JPS6331446A - Electrical rotating machine for vehicle - Google Patents

Abstract

PURPOSE:To enable cleaning and removing dust and the like stuck to and accumulated on a short-circuit ring and a coil end without disassembling a motor by letting compressed air blow out to an end face side of rotor and stator through a blowout hole. CONSTITUTION:A blank plug 21 of end connection 20 formed on an outer periphery of frame 1 and compressed air is sent into said end connection 20 via a hose 22. Said compressed air flows into a ventilation flue 16 and further blows out into a space portion on an end face side of rotor 2 and stator 7 via respective blowout holes 17a, 17b. Compressed air blowing out from the blowout hole 17a blows mainly against a short-circuit ring 12 of rotor 2 and that jetting from the blowout hole 17b, mainly against a coil end 9a of stator 7, by which dust and the like stuck to and accumulated on the short-circuit ring 12 and the coil end 9a are separated and removed by cleaning of said ring and coil end.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating electric machine for a vehicle such as a main motor installed in a bogie of a railway vehicle, and in particular to an AC type squirrel cage induction motor. This article relates to a rotating electric machine for a vehicle that is adopted.

(Prior Art) Generally, a rotating electrical machine for a vehicle (hereinafter simply referred to as a motor) installed as a main electric motor 1 on a bogie of a railway vehicle is in an adverse environment where it is covered with dirt, rainwater, dust, etc. On the other hand, with this type of motor, in order to suppress heat generation during operation, it is necessary to take outside air into the motor for ventilation cooling, so normally an air filter is installed at the outside air intake and the air is taken into the motor for cooling. Ventilation cooling is performed while removing the aforementioned dust and other substances from the outside air. However, the installation environment of the motor is poor, and the filter attached to the outside air intake of the motor has a size restriction in order to fit into the limited space inside the truck, so it is taken in as cooling air. If the removal of dust, etc. in the outside air is not sufficient, a certain amount of dust, etc. will inevitably be introduced into the motor along with the outside air, and if the motor is used for a long period of time, this dust, etc. will adhere to various parts inside the motor. accumulate. If this condition is left as it is, the heat dissipation from the surface of the heat generating part will deteriorate, the cooling efficiency will drop, and the temperature will rise abnormally.
Problems arise that can lead to loss of life.

Recently, direct motors have been used as motors for vehicle traction motors, etc. For example, instead of M machine
As seen in No. 56, alternating current machines, especially squirrel cage induction motors, are beginning to be used.

As shown in FIG. 7, this type of squirrel cage induction motor has a ventilation fan 4 attached to a rotating shaft 3 fitted to a rotor 2 inside a frame 1. This is a self-ventilation cooling type upper unit that rotates integrally to ventilate the air.A filter 6 is attached to the outside air intake port 5 opened at the end of the frame 1 on the side opposite to the ventilation fan, and when the ventilation fan 4 rotates during operation, outside air is is filtered by the filter 6 and sucked into the interior through the outside air intake 5 as cooling air,
From here, the air passes through the gap G between the stator 7 provided on the inner circumferential surface of the frame 1 and the rotor 2 to the ventilation fan 4 side, and is exhausted to the outside from the exhaust port 8, and is then discharged from the inside of the motor. ventilation cooling is performed.

Here, coil ends 9a of the stator coil 9 are provided on both ends of the stator 7, and short circuit rings 12 are provided on both ends of the rotor 2.
are arranged respectively, and the above-mentioned cold FA air flows into the gap G through the circumference of these coil ends 9a and the short circuit ring 12. As the cooling air circulates in this manner, dust and the like that have entered the cooling air are deposited on various parts of the coil end 9a and the short circuit ring 12 facing the side where the outside air intake 5 is arranged. If the coil end 9a and the short circuit ring 12 are used for a long period of time, the heat dissipation from each surface of the coil end 9a and the short circuit ring 12 will deteriorate, resulting in a decrease in ventilation cooling efficiency, resulting in abnormal temperature rise, and the insulation life of the stator coil 9 will be shortened due to the temperature rise. This may lead to accidents such as deterioration of performance or burnout. Further, in the rotor 2, the rotational balance of the rotor 2 is lost due to the difference in the amount of dust and the like deposited on each part of the short-circuit ring 12, causing vibrations to occur.

