the time of winding the binder 10 around the yoke 5, the fibrous members are impregnated with a synthetic resin after the fibrous members are wound around the yoke 5 and the resin is cured. Since the light binder 10 in which no strong stress is generated by its own centrifugal force is wound around the yoke 5, the binder 10 can resist to the centrifugal force of the yoke 5 provided with permanent magnets 6 and strengthens the centrifugal force resisting strength of a rotor. In other words, a rotary electric machine can be operated at a higher rotating speed because of the high tensile strength of the binder 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding structure for a rotating electric machine, particularly when a rotor equipped with a permanent magnet rotates at high speed.
The present invention relates to a binding structure for a rotating electric machine, which is configured to prevent the shape deformation of a rotor due to the centrifugal force with a simple structure.

[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,
A rotating machine having a large air gap can generate a large magnetic field, and a so-called coreless rotating machine having no iron core tends to attract attention.

In a conventional coreless rotating machine, for example, a flat motor, a non-magnetic stainless steel ring is often used as a means for increasing the centrifugal resistance strength of a rotor provided with a permanent magnet.

However, the conventional coreless rotating machine is
Since it has a small capacity and is not used at a high speed, the strength of the rotor against the centrifugal force has not been a particular problem.

[0006]

However, as the capacity and size of the coreless rotating machine increase, it is required to reduce the size and weight of the coreless rotating machine while maintaining its large capacity. In order to achieve high output and high density of the coreless rotating machine, it is necessary to use the peripheral speed of the rotor within a range close to the sonic speed, that is, high speed rotation of the coreless rotating machine is required, and the strength of the rotor against centrifugal force is high. Will need to be reinforced.

Since a conventional metal ring made of stainless steel or the like has a large specific gravity, when the rotor rotates at a high speed, the centrifugal force due to its own weight becomes large, and the ratio of the centrifugal force to the permanent magnet is reduced. Therefore, even if the thickness of the metal ring is increased, its weight does not increase and its strength does not increase.

The present invention has been made in view of the above points, and uses a high-strength fiber member, which has a low specific gravity, a small stress due to its own centrifugal force, and can withstand higher speed rotation, instead of a metal ring. An object of the present invention is to provide a binding structure for a rotating electric machine that can reinforce the centrifugal strength of the rotor.

[0009]

In order to solve the above-mentioned object, the binding structure for a rotating electric machine according to the present invention separates a gap,
A plurality of permanent magnets of opposite polarities are arranged,
In a binding structure of a rotating electric machine including a rotor rotatably supported in a cylindrical case and a stator coil arranged in a gap of the rotor, an outer peripheral surface of the rotor is made of a high-strength fiber member having a small specific gravity. It is characterized by being bound and bound.

The rotor includes a shaft and a cylindrical yoke fixed to the shaft and having a cylindrical space formed therein, and a plurality of rotors having different polarities and facing each other. Of the structure wherein the permanent magnets are provided on both inner circumferential surfaces of the cylindrical space of the yoke, or a circle in which a plurality of permanent magnets having different polarities are sequentially fixed to the shaft. A plate-shaped flat type rotor, and the disc-shaped flat type rotor is disposed on the shaft with two gaps, and the two flat type rotors are disposed with a gap. A permanent magnet is used in which the permanent magnets of the rotor are oppositely fixed to each other with different polarities.

[0011]

Since the specific gravity of the bind is small, the stress caused by its own centrifugal force is small even at high speed rotation, and it is possible to endure higher speed rotation and reinforce the centrifugal resistance strength of the rotor.

[0012]

1 is a sectional view of an embodiment of a coreless rotating machine according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In FIGS. 1 and 2, a bearing 2 is fitted in each bracket 1, and a shaft 3 is rotatably supported by the brackets 1 on both sides. A cylindrical yoke 5 having a cylindrical space 4 formed therein is fixed to the shaft 3 to form a rotor, and the cylindrical yoke 5 rotates integrally with the rotation of the shaft 3. There is.

A plurality of permanent magnets 6 and 7 are provided on the inner peripheral surfaces 4-1 and 4-2 of the cylindrical space 4 of the yoke 5 so as to face each other in different polarities. There is. As the permanent magnets 6 and 7, magnets having a high energy density, for example, made of a magnetic material of an alloy containing neodymium Nd, iron Fe, and boron B are used.

In the cylindrical gap formed by the plurality of permanent magnets 6 and 7 provided facing each other, a cylindrical stator coil 8 shown in FIG. Is provided. The end coil on one side of the stator coil 8 is fixed to the bracket 1, and the entire stator coil 8 is fixed to the bracket 1. In addition, 9 is a cylindrical case.

The stator coil 8 has a diameter of 0.1 m.
A plurality of coils for insulated U-, V-, and W-phase coils formed by winding a litz wire, which is an insulated electric wire consisting of 10 to several tens of thin enameled wires of about m in length, and formed into a tortoise shell shape shown in FIG. 1
Is formed into a cylindrical shape, and is solidified by molding with an insulating varnish or a synthetic resin material.

On the outer peripheral surface of the yoke 5, a bind 10 made of a fiber member having a low specific gravity and a high tensile strength is wound. As the fiber member of the bind 10, for example, carbon fiber, glass fiber, aramid fiber, or the like having a small specific gravity and high strength is used. For winding the fiber member, the fiber member is wound around the outer peripheral surface of the yoke 5. , Impregnated with synthetic resin material,
Curing process is performed.

