JPH03225805A - Electromagnetic driver and electromagnetic generator - Google Patents

Abstract

PURPOSE:To obtain an electromagnetic driver and electromagnetic generator with good response properties, of low cost and arbitrary shape and involving no mechanical problem by using in a yoke a magnetic material assembly composed of a shaped body combining magnetic materials, where a seizing condition exists between the materials. CONSTITUTION:A magnetic material assembly composed of a shaped body made by combining magnetic materials, where a seizing condition exists between the materials, is used in a yoke. These magnetic materials are made by the use of flat rolled magnetic steel sheets and strip such as silicon steel plate, soft magnetic iron sheets, common steel, etc., and iron-nickel alloy, iron-cobalt alloy and other magnetic materials. These magnetic materials are not limited also in shape. Further, the combination of two kinds or more of the magnetic materials can be used in addition to only one kind of such materials. Thus, it is possible to obtain an electromagnetic driver and electromagnetic generator excellent in response properties, of low cost, small size and arbitrary shape and involving no mechanical problem.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electromagnetic drive device and an electromagnetic power generation device.

[Prior Art] In electric motors and generators, many magnets are used for magnetic fields, and yokes are also used to make the field distribution appropriate.

Recently, electric motors and generators are required to be more responsive and more compact. However, even if a voltage is applied to drive the motor, the response of the drive current is slow due to the inductance of the armature coil used in the motor, making it impossible to control the motor as desired. A speaker is a type of electric device, and in order to obtain good sound quality, it must have good responsiveness, and it is important that it exhibits the same responsiveness at all audible frequencies.

In the case of this speaker as well, if there is impedance in the moving coil, the response will be slow and the frequency characteristics in the audible range will be uneven, resulting in poor sound quality. In the case of power generation devices such as generators and microphones, in order to draw out the electric power and induced voltage generated in the armature coil and moving coil, it is necessary to have a large inductance of the coil, so that the electric power and voltage can be drawn out instantaneously and efficiently. I can't take it out.

On the other hand, there is a great need for miniaturization of electric motors, etc., and there is also a need for them to be made to fit the equipment space, and the yokes of magnets used in electric motors are also required to be miniaturized and have a complicated shape. However, obtaining a small yoke with an arbitrary shape increases the cost, and conversely, even if a small yoke with an arbitrary shape can be obtained, the magnetic circuit characteristics and mechanical strength are poor.

As a conventional method, there is a method of providing a coil to reduce the inductance as in Japanese Patent Application Laid-Open No. 57-28563, but the structure becomes complicated. Controlled improvements in responsiveness result in
The circuit becomes complicated and costs increase. Yoke of arbitrary shape is made by lost wax method or powder metallurgy method, and there are some electric motors that use these yokes for field purposes, but there are many problems in terms of magnetic properties and cost. There is also a method of using laminated steel plates, but if the shape is complex or small, mechanical strength and maintenance will be difficult, and vibrations may occur when the device is driven. Using adhesives to provide mechanical strength solves this problem, but
The heat generated during operation of the device may cause problems for the device, such as deterioration of mechanical strength or generation of outgas.

As described above, there are no electromagnetic drive devices or electromagnetic power generation devices using conventional yokes that have excellent responsiveness, are low cost, small in size, have arbitrary shapes, and have no mechanical problems.

[Invention or Problem to be Solved] The present invention solves the problems of the prior art described above, and provides an electromagnetic drive device or an electromagnetic power generation device that has good responsiveness, is inexpensive, has an arbitrary shape, and has no mechanical problems. It was done for that purpose.

[Means for solving the problems] The features of the present invention are as follows: 1. [A magnetic material aggregate made of a formed body made by combining magnetic materials, and in which the magnetic materials are in a state of burning between the materials is used for the yoke. An electromagnetic drive device and an electromagnetic power generation device characterized by:

2. The electromagnetic drive device and electromagnetic power generating device according to the above item 1, which is a magnetic material aggregate formed by combining magnetic materials such that the axis of easy magnetization of the magnetic materials follows a predetermined magnetic flux flow.