For this reason, when the above-mentioned alternating current machine, especially a squirrel-cage induction motor, is used as a rotating electric machine for a vehicle, it is necessary to periodically clean and remove the accumulated dust and the like by blowing with compressed air. Note that for the gap G through which the cooling air directly flows, the wind speed (, lit
Due to the strong pressure (pressure), almost no accumulation of dust or the like occurs.

By the way, the reason why these alternating current machines, especially cage-filter conductive machines, have come to be used as rotating electric fences for vehicles is that they eliminate the need for commutators, brushes, and brush holders, which were indispensable with conventional direct current machines. The main reason for this is that there is no longer a need for covers for those inspections, and the cost can be reduced and quality can be improved by saving labor for maintenance and reducing the number of parts. Only the bearings 13 at both ends that support the rotating shaft 3 require maintenance. It has become possible to use the bearing 13 without disassembly for about 6 to 8 years due to improvements in the bearing lubrication structure and intermediate lubrication of lubricant without disassembly. During cleaning, as mentioned above, there is a limit to the size of the filter 6 attached to the outside air intake 5, and as a result, it was not possible to prevent the intrusion of dust, etc., and the bearing 13 was left unused for a long period of 6 years until it was time for disassembly and maintenance. If this is done, the amount of dust, etc. that adheres and accumulates on the coil end 9a of the stator 7 and the short circuit ring 12 of the rotor 2 will increase, resulting in a reduction in the insulation life of the stator coil 9, burnout, or damage as described above. Since this causes the problem of movement of the rotor 2, it is necessary to periodically clean it within a short period of time.

(Problem to be Solved by the Invention) When cleaning the inside of the motor, if the motor is removed from the truck and disassembled, the rotor's short-circuit ring and the stator's coil end can be cleaned using a blow nozzle, etc. It is possible to clean the motor, but in a short period of time the motor will have to be disassembled just for the purpose of cleaning, and the labor-saving benefits of using a separate AC system will be lost. There is a problem with putting it away. However, since this type of motor has a structure with a small opening as shown in Figure 7, the motor can be used not only when it is attached to the cart, but also when the motor is detached from the cart.
It is difficult to clean the short-circuit ring of the rotor and the coil ends of the stator without disassembling it.

The present invention has been made with attention to these points, and its purpose is to easily remove dust, etc. that has accumulated on the short circuit ring of the rotor and the coil ends of the stator, without disassembling the motor. The purpose is to clean and remove and enable extended maintenance regressions.

[Structure of the invention]

(Means for Solving the Problems) In order to solve these problems, the present invention provides a frame that covers the rotor and stator in an AC rotating electric machine for rolling stock that is installed on a bogie of a railway vehicle. A ventilation passage is provided, and in this ventilation passage, blow holes are formed opposite to the end face of the rotor and the end face of the stator, respectively, and the ventilation passage is connected to air supply from an external compressed air supply machine during cleaning work. It is designed to communicate with a connection port that receives a supply of compressed air.

(Function) When cleaning the inside of the motor, if you connect a hose from a compressed air supply device such as a separately prepared external compressor to the connection port and send compressed air into the ventilation path, this compressed air will rotate through each blowout hole. Dust, etc., which has spouted out onto the end faces of the child and stator, and has adhered and accumulated on the short-circuit rings and coil ends, is peeled off and cleaned.

(Example) Examples of the present invention will be described below. In each embodiment, parts that are the same as those in FIG. 7 are given the same reference numerals in the drawings, and redundant explanation thereof will be omitted.

A first embodiment is shown in FIGS. 1 and 2, and a partition plate 15 is attached to the inner side of the frame 1 that covers the rotor 2 and the stator 7 at the end face portion on the side where the outside air intake port 5 is arranged. A continuous annular ventilation passage 16 along the circumferential direction of the rotating shaft 3 is formed between the partition plate 15 and the inner end surface of the frame 1 . The partition plate 15 has a plurality of first ejection holes 17a1 facing the end face of the rotor 2 and the stator 7.
A plurality of second ejection holes 17b facing the end face of are formed uniformly. Further, a connection port 20 is formed on the peripheral surface of the frame 1, and this connection port 2o is connected to the ventilation path 1.
It is connected to 5. This connection port 20 is kept closed by screwing a blind plug 21 to prevent foreign matter from entering from the outside during normal times, but the blind plug 21 is removed when cleaning the inside of the motor. The end of a hose 22 from a compressed air supply device (not shown) such as a compressor prepared separately outside can be connected to receive the supply of compressed air.

