JPS63209445A - Induction motor for vehicle - Google Patents

Abstract

PURPOSE:To make the dimension from the center line of a motor to a rail surface shortest, by utilizing the front, rear, upper and lower corner sections of a stator core and by arranging structural members necessary for composing the motor as a suspension driving device. CONSTITUTION:On an axle 8, a suspension metal fittings supported by a bearing is set, and on the right side, a motor nose 4A is set via a nose bearing rubber 6 confronted with a truck center sill 7. The surface T is confronted with a rail surface 29. The upper, lower, left, and right corner sections of a stator core 1 are set to be sections which can be composed regardless of a bogie the axle 8, the rail surface 29, and the lower section of the floor of a car body, at all, and so at the corner sections, connecting metal fittings 2-5 are arranged. On the connecting metal fittings 2, 3, fitting surfaces 2A, 3A for fitting the suspension metal fittings are formed.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a three-phase induction motor for driving a railway vehicle.

(Prior Art) Conventionally, DC series-wound motors have been widely used as drive motors for railway vehicles because they are suitable for the control characteristics of the vehicle. However, due to the fact that it has a structure such as brushes and commiata that requires time and effort to maintain the vehicle, recently, three-phase induction motors that are controlled by variable voltage variable frequency (hereinafter referred to as VVVF) devices using semiconductor technology have been developed. Recruitment is underway.

The body of the DC series-wound motor is made up of a strong magnetic frame, which serves as a magnetic flux path between the poles of each field coil and is a strong member that can withstand the large impact under the vehicle's springs. .

However, when this becomes a three-phase induction motor, the magnetic circuit is already constructed from laminated iron plates on the stator side, so the reason why the magnet frame itself must be constructed from thick steel plates is lost.
43 and Japanese Patent Laid-Open No. 61-16440, there is a three-phase induction drive electric motor in which a part of the body of the magnet frame is removed to make it lighter.

(Problems to be Solved by the Invention) -The problems to be solved by the present invention are those of JP-A-61-58443 and JP-A-6
1-16440, it is generally difficult to construct a three-phase induction motor with a large capacity in proportion to the size of the motor. This is an attempt to create an electric motor that makes effective use of space.

[Structure of the invention]

(Means for Solving the Problems) The three-phase induction drive motor according to the present invention is mainly intended for use in a fishing rod type drive device. The most severe problems for a large-capacity electric motor include contact with the axle, effective clearance on the rail surface, securing space above the floor, and contact with the center beam of the bogie frame. ,
Although strict dimensional restrictions are imposed from front to back,
There is no particular restriction on the space between the upper and lower beveled parts, so the electric motor may occupy it. Therefore, it is safe to use the motor until its cross section becomes square. Utilizing the space of this upper and lower oblique part, the structural members necessary for configuring the electric motor as a hook drive device are arranged here, and the structural members and the fJIiil of the drive shaft end of the electric motor and the opposite drive shaft end are arranged here. The combination U of the structure and the end plate structure is configured to hold the center of the stator laminated core and transmit the motor drive reaction force to the hook nose and the axle hook bearing.

(Function) When configured as above, the dimensions from the center of the electric motor to the center of the axle, the dimension to the rail surface, the dimension to the middle beam of the bogie, and the dimension to the bottom of the car body in the longitudinal and vertical directions are kept to a minimum. In accordance with the external dimensions of the stator core, the structure of the electric motor is constructed using space in the front, top, and bottom corners with sufficient dimensional space, and the stator core of a three-phase induction motor is tightened with the necessary tightening force to function as an electric motor. By satisfying the necessary structural conditions, an optimal structure can be obtained, especially for large hook-type electric motors.

(Example) Configuration of Example In FIG. 1, reference numeral 1 denotes a stator core of an induction motor, and a current from a VVVF device is passed through a 1A stator winding to form a rotating magnetic field. Since this electric motor is configured as a hook drive type, a suspension metal fitting supported by a bearing (not shown) is arranged on the axle 8 on the left side of FIG. A motor nose 4A is disposed via 6. The lower surface of the motor faces the 29 rail surface. Here, the top and bottom of the stator core 1 and the left and right corners in the figure are parts that can be configured completely independently of the bogie, axle, rail surface, and under the floor of the vehicle above. .5 connection fittings are arranged. In this case, the connecting fittings 2 and 3 are provided with mounting surfaces 2A and 3A for attaching suspension fittings, and can be accurately fixed in position with bolts 11 using wedges 10. The connecting fittings 3 and 5 are provided with 38.5A feet so that the electric motor is stable when placed alone on the floor. In addition, in this embodiment, a stator fixing member 1B is disposed at the portion of the stator core 1 that comes into contact with each of the connecting fittings, and a drive reaction force for driving the rotor is provided for correct positioning with respect to the connecting fittings 2, 3, 4.5. The action of the stator iron on the stator core is received by the connecting fittings. Although the rotor is not shown in FIG. 1 in order to facilitate the explanation of the drawing, FIG. 2 shows a typical cross section in the vertical direction, for example, and will be explained.

