JPS585413Y2 - liquid cooled rotating electric machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to liquid cooling of the rotor core and stator winding ends of a rotating electric machine.

Conventionally, in order to cool the rotor core with cooling liquid,
Coolant was supplied to the axial cooling holes in the iron core through cooling holes in the shaft (hereinafter referred to as axial holes) and radial cooling holes in the iron core that communicated with these cooling holes.

However, this method has disadvantages in that it takes a long time to process the shaft hole and the longitudinal cooling hole, and that it requires a shaft with a large diameter and a special liquid supply device.

The present invention aims to eliminate the above-mentioned drawbacks and to uniformly cool the rotor core and stator winding ends by a simple method.

Therefore, according to the present invention, in a device that supplies cooling liquid from a liquid injection nozzle to one end side of a rotor core, a rotor core having an axial cooling hole opening through short-circuit rings at both ends of the core, A liquid supply member that is attached to and rotates as one unit and has a ladle-shaped recess with no partition around the entire circumference thereof and a passage leading from the bottom of the recess to the other short-circuit ring opening of the axial cooling hole; The injection angles are different along the circumferential direction at the peripheral end of the liquid supply member and the short-circuit ring on the side where the liquid supply member is not provided, and the injection angles are set uniformly in the axial direction of both stator winding ends. A liquid-cooled rotating electrical machine characterized by comprising a pair of injection parts that uniformly cools an iron part by supplying a cooling liquid is constituted.

According to the cooling with the configuration of the present invention, compared to the conventional method, there is no shaft hole and longitudinal cooling hole, there is no need for a thick shaft and a special liquid supply device, and the rotor core and stator winding can be connected with a simpler configuration. Since the ends can be cooled, it is possible to reduce the manufacturing cost and size of the rotating electric machine, and to improve efficiency by reducing mechanical loss.

Further, according to the configuration of the present invention, the short-circuit ring on both ends allows the coolant to pass through, and one end of the short-circuit ring is in contact with the liquid supply member, and the other end is in contact with the coolant through the injection part provided around the entire circumference of the short-circuit ring. The short-circuit ring and the iron core are further cooled through this contact.

Since the ladle-shaped recess of the liquid supply material has no partition around the entire periphery, the cooling liquid flows continuously and equally to all the axial cooling holes.

The injection part is provided around the entire periphery of the liquid supply member and the short circuit ring on the other end side, and can inject the cooling liquid from the entire periphery.

Since the injection direction of the injection part is inclined outward in the axial direction of the rotor, there is no possibility that droplets will enter the gap between the stator and rotor core and cause extra mechanical loss.

Since the injection angle in the longitudinal direction is changed along the circumferential direction of the injection part, the cooling liquid is uniformly diffused in the axial direction of the winding ends, which improves and uniformly cools the stator winding ends. Erosion of the winding ends due to concentration of cooling liquid can be prevented.

Therefore, according to the present invention, the cooling is improved, the short circuit ring is also cooled, the cooling effect is significantly improved, the size is reduced, and there is no corrosion of the stator winding ends, so the reliability is high. The effect of providing a liquid-cooled rotating electric machine can be obtained.

In addition, according to this proposal, the stator winding ends are not buried in the cooling liquid, and the stator winding ends are cooled by liquid injection cooling and evaporation of the liquid poured into the stator winding ends. Double cooling is achieved with cooling by absorption of vaporization heat, resulting in an extremely good cooling effect, which allows the electric machine to be made smaller.

Next, the present invention will be explained in more detail with reference to the drawings.

Conventionally, as in the embodiment shown in FIG. 1, a shaft hole 3 is provided in the rotor shaft 2 and a radial cooling hole 5 is provided in the rotor core 4 in order to send cooling liquid to the axial cooling hole 1 in the core that requires cooling. required.

The cooling according to the present invention does not require the shaft hole 3 and the radial cooling hole 5, so the manufacturing cost is reduced due to the shortening of machining time and miniaturization.

FIG. 2 shows an embodiment of the invention.

Axial cooling holes 7 provided around the entire periphery of the rotor core 6 are parallel to the rotor shaft 8 and are connected to the bottom of the ladle-shaped recess 12 of the ring-shaped liquid supply member 11 and the other injection part through short-circuit rings 9 and 10 at both ends. It communicates with 14.

The ring-shaped liquid supply member 11 is attached to one end of the rotor 6,
It rotates as one with this.

The pair of injection parts, one injection part 13 and the other injection part 14, are provided over the entire periphery of the peripheral end of the liquid supply member 11 and the other short circuit ring 10.

A part of the cooling liquid is supplied to one injection part 13, and the other part is injected from the liquid injection nozzle 15 toward the recess 12 and is held in the recess 12 by centrifugal force without leaking outside.
It flows through the short circuit ring 9, the axial cooling hole 7, and the short circuit ring 10 on the other side, and cools the stator core 6 and the short circuit rings 9 and 10.

The four parts 12 are V-shaped and increase the pressure at the bottom leading to the axial cooling holes 7, and since there is no radial partition, the cooling liquid is equally and continuously supplied to all the axial cooling holes 7 around the entire core. , significantly enhances the cooling effect.

One injection part 13 receives the cooling liquid from a liquid injection nozzle 16 separate from the recess 12, and optimizes its pressure and flow rate.

Both injection portions 13.14 have injection directions directed outward in the axial direction of the rotor and scatter cooling water toward both stator winding ends 18.19, so that stator core 17 and rotor core 6 Do not allow coolant droplets to enter the gap between the

Since the injection angles of both injection parts 13, 14 are varied along the circumferential direction, the cooling liquid is displaced in the axial direction and diffused,
Cooling of the stator winding ends 18, 19 is made uniform in the axial direction, improving cooling efficiency, and the injection liquid does not concentrate on a part of the winding end and corrode it.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotor of a conventional liquid-cooled rotating electrical machine, and Fig. 2 is a sectional view of a rotating electrical machine showing an embodiment of the present invention. , 8 is the rotor shaft, 9
, 10 is a short circuit ring, 11 is a liquid supply member, 12 is a ladle-shaped recess,
13.14 is an injection part, 15.16 is a liquid injection nozzle, 1
7 is a stator core, and 18 and 19 are stator winding ends.

Claims (1)

[Scope of utility model registration request] In a device that supplies cooling liquid from a liquid injection nozzle to one end of the rotor core, the rotor core has an axial cooling hole that opens through short-circuit rings on both sides of the core, and is attached to one end of the core and rotates as a unit. A liquid supply member having a ladle-shaped recess without a partition around the entire circumference thereof, and a passage leading from the bottom of the recess to the other short-circuit ring opening of the axial cooling hole, and the periphery of this liquid supply member. The end portion and the short-circuit ring on the side without the liquid supply member are provided with different injection angles along the circumferential direction, respectively, to uniformly supply the cooling liquid in the axial direction of both stator winding ends. A liquid-cooled rotating electrical machine characterized by comprising a pair of injection parts that uniformly cool the parts.