JP2010187489A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of exhibiting high cooling performance. <P>SOLUTION: The rotary electric machine 10 includes a rotor 13 equipped on the outer surface of a rotating shaft 12, a stator 14 disposed oppositely with a predetermined spacing to the outer surface of the rotor 13 and having a coil wound around the core, and a supply tube 15 for supplying a cooling oil 1 to an coil end 14a. In the rotary electric machine, a flange 14b protruding to the dimension direction outside of the rotating shaft 12 is provided on the end of the coil end 14a, and the supply tube 15 supplies the cooling oil 1 to the core side rather than the flange 14b of the coil end 14a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine such as a motor or a generator, and particularly can greatly improve cooling efficiency.

  A rotating electric machine such as a motor or a generator supports a rotating shaft provided with a rotor having magnetic force on an outer peripheral surface so as to be rotatable inside the frame, and attaches a stator with a coil wound around a core to the inner surface of the frame, for example, In the case of a motor, a rotational force can be obtained by passing an electric current through the stator coil and rotating the rotor to rotate the rotating shaft. In the case of a generator, the rotor is rotated by rotating the rotating shaft. By rotating the, the current can be taken out from the coil of the stator.

  In such a rotating electrical machine, the stator is cooled because current flows through the coil of the stator, and the stator generates heat and the operation efficiency such as power generation efficiency and rotation efficiency is reduced.

  For this reason, for example, in Patent Documents 1 and 2 below, a supply pipe that supplies cooling oil to the coil end of the coil of the stator by supplying the cooling oil is provided inside the frame, and a groove that guides the circulation of the cooling oil. Is formed on the surface of the coil end of the stator coil, and the cooling oil supplied from the nozzle is circulated along the groove in the coil end of the stator coil so that the stator can be efficiently cooled with the cooling oil. A rotating electrical machine is proposed.

JP 2005-012961 A JP 2006-31750 A

  However, in the conventional rotating electrical machines described in Patent Documents 1 and 2 and the like as described above, the stator is cooled by circulating cooling oil in a groove formed in the coil end of the stator coil. Therefore, the surface area required for heat exchange between the cooling oil and the stator becomes relatively small, and further improvement in cooling efficiency is demanded.

  In view of the above, an object of the present invention is to provide a rotating electrical machine that can exhibit a high cooling capacity.

  A rotating electrical machine according to a first aspect of the present invention for solving the above-described problem is provided with a rotor provided on the outer surface of the rotating shaft and facing the outer surface of the rotor with a predetermined interval. In a rotating electrical machine comprising a stator with a coil wound around a core and a coolant supply means for supplying coolant to the coil end of the coil, a radial direction of the rotating shaft is provided at the end of the coil end. A flange portion protruding outward is provided, and the cooling liquid feeding means feeds the cooling liquid to the core side of the flange portion of the coil end.

  A rotating electrical machine according to a second invention is characterized in that, in the first invention, the flange is provided at the coil end over the entire circumferential length of the rotating shaft.

  A rotating electrical machine according to a third invention is characterized in that, in the first or second invention, the coolant feeding means feeds the coolant from above the coil end. To do.

  According to the rotating electrical machine of the present invention, the coolant can be brought into contact with most of the outer peripheral surface without leaking to the outside of the coil end. Therefore, the surface area required for heat exchange between the coolant and the stator is larger than before. Since the cooling efficiency is improved as compared with the prior art, a high cooling capacity can be exhibited.

It is an axial sectional view showing a schematic structure of a first embodiment of a rotating electrical machine according to the present invention.

  Embodiments of a rotating electrical machine according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to only the embodiments described below with reference to the drawings.

[Main embodiments]
A main embodiment of a rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 1 is an axial sectional view showing a schematic structure of a rotating electrical machine.

  As shown in FIG. 1, a rotary shaft 12 in a horizontal axial direction is rotatably supported via a bearing 12a inside a sealed frame 11 that is cylindrical in the horizontal axial direction. The shaft 12 penetrates the frame 11 so that at least one end side protrudes to the outside of the frame 11. A rotor 13 having a magnetic force is attached to the outer peripheral surface of the rotary shaft 12 inside the frame 11.

  Bolts (not shown) are arranged on the inner peripheral surface of the frame 11 so that a stator 14 in which a coil made of a copper wire is wound around a core made of a cylindrical iron core faces the outer surface of the rotor 13 with a predetermined distance. ) Is attached through. At the ends of the coil ends 14a (the axially outer side of the rotating shaft 12) respectively positioned on both ends in the axial direction of the rotating shaft 12 of the stator 14, the rotating shaft 12 is located more than the inner side of the rotating shaft 12 in the axial direction. The flanges 14b projecting radially outward are provided over the entire circumferential length of the rotating shaft 12 (the entire circumference in the rotational direction).

