JPH088757B2 - Ventilation cooling structure of vehicle rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a ventilation cooling structure for a rotating electric machine for a vehicle, which is installed on a bogie as an induction motor type main motor of a railway vehicle.

(Prior Art) As a general structure of a ventilation cooling type rotary electric machine for a vehicle of this type, those shown in FIGS. 7 and 8 are known. FIG. 7 is a plan view of a ventilation cooling type rotary electric machine for a vehicle, and FIG.
The figure shows how the draft-cooled electric rotating machine for a vehicle is mounted on a railway vehicle.

That is, the mount 101 is extended from the vehicle body 100, and the mount 101 is
A ventilation air cooling type electric rotating machine for vehicle 102 is supported by 101.
The rotating shaft 103 of the ventilation cooling type rotary electric machine 102 for a vehicle has an axle 1 through a universal coupling 104, a small gear 105, and a large gear 106.
Rotation torque generated from the rotary shaft 103 is coupled to the 07 and is transmitted to the axle 107 to rotate the wheels 108 provided on the axle 107, thereby causing the vehicle body 100 to travel along the rail 109.

In the above-described ventilation-cooled electric rotating machine for a vehicle, it is easy to generate heat during operation and overheat, and if heated to a certain level or more, deterioration of the insulator is accelerated and life is shortened, or strength of the heating element is reduced. Therefore, in order to suppress the temperature rise in the rotating electric machine, it is necessary to introduce cooling air to cool the rotating electric machine. There are two types of cooling methods for rotating electrical machines: a self-ventilation type cooling method that automatically introduces cooling air into the motor by using the rotation of the rotor, and another force that guides the cooling air by an external blower device. There is a ventilation type cooling system.

Ventilation-cooled rotating electric machine for vehicle 10 shown in FIGS. 7 and 8.
Reference numeral 2 denotes a self-ventilation cooling type electric motor, and this vehicle ventilation cooling type rotary electric machine 102 is provided with a cooling air inlet 110 and an exhaust air outlet 111 (FIG. 9). A flexible wind passage 112 is attached.

The above-mentioned ventilation-cooled electric rotating machine for vehicle 102 must be arranged between the mounting base 101 and the axle 107 in the front-rear direction and between the vehicle body 100 and the rail 109 in the vertical direction.
In other words, the ventilation cooling type rotary electric machine 102 for vehicles and the mounting base 101
And a gap of size a between the air-cooling type rotating electric machine for vehicle 102
Between the vehicle-axle 107 and the axle 107, a dimension c between the air-cooled rotating electric machine for vehicle 102 and the rail 109, and a gap-cooled electric rotating machine for vehicle 102 between the vehicle body 100. The d dimension must be secured, and as a result, the vehicular draft-cooled rotary electric machine 102 has a space S surrounded by a chain line in FIG.
I try to fit it inside.

FIG. 9 (A) is a vertical cross-sectional view of the vehicle draft cooling type rotating electrical machine 102, FIG. 9 (B) is a graph showing the temperature inside the vehicle draft cooling type rotating electrical machine 102, and FIG. A) CC
A line sectional view is shown. A shaft 115 is rotatably supported by a bearing 114 on a frame 113 of the vehicle draft cooling type rotating electrical machine 102. A rotor 116 and a fan 117 are fixed to the shaft 115.

The rotor 116 is a basket-shaped rotor, and the rotor bar 1 is inserted into the slot of the laminated rotor core 118 fitted and fixed to the shaft 115.
19 is inserted, and ring-shaped short-circuit rings 129 are welded to both ends of the rotor bar 119. An air hole 121 is formed in the rotor iron core 118 along the shaft 115 so that the rotor 116 is cooled by the cooling air.

On the other hand, the stator 122 provided on the inner surface of the frame 113
Is configured by inserting a stator coil 124 into a slot formed in the laminated stator core 123 and connecting them.

Thus, in the above-mentioned ventilation cooling type rotary electric machine for vehicle 102, when the fan 117 rotates integrally with the shaft 115 by energization, cooling air is introduced into the inside of the rotating electric machine 102 through the inlet 110, and this cooling air is After passing through the air holes 121 formed in the stator iron core 123 and the rotor iron core 118, the air is discharged from the air exhaust port 111 to the outside, during which the rotor 116 and the stator 122 are cooled.

FIG. 11 is a sectional view similar to FIG. 10 of the vehicle DC motor. This vehicle DC motor has a main pole coil 127 and an auxiliary coil 128 fixed to the inner surface of a frame 126, and the main pole coil
A rotor 129 is arranged in the center of the 127 and the auxiliary 128, and a cooling structure similar to that of the ventilation cooling type rotary electric machine 102 is adopted.

However, since the DC motor has a gap between the coils 127 and 128 as is apparent from FIG. 11, the cooling effect is higher than that of the ventilation cooling type rotary electric machine 102. This is clear by comparing the solid line (temperature distribution of the ventilation cooling type rotary electric machine) and the dotted line (temperature distribution of the DC motor) in FIG. 9 (B), and this is the cooling of the ventilation cooling type rotary electric machine. Means that the structure is not sufficient.

