阅读说明：本技术 电机高压线圈嵌线方法 (Motor high-voltage coil inserting method ) 是由 邓勇 杨新胜 张建伟 潘标 宋舰 王跃峰 窦义伟 杨龙 李玲 于 2019-09-26 设计创作，主要内容包括：本发明公开的是电机维护技术领域的一种电机高压线圈嵌线方法,主要改进点在于,在嵌线到最后一个节距线圈时,先利用调压器对线圈进行加热升温,待绝缘层软化后利用专用吊绳套在线圈上层边的直线段与端部斜边的拐弯处,向上拉动专用吊绳使线圈绕下层边转动,从而将线圈上层边吊到预定高度,为最后一个节距线圈的嵌线留出空间,当最后一个节距线圈嵌线完成后,再对吊把的线圈进行加热回位。该方法利用调压器对线圈进行加热,软化绝缘层,在吊把过程中就可避免吊绳与绝缘层的挤压破损,防止线圈直线段与定子槽之间出现扭转破损,也能便于最后一个节距线圈的嵌线操作,从而降低了劳动强度,提高了整个嵌线操作的效率和质量。(The invention discloses a motor high-voltage coil inserting method in the technical field of motor maintenance, which is mainly characterized in that when inserting a coil to a coil with the last pitch, a voltage regulator is used for heating the coil, after an insulating layer is softened, a special lifting rope is sleeved on a straight line section on the upper layer side of the coil and a corner on the inclined edge of an end part, the special lifting rope is pulled upwards to enable the coil to rotate around the lower layer side, so that the upper layer side of the coil is lifted to a preset height, a space is reserved for inserting the coil with the last pitch, and after inserting the coil with the last pitch, the coil of a lifting handle is heated and returned. The method utilizes the voltage regulator to heat the coil, softens the insulating layer, can avoid the extrusion damage of the lifting rope and the insulating layer in the process of hanging the handle, prevents the torsion damage between the straight-line section of the coil and the stator slot, and can facilitate the wire embedding operation of the last pitch coil, thereby reducing the labor intensity and improving the efficiency and the quality of the whole wire embedding operation.)

1. The motor high-voltage coil wire inserting method is characterized by comprising the following steps:

a. conventional wire embedding: performing coil inserting operation on the coil before the last pitch by using a conventional method;

b. preparation work: preparing a voltage regulator, a cable and a temperature measuring instrument;

c. heating the first pitch coil: firstly, connecting a wire inlet head and a wire outlet head of a coil in a first pitch with a voltage regulator by using a cable, then switching on a power supply of the voltage regulator to heat the coil, detecting the surface temperature of the linear part of the coil by using a thermodetector, and when the temperature reaches above 80 ℃, switching off the power supply and disconnecting the connecting cable;

d. thermal state hanging handle: a special lifting rope is sleeved at a turning position of a straight line section of the upper layer side of the coil and the inclined edge of the end part, and the special lifting rope is pulled upwards to enable the coil to rotate around the lower layer side, so that the upper layer side of the coil is lifted to a preset height, and a space is reserved for the coil inserting of the last pitch coil;

e. last pitch coil insertion: performing coil inserting operation on the coil with the last pitch in the reserved space;

f. the first pitch coil is reset: and c, heating the coil with the first pitch again according to the mode of the step c, putting down the coil, and slowly cooling and re-hardening the lower layer edge in the stator slot until the wire embedding operation of the whole coil is completed.

2. The motor high-voltage coil inserting method as claimed in claim 1, wherein: and the temperature measuring instrument in the step b is an infrared temperature measuring instrument.

3. The motor high-voltage coil inserting method as claimed in claim 1, wherein: and c, when the coil is electrified by using the voltage regulator in the step c, the current is introduced to be 2 times of the rated current of the coil, and the voltage is controlled within 100V.

4. The motor high-voltage coil inserting method as claimed in claim 1, wherein: in step c, when the surface temperature of the linear part of the coil reaches 80 +/-2 ℃, the power supply can be turned off.

5. The motor high-voltage coil inserting method as claimed in claim 1, wherein: and d, the special lifting rope in the step d is a polyester rope.

6. The motor high-voltage coil inserting method as claimed in claim 1, wherein: in the steps c and d, the coils are heated one by one according to the sequence of the heights of the hanging handles from low to high, then the hanging handles are carried out one by one, the coils after the hanging handles are completed are uniformly and closely leaned together, and the heights are gradually increased until the completion.

7. The motor high-voltage coil inserting method as claimed in claim 1, wherein: and e, when the coil with the last pitch is embedded in the step e, the coils with the pitch are heated one by one in the same way as the step c and then embedded into the stator slots.

