CN112350467A

CN112350467A - Subway alternating-current traction motor stator and stator notch potting process

Info

Publication number: CN112350467A
Application number: CN201910729642.8A
Authority: CN
Inventors: 王鑫; 白伟; 赵美茹; 张斌; 张武茹; 黄绍端
Original assignee: Yongji Zhong Car Electrical And Electrical Equipment Repair Co ltd
Current assignee: Yongji Zhong Car Electrical And Electrical Equipment Repair Co ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2021-02-09

Abstract

The invention is applicable to the technical field of alternating current motors, and provides a subway alternating current traction motor stator and a stator notch encapsulating process, which comprises a base assembly and a stator assembly, the machine base component comprises a machine base and a connecting flange, the connecting flange is fixedly connected with the machine base, and is sleeved at the front end and the rear end of the machine base, the stator component comprises an iron core, a winding, a wire slot, silicon rubber and a power supply connecting wire, the iron core is fixedly connected with the machine base, and is sleeved in the inner cavity of the machine base, the wire grooves punched by the iron core are uniformly and equidistantly positioned in the inner cavity of the machine base, by embedding silicon rubber in the gap between the winding and the notch of the iron core through the positioning ring and sealing the notch by using the cured Wacker ELASTOSILRT 622A/B bi-component glue which has very good thermal stability, sealing property and insulating property, the entering of dust and water vapor is reduced, and the fault rate of stator winding notch grounding is effectively reduced.

Description

Subway alternating-current traction motor stator and stator notch potting process

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a subway alternating-current traction motor stator and a stator notch encapsulating process.

Background

The stator coil grounding of an alternating current motor, particularly a traction motor, is the most common fault, more than 60% of grounding points are at a stator core slot, and the core is burnt in severe cases, and the two reasons are mainly that: (1) the stator core notch has sharp edges, the creepage distance between the winding coil and the iron core sharp edges is the shortest at the notch, and the iron core sharp edges have chamfers but can not avoid discharging with the coil. (2) The coil is provided with a bending area at the notch, a larger gap exists, and after the running time of the motor is longer, dust and dirt are easy to accumulate in the gap and attach to the surface of the coil, so that a conductive path is formed between the coil and the iron core, and grounding is caused. Therefore, it is necessary to design a new insulation structure and adopt new insulation materials to reduce the fault rate of the stator coil notch grounding.

Disclosure of Invention

The invention provides a subway alternating-current traction motor stator and a stator notch encapsulating process, and aims to solve the problem that the fault rate of stator winding notch grounding is high due to the fact that dust and water vapor enter a stator winding notch.

The invention is realized in this way, a subway AC traction motor stator and stator notch embedding process, including the base assembly and stator module, the said base assembly includes base and flange, the said flange is fixedly connected with said base, and the cover locates the front and back both ends of the said base;

stator module includes iron core, winding, wire casing, silicon rubber and power connecting wire, the iron core with frame fixed connection, and the cover is located the inner chamber of frame, the even equidistant setups of wire casing are in the inner chamber of winding, the iron core with iron core fixed connection, and be located the inner chamber of wire casing, power connecting wire with winding fixed connection, and run through in the frame extremely the outside of frame, silicon rubber with iron core fixed connection, and be located both ends around the wire casing.

The invention also provides a preferable silicon rubber which is Wacker ELASTOSILRT 622A/B bi-component rubber and the proportion is 9: 1.

The invention also provides the following preferable filling and sealing steps:

s1: vertically placing the machine base, and wiping the surfaces of the winding and the iron core in the encapsulation area by dipping white cloth in alcohol;

s2: taking out a positioning ring slightly smaller than the inner diameter of the iron core, coating silicone grease on the outer side wall of the positioning ring to prevent the positioning ring from being adhered to the iron core when the positioning ring is separated, winding a plurality of turns of the positioning ring by using a pressure-sensitive tape locally to adjust the tightness of the positioning ring and the iron core, and placing the positioning ring into a machine base;

s3: sealing the gap between the bottom of the positioning ring and the iron core by using glass cement to prevent silicon rubber from flowing out;

s4: mixing the Wacker ELASTOSIL RT622A/B bi-component glue in a beaker according to the ratio of 9:1, uniformly stirring, slowly pouring the mixture into a funnel, slowly moving the funnel along an iron core groove, pouring the mixed Wacker ELASTOSIL RT622A/B bi-component glue into the groove by groove, stirring with a round stick while pouring, facilitating the gas generated by chemical reaction to overflow, and enabling the liquid level of the bi-component glue to be flush with the end part of a positioning ring after filling and sealing.

S5: standing the stator for 24 hours at normal temperature until the silicon rubber is cured;

s6: and (4) removing the positioning ring, and cleaning the residual glue on the surfaces of the winding and the iron core.

