JPS60197132A - Stator for main motor for car body - Google Patents

Abstract

PURPOSE:To improve magnetic flux response property, by a method wherein a magnetic frame is provided with a fitting position having a concave circlar face and wherein a laminated core is provided with a joint face of the same radius of curvature as that of the concave circular face. CONSTITUTION:A stator 18 is provided with a magnetic frame 34 having a section of approx. octagonal shape. On the inner face of the magnetic frame 34, four fitting positions 36 are formed to be separated each other at an angle of 90 deg. along the circumference with the central shaft for the magnetic frame, each having a concave circular face 38 which is formed with the same radius R1 of curvature. Laminated cores 42 laminating a plurality of steel sheets are attached to each fitting position 36. Each laminated core 42 having a circular joint face 48 which is formed with the same radius of curvature as that of the concave circular face 38, is attached to the fitting positions 36 with the joint face 48 in contact with the concave circular face 38.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a stator for a vehicular traction motor, and particularly to a stator for a vehicular traction motor having a magnetic frame and a laminated core fixed to the inner peripheral surface of the magnetic frame. Concerning children.

[Technical Background of the Invention] Conventionally, as a stator for a traction motor for a vehicle, a cylindrical magnetic frame and a magnetic frame are disposed in close contact with the inner circumferential surface of the magnetic frame over the entire circumferential area thereof. A type equipped with a laminated iron core is known. This laminated iron core is formed by laminating a large number of thin plates in the axial direction of the magnetic frame, and serves to prevent the delay phenomenon of magnetic flux caused by changes in current and to rectify the magnetic flux. Furthermore, a plurality of main pole cores and auxiliary cores are attached within the magnetic frame, and each of the main pole coils and the auxiliary coils are wound around these cores.

In recent years, in order to effectively utilize the space within the magnetic frame, stators have been provided that use a magnetic frame having a hexagonal cross section instead of a cylindrical magnetic frame.

[Problems in the Background Art] However, when using a magnetic frame having a nonagonal cross section, it is extremely difficult to precisely process the inner peripheral surface of the magnetic frame into a nonagonal shape. In other words, it is difficult to accurately process the surface that contacts the inner peripheral surface of the magnetic frame. Therefore, it is difficult to mount the laminated core in close contact with the inner circumferential surface of the magnetic frame, resulting in a gap between the inner circumferential surface of the magnetic frame and the outer surface of the laminated core. This gap causes problems such as making the flow of magnetic flux non-uniform and deteriorating the magnetic flux response characteristics.

Further, the size of the gap often differs depending on the traction motor, and in this case, there is a drawback that the speed characteristics vary depending on the traction motor.

On the other hand, since a vehicular traction motor is usually installed within a limited space of a bogie, the external size of the magnetic frame is also limited. When increasing the capacity of the main motor to obtain a large driving force, it is also necessary to increase the external size of the magnetic frame. However, in this case, the space for installing the main electric motor in the chassis must be increased, resulting in a problem that the entire chassis becomes large.

[Objective of the Invention] This invention was made in view of the above points, and its object is to be able to improve various characteristics of a traction motor despite using a magnetic frame having a nonagonal cross section. Another object of the present invention is to provide a stator for a main motor that can increase the capacity of the main motor without increasing the size of the truck.

[Summary of the Invention] In order to achieve the above object, according to the stator of the present invention,
The magnetic frame has a plurality of mounting parts formed on the inner surface of the magnetic frame at equal intervals along the circumferential direction of a circle centered on its axis, and each having a concave arcuate surface with the same radius of curvature, and A housing groove is formed on the outer surface of the magnetic frame between the two mounting parts and is capable of housing at least a portion of the axle of the vehicle. Further, each laminated core has an arcuate abutment surface formed to have the same radius of curvature as the concave arcuate surface, and is attached to the mounting portion with this abutment surface in close contact with the concave arcuate surface.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 show the main electric motor m'+o connected to the bogie 12 of the vehicle.
It is shown installed on. An axle 16 having wheels 14 is rotatably attached to the truck 12. The main motor 10 includes a stator 18 and a bearing box 2 attached to the stator.
0, one end is supported by the axle 16 via a bearing box, and the other end is supported by the bogie 1 via the nose 22 and vibration isolating rubber 24.
It is supported by 2. Further, the main electric motor 10 is supported such that its rotating shaft 26 is positioned parallel to the axle 16. A small gear 28 is attached to the extending end of the rotating shaft 26 and meshes with a large gear 30 fixed to the axle 16. These gears 28 , 30 are covered by a gear case 32 attached to the stator 18 .

