JPH07255137A - Core for rotating machine, and disk type rotating machine using the core - Google Patents

Abstract

PURPOSE:To manufacture a small-sized high-power motor, by making the direction of the winding axis of a core for rotating machines which is configured through the winding of a unidirectional or bidirectional soft magnetic material coincide with the direction of the axis of easy magnetization of the soft magnetic material, and by improving the permeabilities of the teeth and back core of the core for rotating machines. CONSTITUTION:A winding core 1 for motors is so configured that bidirectional flat rolled magnetic steel sheets and strip are wound in the direction shown by an arrow 2. The direction of the winding axis of the core 1 is shown by an arrow 3. The orientations of the axes of easy magnetization of the bidirectional flat rolled magnetic steel sheets and strip arr indicated by arrows 4, 5. The winding direction 2 of the core 1 is made to coincide with the direction 4 of the axis of easy magnetization, and further, the direction 3 of the winding axis of the core 1 is made to coincide with the direction 5 of the axis of easy magnetization. By the use of this core 1, for example, a motor comprising a stator 7, a rotor 8, a permanent magnet 6 for its magnetic field system and a rotating shaft 9 is mounted on a supporting member 10, and a disk type brushless motor is formed. Thereby, a small-sized high-power motor is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core for a rotating machine such as an electric motor or a generator and a disk type rotating machine using this core.

[0002]

Motors are used in a wide range of industrial fields,
Various types of motors are used in an optimal control method according to the application. As a technological trend of motors, high performance is one of the important issues. For higher performance, higher performance and optimal magnetization of field permanent magnets, increased winding space factor, optimized core shape, improved power factor through optimal control, smaller size and weight due to casingless, cooling Many things have been done such as Noh improvement.

As a recent trend, disk type motors which face each other in the direction of the rotation axis are being studied because of effective use of magnetic flux and easy holding of the rotor magnet. In particular, this type of motor can be multistage,
It is easy to cope with higher output, and if a SUS cover is used to prevent the magnets from scattering like the conventional radial surface compatible motor, the loss in the SUS cover will be extremely large, but it will face the rotation axis in the opposite direction. In the motor of
The feature is that loss of the US cover can be avoided. In this type of motor, a wound core is used in the conventional punched core because the magnetic flux flows perpendicularly to the plate surface, resulting in a large loss.

On the other hand, in order to increase the output and downsize, it is required that the magnetic flux density of the motor teeth and the core back can be increased. In response to such requirements, conventionally, since it is a rotary machine, it is necessary to have uniform properties in all directions, so non-oriented electrical steel sheets have been exclusively used.
Co-Fe-based materials, which have non-directional characteristics and high saturation magnetization, are drawing attention. However, the problem is that this Co—Fe-based material is expensive and not suitable for practical use.

As described above, in the disk motor, the wound core is used, and it is required that the magnetic flux density in the length direction of the motor teeth, that is, the winding axis direction of the core can be increased, and the circumferential direction of the motor back yoke is That is, it is required that the magnetic flux density in the winding direction of the core can be increased. But,
Conventionally, non-oriented electrical steel sheets that have been mainly used have limitations, need to have a high magnetic flux density, and relatively low price.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a core for a rotating machine capable of increasing the magnetic flux density of a tooth or a back core in a motor core using a wound core, and a disk type rotating machine using the same. It was made for the purpose.

[0007]

The features of the present invention include (1) a core for a rotating machine, which is a core formed by winding a directional soft magnetic material, and (2) a wound core. The core for a rotating machine according to (1), wherein the easy magnetization direction is arranged in the winding axis direction of (3), (3) The core for a rotating machine according to (1), wherein the easy magnetization direction is arranged in the winding direction of the winding core, (4)
A core for a rotating machine according to (2) or (3), wherein a unidirectional electrical steel sheet is used as the directional soft magnetic material, and (5) a bidirectional electrical steel sheet is used as the directional soft magnetic material (2). Or a core for a rotating machine according to (3), (6)
A disk-type rotating machine using the core according to any one of (1) to (5).

The present invention will be described in detail below. The rotating machine in the present invention is an energy conversion between electricity and mechanical,
It uses or uses magnetic flux as a medium, and is used for motors (electric motors), generators (generators), generator generators, and similar devices, such as synchronous current transformers, synchronous phase shifters, and induction voltage regulators. In addition, it also includes a rotary transformer and a rotary sensor for detecting the rotational position. The motor may be any type of motor such as a brushless DC motor, a brushed DC motor, an induction motor, a synchronous motor, a reluctance motor, or the like. The generator may be any type of DC machine, induction machine, and synchronous machine.

