JP5201212B2 - Rotating machine cooling structure - Google Patents

Description

  The present invention relates to a cooling structure for a rotating machine, and more particularly to a cooling structure for a rotating machine that cools a coil end with high efficiency.

  Most of the heat generated in the rotating machine is due to the winding (coil) of the stator, and conventionally, air cooling, water cooling, oil cooling and the like are known as means for cooling such a rotating machine. In the case of air cooling, fins are provided on the motor frame of the rotating machine, and cooling is performed by blowing air with a fan or the like. In the case of water cooling, cooling water is circulated in the motor frame to circulate the cooling water for cooling.

  On the other hand, in the case of oil cooling in contrast to the above-described air cooling and water cooling, cooling is performed by using insulating oil as a refrigerant and spraying cooling oil directly on the coil. For example, cooling oil is supplied from the upper part of the motor to the coil end part in the casing, and the cooling oil that has dropped to the bottom part of the casing that has cooled the coil end part is recovered from the lower part of the motor. A circulation system is known in which the temperature of the cooling oil collected by an oil cooler or the like is lowered, and then sent again from the upper part of the motor to the coil end part. As means for cooling the rotating machine by oil cooling in this way, several proposals for spraying oil on the coil more effectively have been devised.

  For example, in the following Patent Document 1, a cooling oil groove for guiding cooling oil supplied from the outside is provided on the entire circumference or upper half in the circumferential direction of the coil end to cool the coil end. Are disclosed. In Patent Document 2 below, an oil passage groove is formed on the outer periphery and inner periphery of the coil end to increase the amount of contact oil and the contact area to the coil end, thereby improving the cooling performance and the heat transfer coefficient of the oil. A device designed to prevent the decrease is disclosed.

JP 2005-12961 A JP 2006-31750 A

  However, since the coil end is a bundle of thin wires, and each wire is insulated with enamel etc., a strong pressure is locally applied to the coil end, and the groove is formed by deforming the coil end. For example, there is a possibility that the enamel coating may be peeled off and the insulation of the coil may be incomplete, which may lead to a failure of the motor. In addition, there is a problem that the work becomes complicated when trying to shape the enamel coating so as not to peel off.

  Accordingly, an object of the present invention is to provide a cooling structure for a rotating machine that can cool a coil end with a simple configuration and high efficiency.

A cooling structure for a rotating machine according to a first aspect of the present invention for solving the above problems includes a cooling oil supply means for supplying cooling oil to an upper portion of a coil end, and cooling for discharging the cooling oil from below the coil end. In the cooling structure for a rotating machine provided with an oil discharging means , an outer peripheral part is fixed to an inner surface of the casing of the rotating machine, abutting against an axial end of the coil end, and a part of the cooling oil is transferred to the coil A cooling oil derivative that guides in a circumferential direction along a contact portion with the end is provided.

  A rotating machine cooling structure according to a second invention is characterized in that, in the rotating machine cooling structure according to the first invention, the cooling oil derivative is a plate formed in an annular shape.

  A rotating machine cooling structure according to a third invention is characterized in that, in the rotating machine cooling structure according to the second invention, the cooling oil derivative is made of a member having electrical insulation and heat resistance. To do.

  Further, according to the cooling structure for a rotating machine according to the fourth invention, in the cooling structure for the rotating machine according to the first invention, the coil end bundles a plurality of electric wires via an insulator. Features.

According to the cooling structure for a rotating machine according to the first aspect described above, the cooling oil supply means for supplying the cooling oil to the upper part of the coil end and the cooling oil discharge means for discharging the cooling oil from below the coil end are provided. In the cooling structure of the rotating machine, the outer peripheral part is fixed to the inner surface of the casing of the rotating machine, abutting against the axial end of the coil end, and a part of the cooling oil along the contact part with the coil end. Since the cooling oil derivative that guides in the circumferential direction is provided, the cooling oil supplied to the upper part of the coil end from the cooling oil supply means moves to the end side of the coil end according to gravity, and the coil end and the cooling oil derivative It is guided in the circumferential direction along the space to be formed, and then is discharged from the cooling oil discharge means from below the coil end, so that the cooling oil can be reliably brought into contact with the coil end. Reliably it can perform the coil end cooling at Do configuration.

  Further, according to the cooling structure for a rotating machine according to the second invention, since the cooling oil derivative is a plate formed in an annular shape, the coil end can be reliably attached to the axial end of the coil end with the minimum necessary area. It can be made to contact.

  Moreover, according to the cooling structure for a rotating machine according to the third aspect of the invention, the cooling oil derivative is made of a member having electrical insulation and heat resistance, so that the coil end can be cooled safely with the cooling oil. Can do.

  Further, according to the cooling structure for a rotating machine according to the fourth aspect of the invention, the coil end is a bundle of a plurality of electric wires via an insulator, so that a groove for cooling oil is formed in the coil end, etc. If this processing is not performed, there is no possibility that an insulator such as enamel coating for insulating each electric wire will be peeled off.

It is sectional drawing which shows the cooling structure of the rotary machine which concerns on the Example of this invention. It is sectional drawing seen from the AA arrow direction of FIG. It is explanatory drawing which shows the flow of the cooling oil in the rotary machine which concerns on the Example of this invention.

  Hereinafter, embodiments of a cooling structure for a rotating machine according to the present invention will be described in detail with reference to the drawings.

  1 is a cross-sectional view showing a cooling structure of a rotating machine according to the present embodiment, FIG. 2 is a cross-sectional view as seen from the direction of arrows AA in FIG. 1, and FIG. 3 is an explanatory view showing the flow of cooling oil at a coil end. is there.

