CN111669021B - Installation method of large single-bearing brushless excitation synchronous motor - Google Patents
Installation method of large single-bearing brushless excitation synchronous motor Download PDFInfo
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- CN111669021B CN111669021B CN202010519470.4A CN202010519470A CN111669021B CN 111669021 B CN111669021 B CN 111669021B CN 202010519470 A CN202010519470 A CN 202010519470A CN 111669021 B CN111669021 B CN 111669021B
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Abstract
The invention relates to a method for installing a large single-bearing brushless excitation synchronous motor, wherein the motor is installed after a compressor is installed, a motor rotor and an exciter are firstly detached from a base, the base is installed in place through a reserved hole in a factory building roof, and a temporary support carrier roller is installed at the lower part of the non-bearing end of the motor rotor; the rotor shaft passes through the stator and is initially aligned and falls down; hoisting the rotor and the stator, and placing the stator on the base through a reserved hole in the roof of the plant; aligning and adjusting an air gap between a rotor and a stator by the motor, and installing an exciter and adjusting the air gap; primarily centering a compressor and a motor coupler, secondarily grouting the compressor, grouting a foundation bolt hole of a motor base, and fastening a foundation bolt of the compressor; after the compressor and the motor coupler are accurately centered, secondary grouting is performed on the motor base, and foundation bolts of the motor base are fastened; the temporary supporting carrier roller for supporting the rotor is dismantled, the stator and the base are fastened after the temporary supporting carrier roller is inspected to be qualified, and the installation is completed.
Description
Technical Field
The invention relates to an installation construction method of a compressor and a driving motor, in particular to an installation method of a large single-bearing brushless excitation synchronous motor.
Background
The hydrocracking device of the PMB petrochemical engineering project is provided with a plurality of new hydrogen compressors, the model is a large reciprocating compressor, the large reciprocating compressor is driven by a large single-bearing brushless excitation synchronous motor, and the large reciprocating compressor is widely applied to the petrochemical engineering project, is mainly used for compressing gas and improving gas pressure, is beneficial to various chemical reactions, and is core equipment of the petrochemical engineering project.
The existing installation construction method only aims at the motor with a double-bearing structure, most of the motor is supplied integrally, even if the large motor is loaded in bulk, the compressor and the motor are respectively assembled and then centered, and the installation is simpler. The hydrocracking device for the PMB petrochemical project adopts a large single-bearing synchronous motor, and is bulk delivery, and the delivery condition is as follows: the stators are packaged separately; the rotor and the exciter are temporarily installed on the motor base and packaged together, the main junction box and the transition seat are packaged together, coordination needs to be carried out with compressor installation in the motor installation process, the construction difficulty is increased, and the construction procedure is different from that of double-bearing motor installation. Therefore, there is a need for a new mounting method suitable for single-bearing brushless excitation synchronous machines.
Disclosure of Invention
The invention aims to solve the technical problem of providing an installation method of a large single-bearing brushless excitation synchronous motor, so as to meet the requirement of a single-bearing structure motor in a bulk delivery state.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for installing a large single-bearing brushless excitation synchronous motor comprises the following steps:
step one, a compressor is installed in place;
step two, starting to install the motor after the compressor is installed, firstly detaching the motor rotor and the exciter from the base, installing the base in place through a reserved hole in the roof of the factory building, and installing a temporary supporting roller for supporting the non-bearing end of the rotor at the lower part of the non-bearing end of the motor rotor;
thirdly, hoisting the motor stator to a steel platform on site, hoisting the rotor by using a crane, penetrating a rotor shaft through the stator, and primarily aligning and dropping the rotor shaft;
hoisting the rotor and the stator, and placing the stator on the base through a reserved hole in the roof of the plant;
step five, aligning and adjusting an air gap between the rotor and the stator by the motor, and installing an exciter and adjusting the air gap;
after the air gap is adjusted, screwing each connecting bolt, and placing the motor rotor at the magnetic center position to enable the magnetic center lines of the motor stator and the motor rotor to be aligned with each other;
step seven, preliminarily centering the compressor and the motor coupler, measuring the crank arm distance difference of the crankshaft of the compressor, secondarily grouting the compressor, grouting a foundation bolt hole of the motor base, and fastening a foundation bolt of the compressor;
step eight, measuring the crank arm distance difference of the crankshaft of the compressor again, and accurately centering the compressor and the motor coupler;
step nine, mounting a flywheel and a turning gear, then performing secondary grouting on the motor base, and fastening foundation bolts of the motor base;
and step ten, dismantling the temporary support carrier roller for supporting the rotor, measuring the crank arm distance difference of the compressor crankshaft for the third time, checking the air gap between the electronic rotor and the stator again, and fastening the stator and the base after the air gap is qualified to finish the installation.