In this cross section, the outer periphery of the stator core No. 1 is directly exposed to the surface of the motor, and a core presser 30 is arranged at the axial end to compress it in the axial direction with only the field core assembled. The field winding 1A is held down using a non-standard jig and assembled, and the field winding 1A is fixed to a coil holder 15 disposed on an iron core holder 30 to ensure vibration resistance of the field winding 1A.

End fittings 12 and 13 are disposed on the same surface in terms of outer diameter in the axial direction with respect to the field core 1 and the core holder 30, and a mirror plate 14 is disposed on the end fitting 13 side. The rotor core 17 and the rotor shaft 16 are configured to be able to be pulled out to the end plate 14 side. The rotor shaft 16 is supported by a bearing 18 on the end plate 14 side and a bearing 19 on the end fitting 12 side, and a rotation detector 20 is arranged at the shaft end on the bearing 19 side.
It is necessary to field hack the exact rotor rotation speed to the VVVF device. The rotor shaft 16 on the end plate 14 side protrudes through the end plate 16 so as to be able to support a pinion that meshes with a gear on the axle side.

A JJI kite opening 21 is arranged on the mirror plate 14, so that cooling air from an air blower arranged on the vehicle body side can be discharged.

Next, we will explain the partial cross section where the connecting fittings 2.3 and 4.5 are attached using Fig. 3.The stator core rotor @ structure is the same as explained in Fig. 2, but the end fitting '12i3 A mating surface 24A is provided in the outer circumferential direction relative to the connecting fitting 2, respectively.

24 B iJ'aQG pulled combination pol l-25
A, 258"C connection fittings 2 are assembled. These combination surfaces 24△, 24B may be either flat or circumferential surfaces, but depending on the shape of the end fitting 12.13, it is preferable to form them by cylindrical circumferential machining, but if there is a protrusion on the outer periphery, flat machining is required. Consists of. The end fittings 12 and 13 are provided with flanges 27A and 27B, and the axial end faces of the connecting fitting 2 constitute axial mating surfaces 22Δ and 22B, ensuring dimensional accuracy in the axial direction of the motor by means of axial bolts 23A and 23B. At the same time, it has the effect of holding down the stator core 1 and the core presser 30 in the axial direction.

Fig. 4 is a perspective view of the electric motor structure shown in Figs.
This shows that A is protruding and that the air outlet 26 for introducing cooling air is arranged in a position that avoids the connecting fittings 2 and 4.

FIG. 5 shows the view from the opposite side of FIG. 4. On this side, there is a mounting surface 2A for assembling the suspension bearing that hangs the electric motor on the axle 8 and the suspension fittings 9 that hold it. , 3A indicates that the electric motor (Iku no indicates that it is arranged across the vehicle) and at the same time, the part of the suspension fitting 9 that houses the bearings is more similar to the part that covers the axle than the part that covers the axle. Since the diameter is large, a portion of the end fittings 12, 13 is recessed as a housing recess, as shown at 28A and 28B, within the range permitted by the internal structure of the field winding, etc.

Many structures other than those explained above are incorporated, but their explanations are omitted as they have little relevance to the present invention, but it goes without saying that they are incorporated in the same way as other three-phase induction machines.・
(:)do not have.

31. Effects of the Embodiment The effects of the embodiment shown in Figures 1 to 5 are as follows: in the direction of the middle shelf, in the direction of the rail surface in the direction of the center beam of the bogie, and in the direction of the underfloor of the vehicle, which are the most difficult dimensions for a vehicle drive motor. Since it is configured to the minimum dimensions that theoretically cannot be used for dimensions smaller than this, it is extremely suitable for cases where a high output motor must be incorporated into a small restricted dimension, such as a drive motor for a locomotive. It becomes possible to incorporate it as a structure. Next, since the electric motor itself is constructed by disassembling the stator side into thin parts, the proportion of machining using a large machine tool is reduced, making machining easier, which can be a feature of automotive equipment.

Next, considering the cooling of the electric motor, since the outer periphery of the stator core is directly exposed to the surface of the electric motor, the inside is cooled by a blower, and the outer surface is cooled by the vehicle running wind, so cooling is extremely good. It is possible to maintain the conditions.

Another major feature of the present invention is that members that require structural strength are arranged with sufficient space to ensure sufficient rigidity for the drive motor.

The stator core and the connecting fittings are fixed to each other with a 1B stator, which not only maintains the correct positional relationship, but also
Since the driving reaction force applied to the rotor is transmitted to the connecting fittings by fixing the stator, it is possible to provide a stable stator structure.

3j. Effects of the embodiment The effects have already been fully explained in the section of the structure and action, but they can be summarized as follows.

a. From the motor center line to the rail surface, the axle center, the center beam of the bogie,
The dimension in the direction below the floor can be configured to the theoretical minimum value.

b. The stator side structure can be disassembled into thin parts, making it easy to construct and durable.

