JP3788842B2 - Wheel-integrated electric motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a wheel-integrated electric motor for a railway vehicle, and more particularly, to a wheel-integrated electric motor having a water cooling structure.
[0002]
[Prior art]
Japanese Unexamined Patent Publication No. 5-344680 discloses a conventional wheel-integrated electric motor that uses air to cool. The cooling mechanism disclosed here is configured such that air introduced into the electric motor through a hollow axle cools the stator core and the rotor fitted into the axle. Such an air cooling system has a problem in maintainability due to the accumulation of dust taken together with air. On the other hand, the conventional technology of the wheel-integrated electric motor for cooling with cooling water, Ru Tei disclosed in European Patent Application Publication 0623988 A1. Cooling mechanism of this is the cooling holes flowing to the axle for supporting the outer rotor rotatably the cooling water is provided, so as to cool the fitted interpolated stator directly on the axle.
[0003]
Furthermore, the cooling of this type of conventional wheel-integrated electric motor, will be described with reference to FIG. In FIG. 4, the basic configuration of the wheel-integrated electric motor has a cooling water passage 12 </ b> A inside, a cylinder 2 fitted on the outer periphery of an axle 1 that supports a vehicle body (not shown) in a non-rotating state, and the cylinder a wheel 3 which is rotatably supported via a bearing 5 which is fitted on the outer periphery of one end of the second axis direction and connected to the wheel 3, and is fitted in the axial direction of the other end of the barrel 2 a wheel-integrated electric machine rotor frame 4 and the permanent magnet or a cage type rotor 11 which is rotatably supported via a bearing 6 by rotationally driving the wheels 3, disposed close to the inside of 該回 trochanter 11 And a stator core 9 and a stator coil 8 as a stator fitted on the outer periphery of the cylinder 2 between the bearings 5 and 6 .
[0004]
And it has the cooling jacket 7 inserted by the inner side of the stator core 9, and was inserted by the outer peripheral part of the cylinder 2, and this cooling jacket 7 is connected to the cooling water channel 12A formed in the cylinder 2. A cooling water passage 12 is provided in the interior, and the stator core 9 fitted in the cooling jacket 7 is cooled by cooling water flowing through the cooling water passages 12 and 12A .
[0005]
The cooling structure of a conventional wheel-integrated electric machine using the cooling water as described above, the air taken in conjunction with the cooling water, and the gas generated due to be included in the cooling water temperature rises, the top of the cooling jacket 7 It is known that it accumulates on the upper wall portion of the cooling water channel 12 provided in the wall and becomes an obstacle to heat conduction. FIG. 5 shows an outline of the temperature distribution 14 of the stator core inserted in the cooling jacket 7. Due to the above heat transfer failure, the temperature of the upper part is high.
[0006]
The object of the present invention is to transfer heat that is taken together with cooling water and gas that is contained in the cooling water and that is generated as the temperature rises, and accumulates on the upper wall portion of the cooling water channel provided in the upper part of the cooling jacket. It is an object of the present invention to provide a wheel-integrated electric motor equipped with a highly reliable cooling jacket that can cope with the obstacles.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a rotor that is rotatably connected to the outer periphery of an axle, a cooling jacket that is fitted on the outer periphery of the axle and has a plurality of cooling water channels therein, and an outer periphery of the cooling jacket. A wheel that is fitted and inserted and faces the inner side of the rotor, a wheel that is integrally connected to the rotor, and a wheel that is provided with a cooling pipe that is hollow and is connected to the cooling water passage. In the integrated electric motor, a water reservoir is provided at both ends in the axial direction of the cooling jacket so as to face the opening of the cooling water channel, and the water inlets connected to the water reservoir are installed below the cooling water channel located at the lowermost part. The water outlet connected to the water reservoir was installed above the cooling water channel located at the top .
[0008]
And the cooling water channel provided in the cooling jacket was formed in a spiral shape. Moreover, when the cooling water channel of the cooling jacket is formed into a plurality of straight lines, the cross-sectional area of the cooling water channel located at the upper part of the cooling jacket is made larger than the cross-sectional area of the cooling water channel located at the lower part.
[0009]
With this configuration, the air taken in conjunction with the cooling water, and the gas generated due to be included in the cooling water temperature rises, the upper wall of the cooling channel provided in the uppermost portion of the cooling jacket Since it moves and is discharged together with the cooling water without being accumulated, it is possible to eliminate heat transfer obstruction caused by accumulated air or gas .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention is shown in FIG. FIG. 1 shows a plurality of cooling water channels 12 provided in the cooling jacket 7, and the cooling water channels 12 are formed in a spiral shape with respect to the cylindrical cooling jacket 7. If it does in this way, the temperature rise of a cooling water will become equal in each cooling water channel 12 , and the nonuniformity of the temperature distribution of the stator core 9 inserted by the cooling jacket 7 can be eliminated.