For this reason, a draft cooling type rotary electric machine having a cooling structure as shown in FIG. 12 and a sectional view taken along the line DD in FIG. 12 has been proposed.

The above-mentioned ventilation cooling type rotating electric machine is provided with a stator 122 and a frame 113.
A plurality of gaps 130 are formed at equal intervals in the circumferential direction between and to increase the cooling cross section, but when applying a ventilation cooling type rotating electric machine having such a cooling structure to a vehicle, There are such disadvantages.

That is, as described with reference to FIGS. 7 and 8, the ventilation cooling type rotating electric machine 102 must be housed in a predetermined space S surrounded by the vehicle body 100, the mounting base 101, the axle 107 and the rail 109. Instead, if the gap 130 is formed between the stator 122 and the frame 113 over the entire area in the circumferential direction, the size of the entire main motor increases, and the space S cannot fit in the space S. Forming the gap 130 is effective in cooling the stator 122, but is almost ineffective in cooling the rotor 116.

[Problems to be solved by the invention]

Ventilation-cooled rotary electric machines for vehicles of the above type have higher output than that of shapes due to the problems of strength due to narrow installation space in the bogie, thinning of the frame and local heat due to the cooling structure inside the machine. However, there is a problem that it is not possible to meet the recent needs such as labor saving of maintenance due to reduction of algebra and improvement of vehicle performance.

The present invention has been made in view of the above points, can be installed within the constraints of a narrow installation space in the bogie, and while ensuring sufficient strength, the outer diameter of the stator core is increased,
Moreover, it is an object of the present invention to provide a ventilation cooling structure for a rotary electric machine for a vehicle, which is capable of improving the cooling structure in the machine to save the maintenance by reducing the number of vehicles and to improve the performance of the vehicle.

[Structure of Invention]

(Means for Solving the Problems) The ventilation cooling structure for a rotary electric machine for a vehicle according to the present invention has a structure in which the cooling air introduced from the cooling air inlet is exhausted through the rotary electric machine through the exhaust port. In order to guide a part of the cooling air introduced to the leeward side stator coil or rotor to the stator outer part of the rotating electric machine located in the spare space part other than the rotating electric machine installation part in the bogie in the ventilation cooling structure of A bypass passage is provided.

Further, the ventilation cooling structure for a rotary electric machine for a vehicle according to the present invention is characterized in that an adjusting plate for separating a required amount of cooling air and guiding the cooling air to the bypass passage is provided in the vicinity of the inlet of the bypass passage.

(Operation) In the ventilation cooling structure for the rotating electric machine for a vehicle of the present invention,
Part of the cooling air introduced into the rotary electric machine through the introduction port, through a bypass passage provided in the stator outer portion of the rotary electric machine located in the spare space portion other than the rotary electric machine installation portion in the carriage, By guiding to the stator coil or rotor on the leeward side, the high temperature part on the leeward side can be cooled while being installed within the constraints of the narrow installation space inside the bogie, local heat can be improved, and large output due to temperature averaging Becomes possible.

(Embodiment) An embodiment of a ventilation cooling structure for a rotary electric machine for a vehicle according to the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a vertical sectional view of a main electric motor to which a ventilation cooling structure according to the present invention is applied, and FIG. 2 is a sectional view taken along the line AA of FIG. Is rotatably supported, and a basket-shaped stator 4 and a fan 5 are attached to the shaft 3.

The rotor 4 has the rotor core 6 fitted and fixed to the shaft 3,
The rotor bar 7 is inserted into the slots of the rotor core 6, the ring-shaped short-circuit rings 8 are welded to both ends of the rotor bar 7, and the rotor core 6 is provided with cooling air holes 9 parallel to the shaft 3. Is configured. In addition, a stator is provided on the inner surface of the frame 1.
10 is fixed, and this stator 10 is composed of a laminated stator core 11 and a stator coil 12 inserted into a slot of the laminated stator core 11, and is cooled between the stator core 11 and the rotor core 6. A clearance 13 is formed.

On the other hand, an inlet 14 and an outlet 15 for cooling air are provided on the upper surface of the frame 1, and an upper space near one side of the frame 1, that is, an extra space portion other than the rotary electric machine installation portion in the bogie. A bypass passage 16 having a height that does not change the height of the electric motor is provided in the outer portion of the stator of the rotating electric machine. An adjusting plate 17 is attached to the inlet of the bypass passage 16, and a partition plate 18 is provided so as to hang down from the frame 1 which is leeward of the outlet of the bypass passage 16.

In the cooling structure configured as described above, when the fan 5 rotates integrally with the shaft 3 by energization, the air in the electric motor is exhausted from the exhaust port 15. Cooling air is introduced into the electric motor through the inlet 14 as shown by the white arrow. This cooling air is separated by the adjusting plate 17, and a part of the cooling air cools the stator coil 12, passes through the cooling gap 13 and the air hole 9, and cools the stator core 11 and the rotor core 6. After cooling the rotor bar 7 and the short-circuit ring 8, the fan 5 discharges the air from the air outlet 15.

