WO2015154220A1

WO2015154220A1 - Method and device for stacking and fixing stator core used in traction motor of narrow gauge locomotive

Info

Publication number: WO2015154220A1
Application number: PCT/CN2014/074895
Authority: WO
Inventors: 杨振中; 唐子谋; 丁禄振; 王冬梅; 程利; 余超
Original assignee: 南车株洲电机有限公司
Priority date: 2014-04-08
Filing date: 2014-04-08
Publication date: 2015-10-15
Also published as: CN106415993A; AU2014390614A1; ZA201606700B; AU2014390614B2

Abstract

Disclosed are a method and a device for stacking and fixing a stator core used in a traction motor of a narrow gauge locomotive, wherein stopper ports, which match with the outer diameter of the stator core lamination, are provided on the sides of clamp rings at two ends of the motor stator near the core, the nominal dimension of the stopper port diameter is the same as the outer diameter of a punching sheet, the two ends of the stator core lamination are clamped within the stopper ports of the clamp rings at two ends of the stator, a transition fit being formed therebetween, and the fitting relationship being ensured by a tolerance zone of size; the stator core of the motor is mainly divided into two portions, i.e. a portion intruded into the clamp rings and a portion exposed to the outside; the exterior of the punching sheet of the portion intruded into the clamp ring is provided with notches which are distributed evenly, and the number of punching sheets which are intruded into the clamp ring is adapted to the depth of the stopper port of the clamp ring; the number of punching sheets exposed to the outside is determined according to the total length of the core; the portion intruded into the clamp rings at the two ends are formed into a certain height of laminations by means of stacking in advance, and the punching sheets intruded into the clamp rings are partially stacked and fixed as a whole by means of welding at the notches, thereby forming a welded lamination.

Description

TECHNICAL FIELD The present invention relates to a method and a device for manufacturing a traction motor for a locomotive, and particularly to a method and a device for fixing a stator core of a traction motor for a narrow-gauge locomotive It is mainly used for the production of narrow-gauge locomotives. Background technique

There are wide rails and narrow rails in railways. In China, narrow rail railways mainly include state-owned railways, local railways, forest railways, industrial and mining railways, and railways. In the world, narrow-gauge railways are mainly distributed in developing countries such as Asia, Africa and Latin America. In developed countries, Australia and South Africa have more than 20,000 km of narrow-gauge railways with a track gauge of 1067 mm.

Coal and ore resources in these countries are the basis and dominance of their resources. Due to the limitation of the space environment of the mine roadway, the electric locomotives that transport ore, materials and personnel generally adopt narrow-gauge locomotives. Narrow rails are less costly to construct, have a smaller radius of curvature, and are lighter in weight, allowing for larger route grades. Therefore, narrow-gauge locomotives have become one of the most important electromechanical devices in coal mine production and transportation.

However, due to the smaller size of the narrow rail, the core power traction motor of the narrow gauge locomotive is also severely limited in the axial space, which makes the structural design of the stator base more difficult. The stator frame of the traction motor of the locomotive generally adopts the inorganic shell rib welded structure, which is mainly composed of iron core, pressing ring, rib plate (pull plate) and junction box. The iron core is formed by laminating cold-rolled silicon steel sheets, and the pressing ring and the ribs (pull plates) are respectively matched with the end faces and the outer circle of the iron core, and are welded by the ribs (pull plates) and the pressing rings at both ends. After pressing, the core is clamped and fixed to form a solid fit. The stator frame of the narrow-gauge locomotive traction motor also adopts this basic structure, but due to the limitation of the axial space, the iron core often encroaches on the partial size of the pressure ring at both ends, making the design of the pressing ring and even the entire stator frame more difficult. Therefore, how to achieve the reliable clamping and fixing of the iron core and the stability of the stator frame without affecting the strength and rigidity of the pressure ring at both ends, and ensure the reliability of the stator frame as a whole, is the stator machine of the narrow-rail locomotive traction motor. The problem of the design of the seat structure is urgent. The domestic patent document search has not found the same technology directly related to the present invention, but there are some related literature reports, and the following are mainly related to the present invention:

