JPH09331649A - Totally enclosed main motor for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a totally enclosed main motor for vehicle which can increase a cooling effect and overload capacity. SOLUTION: A pair of openings 6c are formed in an upper part of a main frame 6A and closing valves 10 are installed for the openings 6c. The closing valves 10 are provided with valve plates 12 oscillatorily through pins 12a. On a lower face of an upper part of a ventilation frame 8 of each closing valve 10, an electromagnetic coil 10a and an iron core 10b are installed. A stator coil 1 is provided with a temperature detector 17. A signal of the temperature detector 17 is sent to an operation room. When the signal is beyond a preliminarily set value, the electromagnetic coils 10a of the closing valves 10 are excited to open the valve plates and then take in outside air into the inside of the main frame 6A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a vehicle full-closed traction motor with an internal fan.

[0002]

2. Description of the Related Art FIG. 4 is a half cross-sectional view showing an example of a conventional fully-closed traction motor for a vehicle, showing a case of a squirrel-cage induction motor with an inner fan. It should be noted that due to space limitations, the center part is divided into left and right parts.

In FIG. 4, the outer cylinder frame 6a, which is formed from a mild steel plate and has a substantially U-shaped cross section, is formed at the left end, which is the opening side, on the outer periphery of a disk-shaped side frame 6b in a left side view (not shown). After the fitting portion is mounted, it is fixed with a plurality of bolts, and the side frame 6b and the outer cylinder frame 6a constitute the main frame 6C.

The bearing plate 9 is provided at the center of the right end of the outer cylinder frame 6a.
Is pre-inserted from the inside and fixed from the inside with bolts. The ball bearing 5 is press-fitted into the inner circumference of the bearing plate 9 from the outside. Similarly, the roller bearing 4 is press-fitted from the outside into the central portion of the side frame 6b.

The roller bearing 5 and the ball bearing 4 are press-fitted into the rotary shaft 3 in advance. Of these, the left roller bearing 4 is a bearing retainer whose inside is fitted in the central portion of the side frame 6b.
The outer ring is fixed from the outside by 15A, and the ball bearing 5 on the right side is fixed by the bearing retainer 15B in which the left side is fitted to the inner circumference on the outside of the bearing plate 9.

A rotor core 13 is inserted into the rotary shaft 3,
The rotor iron core 13 is fixed by iron core retainers 13a inserted from both sides of the rotary shaft 3. Ventilation holes 13b are formed in the rotor core 13 in the axial direction at 45 ° intervals in a side view (not shown).

On the left side of the iron core retainer 13a on the left side, an inner fan 7 is press-fitted and fixed to the rotary shaft 3 from the left side. The slots (not shown) formed on the outer circumference of the rotor core 13
Each rotor bar 14 is inserted and these rotor bars
Both ends of 14 are connected by an annular end ring 14a. As a result, the rotor core 13, the rotor shaft 3, the rotor bar 14 and the like constitute a rotor of a squirrel cage induction motor.

A taper portion 3a is formed at the left end of the rotor shaft 3, and one side of a flexible joint (not shown) is press-fitted into the taper portion 3a. The other side of the flexible joint has a reduction gear (not shown). The machines are connected.

On the other hand, the stator core 2 is press-fitted into the center of the inner periphery of the outer cylinder frame 6a, and the stator coil 1 is inserted into the slot formed in the axial direction of the inner periphery of the stator core 2. The coil end portions 1 at both ends of the stator coils 1 inserted
a projects from both sides of the stator core 2.

In the fully-closed traction electric motor for a vehicle constructed as above, the inner fan 7 is also rotated by the rotation of the rotary shaft 3 when the train is running, and the inner cooling air is rotated by the inner fan 7. As shown by an arrow A1 in FIG. 4, the air flows from the vent 2a of the stator core 2 to the right side of the stator core 2 as shown by an arrow A2.

Then, the cooling air flows from the right side between the stator core 2 and the rotor 3 and the ventilation hole 13b of the rotor 3.
Through the arrow A2 to the left as shown by arrows A3 and A4, and is sucked into the inner fan 7 as shown by arrow A5. Hereinafter, the circulation is performed as indicated by arrows A1-A2-A3-A4-A5.

