JP2000261991A - Electric coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the conductor space factor and dimensional accuracy of an electric coil by slitting a copper foil having thereon a very thin laminated plastic film into the copper foils having prescribed widths to create a conductive tape, and by winding the conductive tape without clearance around a winding core such as a ceramic core. SOLUTION: On a copper foil having a thickness of 20 μm, a polyethylene naphthalate film having a thickness of 1.3 μm is laminated, and the laminated film coated further with a thermally fused layer having its thickness of 1-1.5 μm is slit into the ones having their widths of 6 mm to create a conductive tape 4. Then, around an alumina made winding core 1, having its external shape dimension of 20 mm minor side and 80 mm major side and 6 mm thickness, where fastening screw holes 2 are provided in its two places and holes 3 for coolant are provided at three places, 800 turns of the conductive tape 4 are wound to create a rectangular coil. As a result, a coil having a high conductor space factor and dimensional accuracy nearly equivalent to the conductive tape 4 are obtained. Also, by constituting the winding core of an insulator, eddy current, etc., generated in the winding core are eliminated to facilitate the control of a magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, a transformer,
The present invention relates to an electric coil used for a solenoid or the like, and particularly to a rectangular coil which has recently been frequently used for a linear motor or the like.

[0002]

2. Description of the Related Art Many conventional coils are formed by winding a round magnet wire around a cylinder. When a rectangular coil is made of the round wire, it is difficult to obtain dimensional accuracy of the coil, and it is difficult to precisely position the coil. When a round wire is wound in a bale stack, it is difficult to improve the conductor space factor to increase the efficiency of the coil. There has been a growing demand for a new rectangular coil which has a high conductor space factor, good dimensional accuracy, a large ratio of the short side to the long side, and can be designed freely.

[0003]

A rectangular coil used in a linear motor or the like has a high space factor of a conductor (copper or the like), has a high dimensional accuracy of the coil, and can be freely designed with a short side to long side ratio. In order to provide a coil having a structure that can fix a coil that can take a large ratio with high positional accuracy, and that can fix an external force applied to the coil so that it does not deform the coil body, and that can be sufficiently cooled by a cooling medium, a conventional round coil is used. It is an object of the present invention to provide a practically usable rectangular coil using a conductive tape having a minimum necessary insulating layer instead of a wire.

[0004]

In order to increase the space factor of a conductor (copper, etc.), an ultra-thin plastic film is formed on a metal foil such as a copper foil without any defects such as wrinkles and pinholes, and a strong adhesive force. In order to obtain the dimensional accuracy of the coil to be laminated, the conductive tape slit to a predetermined width by a method without burrs, return, etc. on the cut cross section is wound around a core core of the same thickness as the tape width by a predetermined number of turns By firmly bonding between the conductive tape and the core of the core by appropriate heat treatment, a rectangular coil having high dimensional accuracy and free ratio of short side to long side can be obtained. The coil is mounted by providing mounting holes and the like in the core core to obtain mounting dimensional accuracy and supporting external force applied to the coil to prevent deformation of the coil body due to external force. A passage for flowing a cooling medium for cooling is provided in the core to cool heat generated due to an increase in energy density applied to the coil due to an increase in the conductor space factor.

[0005]

A conductive tape obtained by slitting a copper foil laminated with an ultra-thin plastic film to a predetermined width can be wound around a core core without any gap to obtain a high conductor space factor. By arranging and winding a conductive tape with a width accuracy of 1/100 mm or less, the dimensions of the coil have the same dimensional accuracy as the conductive tape, and variations between products are as accurate as the conductive tape. You. The space between the conductive tapes or between the core and the conductive tape is firmly fixed by heat treatment, and the coil is fixed to the equipment with the core so that the ultra-thin film insulating layer is not damaged and is highly occupied. The mechanical load on the moment coil is not required. By configuring the winding core with an insulator, eddy current loss or the like generated in the winding core is eliminated, and the control of the magnetic field is facilitated. In addition, heat generated due to an increase in energy per volume consumed by the coil accompanying the improvement of the space factor can be efficiently cooled by throwing a passage of a cooling medium into the core. . And the like.