1. Patent No. CN201320272074. 1, the invention patent entitled "A narrow-gauge mine frequency conversion traction motor", which discloses a narrow-gauge mine frequency conversion traction motor with deep grooves on the outer surface of the variable-frequency traction motor Thread. The utility model has the following technical effects, and the deep groove thread is processed on the outer surface of the frequency conversion traction motor, thereby effectively increasing the surface area of the outer casing, and changing the ratio of the thread pitch and the thread depth without increasing the outer diameter of the casing, Can be changed precisely The surface area of the base meets the heat dissipation effect of the motor. Solved the technical problem of motor cooling. A narrow-track mining frequency traction traction motor has deep groove threads on the surface of the casing of the variable frequency traction motor. The utility model has the following technical effects, and the deep groove thread is processed on the outer surface of the frequency conversion traction motor, thereby effectively increasing the surface area of the outer casing, and changing the ratio of the thread pitch and the thread depth without increasing the outer diameter of the casing, The surface area of the base can be precisely changed to meet the heat dissipation effect of the motor. Solved the technical problem of motor cooling.

2. Patent No. CN201210068458. 1, the invention patent entitled "A laminated core and a manufacturing method thereof", which discloses a laminated core for a motor, such as an electric motor, the laminated iron The core includes unit laminations laminated in at least one laminate, and the unit laminations are formed of a soft magnetic composite material, wherein each of the powder particles forming the soft magnetic composite material is covered with an insulator. A preferred embodiment of the present invention is capable of manufacturing the iron core by a lamination method using the soft magnetic composite material, improving mechanical strength of the iron core of the soft magnetic composite material, and by forming the soft magnetic composite The application of an insulator on the powder particles of the material reduces the core loss.

3. Patent No. CN201210227506. 7, the invention patent entitled "Manufacturing Method of Stator Core of Electric Motor", which discloses a method for manufacturing a stator core suitable for automation, which has the following steps: Performing lamination to prepare a plurality of sets of teeth (S1) which are laminated together; and arranging a plurality of teeth connected by the edging material into a ring shape to prepare a ring tooth

(S2); connecting a plurality of sets of teeth and ring teeth that are stacked together, and connecting a plurality of sets of teeth (S3) that are stacked together with a lap joint; and stacking the plurality of sets connected by the lap joint The teeth are respectively wound (S4); the intermediate position of the lap material is stretched toward the center, so that the plurality of sets of the pressed teeth are closer to the center direction (S5); the burr is removed by punching (S6).

4. The patent number is CN201210045801. 0, the invention patent of "a laminated core and its manufacturing method", which discloses a large and medium-sized motor stator core, especially related to stacking on a horizontal press machine A large and medium-sized motor stator core lamination tooling. The tooling is laminated on a horizontal press machine, and the stacking tool comprises a tooling body, a tooling and a spindle positioning connecting plate, a pressing plate, a rear clamping plate and a front clamping plate. The large and medium-sized motor lamination tooling designed by the invention ensures that the quality, precision and various indexes of the stator core are in conformity with the design requirements of the stator core; the radial loosening lamination in accordance with the lamination, the radial tensioning Flat, to ensure the accuracy meets the standard, after pressing, welding or fastening, the working principle of radial release is released. 5, Patent No. CN96121836. 3, the invention patent entitled "Laminated iron core and its manufacturing method", the patent discloses a laminated core, wherein each thin chip is stamped according to a predetermined structural size. And stacking them one by one, and then using the continuous irradiation or spot irradiation of the laser beam to irradiate the plurality of pads at the edge of each chip to fuse the chips together to form two end faces, The chip is characterized in that a chip constituting one end surface of the iron core has a first notch corresponding to a half of the lands of the lands, and a chip constituting the other end face of the core has a second notch corresponding to the other half of the lands. The half pad of the chip constituting the other end face of the core corresponds to the other half pad of the chip constituting the one end face of the core.