Further, in the second step, the temporary support carrier roller comprises a support, a carrier roller and carrier roller shafts, the support is connected with the stator base, the two carrier roller shafts penetrate through the top of the support in parallel, each carrier roller shaft is provided with a rotatable carrier roller, and the non-bearing end of the motor rotor is supported between the upper gaps of the two carrier rollers.
Furthermore, in the third step, a side plate of the stator shell is detached, the rotor is lifted by a crane, the rotor shaft penetrates through the stator, the positions of the lifting belts need to be changed once in the process, the two lifting belts are positioned at two sides of the stator, and when the rotor falls down, a polytetrafluoroethylene plate or a rubber plate is padded on the contact surface of the rotor and the steel plate; and hoisting the rotor again, penetrating the rotor into the stator, primarily aligning and falling down, and padding a polytetrafluoroethylene plate or a rubber plate between the rotor and the stator.
Further, in step four, install the first curb plate of stator shell, lift rotor and stator with the crane, use the compensating beam during hoist and mount, hang two back chains on the compensating beam, hoist and mount area and back chain are tied simultaneously on rotor and stator, adjust the back chain and do not make rotor extrusion stator when lifting rotor and stator, adjust rotor levelness simultaneously and meet the requirements, then lay rotor and stator on motor base through factory building roof preformed hole, add the adjustment shim pack that thickness is 2 ~ 4mm between motor base and stator frame, bearing frame, fastening bolt is fixed stator and motor base.
Further, in step five, the method for inspecting the air gap includes: (1) finding the maximum radius point B of the rotor: taking a point A as a measuring point on the stator, numbering the magnetic poles of the rotor in sequence, making a reliable mark, turning the rotor by a jigger, respectively measuring the distance from the point A to each magnetic pole of the rotor along the radial direction and recording the distance, wherein the point with the minimum distance from the point A on the rotor is a point B; (2) checking the air gap of the motor, dividing the stator into eight parts and taking 10 points, taking the point B on the rotor as a measuring point, turning to check the gap between the point B and the 10 points on the stator, and recording; the difference between the maximum and minimum gaps and the average gap should be less than 5% of the average gap.
Further, in the seventh step and the eighth step, the coaxiality alignment of the compressor crankshaft and the motor spindle takes the compressor crankshaft as a reference, and the alignment of the compressor and the motor coupling includes parallel alignment and angle alignment.
Further, in the seventh step, after the primary centering is completed, the compressor crankshaft is placed at four positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees, the throw distance difference of the crankshafts is measured to be less than 0.03mm, secondary grouting is performed on the compressor crankshaft and grouting is performed on the motor anchor bolt holes after the crankshafts are qualified, and the compressor anchor bolts are fastened after secondary grouting maintenance is performed on the compressor crankshaft.
Further, in the ninth step, after the accurate centering is finished, a flywheel and a turning gear are installed, and a coupling is tightly screwed by a bolt, so that the crankshaft of the compressor and the rotor of the motor form a rigid whole; and (3) placing the crankshaft of the compressor at four positions of 0 degree, 90 degrees, 180 degrees and 270 degrees, respectively measuring the distances between the crank throws of the crankshaft to be less than 0.03mm, performing secondary grouting on the motor after the crankshaft is qualified, and immediately fastening foundation bolts of a motor base after the secondary grouting maintenance time is up.
