JPH0723939Y2 - Coil with cooling passage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a coil having a passage for a cooling medium inside, and in particular, the cooling action by the cooling medium flowing in the passage is effectively performed. It is a thing.

[Prior Art] In Fig. 1, after winding a first portion (inner portion) 2a of a coil 2 around a winding frame 1, spacers 3 are arranged at a predetermined interval on the outer circumference, and the remaining second portion is placed on the outer side thereof. Part (outer part) 2b
Is wound, the insulating layer 4 is provided on the outermost side, and the winding of the coil 2 is completed.

[Problems to be solved by the device]

In this case, a cooling medium is circulated through a passage formed in the axial direction of the coil between the spacers 3, that is, the duct 5, to cool the coil. In the past, an insulating material was used for the spacer 3. Therefore, since the spacer 3 is a poor conductor of heat, there is almost no heat radiation from the contact surface of the coil 2 with the spacer 3 to the cooling medium, and only the surface excluding the contact surface with the spacer is an effective heat radiation surface. However, high cooling efficiency was not obtained.

Further, the coil 2 is arranged so that the duct is arranged in the vertical direction from the viewpoint of the cooling structure. However, in the structure in which the heat transfer in the vertical direction of the coil is poor, the temperature difference between the upper and lower sides of the coil becomes large and the local heating It was the cause.

[Means and Actions for Solving Problems]

In order to solve the above-mentioned drawbacks, the present invention uses a good conductor of heat, such as aluminum, for the spacer, and dissipates the heat of the contact surface between the coil and the spacer by the heat conduction of the spacer, thereby achieving effective cooling. It was done.

〔Example〕

In FIG. 1, the spacer 3 is replaced by a spacer made of a good heat conductor such as aluminum instead of the conventional insulator, that is, a poor heat conductor. However, in this case, since the spacer is an electric conductor, it cannot be left as it is.
It is necessary to connect to the end of winding of the portion 2a or the start of winding of the second portion 2b to fix the potential.

In this way, the heat of the coil 2 is also transferred from the contact surface with the spacer 3 and is dissipated from the spacer 3 into the cooling medium, and the entire surface of the coil 2 serves as a heat dissipation surface for effective cooling.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention, in which pipes 6 made of a good heat conductor are arranged outside the first portion 2a of the coil at a predetermined interval, and the rest of the coil is outside the pipe. Wind the second part 2b of. In the figure, the pipe 6 is a square pipe as an example.

A good heat conductor, that is, a metal pipe is used as the pipe 6, but since it is an electric conductor as a matter of course, the winding end of the first portion 2a of the coil or the second portion 2b is appropriately made by a lead wire or the like as in the above embodiment. Connect at the beginning of winding and fix the potential.

In this way, the first part 2a and the second part 2b of the coil are
A duct 5 is formed between the pipe 6 and the pipe 6, and a cooling medium is circulated in the pipe 6 together with the duct 5. Thus, the coil 2 is cooled by the cooling medium flowing in the duct 5 and the pipe 6, and the contact surface of the coil 2 with the pipe 6 also acts as a heat radiating surface for effective cooling, and the spacer is lightweight. Can be realized. Incidentally, FIG. 3 shows a partial sectional view of an embodiment using the round pipe 7 made of a good heat conductor.

Here, the pipes 6 and 7 do not necessarily have to be arranged at intervals, and can be arranged continuously. However, if pipes made of metal, that is, an electric conductor, are continuously arranged as good heat conductors, they come into contact with each other in the circumferential direction and
There is a risk that a turn circuit will be formed and a short-circuit current will flow, and an overcurrent due to leakage magnetic flux will flow between the pipes and there will be a risk of local overheating.

Therefore, for example, as shown in FIG. 4, the metal pipes 7 and the insulating pipes 8 of circular shape and the same diameter are alternately arranged, or as shown in FIG. 5, between the metal pipes 7. By providing the spacers 9 made of an insulating material and insulating them from each other, it is possible to eliminate the possibility of overheating due to overcurrent without forming one turn.

[Effect of device]

As described above, according to the present invention, (1) by using a good heat conductor for the cooling duct spacer, heat is conducted from the coil → the spacer for duct → the cooling medium in the duct, and the heat radiation effect of the cooling duct is improved. It is possible to improve.

(2) Further, heat conduction in the vertical direction of the cooling duct is also performed through the spacer, and the temperature difference in the vertical direction of the coil is reduced,
It is possible to equalize the rise in the internal temperature of the coil.

[Brief description of drawings]

FIG. 1 is a sectional view showing a conventional example of this type of coil and an embodiment of the present invention, and FIGS. 2 to 5 are partial sectional views showing other embodiments. 2 ... coil, 2a ... coil first part (inner part), 2b
... second part of coil (outer part), 3,9 ... spacer,
5 ... duct, 6,7,8 ... pipe.

Claims (1)

[Scope of utility model registration request] 1. A coil with a cooling passage in which a plurality of spacers are arranged between an outer portion and an inner portion of a coil and a cooling duct through which a cooling medium flows is provided between the spacers. It is made of a good conductor of heat and arranged so that a one-turn circuit is not formed in the circumferential direction, and it is electrically connected to the end of winding of the inner part of the coil or the start of winding of the outer part to fix the potential. Characteristic cooling passage coil.