6, related papers related to the invention has the following one, "Electric Locomotives & Mass Transit Vehicles" 2003 01 Author: Zeng Mei Yang, the paper entitled "Research whole stator laminations welding process," the paper noted. " A large number of tests have been carried out on the welding of large full-stack motor bases. From the aspects of welding methods, welding materials and welding specifications, a series of test data have been obtained to determine the welding stress and deformation. The small welding process makes the welding quality of the fully laminated motor base fully meet the design requirements. Welding structure analysis: The fully laminated motor stator consists of front and rear pressing rings, silicon steel sheets, upper and lower hanging ribs, connecting ribs The upper and lower suspension ribs are symmetric to the motor side, and the connecting ribs are evenly distributed on the motor stator circumference. The composite structure is shown in Figure 1. The full laminated motor stator weld types are: (1) ribs The joint with the silicon steel sheet; (2) the butt joint of the rib and the press ring; (3) the joint between the upper and lower hanging ribs and the silicon steel sheet and the butt joint with the front and rear press rings. The mold is assembled in the order of the stator front pressure ring, the tooth pressure plate 1, the silicon steel sheet, the tooth pressure plate 2, the stator rear pressure ring, and is pressurized by the hydraulic press, and then the screw mold is fixed with the motor stator by the screw. It is fixed on the welding positioner by welding tooling, which is convenient for the symmetrical welding of the machine base. Although the above patents and papers relate to the structure of the stator core of the motor and the method of laminating the same, it can be seen that these patents are all It does not involve how to solve the axial space tension of the narrow-gauge traction motor, which causes the iron core to invade the partial size of the pressure ring at both ends, making the design of the pressing ring and even the entire stator frame difficult to increase, so it is necessary Improve this. Summary of the content

The technical problem to be solved by the invention is: a novel stator core lamination fixing method for a narrow-gauge locomotive traction motor and a stator core intrusion to the stator compression ring at both ends for a narrow axial traction motor Device, the method And the device can effectively solve the influence of the narrow rail on the axial space tension of the traction motor of the locomotive. While not affecting the mechanical strength and rigidity of the stator base as a whole, it is ensured that the iron core lamination has a good fixed centering effect when the area coverage of the pull plate is small, and the stator frame is ensured to be stable and reliable.

The technical solution proposed according to the object of the present invention is: a stator core lamination fixing method for a narrow-gauge locomotive traction motor, which is disposed on the iron core side of the stator at both ends of the motor and the outer diameter of the stator core lamination The matching opening has the same nominal diameter as the outer diameter of the punching piece. The two ends of the stator core lamination are caught in the end of the stator pressing ring at both ends, and the two are in a transitional fit. Guarantee; The stator core of the motor is divided into two parts, that is, the part that invades the pressure ring and the exposed part, and the outer circumference of the punching piece that penetrates the pressure ring is provided with a uniform notch, and the punching into the pressure ring The number of pieces matches the depth of the pressing ring; the number of exposed pieces is determined according to the total length of the core; the part of the pressing ring that is indented at both ends is pre-laminated into a certain height of lamination, and at the notch The laminated portion of the punching piece that invades the press ring is fixed as a whole by welding to form a welded laminated piece.

Further, the stator core lamination is divided into two parts: a welding lamination and a free lamination; the welding lamination is a part of the stator core lamination laminated and then welded by gas shield welding to form a welding Lamination; When laminating, place the welding lamination in the end of the pressure ring at both ends, place the remaining free lamination in the middle, press the pressure ring at both ends through the hydraulic press, and then pass the rib (or pull plate) Welding to fix the crimping rings at both ends, thereby clamping the stator core laminations.

Further, the notch is of a "U" shape or a semicircular shape, and the notch of the lamination is not higher than the outer surface of the lamination after welding.

Further, the core laminations and the ribs (pull plates) are also integrally formed by the fillet welds on both sides of the ribs (pull plates). That is, the punching pieces in the intrusion ring are fixed by welding, and the welding laminations and the free laminations are fixed by the fillet welds, so that the two end pressing rings, the ribs (pull plates), the welding laminations and the free laminations The connection is a solid whole.

Further, the depth of the stop is determined according to the distribution of the axial space of the motor.

Further, the diameter of the opening is determined according to the outer diameter of the core lamination, and the tolerance is determined by considering the dimensional deviation of the lamination of the iron lamination to ensure that the coaxiality of the two is fixed. Heart effect.