Compared with the prior art, the invention provides a novel assembly procedure of a large single-bearing brushless excitation synchronous motor, and a rotor at the end without a bearing of the motor is supported by adopting a temporary support carrier roller so as to ensure the stability of the motor rotor in the hoisting and mounting processes. When the motor rotor is aligned with a crankshaft of the compressor, the rotor needs to be rotated, the shaft alignment requirement precision is high, the radial deviation is less than 0.02mm, the axial deviation is less than 0.02/1000, and the temporary support carrier roller is adopted to support the rotor, so that the alignment precision is improved.
Adjusting the air gap between the stator and the rotor of the motor for the second time; measuring the crank arm distance difference of the crankshaft of the compressor for the second time; and (4) checking the air gap between the stator and the rotor of the motor for the second time after the temporary support carrier roller of the motor is removed, and measuring the crank arm distance difference of the crankshaft of the compressor for the third time. Fastening motor rag bolt and demolising the interim supporting roller of motor, motor base or rotor can have little displacement, and compressor crankshaft crank arm apart from the difference also can surpass the deviation of design requirement, consequently need detect once more, if surpass the deviation value of design requirement, must adjust to guarantee the installation accuracy. The mounting method provided by the invention is particularly suitable for mounting the single-bearing brushless excitation synchronous motor which is loaded in bulk, and can improve the mounting efficiency and ensure the mounting precision.
Drawings
FIG. 1 is an installation process for the method of the present invention.
Figure 2 is a schematic view of the compressor train arrangement of the present invention.
Fig. 3 and 4 are schematic views of the assembly structure of the single-bearing brushless excitation synchronous motor according to the invention.
Fig. 5 is a schematic view of the structure of the inventive rotor support.
Fig. 6 and 7 are schematic structural views of the temporary support idler.
In the figure, 1-rotor, 2-stator temperature measuring junction box, 3-main machine heater junction box 4-stator, 5-cooler, 6-sliding bearing, 7-ventilation pipe, 8-exciter junction box, 9-exciter, 10-exciter heater junction box, 11-positive pressure protection system control unit, 12-water leakage detector, 13-chassis, 14-differential protection junction box, 15-main power supply junction box, 16-rotor bracket, 17-support, 18-carrier roller, 19-carrier roller shaft, 20-motor rotor bearingless end, 21-cushion block, 22-bolt, 23-compressor, and 24-thin gasket.
Detailed Description
The large single-bearing synchronous motor for the embodiment is loaded in bulk, and the stator is packaged independently; the rotor and the exciter are temporarily installed on the motor base and packaged together, and the main junction box and the transition seat are packaged together. The motor installation process needs to be coordinated with the compressor installation, so that the construction difficulty is increased, and the construction procedure is different from the double-bearing motor installation.
In the present embodiment, the compressor is manufactured by DRESSER-RAND corporation, the motor is a large single-bearing brushless excitation synchronous motor manufactured by goos motors, the compressor and the main motor are coupled by a rigid coupling, so that the motor rotor and the compressor crankshaft are rigidly integrated, and the arrangement diagram of the compressor set is shown in fig. 1. The motor model is TZYW7350-20/3250WF1, the rated power is 7350kW, the rated voltage is 10kV, and the motor consists of a rotating rectifier, an alternating current exciter, a main motor and a positive voltage protection system. The motor adopts a single-support bearing bush structure, and a shaft current prevention measure and a bearing bush are adopted at the tail end of the motor; the whole machine is a brushless excitation structure, an excitation cabinet supplies AC power frequency three-phase voltage to an exciter, three-phase voltage is induced on an armature, direct current is output to a rotor to generate a magnetic field through full-wave rectification, the magnetic field is matched with a magnetic field generated by 10 kilovolt voltage of a stator, and the magnetic poles are automatically aligned to meet the requirement of synchronization. The motor has the appearance shown in fig. 3 and 4.