As described above, the stator core 2 and the stator coil 1, the rotor core 13 and the rotor bar 14 are cooled by the cooling air circulating inside the main frame, and the stator coil 1 is insulated with the insulating resin. The rotor bar 14 maintains the insulating characteristic between the stator core 2 and the rotor core 13 for a long period of time.

By the way, in such a fully-closed traction electric motor for a vehicle incorporated in a vehicle, it is required to reduce the price of the electric train by reducing the number of electric trains to be mounted per train. Therefore, it is required to increase the output per vehicle, to be downsized because it is installed in the limited space under the floor of the vehicle, and to reduce the weight in order to speed up the train. It is also required to extend the maintenance cycle to save labor.

When maintaining and inspecting the fully closed main traction motor for a vehicle, the bogie to which the fully closed main traction motor for a vehicle is attached is separated from the vehicle body, and then the bolt for fixing the fully closed main traction motor for the vehicle to the trolley is attached. Remove, lift up and remove.

Therefore, in order to reduce the frequency of maintenance / inspection involving the work of separating the dolly from the vehicle body, for example, in the main electric motor mounted on a train or a bullet train in an urban area,
It has been requested that the inspection cycle be from the conventional 2-3 years to 4-6 years or more.

For this reason, various fully-cooled main electric motors for vehicles have conventionally been adopted. Among them, an external blower type which introduces cooling air from a separately provided blower to the inside of the main electric motor for vehicle through a duct. In addition, the fully enclosed main motor with an internal fan shown in FIG. 4 is adopted.

Among the above, the former not only increases the price and occupies a large space due to the arrangement of the duct on the vehicle body, but also requires maintenance and inspection of the ventilation filter attached to the external blower type. However, in order to reduce the weight and reduce the frequency of maintenance and inspection, the latter inner fan is required.

[0018]

However, in the vehicular fully-closed traction motor configured as described above, the portion of the variable-voltage variable-frequency inverter power supply for supplying electric power to the vehicular fully-closed traction motor should be provided. In the event that some of the fully closed main motors (for example, 16) for a vehicle of one formation become inoperable due to a mechanical failure, etc., the remaining motors will be loaded, so cooling air will be introduced from the outside. The coil may overheat compared to the external blower type.

For this reason, a polyimide resin is used as the insulating resin with which the coil is impregnated to improve the heat resistance so that the insulation characteristics do not deteriorate even with a temporary temperature rise. However, recent electric motors that have been designed to increase their output with a small size may not be able to cope with the situation, especially during the summer rush hours. Therefore, it is an object of the present invention to provide a fully-closed traction electric motor for a vehicle, which can enhance the cooling effect and the overload capacity.

[0020]

According to a first aspect of the present invention, there is provided a fully-closed traction electric motor for a vehicle, comprising: a rotor provided through a shaft center of a main frame having a plurality of vent holes; A stator fixed to the inner circumference, an opening / closing valve provided at the ventilation port and opened / closed by excitation, a temperature detector provided inside the stator, and an output signal of this temperature detector are input and preset values are set. And a control unit for opening and closing the opening / closing valve when exceeding the limit.

The vehicle full-closed traction motor according to a second aspect of the invention is characterized in that the temperature detector is provided in the stator coil of the stator.

Further, the full-closed traction electric motor for a vehicle according to a third aspect of the invention is characterized in that the temperature detectors are provided on the bearings of the stator and the rotor.

The fully closed main electric motor for a vehicle according to a fourth aspect of the present invention is characterized in that the ventilation holes are formed on both axial sides of the tubular portion of the outer frame of the stator.

Further, the vehicle full-closed main electric motor according to a fifth aspect of the present invention is characterized in that the ventilation openings are formed on both axial sides and both side plates of the tubular portion of the outer frame of the stator.

By such means, in the invention according to claim 1, when the temperature inside the outer frame exceeds a preset value due to an increase in load, the controller opens and closes the on-off valve, External cooling air is introduced into the outer frame to cool it.

In the invention described in claim 2,
When the temperature of the stator coil exceeds a preset value, and when the temperature of the stator or the bearing exceeds a predetermined temperature in the invention according to claim 3, the control unit opens the open / close valve to allow outside air to flow inside. To cool.