According to the above method, a stator core lamination fixing structure for a narrow-gauge locomotive traction motor is a stator core lamination fixing device for a narrow-gauge locomotive traction motor, comprising a stator pressing ring and a stator core lamination, in the motor The stator press ring at both ends is provided with a stop corresponding to the outer diameter of the stator core lamination on the iron core side, the nominal size of the stop diameter is the same as the outer diameter of the punching piece, and the two ends of the stator core lamination are stuck at both ends In the stop of the stator pressure ring, the transition between the two is made, and the mating relationship is guaranteed by the dimensional tolerance band. The stator core of the motor is divided into two parts, that is, the part that invades the press ring and the exposed part, and the part that invades the press ring. The outer circumference of the punching piece is provided with a uniform notch, and the number of punching pieces invading the pressing ring is matched with the depth of the pressing ring; the bare outer The number of punching pieces is determined according to the total length of the iron core; the portions of the pressing ring that are intruded at both ends are pre-laminated into a certain height laminated piece, and the laminated portion of the punching piece that invades the pressing ring is fixed by welding at the notch. In one piece, a solder laminate is formed.

Further, the notch is of a "U" shape or a semicircular shape, and the notch of the lamination is ensured that the outer surface portion after welding is higher than the outer circumferential surface of the lamination.

Advantageous Effects of the Invention: The present invention divides a part of the stator core lamination into two parts, a part of the stator core pieces are laminated together and then welded by gas shield welding to form a welding lamination, and the welding lamination is passed through the tooling It is placed in the stop of the stator pressing ring, which can effectively solve the limitation of the axial space of the stator frame of the traction motor of the narrow-gauge locomotive. The iron core often encroaches on the partial size of the pressing ring at both ends, resulting in the stator pressing ring and the stator core. The problem of conflicts in the spatial size distribution of the laminations ensures that the core lamination has a good fixed centering effect in the case of a small area coverage of the pull plate, ensuring the stability and reliability of the stator frame. The embodiment of the invention is simple, easy to be engineered, and the lamination fixing method is firm and reliable, and is suitable for the manufacture of the stator frame of the traction motor of the narrow-gauge locomotive. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of an embodiment of the present invention; FIG. 2 is a schematic view showing the structure of a stator core lamination according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described with reference to the accompanying drawings and embodiments.

It can be seen from the drawings that the present invention is a stator core lamination fixing method for a narrow-gauge locomotive traction motor, in the motor The stator pressure ring at both ends is arranged on the iron core side to match the outer diameter of the stator core lamination. The nominal size of the nozzle diameter is the same as the outer diameter of the punching piece, and the two ends of the stator core lamination are clamped at both ends of the stator. In the ring of the ring, the transition between the two is matched, and the matching relationship is guaranteed by the dimensional tolerance band. The stator core of the motor is divided into two parts, that is, the part that invades the pressure ring and the exposed part, and the part that invades the pressure ring. The outer circumference of the sheet is provided with a uniform notch, and the number of punching pieces invading the pressing ring is matched with the depth of the pressing ring; the number of the punched pieces exposed is determined according to the total length of the iron core; The portion is pre-laminated into a certain height lamination, and the lamination portion of the punching intrusion ring is fixed as a whole by welding at the notch, and further, the stator core lamination is divided into welding. a laminated piece and a free laminated piece; the welded laminated piece is laminated by a part of the stator core punching piece and welded by gas shield welding to form a welded laminated piece; when laminating, the welded laminated piece is placed In the mouth of the pressure ring at both ends, Remaining free placed between the laminations, then the hydraulic machine by pressing both ends of the pressure ring, and then through the ribs (or tie plate) are welded to both ends of the pressure ring is fixed, so that the clamping of the stator core laminations.

The stator core lamination fixing structure for a narrow-gauge locomotive traction motor according to the above method is a stator core laminating fixing device for a narrow-gauge locomotive traction motor, comprising a stator pressing ring 1 and a stator core lamination 2, At both ends of the motor, the stator press ring 1 is provided with a stop 3 which is matched with the outer diameter of the stator core lamination on the side of the iron core. The nominal size of the stop diameter is the same as the outer diameter of the punch, and the two of the stator core laminations 2 The end card is in the end 3 of the stator pressing ring 1 at both ends, and the two are in a transitional fit, and the mating relationship is ensured by the dimensional tolerance band; the stator core of the motor is divided into two parts, that is, the stator pressing ring 1 is invaded at both ends. The portion inside the mouthpiece 3 and the exposed portion, the portion of the punching piece that intrudes into the stopper 3 of the stator ring 1 at both ends is provided with a uniform notch 7 on the outer circumference of the punching piece, and the number of punching pieces invading the pressing ring It is basically matched with the depth of the pressing ring; the number of exposed punches is determined according to the total length of the iron core; the portion of the pressing ring that invades both ends is pre-laminated into a certain height laminated piece and passed through the notch 7 The welding will fix the laminated part of the punching piece that invades the pressing ring as a whole A soldering lamination 4 is formed, and a free lamination 5 is formed between the two welding laminations 4; a tooth pressing plate 6 is provided on one side of the two welding laminations 4 against the stator pressing ring 1, and the welding lamination 4 is fixed. Further, the stator core lamination 2 is divided into two parts: a solder lamination 4 and a free lamination 5; the solder lamination 4 is laminated by a part of the stator core sheets and then welded by gas shielded welding. Forming a welded laminate; when laminating, placing the welded laminate in the mouth 3 of the pressure ring at both ends, placing the remaining free laminate 5 in the middle, pressing the two ends through the press, and then passing The ribs 8 (or pull plates) are welded to secure the crimping rings at both ends to clamp the stator core laminations.