3. If! 1. The electromagnetic drive device and electromagnetic power generating device according to item 1, which is a magnetic material aggregate formed by combining magnetic materials arranged so as to follow a predetermined magnetic flux flow.

4. The electric & fi driving device and the electromagnetic power generating device according to the above item 1, 2 or 3, wherein the magnetic material has a plating layer of a conductive material.

It is in.

The present invention will be explained in detail below.

First, electromagnetic drive devices have armature coils and moving coils, and fields generated by permanent magnets, electromagnets, and field coils! ffIIf! The driving force is generated by the current flowing through the coil. The electromagnetic generator is
Electric power and induced voltage generated in armature coils and moving coils are extracted by field magnetic flux generated by permanent magnets, electromagnets, and field coils. That is, the electromagnetic drive device and the electromagnetic power generation device refer to general electric motors, generators, linear type devices, actuators, speakers, microphones, and the like.

The magnetic material aggregate used in the electromagnetic drive device and electromagnetic power generation device of the present invention includes magnetic steel sheets such as silicon steel sheets, electromagnetic soft iron, common steel, iron-nickel alloys, iron-cobalt alloys, etc. Made using magnetic materials. There are no restrictions on the shapes of these magnetic materials, and the types and shapes of magnetic materials may not be one, but a combination of two or more types.

The magnetic material used in the magnetic material assembly is adjusted so that the magnetic easy axis of the magnetic material is aligned, the arrangement, shape, etc. It is good to consider the type. For example, in the case of iron, the easy axis of magnetization is the crystal orientation [100], and this orientation may be made to follow a predetermined magnetic flux flow. Or a board,
In the case of a wire magnetic material, the magnetic material may be arranged in a direction parallel to the surface of the magnetic material, or in the length direction, or along a predetermined magnetic flux flow. As a result, it becomes possible to obtain ideal magnetic circuit characteristics.

It is necessary for the magnetic material assembly to have sufficient adhesion between the magnetic materials, to reduce the interlayer electrical resistance between the materials, and to have high mechanical strength. Through annealing, this magnetic material aggregate is not only able to sufficiently bake between the magnetic materials, reduce interlayer electrical resistance, secure a predetermined shape, and obtain mechanical strength. It is preferable that the resulting processing strain is also released at the same time.

In order to make the magnetic material assembly sufficiently burn-in between the magnetic materials, reduce the interlayer electrical resistance between the materials, and have high mechanical strength, before causing the burn-in between the magnetic materials, It is effective to use a magnetic material whose surface is plated with a conductive material. By using a material whose surface is plated with a conductive material, it is possible to reduce the electrical resistance between the combined magnetic materials, and the plated conductive material is less likely to seize than the unplated magnetic material. If it is easy, higher mechanical strength can be obtained. As the conductive material plated on the surface of the magnetic material, copper, aluminum, nickel, tin, zinc, etc., and alloys thereof can be used. The plating thickness is
It is preferable that the thickness is necessary to reduce the electrical resistance between the combined magnetic materials, promote sticking between the materials, and ensure sufficient mechanical strength of the magnetic material combination formed body. The type of conductive material to be plated on the surface of the magnetic material needs to be determined depending on the difficulty of plating and the required magnetic circuit characteristics.

When a magnetic flux is caused to flow in a direction perpendicular to the surface of a magnetic material, it is preferable to select a conductive material plated with a material with excellent magnetization properties, such as nickel, to form a magnetic material aggregate. On the other hand, when flowing magnetic flux parallel to the surface direction of a magnetic material such as a plate or wire, a material plated with a non-magnetic conductive material may be used. If the purpose is achieved, the plated magnetic material may not be used entirely, but only a portion of the plated material may be used, or a portion of the plated magnetic material may be used.

Electromagnetic drive devices and electromagnetic power generation devices that use the magnetic material aggregate made as described above in the yoke of the field magnet are
The impedance of armature coils etc. is lower, controllability is better, responsiveness is better, they are cheaper, have fewer mechanical problems, and can be made in a predetermined shape and size.