The present invention also provides that preferably, the step of S2 includes:

s21: taking out a positioning ring slightly smaller than the inner diameter of the iron core;

s22: silicone grease is coated on the outer circle of the positioning ring, so that the positioning ring is prevented from being adhered to the iron core when being separated;

s23: the local part of the positioning ring is wound by a plurality of turns of pressure-sensitive tapes for adjusting the tightness of the positioning ring and the iron core;

s24: and placing the positioning ring into the machine base, and enabling the distance from the axial end face of the positioning ring to the end face of the iron core to be 25 mm.

Compared with the prior art, the invention has the beneficial effects that: according to the motor stator encapsulated with the silicon rubber and the encapsulating method, the silicon rubber is encapsulated in the gap between the winding RT622A/B and the notch of the iron core by using the positioning ring, and the solidified Wacker ELASTOSIL bi-component rubber winding RT622A/B has excellent thermal stability, sealing performance and insulating performance so as to seal the notch, so that the entering of dust and water vapor is reduced, and the fault rate of grounding of the notch of the stator winding is effectively reduced.

Drawings

FIG. 1 is a top view of the structure of the present invention;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a structural sectional view of the present invention.

In the figure: the motor comprises a base assembly 1, a base 11, a connecting flange 12, a stator assembly 2, an iron core 21, a winding 22, a wire casing 23, silicon rubber 24, a power connecting wire 25 and a positioning ring 3.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-3, the present invention provides a technical solution: a subway AC traction motor stator and stator notch potting process comprises a base assembly 1 and a stator assembly 2, wherein the base assembly 1 comprises a base 11 and a connecting flange 12, and the connecting flange 12 is fixedly connected with the base 11 and sleeved at the front end and the rear end of the base 11;

stator module 2 includes iron core 21, winding 22, wire casing 23, silicon rubber 24 and power connecting wire 25,

iron core

21 and 11 fixed connection of frame, and the inner chamber of frame 11 is located to the cover, the inner chamber of winding 22 is seted up to the even equidistant interval of wire casing 23,

iron core

21 and 21 fixed connection of iron core, and be located the inner chamber of wire casing 23,

power connecting wire

25 and 22 fixed connection of winding, and run through in the outside of frame 11 to frame 11,

silicon rubber

24 and 21 fixed connection of iron core, and be located wire casing 23 both ends around.

In the embodiment, the slot is sealed by using the potting silicon rubber 24 at the slot gap between the winding 22 and the iron core 21, so that dust and moisture are prevented from entering, and the fault rate of stator winding slot grounding is effectively reduced.

Further, the silicone rubber 24 is made of Wacker ELASTOSILRT 622A/B double-component rubber in a ratio of 9: 1.

In the embodiment, the Wacker ELASTOSILRT 622A/B bi-component adhesive is a silicone resin with strong fluidity, can be cured by heating or at normal temperature, is also a very soft and transparent silicone rubber, comprises RT622A/B bi-components, two groups are in liquid state at normal temperature, when the silicone rubber is used, the A/B two groups are mixed at a ratio of 9:1, and are cured for 24 hours at normal temperature, and the silicone rubber has very good thermal stability, sealing performance and insulating performance after being cured.

Further, the encapsulation steps are as follows:

s1: vertically placing the machine base 11, and wiping the surfaces of the winding 22 and the iron core 21 in the encapsulation area by dipping white cloth in alcohol;

s2: taking out a positioning ring slightly smaller than the inner diameter of the iron core 21; silicone grease is coated on the outer side wall of the positioning ring, so that the positioning ring is prevented from being adhered to the iron core when being separated, meanwhile, a pressure sensitive tape is wound on the part of the positioning ring for a plurality of turns so as to adjust the tightness of the positioning ring and the iron core, and the positioning ring is placed in the machine base 11;

s3: sealing a gap between the bottom of the positioning ring and the iron core 21 by using glass cement to prevent the silicon rubber 24 from flowing out;

s4: mixing the Wacker ELASTOSIL RT622A/B bi-component glue in a beaker according to the ratio of 9:1, uniformly stirring, slowly pouring the mixture into a funnel, slowly moving the funnel along a slot of an iron core 21, pouring the mixed Wacker ELASTOSIL RT622A/B bi-component glue into the slot by slot, stirring with a round stick while pouring, facilitating the gas generated by chemical reaction to overflow, and enabling the liquid level of the bi-component glue to be flush with the end part of a positioning ring after filling.

S5: standing the stator for 24 hours at normal temperature until the silicon rubber 24 is cured;

s6: and (4) removing the positioning ring, and cleaning the residual glue on the surfaces of the winding 22 and the iron core 21.

In the present embodiment, the silicone rubber 24 is molded by potting with a positioning ring, so that the silicone rubber 24 is molded uniformly.

Further, the step of S2 includes:

s21: taking out a positioning ring slightly smaller than the inner diameter of the iron core 21;

s24: and placing the positioning ring into the machine base 11, and enabling the distance from the axial end face of the positioning ring to the end face of the iron core 21 to be 25 mm.