Further, the notch 7 is of a "U" type or a "V" or a semicircular shape, and the notch 7 of the lamination is ensured that the outer surface portion after welding is higher than the outer circumferential surface of the lamination.

Further, the core laminations and the ribs 8 (pull plates) are also integrally formed by the fillet welds on both sides of the ribs 8 (pull plates). That is, the punching pieces in the intrusion ring are fixed together by welding, and the welding laminations 4 and the free laminations 5 are fixed by the fillet welds. Therefore, the stator pressing ring at both ends, the ribs 8 (pull plates), and the welding stack The sheet 4 and the free laminate 5 are joined as a solid unit.

Further, the depth of the port 3 is determined according to the distribution of the axial space of the motor.

Further, the diameter of the opening 3 is determined according to the outer diameter of the core lamination, and the tolerance is determined by considering the dimensional deviation of the lamination of the iron lamination to ensure the coaxiality of the two is achieved. Centering effect. Advantageous Effects of the Invention: The present invention divides a part of the stator core lamination into two parts, and a part of the stator core lamination pieces are laminated together and then welded by gas shield welding to form a welding lamination, when laminating, and welding The laminations are placed in the stopper of the stator pressing ring by the tooling, and the remaining laminations are placed in the middle, and then the ferrules (sliding plates) are welded to fix the pressing rings at both ends, thereby tightening the iron core. At the same time, the core laminations and the ribs (pull plates) are also formed into one piece through the fillet welds on both sides of the ribs (pull plates). That is, the punching pieces in the intrusion ring are fixed together by TIG welding, and the welding laminations and the free laminations are fixed by the fillet welds, so that the two ends of the pressing ring, the ribs (pull plates), the welding laminations and the free stack The connection of the pieces is a stable whole; this can effectively solve the limitation of the axial space of the stator frame of the traction motor of the narrow-gauge locomotive, the iron core often encroaches on the partial size of the pressure ring at both ends, resulting in the stator compression ring and the stator core lamination There is a conflict in the space size distribution, which ensures that the core lamination has a good fixed centering effect when the area of the pull plate is small, ensuring the stability and reliability of the stator frame. The embodiment of the invention is simple, easy to be engineered, and the lamination fixing method is firm and reliable, and is suitable for the manufacture of the stator frame of the traction motor of the narrow rail locomotive.

It is to be understood that the above-described embodiments are merely illustrative of the invention, and are merely illustrative of the several embodiments of the invention, and any modifications and substitutions of ordinary skill in the art are within the scope of the invention.

Claims

claims

1. A method for laminating and fixing stator cores for narrow-gauge locomotive traction motors, which is characterized in that, at both ends of the motor, the stator pressing rings are provided with stop openings that match the outer diameter of the stator core laminations on the iron core side. The nominal size of the diameter is the same as the outer diameter of the punched sheet. The two ends of the stator core lamination are stuck in the openings of the stator pressure rings at both ends. There is a transition fit between the two. The fit relationship is guaranteed by the dimensional tolerance zone; the stator core of the motor It is divided into two parts, namely the part that invades the pressure ring and the exposed part. The outer circle of the punched piece that invades the pressure ring is provided with evenly distributed notches, and the number of punched pieces that invades the pressure ring is equal to the number of the pressure ring. The depth of the opening is matched; the number of exposed punched sheets is determined based on the total length of the iron core; the parts that invade the pressing rings at both ends are pre-laminated into a certain height lamination, and the parts that invade the pressing rings are welded at the notch. The punched portion of the lamination is fixed as a whole to form a welded lamination.