By winding the bind 10 thus treated on the outer peripheral surface of the yoke 5, the bind 10 is
Since its own weight is small and the stress caused by its own centrifugal force is small, it is possible to withstand the centrifugal force of the yoke 5 provided with the permanent magnets 6 and reinforce the centrifugal resistance strength of the rotor. That is, since the bind 10 has high tensile strength, it can endure higher speed rotation.

A non-magnetic magnet cover 11 is wound around the surfaces of a plurality of permanent magnets 7 provided on the inner circumferential surface 4-2 of the inner wall of the cylindrical space 4 of the yoke 5. As the member of the magnet cover 11, the same member as that of the bind 10 is adopted.

When the rotating equipment has a large capacity,
As shown by the dotted line in FIG. 1, the yoke 5 is partially shaved to reduce its weight. Figure 5
FIG. 6 is a partial sectional view of an embodiment of a rotor of a flat rotating machine according to the present invention, and FIG. 6 is a sectional view taken along line BB of FIG.

In FIGS. 5 and 6, brackets 52 are fixed to both ends of a cylindrical case 51 drawn by imaginary lines, and the shaft 25 constituting the rotor 20 is rotatably supported by the brackets 52 on both sides. There is. Two flat disk-shaped flat rotors 28 are arranged and fixed to the shaft 25 with a gap 29 therebetween. A plurality of permanent magnets 26 are sequentially fixed to the disc-shaped flat rotor 28 with different polarities. The permanent magnets 26 of the two flat type rotors 28, which are arranged with a gap 29 in between, face each other with different polarities. These permanent magnets 26 are embedded in the back yoke 27 and separated by the non-magnetic separator 23, and the outer peripheral surface of the flat rotor 28 is wound by the bind 21.

The bind 21 is made of the member described with reference to FIG. That is, a low specific gravity and high tensile strength fiber member, for example, carbon fiber, glass fiber, aramid fiber or the like having a small specific gravity and high strength is used for this fiber member. A fibrous member is wound around the outer peripheral surface of the flat rotor 28, impregnated with a synthetic resin material, and a curing process is performed.

The permanent magnets 26 have a high energy density, such as neodymium Nd, iron Fe, and boron B.
A magnet made of an alloy magnetic material containing is used. In the space 29 formed by the two flat rotors 28, a flat disk-shaped stator coil 50, that is, an armature winding is arranged. The stator coil 50 is a litz wire of an insulated electric wire in which ten to several tens of thin enameled wires having a diameter of about 0.1 mm are combined, and each of the U, V, and W phases wound in a substantially triangular shape. Six coils are arranged in a circular shape so as to face the permanent magnets 26 in FIG. 6, and the coils are solidified by molding with an insulating varnish or a synthetic resin material in a three-layer structure, for example.

As shown in FIG. 5, the stator coil 50 is sandwiched between circular spacers 56 in a side-itch shape and fixed to the cylindrical case 51. At this time, it goes without saying that the coil portion of the stator coil 50 is arranged at the position of the permanent magnet 26.

[0025]

As described above, according to the present invention, the outer peripheral surface of the rotor is wound with the binding of the high-strength fiber member having a small specific gravity, so that the stress due to the centrifugal force of the rotor is small and the speed is higher. It can withstand rotation and can reinforce the centrifugal strength of the rotor.

Therefore, the coreless rotating machine can rotate at a high speed, and it is possible to reduce its weight and size while maintaining a large capacity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a coreless rotating machine according to the present invention.

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

FIG. 3 is a perspective view of an embodiment of a stator coil used in the present invention.

FIG. 4 is a perspective view of an embodiment of a coil forming a stator coil.

FIG. 5 is a partial sectional view of an embodiment of the rotor of the flat rotating machine according to the present invention.

6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Bracket 3 Shaft 4 Cylindrical Space 4-1 and 4-2 Inner Wall Circumferential Surface 5 Yoke 6,7 Permanent Magnet 8 Stator Coil 9 Case 10 Bind 11 Magnet Cover 20 Rotor 21 Bind 26 Permanent Magnet 27 Back Yoke 28 Flat Type Rotor

Claims (3)

[Claims] 1. A rotor in which a plurality of permanent magnets facing each other with different polarities are arranged with a gap therebetween, and the rotor is rotatably supported in a cylindrical case, and a stator arranged in the gap of the rotor. A binding structure for a rotary electric machine comprising: a coil; and a binding structure for a rotary electric machine, wherein an outer peripheral surface of the rotor is wound with a bind of a high-strength fiber member having a small specific gravity. 2. The rotor comprises a shaft and a cylindrical yoke fixed to the shaft and having a cylindrical space formed therein, and the rotors are provided to face each other with different polarities. The binding structure for a rotary electric machine according to claim 1, wherein a plurality of permanent magnets are provided on both inner wall circumferential surfaces of the cylindrical space of the yoke. 3. The rotor comprises a shaft and a disk-shaped flat rotor having a plurality of permanent magnets fixed in order with different polarities, and the shaft has the disk-shaped flat rotor. And two permanent magnets of the two flat type rotors, which are arranged with a gap, are fixed to face each other with different polarities. Item 1. A binding structure for a rotating electric machine according to item 1.