Technical Field

The invention relates to the technical field of motor maintenance, in particular to a motor high-voltage coil inserting method.

Background

At present, in order to improve the yield of many factories, a high-voltage motor is often required to run in an overload mode, and the service life of the motor is correspondingly shortened. The motor maintenance quality requirements of various factories and mines are higher and higher, and the maintenance period requirements are shorter and shorter. Motor manufacturers are saturated in the design of the high-voltage motor in terms of the slot filling rate, the unilateral insulation thickness of the coil and the like, and basically have no design margin. The high-voltage motor which enters the factory for overhaul (overhaul) generally has short service life, and the continuous quality guarantee period of the individual motor is not reached. The high-voltage motor overhaul has the characteristics of complex process, difficult quality control and long overhaul period.

Coil insertion is an important process for high voltage motor repair. The linear part of the coil before wire embedding is molded by hot-state compression molding. The end (bevel edge) close to the straight line is also in a semi-curing state, so that the wire embedding work is extremely difficult, particularly, the last hanging handle part is constructed by adopting a normal-temperature hanging handle, the coil insulation is extremely easy to damage in the wire embedding process, and the ground fault is frequently generated at the stage. Therefore, there is a need to develop a wire inserting method that can prevent damage to the coil insulation during the wire inserting process.

Disclosure of Invention

In order to overcome the defects that the insulating layer of the coil is easy to damage by the existing coil inserting method, the ground short circuit fault of the motor coil is caused, and the like, the technical problems to be solved by the invention are as follows: a wire-inserting method capable of improving efficiency and quality of wire-inserting operation is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the motor high-voltage coil wire inserting method comprises the following steps:

a. conventional wire embedding: performing coil inserting operation on the coil before the last pitch by using a conventional method;

b. preparation work: preparing a voltage regulator, a cable and a temperature measuring instrument;

c. heating the first pitch coil: firstly, connecting a wire inlet head and a wire outlet head of a coil in a first pitch with a voltage regulator by using a cable, then switching on a power supply of the voltage regulator to heat the coil, detecting the surface temperature of the linear part of the coil by using a thermodetector, and when the temperature reaches above 80 ℃, switching off the power supply and disconnecting the connecting cable;

d. thermal state hanging handle: a special lifting rope is sleeved at a turning position of a straight line section of the upper layer side of the coil and the inclined edge of the end part, and the special lifting rope is pulled upwards to enable the coil to rotate around the lower layer side, so that the upper layer side of the coil is lifted to a preset height, and a space is reserved for the coil inserting of the last pitch coil;

e. last pitch coil insertion: performing coil inserting operation on the coil with the last pitch in the reserved space;

f. the first pitch coil is reset: and c, heating the coil with the first pitch again according to the mode of the step c, putting down the coil, and slowly cooling and re-hardening the lower layer edge in the stator slot until the wire embedding operation of the whole coil is completed.

Further, the thermometer in the step b is an infrared thermometer.

Furthermore, when the coil is electrified by using the voltage regulator in the step c, the current is introduced to be 2 times of the rated current of the coil, and the voltage is controlled within 100V.

Further, in step c, when the surface temperature of the linear part of the coil reaches 80 ± 2 ℃, the power supply can be turned off.

Further, the special lifting rope in the step d is a polyester rope.

Further, in the steps c and d, the coils are heated one by one according to the sequence of the height of the hanging handle from low to high, then the hanging handle is carried out one by one, the coils after the hanging handle is finished are uniformly and closely leaned together, and the height is gradually increased until the completion.

Furthermore, when the coil with the last pitch is embedded in the step e, the coils with the pitch are sequentially heated in the same manner as the step c and then embedded into the stator slots.

The invention has the beneficial effects that: the voltage regulator is utilized to introduce low-voltage large current to the coil, the coil is heated, an insulating layer on the surface of the coil is softened, the in-process extrusion damage of a lifting rope and the insulating layer can be avoided, the coil is conveniently rotated and moved, meanwhile, the phenomenon that torsion damage occurs between a coil straight line section and a stator slot can be prevented, the coil inserting operation of the last pitch coil can be facilitated, the labor intensity is reduced, and the efficiency and the quality of the whole coil inserting operation are improved.

Detailed Description

The present invention is further described below.