C. Cooling of the stator side is extremely good.

d. The stator side core is assembled correctly and the necessary axial compressive force is applied.

(Other examples) FIG. 6 shows another embodiment of the invention.

In this case, the end fittings 3'l and 32 are equipped with ronas metal housings 31B and 328 suspension metals of 3'lA and 32A, so the long mounting surfaces such as 2A and 3A in Fig. 5 extend over the entire length of the motor. Since this is not necessary, the suspension metal @ construction can be placed separately on the 31.32 end fittings. In this case, the connecting fittings 33 and 34 and the motor nose 35 do not have long structures as shown in Figs. 1 to 5, but are directly connected to 23A using flanges 310 and 32C.

It is designed to be tightened with a 23B axial bolt.

In this way, if the suspension metals 318 and 32B can be separated into left and right sides as shown in FIG. 6, the motor structure can be constructed somewhat easily. However, as another embodiment, it is also possible to configure the suspension metal housings 31A and 32A in one piece, and use one suspension metal housing as the connection fittings 33 and 34.

Figure 7 shows another example of the structure shown in Figure 1, in which one stator core and two and four connecting fittings are fixed with weld beads instead of the protruding structure for fixing the stator in 1B. In addition to being convenient for receiving drive reaction force, if we add 8 axial bolts 23A and 23B for axial tightening, fix the stator core and place 36 weld beads, 12.13 Even if the end fittings are removed only during the assembly of the 1A stator winding, it is possible to expect a sufficient fixing effect for the stator core, which is advantageous from the standpoint of motor production.

Although the wooden embodiment has been described with respect to a hook-type drive motor, the present invention can also be applied to a trolley-mounted motor.

〔Effect of the invention〕

As described above, the effect of the embodiment explained in Section 3j can be obtained even in the induction motor structure shown in FIGS. 1 to 5 and in the other embodiments shown in FIGS. 6 and 7. However, when the peripheral dimensions are severely restricted and consideration must be given to cooling, such as in the case of a high-output motor, it is theoretically possible to obtain the minimum dimensions and good cooling performance at the same time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view perpendicular to the shaft of an induction motor according to the present invention, FIG. 2 is a sectional view also in the axial direction, and FIG.
4 is a perspective view of the induction motor of the present invention as seen from the motor nose side; FIG. Figure 6 is a perspective view of another embodiment of the present invention with a suspension metal structure, and Figure 7 is an embodiment in which the connecting fittings and the stator core are fixed by welding. 1... Stator core 1A. ...Stator winding 1B...Stator fixing 2.3, 4.5...Connection fittings 2A, 3A...Mounting surface 38.5A...Legs 5A...Motor nose 6
...Nose receiver rubber 7...Bolly center beam 8...
Axle 9... Suspension metal fitting 10... Wedge 11... Bolt 12.13... End fitting 14
...Mirror plate 15...''Iru (upper plate 16...Rotor 1x17...Rotor core 18.19...
Bearing 20...Rotation detector 21...Exhaust port 22A
, 22B...Axially mating U surface 23A, 23B axial bolt 24A, 24B...Mating U surface 25A,
25B... Combination bolt 26... Ventilation port 27
A, 27 [3...7 to lunge 28, 28B...
Concave surface for honge 29...Rail surface 30...Core holder 31.32...End fittings 31A, 32A...
・1J metal housing 31B, 32B...1)
-Smetal 31C, 32G...Flange 33, 3
4... Connection fittings 35... Motor nose 36.
・・Weld bead agent Ji′・! −'−1−:, close aide −(Yūdō
3;' Hidehirobun Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (4)

[Claims] (1) In a hook-type induction motor for a railway vehicle placed under the floor of a railway vehicle, the structure on the stator side is separated into the stator core in the center, the end fittings on both sides that support the rotor with bearings, and the structure on the axle side, On the rail surface side and the bogie middle beam structure side, the external dimensions of the end fittings are configured to be approximately the same as the stator core dimensions, and the connecting fittings that connect the end fittings are arranged at positions that avoid the axle, rail surface, and bogie middle beam. In addition, by providing the connecting fitting with a structure that tightens the end fittings on both sides in the axial direction, both end fittings are tightened in the vehicle direction by the connecting fittings, and the outer periphery of the stator core is An induction motor for a vehicle that is characterized by being directly exposed to the outside. (2) The induction motor for a vehicle according to claim 1, wherein the connection fitting arranged on the axle side constitutes a seat surface to which a suspension tube is attached. (3) The induction motor for a vehicle according to claim 1, characterized in that the connection fitting arranged on the middle beam side of the bogie also serves as a motor nose hooking structure. (4) An induction motor for a vehicle according to claim 1, characterized in that the rotor rotational reaction force can be received by a structural bite or weld bead between the connecting fitting and the field core. induction motor.