In the present invention, the rotating machine requires a winding core. The core is an armature core or a field core, and further includes a field yoke. The winding core is formed by winding a coil-shaped or strip-shaped soft magnetic material, and the number of windings may be two or more or one, and if applicable, it is one or less and does not close. But good. The winding direction is the direction in which the core is wound as in Example 1 described later, and when the core material to be wound is a coil of magnetic material, it corresponds to the length direction.

When the core material to be wound is a coil made of a magnetic material, the winding axis direction corresponds to the width direction of the material, and is generally perpendicular to the winding direction. The soft magnetic material used for the core material is generally an electromagnetic steel plate or electromagnetic steel strip, and may be a silicon steel plate, a steel plate or steel strip containing almost no silicon, an iron plate, or another coil or a strip of soft magnetic material. The soft magnetic material of the present invention needs to have directionality. The directionality is the direction in which the easy magnetization axis is integrated in a certain direction, and at least the easy magnetization axis is at an angle within 15 degrees with respect to a certain azimuth and at least 1.5 with respect to a random distribution.
The direction that has more than double the degree of integration is called the direction. Of the directivities, unidirectional means that there is at least one azimuth indicating this directionality in the plane of the coil or strip, and bidirectional means that the azimuth indicating two directionalities. . Here, the direction opposite to a certain direction is the same in one directionality.

The easy axis of magnetization and the directionality of such a magnetic material may be shown before the core is wound, but after the core is wound and processed into a core, It may be annealed to finally show an easy axis of magnetization and directionality.

In the present invention, this winding core is used in the rotating machine, but the rotating shaft of the rotating machine is made to substantially coincide with the winding axis direction of the winding core, and as in the first embodiment, the main magnetic flux in the core is reduced. The flow must be in-plane with the core material. The angular difference between the rotation axis and the winding axis direction is determined by the relationship between the rotor and the stator gap. However, for the convenience of processing, when the angle becomes large, it is applicable if the main magnetic flux flow can be in the plane of the core material.

The orientation of the easy magnetization axis of the soft magnetic material may be aligned with the magnetic flux flow in the core. That is, in the case of the present invention, since the magnetic flux enters the core in the winding axis direction of the winding core, it is preferable to use the easy axis direction of magnetization of the soft magnetic material in that direction. That is, in the case of a unidirectional electrical steel sheet or a bidirectional electrical steel sheet, it is preferable to use the azimuth indicating the orientation. Further, when the magnetic flux passes in the winding direction like the back yoke portion of the core, the axis of easy magnetization may be aligned in that direction. That is, in the case of a unidirectional electrical steel sheet or a bidirectional electrical steel sheet, the azimuth indicating the directional property may be used as the winding direction. It is needless to say that the effect is large if the easy magnetization axes of the soft magnetic material are aligned in both the winding axis direction and the winding direction. For example, it is advisable to use a bidirectional electrical steel sheet and arrange two directional orientations in the winding axis direction and the winding direction. When it is required that the magnetic permeability in either the winding axis direction or the winding direction is particularly high, the magnetic permeability is required to be high in the direction of the easy axis of magnetization (directionality) such as the grain-oriented electrical steel sheet. It is better to align them in the direction you want.

The core of the present invention may be used as it is wound, but it may be a core which is formed by winding a magnetic material and then processed, or a core which is formed by slitting a magnetic material and wound. The core may be processed to have teeth like an ordinary rotating machine, or may be processed by caulking or the like for fixing or welded.

[0015]

【Example】

(Embodiment 1) FIG. 1 shows an embodiment of a core for a disk type brushless motor, and FIG. 2 shows an embodiment of a disk type brushless motor using the core. Reference numeral 1 denotes a winding core made by winding a bidirectional electrical steel sheet, and an arrow 2 indicates the winding direction of the winding core.

Arrow 3 indicates the winding axis direction of the winding core.
The easy axis direction of the magnetization of the bidirectional electrical steel sheet, that is, the directional direction is shown in 4, 5. In this embodiment, the winding direction 2 and the directional azimuth 4 of the bidirectional electrical steel sheet match, and the winding axis direction 3 and the directional azimuth 5 of the bidirectional electrical steel sheet match. The designed magnetic flux density of this core is as high as 1.9T, which is about 20% higher than that of the conventional non-oriented electrical steel sheet. FIG. 2 shows a schematic diagram of a disk type brushless motor that actually uses this core. 7 is a stator, 8 is a rotor, and the rotating shaft is 9. Rotor 8
Is composed of a field permanent magnet 6 and the core 1 of the present invention.

FIG. 3 is a sectional view taken along the line aa 'in FIG.
1 is a core of the present invention, which is a component 1 for connecting the core and the rotary shaft 9
1 is connected to the rotating shaft. A field permanent magnet 6 is attached to the surface of the core.

An armature winding 13 is fitted in the stator 7 in a stator frame 14. A bearing 17 that supports the rotating shaft of the rotor is attached to the center of the stator. The magnetizing direction of the magnet 6 is indicated by 15, and the magnetic flux in the direction of the arrow 16 flows through the core 1.