The invention discloses a motor high-voltage coil inserting method, which comprises the following steps:

a. conventional wire embedding: performing coil inserting operation on the coil before the last pitch by using a conventional method;

b. preparation work: preparing a voltage regulator, a cable and a temperature measuring instrument;

c. heating the first pitch coil: firstly, connecting a wire inlet head and a wire outlet head of a coil in a first pitch with a voltage regulator by using a cable, then switching on a power supply of the voltage regulator to heat the coil, detecting the surface temperature of the linear part of the coil by using a thermodetector, and when the temperature reaches above 80 ℃, switching off the power supply and disconnecting the connecting cable;

d. thermal state hanging handle: a special lifting rope is sleeved at a turning position of a straight line section of the upper layer side of the coil and the inclined edge of the end part, and the special lifting rope is pulled upwards to enable the coil to rotate around the lower layer side, so that the upper layer side of the coil is lifted to a preset height, and a space is reserved for the coil inserting of the last pitch coil;

e. last pitch coil insertion: performing coil inserting operation on the coil with the last pitch in the reserved space;

f. the first pitch coil is reset: and c, heating the coil with the first pitch again according to the mode of the step c, putting down the coil, and slowly cooling and re-hardening the lower layer edge in the stator slot until the wire embedding operation of the whole coil is completed.

The stator part of the motor mainly comprises a shell, a stator in the shell and coils embedded in stator slots, wherein the coils are arranged according to a plurality of pitches, and each pitch comprises a plurality of coils. In the coil-inserting operation, the lower side of each coil is inserted into the stator slot, and the upper sides are inclined to each other.

Due to the special oblique arrangement of the coils, little operating space is often left when the coil is inserted to the last pitch. Because the linear part of the coil which is embedded is molded and solidified by hot die pressing, the end part (bevel edge) close to the linear part is also in a semi-solidified state, the shape of the coil and the inclination angle of the linear part cannot be adjusted, the pitch of the stator coil of the motor is large, and the mutual interference between the coils is more, so that the situations of stiffness and extrusion of the coil are serious in the process of embedding the coil into the wire slot. Therefore, the upper side of the coil of the first pitch must be lifted one by one with a lifting rope to embed the lower side of the coil of the last pitch, a process also called lifting handle. And the insulating layer of the coil is easy to damage due to extrusion friction of the lifting rope and torsion damage of the lifting rope and the stator slot in the process of lifting the handle.

The key process of the scheme provided by the invention is that the insulating layer of the coil is softened firstly, then the hanging handle and the wire embedding with the final pitch are carried out, the whole process is carried out when the insulating layer is in a hot state, and the insulating layer damage caused by rigid impact can be avoided.

In order to improve the heating efficiency of the coil, when the coil is electrified by the voltage regulator, the current is preferably 2 times of the rated current of the coil, the voltage is controlled within 100V, and the temperature of the coil can be rapidly increased. For the convenience of checking the temperature, the thermometer is preferably an infrared thermometer. In the heating process, the temperature is moderate, too high can cause coil turn-to-turn insulation damage, too low can cause the insulating layer to have insufficient flexibility to cause wire embedding difficulty, and according to the test, the surface temperature of the linear part of the coil is controlled to be more suitable at 80 +/-2 ℃.

When the lifting handle is used, the polyester rope is preferably used as a lifting rope, so that the high-temperature-resistant and high-flexibility lifting handle can resist high temperature. When the handle is hung, operators at the head end and the tail end of the coil need to exert force uniformly at the same time, the coil cannot be dragged violently, the height of the handle is proper, so that the coil can be embedded into the lower layer edge, the coil is too high to be hung, the insulation of the coil is easy to damage, the hanging height is not enough, the lower layer edge of the coil at the last pitch cannot enter the groove, and the wire cannot be embedded. The lifting handle heats the coils one by one according to the sequence of the height of the lifting handle from low to high, and then heats the coils one by one, and the coils finished by the lifting handle are uniformly and tightly close to each other, and the height of the coils is gradually increased until the coils are finished.

When the coil of the last pitch is inserted, the inserting space of the coil becomes narrow and the operation is limited due to the hanging handle. In order to ensure the coil inserting quality, the coil can be inserted after the coil is heated outside the slot in the same method. And finally, the lifted coils with the first pitch are heated one by one and then embedded into the groove. Because the binding workload is very large when the winding is formed and inserted, in order to find out the coils with damaged insulation in time and prevent large rework, a staged voltage-withstand test can be carried out once after a plurality of coils are embedded, and after all inserted wires are finished, the voltage-withstand test is carried out on all the coils.

By adopting the thermal state handle-hanging operation method, the coil inserting of the high-voltage coil is relatively easy, the coil inserting quality is improved, the maintenance quality of the whole high-voltage motor is greatly promoted, the 100 percent qualification of the coil inserting of the handle-hanging is realized, a large amount of coil inserting time is saved, the labor intensity is reduced, the coil inserting efficiency is improved by nearly 30 percent, and the thermal state handle-hanging operation method has good economic value and social value and wide application prospect.