On the other hand, the other part of the cooling air separated by the adjusting plate 17 is
It is guided to the leeward side stator coil 12 through the bypass passage 16, and a part of it cools the stator coil 12, then passes through the gap ring of the partition plate 18 and is discharged from the air exhaust port 15, and the other part is As shown in FIG. 2, the rotor bar 7 and the short-circuit ring 8 are cooled after passing through the stator coils 12 and then discharged.

As described above, according to this embodiment, the cold cooling air before flowing into the main electric motor is limited to the spare space portion other than the rotary electric machine installation portion inside the bogie outside the frame 1 of the main electric motor, that is, the main electric motor. By directly contacting the stator coil 12 on the leeward side, the rotor bar 7 on the leeward side, the short-circuit ring 8 and the like through the bypass passage 16 provided in the open space, the temperature gradient generated on the leeward side and the leeward side, and the central portion and the outer periphery. Since the temperature gradient generated in the part can be averaged, the deterioration of the coil insulation can be suppressed and the life can be extended, and the strength decrease of the heating element (rotor bar 7) can be suppressed and the life can be extended. Exert the effect of.

FIG. 3 is a sectional view showing another embodiment according to the present invention, and FIG. 4 is a view taken in the direction of arrow E in FIG. In this embodiment, a guide plate 19 bent on the windward side is provided in place of the partition plate 18 provided in the main motor shown in FIG.
Most of the cooling air from 16 is directed toward the rotor coil 12 to enhance the cooling efficiency.

Further, in the embodiment shown in FIG. 5, a gap 20 is provided between the bypass passage 16 and the frame 1 so that the cooling air passing through the inside of the bypass passage 16 does not absorb the heat of the frame 1 to prevent the cooling air from flowing. I try not to raise the temperature.

Further, in the embodiment shown in FIG. 6, the cooling air introduction port 14 is formed over the entire width of the frame 1, and the bypass passages 16 are also provided on the left and right sides in the width direction of the frame 1, respectively. The amount of cooling air passing through the bypass passage 16 is increased to enhance the cooling effect.

(Effects of the Invention) As described above, the ventilation cooling structure for the rotary electric machine for a vehicle according to the present invention is introduced to the stator outer side portion of the rotary electric machine located in the spare space portion other than the rotary electric machine installation portion in the bogie. By providing a bypass passage for guiding a part of the cooling air to the stator coil or rotor on the leeward side, it is possible to install it within the constraints of the narrow installation space inside the trolley, and while securing sufficient strength, As a result, the outer diameter of the stator iron core can be increased, and the cooling structure inside the machine can be improved to reduce the number of units, which leads to labor saving in maintenance and high performance of the vehicle.

[Brief description of drawings]

1 is a longitudinal sectional view of a main motor to which a cooling structure according to the present invention is applied, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS. 3 and 4 are other embodiments of the present invention. FIG. 5, FIG. 5 and FIG. 6 are cross-sectional views showing still another embodiment of the present invention, FIG. 7 is a plan view showing a ventilation cooling type rotary electric machine mounted on a vehicle, and FIG. Fig. 7 is a view in the direction of arrow B, Fig. 9 (A) is a vertical sectional view of a conventional draft cooling type rotary electric machine, and Fig. 9 (B) is a graph showing a temperature distribution of the draft cooling type rotary electric machine.
FIG. 10 is a sectional view taken along the line CC of FIG. 9 (A), FIG. 11 is a sectional view of a DC motor, FIG. 12 is a longitudinal sectional view of a conventional draft cooling type rotating electric machine, and FIG. It is the DD sectional view taken on the line of FIG. 1 ... Frame, 4 ... Rotor, 6 ... Rotor core, 7
...... Rotor bar, 8 ...... Short-circuit ring, 9 ...... Wind hole, 10 ...... Stator, 11 ...... Stator core, 12 ...... Stator coil, 13 ......
Cooling gap, 14 ... Cooling air inlet, 15 ... Cooling air exhaust, 16 ... Bypass passage, 17 ... Adjustment plate, 18 ... Partition plate, 19 ... Guide plate.

Claims (2)

[Claims] 1. A ventilating cooling structure for a vehicular rotary electric machine configured to discharge the cooling air introduced from a cooling air introduction port through the rotary electric machine through an exhaust port, and an extra space portion other than a rotary electric machine installation portion in a bogie. A ventilation passage for guiding a part of the introduced cooling air to the leeward side stator coil or the rotor on the outer side of the stator of the rotating electric machine located at Construction. 2. The vehicle rotation according to claim 1, further comprising an adjusting plate provided near an inlet portion of the bypass passage for separating a required amount of cooling air and guiding the cooling air to the bypass passage. Ventilation cooling structure for electric machines.