In the embodiment, the pressure-sensitive tape is wound around the positioning ring, and the tightness between the positioning ring 3 and the iron core 21 can be adjusted due to the fact that the pressure-sensitive tape is made of soft materials, so that the positioning ring 3 is prevented from loosening in the filling and sealing process, and leakage and loss of the bi-component glue in the filling and sealing process are avoided.

The working principle and the using process of the invention are as follows: after the positioning ring is installed, the base 11 is vertically placed, white cloth is dipped in alcohol to wipe the surfaces of the winding 22 and the iron core 21 in the encapsulation area, so that the area to be encapsulated is cleaned, then the positioning ring 3 slightly smaller than the inner diameter of the iron core 21 is taken out, then silicone grease is coated on the outer circle of the positioning ring, the silicone grease and the silicone rubber 24 are not mutually dissolved, so that the subsequent positioning ring can be conveniently taken out, then a pressure sensitive tape is wound on the periphery of the positioning ring for a plurality of turns to adjust the tightness of the positioning ring 3 and the iron core 21, the positioning ring 3 is prevented from loosening or moving in the encapsulation process, and leakage and loss of bi-component glue are avoided in the encapsulation process. Then, the positioning ring is placed in the machine base 11, the distance between the axial end face of the positioning ring 3 and the end face of the iron core 21 is 25mm, the liquid level height of the silicon rubber 24 is determined, the gap between the bottom of the positioning ring and the iron core 21 is sealed by glass cement, the silicon rubber 24 is prevented from flowing out, then Wacker ELASTOSIL RT622A/B double-component glue is mixed in a beaker according to the ratio of 9:1, the mixture is uniformly stirred, then the mixture is slowly poured into a funnel, the funnel moves slowly along the notch of the iron core 21, the silicon rubber 24 is poured into the funnel by grooves, the stirring is carried out by a round stick while pouring, the reaction gas is convenient to overflow, the air holes are prevented from being generated inside the solidified silicon rubber 24, the stator is placed for 24 hours at normal temperature, after the silicon rubber 24 is solidified, the positioning ring is removed, the residual glue on the.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A subway AC traction motor stator is characterized in that: the motor comprises a base assembly (1) and a stator assembly (2), wherein the base assembly (1) comprises a base (11) and a connecting flange (12), and the connecting flange (12) is fixedly connected with the base (11) and sleeved at the front end and the rear end of the base (11);

stator module (2) includes iron core (21), winding (22), wire casing (23), silicon rubber (24) and power connecting wire (25), iron core (21) with frame (11) fixed connection, and the cover is located the inner chamber of frame (11), wire casing (23) are evenly equidistant to be seted up in the inner chamber of winding (22), iron core (21) with iron core (21) fixed connection, and be located the inner chamber of wire casing (23), power connecting wire (25) with winding (22) fixed connection, and run through in frame (11) extremely the outside of frame (11), silicon rubber (24) with iron core (21) fixed connection, and be located both ends around wire casing (23).

2. A subway ac traction motor stator as claimed in claim 1, wherein: the silicone rubber (24) is made of Wacker ELASTOSILRT 622A/B double-component rubber in a ratio of 9: 1.

3. The process for potting a stator slot of a subway alternating current traction motor as claimed in any one of claims 1-2, wherein: the encapsulating steps are as follows:

s1: vertically placing the machine base (11), and wiping the surfaces of the winding (22) and the iron core (21) in the encapsulation area by dipping white cloth in alcohol;

s2: taking out a positioning ring slightly smaller than the inner diameter of the iron core (21), coating silicone grease on the outer side wall of the positioning ring to prevent the positioning ring from being adhered to the iron core when the positioning ring is separated, winding a plurality of turns of the positioning ring by using a pressure-sensitive tape locally to adjust the tightness of the positioning ring and the iron core, and placing the positioning ring into the machine base (11);

s3: sealing a gap between the bottom of the positioning ring and the iron core (21) by using glass cement to prevent silicon rubber (24) from flowing out;

s4: mixing the Wacker ELASTOSIL RT622A/B bi-component glue in a beaker according to the ratio of 9:1, uniformly stirring, slowly pouring the mixture into a funnel, slowly moving the funnel along a slot of an iron core (21), pouring the mixed Wacker ELASTOSIL RT622A/B bi-component glue into the slot by slot, stirring by a round rod while pouring, and facilitating the gas generated by chemical reaction to overflow, wherein the liquid level of the bi-component glue is flush with the end part of a positioning ring after pouring.

S5: standing the stator for 24 hours at normal temperature until the silicon rubber (24) is cured;

s6: and (3) removing the positioning ring, and cleaning the residual glue on the surfaces of the winding (22) and the iron core (21).

4. The process of claim 3, wherein the process comprises: the step of S2 includes:

s21: taking out a positioning ring slightly smaller than the inner diameter of the iron core (21);

s24: and (3) placing the positioning ring into the machine base (11) to ensure that the distance from the axial end face of the positioning ring to the end face of the iron core (21) is 25 mm.