As shown in FIGS. 3 to 7, the stator 18 includes a magnetic frame 34 having a substantially hexagonal cross section. magnetic frame 3
Four mounting parts 36 are formed on the inner surface of the magnetic frame 4 at a distance of 90' from each other along the circumferential direction of a circle centered on the axis of the magnetic frame. These mounting portions 36 each have a concave arcuate surface 38 formed with the same radius of curvature R1. These arcuate surfaces 38 form a circle 4 centered on the axis of the magnetic frame 34.
The inner surface of the magnetic frame is formed by turning the inner surface of the magnetic frame with a radius R1 centered on points C1 and C2 spaced apart by 90 degrees on the magnetic frame. As can be clearly seen from FIG. 5, each arcuate surface 38 extends along the axial direction of the magnetic frame 34 from the middle part to one end.

Further, a laminated iron core 42 formed by laminating a large number of thin iron plates is attached to each mounting portion 36. Each laminated iron core 42 has a substantially crescent-shaped thin iron plate 4 shown in FIGS. 8 and 9.
4.45 are laminated in the axial direction of the magnetic frame 34, and as can be clearly seen from FIG. 7, thin iron plates 45 are laminated on both sides of the laminated portion made of thin iron plates 44. Note that the thin iron plate 44 has protrusions 46 at both ends thereof for forming main pole core attachment portions to be described later. Each laminated core 42 has an arcuate abutment surface 48 formed to have the same radius of curvature as the concave arcuate surface 38, and this abutment surface is brought into close contact with the concave arcuate surface to hold the mounting portion 36 in the 1c state. installed on. Further, each laminated core 42 is fixedly held in a state where it is pressurized in the lamination direction by a presser piece 50 welded to the inner surface of the magnetic frame 34. Note that the six holding pieces 50 have substantially the same cross-sectional shape as the thin iron plate 45.

In addition, between the mounting portions 36, a magnetic frame 34 and a thin iron plate 44 are provided.
The main pole core mounting portion 55 protrudes inwardly by the protruding portion 46 of
are formed respectively. Arc-shaped mounting surfaces 56 are formed at the protruding ends of each mounting portion 55, and main pole iron cores 54 are respectively mounted on these mounting surfaces with bolts 52.

The mounting surface 56 is formed by turning the protruding end of the mounting portion 55 at a radius R2 about the axis of the magnetic frame. Furthermore, four commutating pole cores 58 are arranged within the magnetic frame 34. Each commutating pole core 58 is attached to the inner surface of the laminated core 42 by bolts 60, respectively. and,
A main pole coil 62 is wound around each main pole iron core 54, and a commutating pole coil 64 is wound around each commutating pole iron core.

As can be clearly seen from FIG. 3, a housing groove 66 is formed in the outer surface of the magnetic frame 34 located on the axle 16 side. The accommodation groove 66 is formed between two adjacent mounting parts 36, that is, on the outside of the mounting part 55, and extends from one end of the magnetic frame 38 to the other end along the axial direction of the magnetic frame. Moshi X, main electric I
I! When the wheel 1110 is attached to the truck 12, a portion of the axle 16 is accommodated in the housing groove 66.

An annular side plate 68 is fixed to one end of the magnetic frame coaxially with the magnetic frame. Each side plate 68 has a mounting portion 36.
Four cooling ventilation lowers 0 located near are formed.

The stator 18 configured as described above has the following seven advantages.

First, the concave arcuate surface 38 of the mounting portion 36 to which the laminated core 42 is attached can be formed by turning, poling, or the like, making it easy to process and achieving high processing accuracy.

Moreover, since the abutting surfaces 48 of each laminated core 42 are also formed in an arc shape, they can be easily and accurately processed. Therefore, each laminated core 42 can be attached with its abutment surface 48 in complete contact with the concave arcuate surface 48, and no gap will occur between the abutment surface and the arcuate surface. Therefore, an unbalance of magnetic flux does not occur, and it is possible to prevent optical generation of shaft voltage and variations in speed characteristics for each main motor.

Further, the magnetic flux generated within the main motor 10 flows through the magnetic frame 34, the main pole core 54, the armature core 72, the main pole core, and the magnetic frame in this order, as shown in FIG. In this way, although the laminated core 42 is divided into four pieces, each piece is arranged along the flow of magnetic flux, so
This role can be fully fulfilled, and as a result, the magnetic flux response characteristics of the traction motor can be improved.

As shown in FIG. 3, the installation space for the main motor is usually defined by the distance between the axle 16 and the supporting end surface of the truck 12. However, since the magnetic frame 34 includes the housing groove 66 formed on its outer surface, it can be attached to the truck 12 with a portion of the axle 16 housed within the housing groove.

Therefore, even if the external dimension L1 of the magnetic frame 34 is made larger than the conventional one by the depth of the accommodation groove 66, it can be attached to the cart 12 without increasing the distance, that is, without increasing the size of the cart. , the capacity of the main motor can be increased. Since the laminated core 42 is not installed inside the part where the housing groove 66 is formed,
A recess for sinking the head of Pol]-52 can be formed at the bottom of the storage groove. Thereby, even if the receiving groove 66 is formed on the outer surface of the magnetic frame 34, there is no problem when attaching the main pole iron core 54.