The method is characterized in that base acceptance is firstly carried out before the compressor and the motor are installed, and the base strength and the base surface quality are mainly checked. The surface of the foundation needs to be free of cracks, bubbles, exposed steel bars and external defects; the cement is beaten by a steel hammer in all aspects of the foundation, the sound is clear and crisp, the sound is not dull, the sound is not appropriate, and the cement is not collapsed or scattered after trial drilling and inspection; checking the correctness of the center line of the foundation, the arrangement position, the size and the depth of the foundation bolt hole, whether the hole is clean or not, and whether the height of the foundation, the levelness of the top surface, the size of a pit for installing a stator and the like are correct or not; the surface for placing the sizing block needs to be shoveled flat, and the surface for secondary grouting of the foundation needs to be shoveled to form a pitted surface.
The hoisting capacity of the bridge crane in the compression plant is generally designed according to the hoisting maximum maintenance part, and the machine body, the motor stator and the rotor of the large-scale compressor unit are hoisted, so that the machine body and the motor of the compressor unit need to be hoisted to the foundation by the large-scale crane before the compression plant is closed and then installed.
Referring to fig. 1, the installation method of the large single-bearing brushless excitation synchronous motor provided by the invention comprises the following steps.
Step one, the compressor is installed in place. Firstly, a compressor is installed, the compressor is in place, leveled and aligned, and the parts are installed.
And step two, starting to install the motor after the compressor is installed, firstly detaching the motor rotor and the exciter from the base, installing the base in place through a reserved hole in the roof of the factory building, and installing a temporary supporting roller for supporting the non-bearing end of the rotor at the lower part of the non-bearing end of the motor rotor.
Relatively specifically, a base, a stator, a rotor and the like of the motor need to be hoisted in place from a preformed hole in the top of a compressor factory building by using a crane, and the motor is properly and safely protected against parts which are easy to collide in the whole installation process; the motor is provided with a hoisting device for transportation, the hoisting device on the motor base is used for transporting a lifting hook and a sling, and the impact and the collision of a shaft, a coupling and a bearing part are avoided so as to avoid damaging the bearing. Before hoisting, the weight of the motor is noticed, the actual weight of the motor is indicated in the motor name plate, and the sling is tensioned to avoid jerking or sudden movement of the motor.
And a steel plate platform is laid for conveniently placing the stator. Referring to fig. 5, a rotor support 16 for temporarily placing a rotor is manufactured, the rotor support 16 includes a bottom support frame and V-shaped supports fixed at two ends of the top of the bottom support frame, the rotor support 16 is stably placed, and a rotor shaft is placed in the two V-shaped supports. Transporting the motor stator, rotor and other components to the site, and placing sleepers under all wooden boxes or parts; the equipment is unpacked, checked and installed and the professional of the electrical instrument participates in the process at the same time; after unpacking, the installed or uninstalled parts are covered tightly by the three-proofing cloth and cannot be wetted by rainwater.
The motor rotor and the base box are disassembled, the rotor and the exciter are fixed on the base, the upper half part of a motor bearing and the exciter are disassembled, and then the rotor is disassembled and hung on the rotor support.
Dismantle the base bottom interim steelframe and abandon usefulness, hoist the motor base with the crane, must make level the motor base during hoist and mount, then wear rag bolt, through compressor factory building roof preformed hole, hoist the base on motor basis. Placing iron pad groups with inclined iron pads on a base, wherein each iron pad group is not more than four, the number of the iron pad groups is not too small, and the iron pad groups are placed at a position close to each foundation hole and a position with concentrated load and are placed as far as possible below a supporting piece of a motor bottom plate; firstly, hoisting a base of a motor onto an iron pad, aligning and leveling the base of the motor, wherein the levelness deviation of the base of the motor is less than 0.1mm/m, and the deviation of the base of the motor relative to the central position of a machine body is less than 0.5 mm; an insulating gasket is additionally arranged between the bearing seat and the base, and insulating measures are also needed for bolts, positioning pins and the like, so that induced current is prevented from passing through the bearing and damaging an oil film.