[0011]
FIG. 2 also shows a plurality of cooling water passages 12 provided in the cooling jacket 7. The cooling water passages 12 are formed in a straight line with respect to the cylindrical cooling jacket 7 , and the cooling water located at the uppermost part of the cooling jacket 7. increasing the cross-sectional area of the channel 12, in which formed small cross-sectional area of the cooling channel 12 located in the lower part.
[0012]
FIG. 3 shows a rotor rotatably connected to the outer periphery of the axle 1 as shown in FIG. 4 and a cooling jacket in which a plurality of cooling water channels 12 are provided in the outer periphery of the axle 1 through a cylinder 2. 7, a stator iron core 9 that is fitted on the outer periphery of the cooling jacket 7 and is located opposite to the inner side of the rotor, a wheel that is integrally connected to the rotor, and the axle 1. FIG. 4 is a partial detail view of a wheel-integrated electric motor having a cooling water channel 12A connected to a cooling water channel 12 of the cooling jacket 7. Then, the cooling axially opposed ends of the jacket 7 in the opening of the cooling channel 12 by sump 13A, the provided 13B, these water reservoir 13A, a water inlet 13a to be connected to one side of the water reservoir 13A of the 13B while installed under than the cooling water passage 12D located at the lowest portion of the cooling jacket 7, since the installed water outlet 13b to be connected to the water reservoir 13B to the upper of the cooling water passage 12 U located at the top of the cooling jacket 7 There is .
[0013]
With such a configuration , the flow path of the cooling water is formed from the lower part to the upper part. Therefore, the air taken into the cooling water supplied from the cooling water path 12A is moved into the cooling jacket 7 by the flow of the cooling water . The cooling water passage 12 is moved upward, and the water is easily moved to the water reservoir 13B by utilizing the property of moving upward, and discharged from the water outlet 13b to the cooling water passage 12A on the discharge side. Further, the gas generated with the included temperature rise in the cooling water is also in the same way, are discharged from the readily water outlet 13b by utilizing the property of moving to the flow and the upper cooling water to the cooling water passage 12A on the discharge side The Therefore, air and gas do not accumulate in the cooling water passage 12 in the cooling jacket 7, and uneven temperature distribution of the stator core 9 inserted into the cooling jacket 7 can be eliminated.
[0014]
【The invention's effect】
Above according to the described in the present invention as in detail, the air taken in conjunction with the cooling water, and the gas generated due to be included in the cooling water temperature rises, the cooling channel located at the top of the cooling jacket is exhausted by moving together without cooling water to collect in the upper wall portion, it is possible to obtain a high wheel-integrated electric motor without that impede heat transfer to the stator core reliability.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a cooling jacket structure of a wheel-integrated electric motor according to the present invention.
FIG. 2 is a perspective view showing an outline of a cooling jacket structure of a wheel-integrated electric motor according to another example of the present invention.
FIG. 3 is a cross-sectional view showing an outline of a cooling jacket structure of a wheel-integrated electric motor according to another example of the present invention.
FIG. 4 is a cross-sectional view showing an outline of a cooling jacket structure of a conventional wheel-integrated electric motor using cooling water.
FIG. 5 is an explanatory diagram illustrating an outline of a temperature distribution of a stator core of a conventional wheel-integrated electric motor using cooling water.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Axle, 2 ... Cylinder, 3 ... Wheel, 4 ... Rotor frame, 5, 6 ... Bearing, 7 ... Cooling jacket, 8 ... Stator coil, 9 ... Stator iron core, 10 ... Stator presser, 11 ... Permanent Magnet or cage rotor, 12 , 12A ... Cooling water channel, 12D ... Cooling water channel located at the bottom, 12U ... Cooling water channel located at the top, 13A , 13B ... Water reservoir, 13a ... Water inlet, 13b ... Out Mizuguchi, 14 ... Temperature distribution of the stator core.

Claims (1)

A rotor that is rotatably connected to the outer periphery of the axle, a cooling jacket that is inserted into the outer periphery of the axle and has a plurality of cooling water passages therein, and is inserted into the outer periphery of the cooling jacket and faces the inner side of the rotor. In the wheel-integrated electric motor, the cooling jacket includes: a stator that is positioned in a row; a wheel that is integrally connected to the rotor; and a cooling water passage that is provided near the axle and is connected to a cooling water passage of the cooling jacket. A water reservoir is provided at both ends in the axial direction opposite to the opening of the cooling water channel, and a water inlet connected to the water reservoir is installed below the cooling water channel located at the bottom and a water outlet connected to the water reservoir. Is a wheel-integrated electric motor that is installed above the cooling water channel located at the top .

Images