Magnetic path and manufacturing method and device thereof
A manufacturing method and a manufacturing device technology, which are applied in the fields of magnetic circuits and their manufacturing and manufacturing devices, can solve problems such as yield obstacles, and achieve the effects of high productivity, low cost and productivity
Inactive Publication Date: 2012-10-24
TDK CORPARATION
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- Abstract
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Problems solved by technology
Considering the increase in performance and miniaturization of the actuator, the above-mentioned reduction in yield is a major factor hindering it.
Method used
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Embodiment Construction
[0038] Embodiments of a magnetic circuit to which the present invention is applied, a manufacturing method thereof, a manufacturing apparatus, and an actuator or a speaker incorporating the magnetic circuit of the present invention will be described in detail below with reference to the drawings.
[0039] First of all, it is a permanent magnet incorporated in the yoke part of the magnetic circuit. In the present invention, instead of using a cylindrical magnet, it has a shape divided into several, that is, the cross-sectional shape is a partial arc shape. permanent magnet sheet (C-type permanent magnet sheet).
[0040] The orientation direction of the C-shaped permanent magnet piece may be parallel to the width direction (a direction substantially perpendicular to the above-mentioned partially arc-shaped cross-section), or may be the thickness direction, but for example, in order to facilitate the arrangement in the center of the actuator The coils of the part converge the mag...
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Abstract
The invention is to efficiently produce a high-performance small-sized magnetic circuit capable of facilitating the insertion of a magnet into a magnetic yoke member. In the inventive magnetic circuit, a plurality of permanent magnet sheets (1), with a partially arced sectional shape, are magnetically absorbed on an inner circumferential surface (4a) of a cylindrical magnetic yoke member (4), andsimultaneously a fold-back portion (4b), adapted to be folded back at a substantially right angle, is formed at one end side of the cylindrical magnetic yoke member (4), and the end surfaces of the permanent magnet sheets (1) are also magnetically absorbed with respect to the fold-back portion (4b). The inventive magnetic circuit is fabricated by magnetically absorbing the permanent magnet sheetswith the partially arced sectional shape (C-shaped permanent magnet sheets 1) to the circumferential surface of a central bar (2) made of magnetic materials, and arranging the magnetic yoke member (4) oppositely to the C-shaped permanent magnet sheets 1 under this conditions; and then drawing the central bar (2) under such condition that the C-shaped permanent magnet sheets 1 are positioned by using a non-magnetic supporting tool (3), and allowing the C-shaped permanent magnet sheets 1 to be magnetically absorbed and fixed on the magnetic yoke member (4). The inventive magnetic circuit is used in actuators or loud-speakers.
Description
technical field [0001] The present invention relates to a magnetic circuit used in a magnet-type actuator that converts electrical energy into kinetic energy, a manufacturing method, and a manufacturing device thereof, and an improvement in a method of incorporating a permanent magnet into a yoke member. Actuators or speakers using magnetic circuits are also involved. Background technique [0002] For example, various types of actuators have been developed in various office automation equipment, linear motors (voice coil motors), control equipment, and the like. Specifically, it is a movable actuator such as a coil or an iron core, or an actuator with a movable permanent magnet. In any case, the actuator is constituted by combining a yoke, a coil, and a permanent magnet. [0003] In actuators using permanent magnets, high-precision control and improvement of propulsion force have become issues, and attempts have been made to respond to them by changing the structure. For ...
Claims
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IPC IPC(8): H01F7/00H01F41/02H02K33/18H04R9/06
Inventor 齐藤重男田中光利三竹晃司
Owner TDK CORPARATION