Further, in the invention according to claim 4, when the temperature of the stator or the bearing exceeds the set temperature due to an increase in load, it is formed on both axial sides of the tubular portion of the stator or both sides and both side plates. Open the vent to open the outside air to the inside.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fully-closed traction motor for a vehicle according to the present invention will be described below with reference to the drawings. FIG.
1 is a vertical cross-sectional view showing a first embodiment of a fully-closed traction electric motor for a vehicle of the present invention, and is a view corresponding to FIG. 4 shown in the related art and corresponding to claims 1, 2 and 3. 1 is different from FIG. 4 in that a pair of open / close valves for taking in outside air is attached to the upper part of the main frame, and other parts are the same as in FIG. Therefore, the same parts as those in FIG.

That is, a pair of opening portions 6c which are rectangular in a plan view (not shown) are symmetrically formed on the upper portion of the outer cylinder portion 6a of the main frame 6A, and the outer surface side of the opening portion 6c is not shown. The seat is welded and the top surface is machined flat. A tubular ventilation frame 8 is fixed to these openings 6c with bolts 16 via a flange portion welded to the lower end.

These ventilation frames 8 are notched in a plan view (not shown) except for the central portion of the upper end and the four corners. Further, in the plan view (not shown), a square-shaped partition 10c is inserted into the inner periphery of the lower portion and welded to the inner surface of the ventilation frame.

The base end of the valve plate 12 is swingably supported on the partition 10c via a pin 12a inserted through a pair of bearings provided upright on one side of the partition 10c. The lower surface of the other end of 12 is in contact with the upper surface of the other side of the partition 10c.

On the other hand, on the lower surface of the upper part of the ventilation frame 8, an on-off valve
An electromagnetic coil 10a that constitutes 10 is fixed, an iron core 10b is inserted into the inner circumference of the electromagnetic coil 10a, and the upper end is fixed to the ventilation frame 8. Both ends of the electromagnetic coil 10a are connected to a main motor cooling circuit of a vehicle control device.

Furthermore, the upper end of a coil spring 11 having a small wire diameter and a large number of turns is locked on the lower surface of the upper part of the ventilation frame 8, and the lower end of this coil spring 11 is on the upper surface of the other end of the valve plate 12. It is locked. As a result, in FIG. 1, the valve plate 12 is pressed by the partition 10c by the restoring force of the coil spring 11, and the vertical vibration applied to the valve plate 12 by the traveling of the train causes the valve plate 12 to move.
Is not open.

Further, a thermocouple type temperature detector 17 is attached to the coil end portion 1a of the stator coil 1 inserted into the slot on the inner circumference of the stator core 2, and this temperature detector 17 is attached.
The 17 output signal lines are connected to the traction motor cooling circuit of the control device described above.

In the vehicle full-closed traction motor constructed as described above, in a steady state, as in the conventional vehicle full-closed traction motor shown in FIG. 4, the internal fan 7 is used to cool the inside by cooling air. To be done.

That is, when the train is running, the inner fan 7 is also rotated by the rotation of the rotary shaft 3, and the inner fan 7 is fixed from the vent hole 2a of the stator core 2 by the rotation of the inner fan 7 as shown by an arrow A1 in FIG. The cooling air that has flowed into the right side of the child core 2 as shown by the arrow A2 shows from the right side between the stator core 2 and the rotor 3 and the ventilation holes 13b of the rotor 3 from the arrow A2 to the arrows A3 and A4. Thus, it flows to the left side and is sucked into the inner door 7 as shown by an arrow A5. Hereinafter, arrows A1-A2-
Recirculate with A3-A4-A5.

On the other hand, in the unlikely event of a failure of the inverter power supply of this train, some of the fully-closed traction electric motors for vehicles in one formation become inoperable, and the load on the remaining electric motors increases, resulting in a fixed load. When the temperature of the stator coil 1 of the child core 2 exceeds a preset value, the electromagnetic coil 10a is excited by the signal input from the temperature detector 17 via the control device.