(Embodiment 2) FIG. 4 shows a disk type 2
A stator core 20 of a pole induction motor is shown, and an embodiment of an induction motor using this core is shown in FIG. The core 20 is made of a unidirectional electrical steel sheet (direction in which the winding direction is directional, that is, an axis of easy magnetization), and is processed into a tooth 2 by processing.
Made one. Therefore, the axis of easy magnetization of the core 20 is indicated by the arrow 23.
The magnetic permeability of the core back part is high, and the design magnetic flux density in this direction can be 1.9T. In the case of the conventional non-oriented electrical steel sheet, only 1.5T can be designed. The core thickness in the winding direction is 20
% Can be thinned. An armature winding 25 is wound around this core as shown in FIG. 5, and constitutes a stator 24.

On the other hand, the rotor 26 comprises a rotor core 27, a short winding 30, and a rotary shaft 31 which are made in the same manner as in FIG. Also in the rotor core, the easy-magnetization direction 29 of the unidirectional electromagnetic steel sheet is oriented in the winding direction, and the magnetic permeability of the back yoke portion is increased. The axial thickness of the disk-type two-pole induction motor can be reduced by the present invention.

[0021]

The present invention has found a means that has a higher magnetic permeability and a higher design magnetic flux density than conventionally used non-oriented electrical steel sheets. Conventionally, since each direction is used for a rotating machine, a grain-oriented electrical steel sheet, which has not been used, is used for a disk motor by using the direction of the easy axis of magnetization, that is, the azimuth of the directionality. Thus, the magnetic flux density of the motor can be increased, leading to higher output. Further, as in the second embodiment, the design magnetic flux density of the back yoke portion of the core can be increased, which is effective in thinning the disk motor. Furthermore, the easy-magnetization direction of the grain-oriented electrical steel sheet has less loss than the non-oriented electrical steel sheet, and the efficiency is
Can be quite high. This point was also unachievable with the conventional type, and is highly valuable from the viewpoint of energy saving. In terms of processing, it is almost the same as the conventional non-oriented electrical steel sheet, and there is no problem in motor manufacturing.

Recently, there has been a great demand for improving the performance of motors and the like, and the present invention plays a great role in achieving high output and thinning. As it stands, there are examples of using grain-oriented electrical steel sheets by reducing iron loss in large machines, but there is no example of making all cores with grain-oriented electrical steel sheets for the purpose of increasing magnetic flux density. The effect on the technology is very large.

The application of the present invention can be applied to a small and high output servomotor, and a robot for FA and an electric vehicle can be considered. The effect of increasing the output of the motor and downsizing is great.

[Brief description of drawings]

FIG. 1 is a front view and a side view showing a core for a disk type brushless motor.

2 is a schematic diagram of a disk type brushless motor using the core of FIG. 1. FIG.

FIG. 3 is a sectional view taken along the line aa ′ of FIG.

FIG. 4 is a diagram showing a stator core of a disk type two-pole induction motor.

FIG. 5 is a disk type two-pole induction motor.

[Explanation of symbols]

1 Winding core made by winding a bidirectional electrical steel sheet 2 Arrow showing the winding direction of the winding core 3 Arrow showing the winding axis direction of the winding core 4, 5 Easy magnetization axis direction of the bidirectional electrical steel sheet Shows the azimuth 6 Permanent magnet for field 7 Stator 8 Rotor 9 Rotating shaft 10 Motor support 11, 12 Parts connecting core and rotating shaft 13 Armature winding 14 Stator frame 15 Magnetization direction of magnet 6 16 Direction of magnetic flux 17 Bearings that Support Rotating Rotor Shafts 20 Induction Motor Stator Cores 21 Core Teeth 22 Centers of Winding Cores 23 Arrows that indicate the direction of easy axis of magnetization of the cores 24 Stator 25 Stator armature windings 26 Rotor 27 Rotor cores 28 Rotor core teeth 29 Direction of easy magnetization of unidirectional electrical steel sheet 30 Short winding 31 Rotation axis

Claims (6)

[Claims] 1. A core for a rotating machine, which is a core formed by winding a directional soft magnetic material. 2. The core for a rotating machine according to claim 1, wherein an easy magnetization direction is arranged in a winding axis direction of the winding core. 3. The core for a rotating machine according to claim 1, wherein an easy magnetization direction is arranged in a winding direction of the winding core. 4. The core for a rotating machine according to claim 2, wherein a unidirectional electrical steel sheet is used as the directional soft magnetic material. 5. The core for a rotating machine according to claim 2, wherein a grain-oriented soft magnetic material is a grain-oriented electrical steel sheet. 6. A disk type rotary machine using the core according to claim 1.