【Example】

First Example A polyethylene naphthalate film having a thickness of 1.3 μm is laminated on a sinus foil having a thickness of 20 μm, and further laminated with a film having a thickness of 1 to 1.5 μm.
A conductive tape was prepared by slitting a film coated with a heat-sealing layer of No. 6 into a width of 6 mm. Using the conductive tape, an alumina core core provided with two screw holes for fixing the coil and three through holes for the passage of the cooling refrigerant with external dimensions of short side 20 mm long side 80 mm thickness 6 mm The conductive tape was wound 800 times to form a rectangular coil. (See FIG. 1) The coil thickness measured after the predetermined heat treatment was 6.0.
At 2 mm, the parallelism was within 0.03 mm. The conductor space factor of the cross section calculated from the winding thickness of the coil was 89%. The thickness of the core was possible up to ± 0.5 mm of the width of the conductive tape. Also, coil mounting dimensional accuracy is ±
0.02 mm could be secured. The three holes for the cooling medium provided in the alumina core were sufficient to ensure the circulation amount and the uniformity of the circulation of the cooling medium.

Second Example A polyethylene naphthalate film having a thickness of 1.3 μm is laminated on a 70 μm-thick foil, and then 1-1.5 μm
A conductive tape was prepared by slitting a film coated with a heat-sealing layer of No. 10 into a width of 10 mm. The above conductive tape has an outer dimension of 10 mm on a short side, 100 mm on a long side and a thickness of 14 mm,
A rectangular coil is formed by winding 240 times around a glass fiber-filled epoxy resin core in which two cooling fins having a width of 3 mm and a height of 4 mm serving as two cooling screw holes and a passage for a cooling medium are arranged in the longitudinal direction. Was. (See FIG. 2) The coil subjected to the predetermined heat treatment was confirmed to have the same dimensional accuracy as the first example. For comparison, an equivalent rectangular coil was made with a 0.5 mmφ magnet wire, but the coil could not be formed because the linearity of the long side could not be secured. The coil mounting position accuracy and the effect of the passage for the cooling medium were the same as in the first example.

[0008]

According to the present invention, a rectangular coil having a high conductor space factor, good dimensional accuracy, little variation between products, and a freely designable shape can be formed of a conductive tape using a metal foil such as a copper foil with an insulating material. It has been found that the core and the core can be supplied with high productivity by fixing the tape and the core by a predetermined heat treatment. The core has a mounting hole for fixing the coil with high positional accuracy. Large electric power can be applied to the coil by arranging a hole through which a cooling medium with a cooling effect is passed, and significant results can be obtained by reducing the size and weight of linear motors, improving performance, and improving the electromagnetic conversion efficiency of various transformers. . By developing the coil of the present invention in various fields, contribution to future energy problems can be expected.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric coil according to the present invention (Example 1).

FIG. 2 is a perspective view of an electric coil according to the present invention (Example 2).

[Explanation of symbols]

 1 is a ceramic core 2 is a fixing hole 3 is a cooling medium hole 4 is a conductive tape 5 is a winding start lead wire 6 is an end winding lead 7 is an epoxy resin core with glass fiber 8 is a cooling fin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H002 AA03 AA07 AA08 AA10 5H603 AA01 AA03 AA09 AA11 BB01 BB15 CB01 CB11 CB16 CB22 CC18 CD21 CE06 CE13 FA02 5H641 GG05 GG06 GG11 GG12 JB02

Claims (1)

[Claims] 1. An electric machine wherein a metal foil such as a copper foil having a plastic film laminated on one or both sides thereof is coated with a heat-sealing agent and a conductive tape slit to a predetermined width is wound around a rectangular core. Insulation coil, using an insulator such as plastic or ceramic for the core,
An electric coil characterized in that the core has an attachment hole for ensuring the positional accuracy of the coil and a cooling medium passage hole for cooling the coil.