JPS58212360A - Brushless motor - Google Patents

Abstract

PURPOSE:To obtain a brushless motor having high efficiency adapted for an industrial robot by mounting a magnetic wire of amorphous alloy in a cylindrical coil to form a stator and internally mounting a permanent magnet rotor. CONSTITUTION:A core 2 made of amorphous magnetic wire is wound on the outer periphery of a cylindrical coil 1, and the outer periphery of the core 2 is molded with resin to form a frame 3. Brackets 4, 5 are provided at both ends of the frame 3, and rotatably hold a permanent magnet rotor 8 through bearings 6, 7. An amorphous magnetic wire is used for the core 2, thereby extremely improving the magnetic characteristics and efficiency and reducing the size together with weight.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless motor structure that is small, lightweight, and highly efficient.

BACKGROUND ART In recent years, easy-to-control brushless motors have been conveniently used in robots and the like, and such motors are required to be smaller and lighter in weight.

In addition, various motor outputs and shapes such as external shapes are required, and the structure must be able to easily meet these conditions.

The present invention was made in view of these circumstances.
- The purpose of the present invention is to provide a brushless motor that is highly useful and convenient to manufacture as a motor for use in industrial robots, etc.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings. The figure is a longitudinal sectional view of essential parts showing an embodiment of a brushless motor according to the present invention.

In the figure, the brushless motor has an iron core 2 made of amorphous magnetic wire wrapped around the outer periphery of a cylindrical coil 1, and the outer periphery of the iron core 2 is molded with resin or the like to form a frame 3.
is formed.

Brackets 4 and 5 are provided at both ends of the frame 30, and rotatably hold a permanent magnet rotor 8 via bearings 6 and 7.

Further, this brushless motor includes a position detector (not shown), which is also connected to an external drive power source (not shown).

Since such a brushless motor uses an amorphous magnetic wire for the iron core 2, it has extremely good magnetic properties and can be made more efficient, so it can be made smaller and lighter.

By appropriately changing the diameter, overall length, wire diameter, etc. of the cylindrical coil 1, brushless motors with various outputs and D shapes can be easily rotated.

That is, since the amorphous magnetic wire is wound around the outer periphery of the cylindrical coil 1 in a V4 design, the width and amount of the winding can be easily adjusted at the time of winding.

Furthermore, since the frame 3 is formed by molding of resin or the like, it can easily accommodate changes in the irregularities and dimensions of the cylindrical coil 115 amorphous magnetic wire.

In particular, it is convenient because it can be formed into an external shape that easily accommodates attachment to a robot, etc., and has good electrical insulation properties, which can further improve reliability.

In such a brushless motor 14, an amorphous magnetic wire is wound around the outer periphery of the cylindrical coil 1 using a cylindrical jig, and molded with resin or the like in this state or with the jig removed.

-3- By manufacturing in this way, it is possible to form a stator core with low magnetic resistance without creating too much wasted space between the magnetic wires.

If an amorphous magnetic wire with a rectangular cross section is used, when it is wound in this way, there will be no wasted space that would cause magnetic resistance, and in combination with the magnetic properties of the amorphous alloy, an effective brushless motor can be created. Obtainable.

Moreover, by winding the amorphous magnetic wire in a spiral shape and repeatedly reciprocating it in the axial direction, it is easy to construct a dense stator core as a whole, although there may be some irregularities at both ends.

Generally, amorphous magnetic wire has a thin linear shape and must be wound with a large degree of winding.
It is not difficult to rotate it at high speed, and it is also easy to wind it using an automatic machine. :・□ IHing the wire material to the cylindrical coil 1 is extremely convenient in terms of manufacturing, and not only can it be made into a long and slender low-inertia motor, but it can also be made from the same material by simply changing the specifications of the cylindrical coil 1. Many types of motors can be manufactured using this.

However, if the iron core 2 is constructed by winding a wire around the cylindrical coil 1, the space factor will differ depending on the winding method and material.

However, depending on the winding method, it is as follows.

(1) Regular winding of round wire is 78% (2) Linear winding of round wire is 91% (3) Linear winding of square wire is 100% Also, it changes depending on the tightening force during winding.

For this reason, magnetic flux penetration in the radial direction of the iron core 2, so-called perpendicular magnetization, tends to deteriorate.

Furthermore, due to the principle of magnetic flux penetration, the problem tends to worsen as the rotational speed increases, which causes problems for devices with a wide control range, such as industrial robots.

However, by adopting an amorphous alloy and using this as the magnetic wire material, the characteristics of magnetic flux penetration become extremely good.

In other words, the difficulty of perpendicular magnetization is expressed by the following formula % formula % Here, μa: AC permeability of perpendicular magnetization μd: magnetic flux due to perpendicular magnetization ρ: wire resistivity f: Fluctuation frequency of heavy magnetization to: constant shall be.

By using an amorphous magnetic wire under such conditions, μd1ρ can be increased due to the characteristics of the amorphous alloy.

That is, the amorphous magnetic wire is an amorphous alloy, and it can be understood that the magnetic resistivity is about 3 to 4 times that of ordinary electromagnetic steel sheet.

Moreover, the fact that μd is large means that the DC magnetic permeability of the amorphous magnetic material itself is extremely high, which is comparable to the magnetic permeability of permalloy and more than 10 times that of an ordinary Ill steel plate.

-6- Therefore, if an amorphous magnetic 1S material with a rectangular cross section is used, the contact area between the wires increases and the magnetic resistance decreases.

Therefore, μd increases further.

On the other hand, due to the nature of the amorphous alloy, the surface roughness of the magnetic wire is small, that is, the surface is smooth, and the tensile strength is about four times or more than that of ordinary steel, making it possible to wrap it extremely densely.

In this way, even wire rods can be tightly wound, and a motor with high performance can be easily obtained by utilizing the characteristics of the amorphous alloy without deteriorating the characteristics.

In particular, it is extremely versatile as a motor for industrial robots and the like because it can be constructed to be long and thin with low inertia and can be easily adapted to various shapes.

As explained below, according to the present invention, a highly efficient brushless motor can be obtained because the magnetic wire made of amorphous alloy is wound around a cylindrical cone.
For example, it is extremely useful as a lift motor for industrial robots, and its effects are great.

[Brief explanation of drawings]

The figure is a longitudinal plan view of essential parts showing an embodiment of a brushless motor according to the present invention. 1... Cylindrical coil, 2... Iron core, 3...
Frame, 8...Permanent magnet rotor. Patent applicant Shibaura Seisakusho Co., Ltd.:・. -8- Procedural amendment writing method) % formula % 1. Indication of the case Patent Application No. 92135 of 1982 2. Name of the invention Brushless motor 3. Person making the amendment (Relationship with 1 Patent applicant address Tokyo Port Akasaka 1-1-12 @3I/(Fura)
℃I Lifso 1 Name (242) Shibaura Seisakusho Co., Ltd. 4, voluntary correction of the date of correction order

Claims (2)

[Claims] (1) A brushless motor characterized in that a stator is formed by winding amorphous magnetic wire I around the outer periphery of a cylindrical coil, and a permanent wire is installed inside. (2) A patented brushless motor characterized by using an amorphous magnetic wire with a rectangular cross section.