JPS61198705A - Coil device for electromagnet - Google Patents

Abstract

PURPOSE:To reduce a temperature gradient in windings by a method wherein a copper plate is wound on the surface of the winding on its midway of winding, a pipe for cooling is wound on the surface of the copper plate, the pipe for cooling is coated with a copper plate again and a winding continued to said winding is wound on the copper plate when the windings are wound on the outer circumference of a nonmagnetic bobbin and a coil for an electromagnet is manufactured. CONSTITUTION:An insulating coating wire is wound on a nonmagnetic cylindrical coil bobbin 1 with a pair of collar sections 11 projected in the diametral direction up to the centers of the projecting length of the collar sections 11 first, thus manufacturing a coil 21. A copper plate 3 having excellent thermal conductivity is wound on the surface of the coil 21, a cylindrical or square cylindrical copper pipe 4 is wound on the copper plate 3 and used as a water cooling pipe, and the surface of the pipe 4 is coated with a copper plate 5 again. A coil 22 connected to the coil 21 is wound on the copper plate 5, thus constituting a coil 2 by the coils 21 and 22. Accordingly, electromagnet itself can be cooled while a temperature gradient in the coil is reduced, thus minimizing the variation of magnetic flux density for a prolonged term.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnet coil device, and particularly to an electromagnet coil device having a cooling function.

[Conventional technology]

In an electromagnet used in a measuring device (eg, NMR, magnet meter, etc.), a water-cooled pipe is wound around the outermost surface of a coil device to cool the electromagnet.

Here, a conventional electromagnetic coil device having a cooling function will be explained with reference to FIG.

A coil 7 is formed by winding a winding Z around a cylindrical coil pobbin 6 made of a non-magnetic material and having a radially projecting flange 61. A cooling pipe 8 is wound around the outer circumferential surface of the coil 7 as shown in the figure, thereby configuring an electromagnet coil device. Then, cooling water is flowed into the cooling pipe 8,
It is designed to cool the electromagnet.

By the way, when manufacturing so-called anisotropic resin magnets by magnetic field molding, in order to increase the production efficiency of anisotropic resin magnets,
The mold cavity of the injection molding apparatus is configured so that a large number of resin magnets can be molded.

[Problems to be Solved by the Invention] However, when the mold cavity is configured so that a large number of anisotropic resin magnets can be molded, the cross-sectional area of the mold becomes large. Therefore, in order to impart a predetermined magnetic orientation to the resin magnet, the magnetic flux passing through the mold cavity must be increased. Therefore, it is necessary to increase the number of coil turns of the electromagnet attached to the injection molding apparatus, or to increase the current flowing through the electromagnet.

As the magnetic flux generated from the electromagnet increases, the amount of heat generated from the electromagnet inevitably increases. In the conventional electromagnet coil device described above, the cooling pipe is installed on the surface of the coil, so the temperature gradient inside the coil is extremely large, and as a result, the characteristics of the anisotropic resin magnet formed by magnetic field vary. When the injection molding apparatus is operated for a long period of time, the magnetic flux density fluctuates so much that it is necessary to stop energizing the electromagnet from time to time, which causes a problem in that the operating efficiency of the injection molding apparatus decreases.

Hereinafter, today [Means for solving the problem] A first copper material is applied to cover the first steel material 1.
A coil device for an electromagnet is obtained, characterized in that a water cooling pipe is wound around the outer side of the coil 4, and the water cooling pipe is further wound in succession.

〔Example〕

The present invention will be explained below with reference to Examples.

Referring to FIG. 1, a cylindrical coil bobbin 1 is formed of a non-magnetic material and has a pair of radially stretched flanges 11.
Winding wire 2 is wound around. After winding the winding 2 almost to the center of the length of the flange 11 (hereinafter, this part will be called the coil 2).
Set to 1. ), a copper plate 3 with good thermal conductivity is wound around the coil 21.

Note that copper foil may be wound around the edge of the copper plate 3 in multiple layers. A cylindrical or rectangular copper pipe 4 is wound around the copper plate 3 as shown in the figure, and cooling water is pumped in from the end of the copper pipe 4 at the beginning of the winding.

Cooling water will be sent out from the end of the winding.

A copper plate 5 is wrapped around the outer peripheral surface of the copper vibe 4.

The winding wire 2 is subsequently wound on the copper plate 5 (hereinafter, this portion will be referred to as a coil n), thereby constructing a coil device for an electric or magnet.

Attach a magnetic core to the electromagnetic coil device described above.

When cooling water flows through copper pipe 4 as an electromagnet.

Coils 21 and 22 are cooled via copper plates 3 and 5, respectively. Therefore, the temperature gradient inside the coil is extremely small, and there is little variation in magnetic flux density even during long-term operation. When this electromagnet is used in the injection molding apparatus described above, since the temperature gradient inside the coil is extremely small, variations in the characteristics of the anisotropic resin magnet formed by magnetic field molding are unlikely to occur.

〔Effect of the invention〕

As explained above, when the electromagnetic coil device according to the present invention is used, the electromagnet itself is cooled and the temperature gradient inside the coil is extremely small, so there is an advantage that there is little variation in magnetic flux density over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of an electromagnet coil device according to the present invention, and FIG. 2 is a sectional view showing a conventional electromagnet coil device. 1... Coil bobbin, 2... Winding wire, 3, 5... Copper plate. 4...Copper pipe, 6...Coil bobbin, 7...Coil. 8...Cooling pipe.

Claims (1)

[Claims] 1. In an electromagnetic coil device in which a winding wire is wound around a non-magnetic bobbin, a first copper member with good thermal conductivity is placed on the outside of the winding wire in the middle of winding the winding wire so as to cover the winding wire. was applied,
A cooling pipe with good thermal conductivity is wound around the outside of the first copper member, and a second copper material with good thermal conductivity is applied to cover the cooling pipe, and a second copper material with good thermal conductivity is applied on the second copper material. A coil device for an electromagnet, characterized in that the winding wire is continuously wound on the coil device.