As shown in fig. 6 and 7, the temporary rotor supporting idler is installed at the non-bearing end of the rotor, and comprises a support 17, an idler 18 and idler shafts 19, the support 17 is connected with a stator base, the two idler shafts 18 penetrate through the top of the support 17 in parallel, each idler shaft 19 is provided with a rotatable idler 18, and the non-bearing end 20 of the motor rotor is supported between the upper gaps of the two idler shafts 18. A cushion block 21 is arranged between the support 17 and the stator base, and the support 17, the stator base and the cushion block are connected through a bolt 22. When the motor rotor is aligned with a compressor crankshaft, the rotor needs to be rotated, the shaft alignment requirement precision is high, the radial deviation is less than 0.02mm, and the axial deviation is less than 0.02/1000. The temporary support carrier roller has enough rigidity and is required to rotate stably, and a rolling bearing is arranged in the carrier roller.
And step three, hoisting the motor stator to a steel platform on site, hoisting the rotor by using a crane, penetrating the rotor shaft through the stator, and primarily aligning and falling. Specifically, after a stator side plate is removed, a crane is used for lifting the rotor, a rotor shaft penetrates through the stator, the position of a rope needs to be changed once in the process, two lifting belts are located on two sides of the stator, and when the rotor falls down, a polytetrafluoroethylene plate or a rubber plate needs to be padded on the contact surface of the rotor and a steel plate; and hoisting the rotor again, slowly penetrating the rotor into the stator, primarily aligning and falling down, and filling a polytetrafluoroethylene plate or a rubber plate between the rotor and the stator so as to avoid loss of the motor, wherein finally the rotor penetrates into the stator.
And step four, hoisting the rotor and the stator, and placing the stator on the base through a reserved hole in the roof of the workshop. Install stator housing second curb plate, hoist rotor and stator with the crane, use the compensating beam during hoist and mount, hang two backbones on the compensating beam, hoist and mount area and backbones are tied simultaneously on rotor and stator, adjust the backbones and do not make rotor extrusion stator when hoisting rotor and stator, adjust rotor levelness meet the requirements simultaneously, then lay rotor and stator on motor base through factory building roof preformed hole, at motor base and stator frame, add the adjustment shim pack that thickness is 2 ~ 4mm between the bearing frame, fastening bolt is fixed stator and motor base.
And fifthly, aligning and adjusting the air gap between the rotor and the stator by the motor, and installing an exciter and adjusting the air gap.
Firstly, checking and verifying the motor to be correct; the motor level is preliminarily adjusted by using a jackscrew and a sizing block, the levelness deviation of a motor base is less than 0.10 mm/m, the levelness deviation of the motor base is less than 0.50mm relative to the central position of a machine body, and then a motor bearing and a temporary support carrier roller are inspected.
The barring inspection motor and exciter air gap, the inspection method of the air gap comprises the following steps: (1) finding the maximum radius point B of the rotor: taking a point A as a measuring point on the stator, numbering the magnetic poles of the rotor in sequence, making a reliable mark, turning the rotor by a jigger, respectively measuring the distance from the point A to each magnetic pole of the rotor along the radial direction and recording the distance, wherein the point with the minimum distance from the point A on the rotor is a point B; (2) checking the air gap of the motor, dividing the stator into eight parts and taking 10 points, taking the point B on the rotor as a measuring point, turning to check the gap between the point B and the 10 points on the stator, and recording; the difference between the maximum and minimum gaps and the average gap should be less than 5% of the average gap.
The adjustment of the air gap between the stator and the rotor of the motor is completed by increasing or decreasing the thin gaskets 24 between the motor and the base; the distance difference of the crank arms of the compressor crankshaft is completed by increasing or decreasing the thin gasket 24 between the motor bearing seat and the motor base; exciter air gap adjustment is also accomplished by increasing or decreasing the shims 24 between the exciter stator and the motor base.