Therefore, when cleaning the inside of the motor, the blind plug 21 of the connection port 20 formed on the circumferential surface of the frame 1 is scooped out and the connection port A hose 22 from a compressed air supply device such as a compressor prepared separately outside is connected to the hose 20 to feed compressed air. This compressed air flows into the ventilation passage 16,
Furthermore, the air is ejected from this ventilation passage 16 into the space on the end face side of the rotor 2 and stator 7 through the 11'3 and second ejection holes 17a and 17b. The compressed air ejected from the first ejection hole 17a mainly hits the short circuit ring 12 of the rotor 2, and the compressed air ejected from the second ejection hole 17b mainly hits the coil end 9a of the stator 7. As a result, dust and the like that have adhered and accumulated on the short-circuit ring 12 and the coil end 9a are peeled off and cleaned and removed. Note that if the peeled dust or the like falls and remains inside the motor, the dust or the like can be blown off and discharged to the outside from the exhaust port 8 by separately feeding compressed air from the outside air intake port 5.

Then, after completing the cleaning work inside the motor, remove the hose 22 from the connection port 20 and replace it with the blind plug 22.
Close it by screwing it on.

The vehicle is now ready for normal operation.

FIGS. 3 and 4 show a second embodiment, in which the first jet holes 17a are shaped like nozzles that protrude toward the short-circuit ring 12, and the second jet holes 17b are shaped like nozzles that protrude toward the coil end 9a. In such a case, compressed air can be blown onto the short-circuit ring 12 and the coil end 9a more effectively to clean the short-circuit ring 12 and the coil end 9a more effectively. can.

FIGS. 5 and 6 show a third embodiment, in which partition plates 15a and 15b are individually attached to the inside of the frame 1 to provide separate narrow ventilation passages 16a.

16b, a plurality of ejection holes 17a facing the short-circuit ring 12 are uniformly formed in one ventilation path 16a, and a plurality of ejection holes 17b facing the coil end 9a are formed uniformly in the other ventilation path 16b, and Both the ventilation passages 16a and 16b are connected to a common connection port 20 formed on the peripheral surface of the frame 1. In such a case, each ventilation passage 16
a.

Since the width of the hose 16b is narrow, there is an advantage that the compressed air supplied from the hose 22 can be effectively ejected from each of the ejection holes 16a and 16b without loss.

〔Effect of the invention〕

As explained above, according to the present invention, compressed air is jetted into the space on the end face side of the rotor and stator through the jet holes of the ventilation passage provided in the frame without disassembling the motor, and the short-circuited ring and coils are It is possible to easily clean and remove dust deposited on the end, thereby reliably extending the time required for disassembly and maintenance of the motor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first example 7Ji of the present invention. FIG. 2 is a sectional view taken along the line n-I in FIG. 1, FIG. 3 is a sectional view also showing the second embodiment, and FIG.
- A sectional view taken along the line IV, FIG. 5 is a sectional view also showing the third embodiment, and FIG. 6 is a sectional view taken along the line ■-■ in FIG.
FIG. 7 is a sectional view showing a conventional example. 2... Rotor, 3... Rotating shaft, 16.16a. 16b...Ventilation passage, 17a, 17b...Blowout hole, 20...Connection port. Applicant's agent: Takehiko Suzue, patent attorney. Figure 1 et al. 7b Figure 2' Figure 3 Figure 4

Claims (1)

[Claims] In an AC rotating electrical machine for a vehicle installed on a bogie of a railway vehicle, a ventilation passage is provided in a frame that covers a rotor and a stator, and the ventilation passage faces an end face of the rotor and an end face of the stator. 1. A rotating electric machine for a vehicle, characterized in that the ventilation passage is connected to a connection port that receives compressed air from an external compressed air supply device during cleaning work.