JPH0214310Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a liquid-cooled rotating electric machine in which cooling liquid can be directly sprayed onto heat generating parts to achieve good cooling.

FIG. 1 shows a specific example of a brushless synchronous generator as this type of liquid-cooled rotating electric machine. In the figure, a frame 1 and brackets 2 and 3 on both sides constitute the outer cover of the generator, and a main armature 4 is inserted into the inner peripheral surface of the frame 1 to form a stator section.

On the other hand, a main field 8 facing the main armature 4 is fitted into a shaft 7 whose both ends are supported via bearings 5 and 6 attached to the brackets 2 and 3, respectively, forming a rotor section. are doing.

Further, in the stator section, an exciter field 9 is mounted on the bracket 2 on the side of the main armature 4, and in the rotor section, an exciter armature 10 and a rectifier 11 are arranged opposite to the exciter field 9. The exciter armature 10 and the main field 8 are electrically connected via the rectifying device 11 to form a brushless synchronous generator.

This generator is attached to the driving device (not shown) by the mounting flange 1a of the frame 1, and is driven and rotated via the spline 7a of the shaft 7, and is connected to the exciter field 9 from the outside. By receiving excitation, the main armature 4 can generate an output.

Next, to explain the cooling configuration, oil is generally used as the cooling fluid. First, this oil is supplied at an appropriate pressure from the oil supply port 12 provided in the bracket 2, and the oil is supplied to the hollow hole of the shaft 7 from one end inlet 7b to the other. It passes through to the end outlet 7c and is returned to the drive device side of the generator. A plurality of nozzles 13 are buried in this shaft 7, corresponding to the main field 8 and both coil end portions of the main armature 4, and the oil passing through the hollow hole is directed to the nozzles by rotational centrifugal force. 13 directly onto both ends of the coils, cooling the coils and at the same time turning the inside of the generator into an oil mist, which acts to cool the entire generator including the exciter coils.

The oil that has taken heat from the coils and the like accumulates at the bottom of the frame 1 and is discharged from the oil drain port 14. Further, the bearings 5 and 6 are also lubricated by the oil supplied from the oil filler port 12 flowing through the labyrinth portion 7d of the shaft 7 and through the small hole 7e at the left end of the shaft in the figure. ing.

According to the above configuration, it is intended to remove heat and achieve good cooling by spraying oil directly onto heat generating parts such as coils, but during the operation process, the oil naturally forms a mist. Therefore, it also enters the gap between the main armature 4 and the main field 8.

However, this gap is usually narrow, about several millimeters, and relatively long in the axial direction, so the main field 8
This gap is depressurized by the relative rotational movement between the main armature 4 and the main armature 4, and the oil is attracted to the axial center of the gap and does not flow. The oil that has entered also accumulates in the axial center of the space due to centrifugal force and does not flow. Therefore, the infiltrated oil not only does not provide a cooling effect, but also generates heat due to friction. Therefore, even if an attempt is made to suppress heat generation by spraying oil directly onto the ends of both coils, the cooling effect will be impaired due to the heat generation effect generated in the voids, resulting in the disadvantage that the temperature of the generator will increase. It was hot.

The present invention has been developed in view of the above points, and an object of the present invention is to provide a liquid-cooled rotating electric machine that can achieve good cooling by improving the fluidity of oil that has entered the gap.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 2, 4 is a main armature, and an armature coil 4b is wound within a slot of an armature core 4a.

On the other hand, 8 is the main field, and the field magnetic pole 8a on its circumferential surface
A field coil 8b is wound around each of the field coils 8b, and a V-shaped holder 8c extending in the axial direction is inserted into the slot between the field coils 8b. A plate-shaped wedge 8d extending in the axial direction is covered, and this wedge 8d forms a triangular space 8e in the holder 8c that communicates with the inside of the generator at the same pressure in the axial direction, and at the same time The magnetic coil 8b is pressed and fixed to the field magnetic pole 8a.

On the other hand, the cooling oil performs a cooling effect by removing the heat generated by the field coil 8b and the armature coil 4b by being sprayed directly onto the ends of the respective coils, but if the cooling oil enters the voids, As mentioned above, the movement is restricted and heat is generated due to friction, which has the opposite effect.

However, as shown in FIG. 2, a small hole 8f is bored in the center of the wedge 8d.
Cooling oil flows out from the space 8e into the gap via f. That is, the cooling oil in the space 8e is pushed out from the small hole 8f into the vacuumed gap by centrifugal force, and flows out into the generator from both axial ends of the gap together with the oil accumulated in the gap. In other words, the oil flows back through the circulation path that flows in from both ends of the space 8e in the axial direction and flows out to both ends of the gap in the axial direction through the small holes 8f.

In other words, the oil sprayed from the nozzle 13 fills the inside of the generator in the form of an oil mist, and then enters the space 8e and the void, but the main field 8
Due to the centrifugal force caused by the rotation of the oil in the space 8e, the pressure is reduced through the small hole 8f, and the oil rapidly flows out into the gap, and together with the oil accumulated in the gap, it flows out and diffuses into the generator from both ends of the gap. However,
Since the oil that has entered the gap and accumulated in the center is forced to flow, it is possible to prevent heat generation in the gap and improve the cooling function of the generator. And this is
One small hole 8f with a diameter of 2 mm is drilled in the center of each wedge 8d. Rated output 40KVA, rated rotation speed.
This was confirmed by actual measurement using a 6000rpm high-frequency generator, where the temperature at the frame surface, which was previously 81℃, decreased to 72℃ under the same conditions.

The wedge 8d is usually made of aluminum alloy or copper alloy, and one or more small holes 8f can be formed within a range that does not impair mechanical strength against the centrifugal force that the wedge 8d receives, and its shape can also be changed. A desired slit or the like can be formed.

As described above, according to the present invention, it is possible to provide a liquid-cooled rotating electrical machine that can suppress heat generation of a generator with an extremely simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the general structure of a liquid-cooled rotating electric machine, and FIG. 2 is a cross-sectional view showing essential parts of the liquid-cooled rotating electric machine according to an embodiment of the present invention. 4...Main armature, 8...Main field, 8a...Magnetic pole, 8b...Field coil, 8c...Holder, 8d
...Wedge, 8f...Small hole. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A nozzle is provided on the hollow shaft of the rotor that faces the stator with a gap in between, and the cooling liquid supplied from this nozzle to the hollow shaft is sprayed onto heat-generating parts such as coils of the stator and rotor to cool them. In a cold rotating electric machine, a holder extending in the axial direction and having a V-shaped cross section for press-holding a coil wound around the magnetic poles is disposed in a slot between the magnetic poles of the rotor, and a holder extending in the axial direction and having a V-shaped cross section is disposed in the slot between the magnetic poles of the rotor. It covers an extending wedge, and is characterized in that a small hole is bored in the center of the wedge to communicate between the cavity and a space in the holder formed by penetrating the wedge in the axial direction. liquid-cooled rotating electric machine.