JPS642019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating motor using a magnetic iron core, such as a DC machine, which includes a stator made of a magnetic iron core that is magnetized by energizing an internal field coil, and a rotor. It's about machines.

Conventionally, this type of rotating machine is shown in Figures 1 and 2.
The one shown in the figure was known. In Figure 1,
1 is an annular stator made of a magnetic iron core, 4 is a rotor disposed inside the stator 1, 5 is a shaft, 6 is a rotor bar, and 2 surrounds the outside of the stator 1 and rotor 4. Frame, 7 is stator 1
A gap between the outer peripheral surface of the stator 1 and the opposing frame 2 portion, 8 a coil end space, 9 a large number of slots formed along the rotational direction on the inner peripheral surface of the stator 1 as shown in FIG. is a field coil installed in each slot 9, and 10 is a gap between the inner periphery of each slot 9 and the field coil 3.

Since the conventional rotating machine using a magnetic iron core is constructed as described above, heat dissipation when heat is generated by energizing the field coil 3 is caused by the large heat conduction resistance of the gaps 7 and 10. This caused problems in removing heat from the rotating machine. In order to solve this problem, the gaps 7 and 10 are filled with an insulating varnish or the like having a relatively low heat conduction resistance to dissipate heat. Usually, the stator 1 is impregnated in a varnish tank or the insulating varnish is applied by flow coating, and after the insulating varnish is applied to the entire gap 7 between the stator 1 and the frame 2, the insulating varnish is applied in a heated dryer. A method of solidification was used.

However, in order to prevent fluid insulating varnish, etc. from leaking out until it is heated and dried and solidified, it is necessary to hold the insulating varnish, etc. in the gaps 7 and 10 until solidification is completed. ,
As a means for this, a seal is applied to prevent leakage of insulating varnish between the outer peripheral surface of the stator 1 and the inner surface of the frame 2 in the gap 7, and a seal is applied to the opening of the slot 9 in the gap 10. Similarly, it is necessary to apply a seal to prevent leakage, and there is a disadvantage that attaching and removing such a seal requires a great deal of effort and complicated steps.

Furthermore, in the gap 7, even if a leak-preventing seal is applied, the leak-preventing effect is low, so it is necessary to fill the entire coil end space 8 with insulating varnish, etc. The rotation of the coil end space 8 has a disadvantage in that it obstructs the ventilation when cooling the coil end space 8 through ventilation.

This invention was made to eliminate the drawbacks of the conventional products as described above, and by devising the insulating filler, it is possible to create a leak-proof seal until the insulating filler solidifies. It is an object of the present invention to provide a rotating machine using a magnetic core that can reliably fill the above-mentioned gap without the need for magnetic cores and exhibit excellent effects on heat dissipation performance and ventilation cooling performance.

An embodiment of the present invention will be described below with reference to the drawings.

3 and 4, 1 is a stator made of a magnetic iron core, 2 is a frame, 3 is a field coil,
9 is a slot, which is the same as the conventional example shown in FIGS. 1 and 2, and the rotor 4, shaft 5, rotor bar 6, and coil end space 8 are not shown, but they are also the same as the conventional example. are the same.
Reference numeral 11 denotes an insulating filler filled in the gap 7 between the outer peripheral surface of the stator 1 and the opposing frame 2, and as shown in FIG. Gap 1 between the circumference and the field coil 3
0 is also filled with the above-mentioned insulating filler 11.

The insulating filler 11 is made by mixing fine magnetic powder of ferrite, which is an insulating and ferromagnetic material, in an insulating and thermosetting solvent. Then, while the field coil 3 is energized, the gaps 7 and 10 are filled with an insulating filler 11 by impregnation, coating, etc. as in the conventional example.

In this way, the magnetic attraction force distributed around the magnetic core, that is, the stator 1, causes the insulating filler 11 mixed with magnetic powder to be drawn into the gap 10 between the slot 9 and the field coil 3, and between the stator 1 and the frame. It is possible to prevent the insulating filler 11 from dripping and leaking until the insulating filler 11 solidifies.

Then, the insulating filler 11 is filled in the gaps 7 and 10.
While being attracted and held by the field coil 3, it is hardened and solidified by the heat generated by the energization of the field coil 3, thereby completing the prescribed filling.

As described above, according to the present invention, there is no need to apply a particularly complicated seal to prevent leakage, and the insulating filler filled in the gap around the magnetic core can be solidified, resulting in excellent heat dissipation performance. This has the effect that filling work with an insulating filler to obtain a rotary machine can be carried out very easily and efficiently.

Additionally, the dielectric strength is high because the insulating filler penetrates into the finer details of the gaps. Furthermore, since the coil end space does not need to be filled, good ventilation performance of the coil end space can be maintained, and a rotating machine with high durability as a whole can be provided.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing a conventional rotating machine using a magnetic core, Fig. 2 is a partially cutaway longitudinal sectional front view of Fig. 1, and Fig. 3 is a partially cutaway side view showing a rotating machine using a conventional magnetic core. FIG. 4 is a partially cutaway longitudinal sectional side view showing an embodiment of the present invention. 1... Stator (magnetic core), 2... Frame,
3... Field coil, 7, 10... Gap, 11...
Insulating filler. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 A ring-shaped stator consisting of a magnetic core that is magnetized by energizing the field coils, each of which has a field coil installed in a number of slots formed along the rotational direction on the inner peripheral surface, and this stator. In a rotating machine using a magnetic core, which includes a rotor disposed on the inside, and a frame provided so as to surround the rotor and the stator, the frame faces the outer peripheral surface of the stator. The gap between the frame part and the gap between the inner periphery of each of the slots and the field coil is filled with an insulating filling made by mixing magnetic powder in a thermosetting solvent that has insulating properties. A rotating machine that uses a magnetic iron core, which is characterized by being filled with a solidified agent.