Further, each laminated core 42 is fixed to the mounting portion 36 while being pressurized along the lamination direction by a holding piece 50.

Therefore, the laminated core 42 can be held firmly and stably, and when the main motor is operating or when a hole for attaching the main pole core is formed in the laminated core 42, the laminated core moves and the concave arc surface 38 The close contact between the contact surface 48 and the contact surface 48 will not change or the thin iron plate will not shift.

The embodiments described above are for explaining the present invention, and the present invention is not limited to the embodiments described above, but can be modified in various ways within the scope of the invention.

For example, as shown in FIG. 10, the main pole core claw (=J surface 56) may be formed flat. In this case, there is no need for the main pole core mounting portion 55 to protrude inward, and the iron plate 4
It is also not necessary to provide protrusions 46 at both ends of the tube (see FIG. 8). Therefore, a laminated core can be formed using 451 types of thin iron plates.

FIG. 11 shows various iron plates 44 forming the laminated iron core 42.
45 shows an example of a large box in which a commutating pole core mounting portion 74 that protrudes inward is provided in the center of the box. According to this embodiment, the mounting surfaces of the main pole core mounting portion 55 and the commutating pole core mounting portion 74 can be cut simultaneously.

Moreover, FIG. 12 shows still another embodiment.

According to this embodiment, each mounting portion has shoulders 75.
76, and one shoulder portion 76 is formed to be inclined by an angle θ. The laminated core 42 is mounted between these shoulders and fixed under pressure in the lamination direction by a holding piece 5o having an inclined surface driven between the laminated core and the shoulder 76. There is.

Furthermore, according to the embodiment shown in FIG.
The laminated iron core 42 is attached to one magnetic frame and fixed under pressure with a presser piece 50, and then the other magnetic frame is fixed to one magnetic frame with bolts 78.

In each of the embodiments shown in FIGS. 10 to 13, the same effects as in the first embodiment described above can be obtained by
can be done.

[Effects of the Invention] As described in detail above, according to the stator of the present invention, the magnetic frame is provided with a mounting portion that has a concave arcuate surface, and
The laminated core has a contact surface having the same radius of curvature as the concave arc surface, and is attached to the magnetic frame with this contact surface in close contact with the concave arc surface.

The magnetic frame also includes a housing groove that can accommodate at least a portion of the axle. Therefore, according to this stator, m
The i-iron core can be installed in complete contact with the magnetic frame, improving the magnetic flux response characteristics and preventing variations in the speed characteristics of each traction motor, resulting in improved performance and stability of the traction motor. can be achieved.

Further, even if the external dimensions of the magnetic frame are increased, it can be accommodated within the installation space of the truck, and the capacity of the main motor can be increased without increasing the size of the truck.

[Brief explanation of drawings]

1 to 9 show a main motor equipped with a stator according to an embodiment of the present invention, and FIGS. 1 and 2 are plan views respectively showing the main motor mounted on a bogie of a vehicle. and a side view, FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1, FIG. 4 is a schematic sectional view taken along the line IV--IV in FIG. 1, and FIGS. 5 to 7 are Figure 24 (7) mV-V,
8 and 9 are plan views respectively showing different thin iron plates, and FIG. The cross-sectional views of the electric motor, FIGS. 11 to 13, are cross-sectional views schematically showing main parts of different embodiments. 12... Truck, 16... Axle, 18... Stator,
26... Rotating shaft, 34... Magnetic frame, 36... Mounting part, 38... Concave arc surface, 42... Laminated iron core, 48
...Abutment surface, 66...Accommodation groove. Applicant's representative Patent attorney Takehiko Suzue Figure 1 14 Figure 2 n 11 16 3rd prisoner 8 Figure 4 5rIA Figure 6 Figure 7 Figure 91 Figure 10 Figure 11 Figure 14 Figure 12 Flash Figure 13

Claims (1)

[Claims] An electric vehicle for a vehicle comprising a magnetic frame having a substantially rectangular cross section, and a plurality of laminated iron cores made of a large number of thin plates laminated along the axial direction of the magnetic frame and attached to the inner surface of the magnetic frame. m
In the stator, the magnetic frame has a plurality of concave arcuate surfaces formed on the inner surface of the magnetic frame at equal intervals along the circumferential direction of a circle centered on the axis of the magnetic frame, each having the same radius of curvature. an i-tube portion, and a housing groove formed on the outer surface of the magnetic frame between two adjacent mounting portions and capable of accommodating at least a portion of the axle of a vehicle, and each of the laminated cores has a concave arc surface. A presser member having an arc-shaped abutting surface formed with the same radius of curvature and being attached to the mounting part with this abutting surface in close contact with the concave arcuate surface, and fixed to the magnetic frame. A stator for a traction motor for a vehicle, characterized in that the stator is held in a pressurized state along the stacking direction by a stator.