Then, the magnet plate 10b is used to form the valve plate.
12 is sucked and swings upward with the pin 12a as an axis to open the pair of open / close valves 10. As a result, the outside air that has flowed in the direction of the arrow B1 shown in the upper right of FIG. 1 flows into the inside through the opening 6c formed on the right side of the main frame 6A as shown by the arrow B2 shown by the broken line.

The outside air is the same as the arrows A3 and A4 showing the flow of the cooling air in the steady state, and the air gap formed between the stator core 2 and the rotor 3 and the ventilation formed in the rotor 3. mouth
13b flows as shown by arrows A3 and A4, and is also sucked into the inner door 7 as shown by arrow A5, and a part thereof is shown by arrow A3.
As shown in FIG. 1, the air flows into the ventilation port 2a of the stator core 2, and the others are discharged from the left opening 6c to the outside of the main frame 6A.

Therefore, in the vehicle full-closed traction motor configured as described above, even if some of the vehicle full-closed traction motors cannot operate at the time of peak load, they remain. Since it is possible to suppress the temperature rise inside the electric motor, it is possible to withstand overload for a short time, and it is possible to drive the vehicle to the next stop station or garage.

A wire mesh is provided on the outer periphery of the ventilation frame 8 to prevent dust and the like from being wound up from the track.
You may prevent the ingress of dust that is rolled up from the track. Further, in the cab, when the temperature of the temperature detector 17 exceeds a specified value, a signal light may be turned on to display that effect, and the train may be operated.

To this end, the temperature detected by the temperature detector 17 is detected in a plurality of stages to determine whether it is within a range in which the train operation can be continued, or whether the train can be operated to the next stop station, or The operator may be allowed to determine whether or not the vehicle can travel to the garage.

Next, FIG. 2 is a longitudinal sectional view showing a second embodiment of the vehicle full-closed main electric motor of the present invention, which corresponds to FIG. 1 and corresponds to claim 2. In FIG. 2, FIG.
The difference is that the mounting position of the temperature sensor is increased,
Since the temperature of the bearing is also detected, the others are the same as in FIG. Therefore, the same parts as those in FIG. 1 are designated by the same reference numerals.

That is, in the vehicle full-closed traction motor shown in FIG. 2, in addition to the coil end portion 1a of the stator coil 1 shown in FIG. A thermocouple type temperature detector 18 is attached.

In the vehicle full-closed type traction motor constructed as described above, when the temperature of the rotor shaft 3 rises due to the temperature rise of the stator core 2, the rotor bar 14 and the rotor core 13, this rise temperature is increased. By detecting with the detector 18,
The temperature rise due to the rotor, which cannot be detected in the first embodiment, can also be detected.

Therefore, not only the abnormal temperature rise on the rotor side can be detected, but also when the detected temperature exceeds a predetermined temperature, the opening / closing valve 10 is opened to cope with the internal temperature rise. be able to.

Next, FIG. 3 is a longitudinal sectional view showing a third embodiment of the vehicle full-closed type traction motor of the present invention.
FIG. 6 is a diagram corresponding to FIG. 1 shown in the embodiment of FIG. 1 and FIG. 2 shown in the embodiment of FIG. 2 and corresponding to claim 5. 3 is different from FIG. 2 shown in the second embodiment in that an open valve is added to both axial side surfaces of the stator frame, and is otherwise the same as FIG.

That is, in the vehicle full-closed traction electric motor shown in FIG. 3, the ventilation frame 10 is fixed to each of the axially right and left central portions of the main frame 6B, and the inside of the ventilation frame 10 is fixed. Also, the electromagnetic coil 10a and the iron core 10 shown in FIGS.
b, a partition 10c, a compression coil spring 11, a valve plate 12 and the like are stored.

Thus, not only the upper surface of the main frame 6B,
In a fully-closed traction motor for a vehicle in which an opening valve is also incorporated in the side plates in the axial direction, the temperature of the stator core 2, the rotor bar 14, and the rotor core 13 rises, so that the temperature of the rotor shaft 3 rises. When the detected temperature exceeds a predetermined temperature, the opening / closing valve 10 on the side surface in the axial direction is also opened, so that the internal temperature rise can be dealt with, so that the cooling effect can be further increased and the overload capacity can be reduced. It can be raised further.