  As shown in FIG. 1, a rotating machine to which the cooling structure according to the present embodiment is applied is fixed to a shaft 3 that is rotatably supported in a casing 1 via a bearing 2 and an outer peripheral portion of the shaft 3. The rotor 4 and the outer periphery of the rotor 4 are arranged so as to face each other through an air gap, and the stator 5 is fixed to the inner surface of the casing 1.

  The rotor 4 includes a rotor core 6 and a plurality of permanent magnets 7 embedded in the rotor core 6. The stator 5 includes a stator core 8 and a coil wound around the stator core 8. Both end portions in the axial direction of the coil protrude from the stator core 8 to form a coil end 9.

  The casing 1 is provided with cooling oil inlets 10 as cooling oil supply means for supplying cooling oil to the coil ends 9 at positions facing the upper coil ends 9, respectively. Cooling oil discharge ports 11 serving as cooling oil discharging means for discharging the cooling oil in the casing 1 are provided at positions facing the coil ends 9.

  Further, in the present embodiment, the casing 1 is provided with cooling oil guide plates 12 as two cooling oil derivatives. The cooling oil guide plate 12 is formed by annularly forming a plate made of a heat-resistant material that is an electrically insulating material (see FIG. 2), and each outer peripheral portion is fixed to the inner surface of the casing 1, A surface 12 a orthogonal to the axial direction of the shaft 3 is in contact with the axial end of the coil end 9. Note that the inner diameter of the cooling oil guide plate 12 is large enough to allow the end of the coil end 9 in the axial direction to contact the cooling oil guide plate 12.

  Here, as the material of the guide plate 12, for example, polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyimide (particularly heat-resistant / cold-resistant polyimide material), engineering plastics such as fluororesin is applied. be able to.

  Hereinafter, the operation of the cooling structure of the rotating machine according to the present embodiment will be described. In the rotating machine, the coil end 9 generates heat when it is driven and a current flows through the coil or when heat generated by the stator core 8 conducts heat to the coil end 9. In order to cool the coil end 9 that has generated heat in this way, cooling oil is supplied to the coil end 9 from the cooling oil inlet 10.

  The cooling oil supplied from the cooling oil inlet 10 to the upper part of the coil end 9 moves in the axial direction, the circumferential direction, and the like according to gravity as indicated by arrows in FIG. Here, in the conventional case, as indicated by a two-dot chain line in FIG. 3, the cooling oil supplied to the coil end 9 moves toward the axial end of the coil end 9 opposite to the stator core 8 side. The cooling oil that had fallen down vertically.

  On the other hand, in the present embodiment, the casing 1 is provided with the cooling oil guide plate 12 that contacts the axial end of the coil end 9, so that the coil end 9 out of the cooling oil supplied to the coil end 9 is configured. When the cooling oil that has moved toward the axial end portion on the opposite side of the stator core 8 moves to a position where the coil end 9 contacts the cooling oil guide plate 12, the cooling oil guide plate 12 causes the axial center of the cooling oil to move. While the movement to the side is restricted, along the contact portion between the coil end 9 and the cooling oil guide plate 12 (for example, A portion indicated by a broken line in FIG. 3), it follows the gravity and follows the circumferential direction as shown in FIG. To be guided to.

  Then, the cooling oil that contacts the coil end 9 and absorbs the heat of the coil end 9 falls to the bottom surface of the casing 1 and is discharged from the cooling oil discharge port 11 to the outside of the casing 1. The cooling oil discharged from the cooling oil discharge port 11 is cooled by an oil cooler or the like and then repeatedly supplied from the cooling oil injection port 10 to the coil end 9.

  As described above, according to the cooling structure for a rotating machine according to the present embodiment, the cooling oil guide plate 12 is provided in the casing 1 so as to be in contact with the axial end portion of the coil end 9. The cooling oil is guided along the contact portion (A part) between the cooling oil guide plate 12 and the cooling oil guide plate 12 to prevent the cooling oil from moving to the axial end of the coil end 9 and dropping downward as it is. it can. Therefore, the cooling oil can be reliably brought into contact with the coil end 9 and the cooling efficiency of the rotating machine can be improved.

  Further, the cooling oil guide plate 12 is used to reliably contact the cooling oil with the coil end 9 in the circumferential direction, so that the cooling oil is brought into contact with the coil end 9. Therefore, there is no possibility that the enamel coating for insulating each electric wire constituting the coil is peeled off, and the coil end 9 can be securely connected with a simple structure. Can be cooled.

  In addition, this invention is not limited to the Example mentioned above, For example, although the example which uses a cyclic | annular board as the cooling oil guide plate 12 was shown in the Example mentioned above, the cooling oil guide plate 12 is other than cyclic | annular. In addition, the material of the cooling oil guide plate 12 is not limited to that described above, and various modifications can be made without departing from the spirit of the present invention. Absent.

Claims (4)

In a cooling structure for a rotating machine comprising cooling oil supply means for supplying cooling oil to an upper part of a coil end, and cooling oil discharge means for discharging the cooling oil from below the coil end,
Cooling in which an outer peripheral portion is fixed to an inner surface of the casing of the rotating machine, abuts against an axial end portion of the coil end, and guides a part of the cooling oil in a circumferential direction along a contact portion with the coil end. A cooling structure for a rotating machine, characterized in that an oil derivative is provided.   The cooling structure for a rotating machine according to claim 1, wherein the cooling oil derivative is a plate formed in an annular shape.   The cooling structure for a rotating machine according to claim 2, wherein the cooling oil derivative is made of a member having electrical insulation and heat resistance.   The cooling structure for a rotating machine according to claim 1, wherein the coil end is a bundle of a plurality of electric wires via an insulator.

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