  A supply pipe 15 is attached to the upper end of the frame 11 near the both ends in the axial direction. The supply pipes 15 have their tips directed to the core side (in the axial direction of the rotary shaft 12) from the flange 14b of the coil end 14a. ing. Discharge pipes 16 that connect the inside and the outside of the frame 11 are respectively attached to both ends of the lowermost axial direction of the frame 11.

  The base end side of the supply pipe 15 is connected to a cooling oil feed outlet of a cooling oil temperature adjusting / feeding machine (not shown) that feeds the cooling oil 1 as a cooling liquid to a predetermined temperature. . The base end side of the discharge pipe 16 is connected to the cooling oil receiving port of the cooling oil temperature control feeder.

  In the present embodiment, the supply pipe 15, the discharge pipe 16, the cooling oil temperature adjusting / feeding machine, etc. constitute a coolant supply means.

  Next, the operation of the rotating electrical machine 10 according to this embodiment will be described.

  When used as a motor, when a current is passed through the coil of the stator 14, the rotor 13 rotates and the rotating shaft 12 rotates, so that a rotational force can be obtained. On the other hand, when used as a generator, when a rotational force is applied to the rotating shaft 12, the rotor 13 rotates, whereby a current flows through the coil of the stator 14, and the current can be taken out.

  And when operating the rotating electrical machine 10 in this way, if the cooling oil temperature adjusting and feeding machine is operated and the cooling oil 1 is supplied to the supply pipe 15, the cooling supplied to the supply pipe 15 The oil 1 is fed to the core side (inner side in the axial direction of the rotary shaft 12) from the flange portion 14b of the coil end 14a, and the outer peripheral surface of the coil end 14a in the axial direction of the rotary shaft 12 is supplied. The coil end 14a is in contact with the entire length of the coil end 14a while being guided by the flange 14b so that the coil end 14a does not leak outward in the axial direction of the rotating shaft 12. By flowing down, the stator 14 is cooled by exchanging heat with the almost entire length of the outer peripheral surface of the coil end 14a in the axial direction of the rotary shaft 12.

  The cooling oil 1 flowing down the coil end 14a was collected from the inside of the frame 11 via the discharge pipe 16 to the cooling oil temperature adjusting machine, and the temperature was adjusted by the cooling oil temperature adjusting machine. It is recycled by being fed again through the supply pipe 15 later.

  That is, in the rotating electrical machine 10 according to the present embodiment, the flange portion 14b is provided only at the end portion of the coil end 14a (the axially outer side of the rotating shaft 12).

  For this reason, in the rotating electrical machine 10 according to the present embodiment, the cooling oil 1 does not leak to the outside in the axial direction of the rotating shaft 12 over almost the entire length of the outer peripheral surface of the coil end 14 a in the axial direction of the rotating shaft 12. Since they can be brought into contact with each other, the surface area required for heat exchange between the cooling oil 1 and the stator 14 can be made larger than before, and the cooling efficiency can be improved as compared with the conventional case.

  Therefore, according to the rotary electric machine 10 which concerns on this embodiment, a high cooling capability can be expressed.

  The rotating electrical machine according to the present invention can be used extremely effectively in various industries such as motors and generators, because the cooling efficiency can be improved more than before and high cooling capacity can be exhibited.

DESCRIPTION OF SYMBOLS 1 Cooling oil 10 Rotating electric machine 11 Frame 12 Rotating shaft 12a Bearing 13 Rotor 14 Stator 14a Coil end 14b Hook 15 Supply pipe 16 Discharge pipe

Claims (3)

A rotor provided on the outer surface of the rotating shaft;
A stator that is disposed so as to face the outer surface of the rotor with a predetermined interval and has a coil wound around a core;
In a rotating electrical machine comprising: a coolant supply means for supplying coolant to the coil end of the coil;
At the end of the coil end is provided with a flange projecting radially outward of the rotating shaft,
The rotating electrical machine characterized in that the cooling liquid supply means supplies the cooling liquid to the core side rather than the flange portion of the coil end. In the rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the flange is provided at the coil end over the entire circumferential length of the rotating shaft. In the rotating electrical machine according to claim 1 or 2,
The rotating electrical machine, wherein the cooling liquid supply means supplies the cooling liquid from above the coil end.

Images