[0050]

As described above, according to the first aspect of the present invention,
A rotor penetrating the shaft center of the main frame in which a plurality of vent holes are formed, a stator fixed to the inner circumference of the outer frame, an on-off valve provided in the ventilation port and opened and closed by excitation, and a stator By providing a temperature detector provided inside of the outer frame and a control unit that opens the opening / closing valve when the output signal of the temperature detector exceeds a preset value, the inside of the outer frame increases as the load increases. If the temperature exceeds the preset value, the control unit that judges this will open the on-off valve and guide the external cooling air into the inside of the outer frame to cool it, thus increasing the cooling effect and overload capacity. It is possible to obtain a fully-closed traction electric motor for a vehicle, which can be increased.

According to the second aspect of the present invention, by providing the temperature detector on the stator coil of the stator, the control for judging the temperature of the stator coil when the temperature exceeds a preset value. Since the on-off valve is opened by the section to guide the external cooling air to the inside of the outer frame for cooling, it is possible to obtain a fully-closed traction electric motor for a vehicle capable of enhancing the cooling effect and increasing the overload capacity. .

According to the third aspect of the present invention, by providing the temperature detector on the bearings of the stator and the rotor, it is determined when the temperature of the stator or the bearing exceeds a predetermined temperature. Since the control part opened the on-off valve to guide the outside air to the inside and cooled, the control part opened the on-off valve,
Since the external cooling air is guided to the inside of the outer frame to be cooled, it is possible to obtain a fully-closed traction electric motor for a vehicle which can enhance the cooling effect and the overload capacity.

Further, according to the invention described in claim 4, the ventilation ports are formed on both sides in the axial direction of the cylindrical portion of the outer frame of the stator. Further, according to the invention described in claim 5, By forming the ventilation holes on both axial sides and both side plates of the cylindrical part of the outer frame of the stator, the controller that determines if the temperature of the stator or bearing exceeds the set temperature due to an increase in load A fully closed type for vehicles that can improve the cooling effect and the overload capacity by opening the ventilation holes formed on both sides in the axial direction of the cylindrical part of the stator or on both sides and both side plates to guide the outside air to the inside. The main motor can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a fully closed main motor for a vehicle according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a second embodiment of a fully-closed traction electric motor for a vehicle according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a third embodiment of a fully-closed traction electric motor for a vehicle of the present invention.

FIG. 4 is a vertical sectional view showing an example of a conventional fully-closed traction motor for a vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator coil, 2 ... Stator core, 2a, 13b ... Vent hole, 3 ... Rotating shaft, 4 ... Roller bearing, 5 ... Ball bearing, 6A ... Main frame, 6a ... Outer cylinder frame, 6b ... Side frame, 6e ... Opening part, 7 ... Inner fan, 8 ... Ventilation frame, 9 ... Bearing plate, 10 ... Open / close valve, 10a ... Electromagnetic coil, 10b ... Iron core, 10c ... Partition, 11 ... Coil spring,
12 ... Valve plate, 12a ... Pin, 13 ... Rotor core, 14 ... Rotor bar, 15A, 15B ... Bearing retainer, 16 ... Bolt, 17, 18 ... Temperature detector.

Claims (5)

[Claims] 1. A rotor penetrating the shaft center of a main frame having a plurality of ventilation holes, a stator fixed to the inner circumference of the outer frame, and an opening / closing by excitation provided in the ventilation port. For an on-off valve, a temperature detector provided inside the stator, and a control unit for opening the on-off valve when an output signal of the temperature detector exceeds a preset value. Fully closed main motor. 2. The fully-closed traction motor for a vehicle according to claim 1, wherein the temperature detector is provided in a stator coil of the stator. 3. The full-closed traction electric motor for a vehicle according to claim 1, wherein the temperature detector is provided on bearings of the stator and the rotor. 4. The fully closed main electric motor for a vehicle according to claim 1, wherein the ventilation holes are formed on both axial sides of a cylindrical portion of an outer frame of the stator. . 5. The vehicular whole according to claim 1, wherein the ventilation holes are formed on both sides and both axial sides of a tubular portion of an outer frame of the stator. Closed type traction motor.