[Example 1] Fig. 1 shows a speaker in which a yoke is made of a magnetic material formed by laminating and molding a silicon steel plate with conductive plating. 1.2 is 1μ on the surface of silicon steel plate without coating.
This material is made of copper plating with a thickness of 0.01 μm and tin plating of 0.1 μm on top of that, and is laminated and baked in hydrogen at 900°C for 2 hours. 3 is its plating layer; 4.
5 shows the obtained yoke. 6 is a permanent magnet that generates field magnetic flux. 7 has its movable coil 1.8, and when a current is passed through the movable coil 7, a driving torque acts on the cone radiator 9 through the hobbin 8, causing it to vibrate in the direction 11.

In this speaker, the field magnetic flux generated by the permanent magnet is transmitted along the silicon steel plate 1.2 that constitutes the yoke 4.5.
It can flow in the direction of the IO arrow. Further, since the yoke 4.5 is made of conductive plating between layers of silicon steel plates, its electrical resistance is low.

[Effects of the Invention] In this way, the magnetic material aggregate obtained by plating a magnetic material with a conductive material and bringing it into a baked-in state has a small interlayer electrical resistance, and it is also possible to use a conductive plating material. Because of this, the electrical resistance is reduced. Therefore, when used in a yoke such as a field magnet of an electromagnetic drive device, even if a current is applied to the armature coil or moving coil and an attempt is made to change the field magnetic flux, the electric resistance of the yoke is low. Eddy currents tend to flow through the yoke and work to control changes in the field Mi. Therefore, the voltage induced in the coil of the electromagnetic drive device becomes small, the coil interface becomes small, current control becomes easy even when voltage is applied, and current responsiveness improves. Furthermore, since the field magnetic flux is difficult to change, an induced torque proportional to the coil current is generated, and the electromagnetic drive device has excellent responsiveness. Similarly, when such a magnetic material is used in an electromagnetic power generation device, the inductance of the coil is lowered and changes in field magnetic flux are reduced, so that electric power and induced voltage can be extracted with good responsiveness.

In addition, such a magnetic material aggregate can provide the magnetic circuit characteristics required for the yoke of an electromagnetic drive device or an electromagnetic power generation device by combining the magnetic materials in consideration of their magnetic easy axes and shapes. Since this yoke is finally subjected to an annealing process, no processing strain remains and it provides good magnetic properties. Furthermore, by combining magnetic materials such as plates, wires, and particles into a shape that suits the purpose, molding it, and baking it, it is possible to obtain a small, tailored-shaped yoke. This means that an electromagnetic drive device or electromagnetic generator of the appropriate shape and size can be obtained at low cost. The mechanical strength required for electromagnetic drives and electromagnetic generators can also be achieved by taking seizure strength into consideration.

[Brief explanation of drawings]

FIG. 1 shows a speaker in which a yoke is made of a magnetic material made by laminating, molding, and baking a silicon steel plate with a magnetic material coated with conductive plating. 1.2...Silicon steel plate, 3...Plating layer, 4.5...
・Yoke, 6... Permanent magnet, 7... Moving coil, 8
... Pohin, 9... Corn radiator, I O-.
-Magnetic flux flow, 11...imaging direction of cone radiator.

Claims (4)

[Claims] 1. An electromagnetic drive device and an electromagnetic power generating device characterized in that a yoke is made of a magnetic material aggregate made of a combination of magnetic materials, and the materials are in a burned-in state. 2. 2. The electromagnetic drive device and electromagnetic power generating device according to claim 1, which is a magnetic material aggregate formed by combining magnetic materials such that the axis of easy magnetization of the magnetic materials follows a predetermined magnetic flux flow. 3. The electromagnetic drive device and electromagnetic power generation device according to claim 1, wherein the electromagnetic drive device and the electromagnetic power generating device are magnetic material aggregates formed by combining magnetic materials arranged so as to follow a predetermined magnetic flux flow. 4. The electromagnetic drive device and electromagnetic power generating device according to claim 1, 2 or 3, wherein the magnetic material has a plating layer of a conductive material.