2. The stator core stacking and fixing method for narrow-gauge locomotive traction motors according to claim 1, characterized in that the stator core laminations are divided into two parts: welded laminations and free laminations; the welding laminations The lamination is made of a part of the stator core punched sheets that are laminated together and then welded by gas shielded welding to form a welded laminate; when laminating, place the welded laminate in the openings of the pressure rings at both ends, and place the remaining free space in the middle. The laminations are then compressed by a hydraulic press to tighten the pressing rings at both ends, and then welded with rib plates (or pull plates) to fix the pressing rings at both ends, thereby clamping the stator core laminations.

3. The stator core stacking and fixing method for narrow-gauge locomotive traction motors as claimed in claim 2, characterized in that the notches are "U" shaped or semicircular, and the notches of the laminations are ensured during welding. The rear outer surface is not higher than the outer circular surface of the lamination.

4. The stator core stacking and fixing method for narrow-gauge locomotive traction motors according to claim 3, characterized in that, the iron core laminations and rib plates (tension plates) are laminated and fixed through fillet welds on both sides of the rib plates (tension plates). board) also form a whole. That is, the punched sheets that invade the pressing ring are fixed together by notch welding, and the welded laminations and free laminations are fixed together by fillet welds. Therefore, the press rings at both ends, rib plates (pull plates), welding laminations and free laminations are The laminations are connected into a stable whole.

5. The stator core stacking and fixing method for narrow-gauge locomotive traction motors according to claim 2, characterized in that the depth of the notch is determined according to the distribution of the axial space of the motor.

6. The stator core lamination fixing device for narrow-gauge locomotive traction motors according to the method of claim 1, including a stator pressing ring and a stator core lamination, characterized in that, at both ends of the motor, the stator pressing rings are against the iron core There is a stop on the side that matches the outer diameter of the stator core lamination. The nominal size of the stop diameter is the same as the outer diameter of the punched sheet. The two ends of the stator core lamination are stuck in the sub-openings of the stator pressure rings at both ends. The fitting relationship is guaranteed by the dimensional tolerance zone; the stator core of the motor is divided into two parts, namely the part that invades the pressure ring and the exposed part. The outer circle of the punched piece of the part that invades the pressure ring is provided with uniform The notch of the cloth, and the number of punched pieces that invade the press ring matches the depth of the press ring stop; the number of exposed punched sheets is determined based on the total length of the iron core; the parts that invade the press rings at both ends are pre-laminated into Stack the sheets to a certain height, and fix the punched sheet parts that invade the pressing ring into a whole by welding at the notches to form welded stacks. claims

7. The stator core lamination fixing device for narrow-gauge locomotive traction motors according to claim 6, characterized in that the stator core laminations are divided into two parts: welded laminations and free laminations; the welding laminations The lamination is made of a part of the stator core punched sheets that are laminated together and then welded by gas shielded welding to form a welded laminate; when laminating, place the welded laminate in the openings of the pressure rings at both ends, and place the remaining free space in the middle. For lamination, the pressing rings at both ends are compressed by a press, and then the pressing rings at both ends are welded through rib plates (or pull plates) to clamp the stator core laminations.

8. The stator core lamination fixing device for narrow-gauge locomotive traction motors according to claim 7, characterized in that the notch is "U" shaped or "V" or semicircular, and ensures the lamination. The outer surface of the notch after welding shall not be higher than the outer circumferential surface of the lamination.

9. The stator core stacking and fixing device for narrow-gauge locomotive traction motors as claimed in claim 8, characterized in that the iron core laminations and rib plates (tension plates) are connected through fillet welds on both sides of the rib plates (tension plates). board) also form a whole. That is, the punched sheets that invade into the pressing ring are fixed together by welding, and the welded laminations and free laminations are fixed together by fillet welds. Therefore, the press rings at both ends, rib plates (pull plates), welded laminations, and free laminations are Connected into a solid whole.

10. The stator core lamination fixing device for narrow-gauge locomotive traction motors according to claim 7, characterized in that the depth of the notch is determined according to the distribution of the axial space of the motor. The diameter of the stop is determined based on the outer diameter of the core laminations, and its tolerance is determined by considering the dimensional deviation of the core laminations after lamination to ensure that the coaxiality of the two achieves a centering effect.