And step six, after the air gap is adjusted, screwing each connecting bolt, and placing the motor rotor at the magnetic force center position to enable the magnetic force center lines of the motor stator and the motor rotor to be aligned with each other. Relatively specifically, the rotor of the motor is placed at the magnetic center position, the motor is pre-installed strictly according to the magnetic center data provided on the nameplate, and the axial positioning of the rotor and the stator of the motor is carried out according to the position marked on the motor, so that the magnetic force center lines of the stator and the rotor are aligned with each other.
Step seven, preliminarily centering the compressor and the motor coupler, measuring the crank arm distance difference of the crankshaft of the compressor, secondarily grouting the compressor, grouting a foundation bolt hole of the motor base, and fastening a foundation bolt of the compressor;
the coaxiality alignment of the compressor crankshaft and the motor spindle is realized by taking the compressor crankshaft as a reference and adjusting a sizing block or a jackscrew at the lower part of the motor. Between the motor and the compressor, its drive shaft must be precisely centered. No vibrations, bearing overload and shaft overstress can be caused to the medium. The compressor and motor coupling pairs include parallel pairs and angular pairs. For parallel alignment, a rigid support and a dial indicator are arranged on the compressor coupling, and a measuring head of the dial indicator is arranged on the cylindrical surface of the motor coupling. And simultaneously, rotating the two ends of the transmission shaft to read the readings of the top, the bottom and the two sides. The reading difference between the top and the bottom is read, and the reading difference on the two sides is used as the basis for centering, and the reading difference cannot exceed 0.025mm for the rigid coupling. And for angle alignment, the two shafts of the compressor and the motor are placed at the maximum axial displacement close to each other, and the two shafts are rotated simultaneously to measure the readings of the top, the bottom and the two sides of a measuring point on the end surface of the excircle of the coupler. Two tables are used because of the possibility of axial play. The difference in variation between them is read. When the transmission shaft is centered, the variation range of all the tables cannot exceed 0.05 mm.
The crankshaft of the compressor and the rotor of the motor are connected together through a coupling and are in rigid connection, whether the rotor is stressed uniformly and operates stably needs to check whether the difference of the crank arm distances of the crankshaft exceeds an allowable deviation.
The coupler performs two steps of centering and accurate centering on an initial part in a middle-centering mode, namely primary centering, after the primary centering is completed, the compressor crankshaft is placed at four positions of 0 degree, 90 degrees, 180 degrees and 270 degrees, the crank throw distance difference (the opening value of a circle of an inter-disc between two cranks per throw) is measured to be less than 0.03mm, secondary grouting of the compressor and grouting of a motor foundation bolt hole are performed after the compressor crankshaft is qualified, and the compressor foundation bolt is fastened after the secondary grouting and maintenance time of the compressor is up.
And step eight, measuring the crank arm distance difference of the crankshaft of the compressor again, and accurately centering the compressor and the motor coupler.
Step nine, mounting a flywheel and a turning gear, then performing secondary grouting on the motor base, and fastening foundation bolts of the motor base; after the accurate centering is finished, a flywheel and a turning gear are installed, and a coupling is tightened by a bolt, so that a compressor crankshaft and a motor rotor form a rigid whole; and (3) placing the compressor crankshaft at four positions of 0 degree, 90 degrees, 180 degrees and 270 degrees, respectively measuring the distance difference between the crank throws (the opening value of one circle of the disc between two cranks of each throw) of less than 0.03mm, performing secondary grouting on the motor after the motor is qualified, and immediately fastening the foundation bolt of the motor base after the secondary grouting maintenance time is up.
And step ten, dismantling the temporary support carrier roller for supporting the rotor, measuring the crank arm distance difference of the compressor crankshaft for the third time, checking the air gap between the electronic rotor and the stator again, and fastening the stator and the base after the air gap is qualified to finish the installation.
Claims (6)
1. A method for installing a large single-bearing brushless excitation synchronous motor is characterized by comprising the following steps:
step one, a compressor is installed in place;
step two, starting to install the motor after the compressor is installed, firstly detaching the motor rotor and the exciter from the base, installing the base in place through a reserved hole in the roof of the factory building, and installing a temporary supporting roller for supporting the non-bearing end of the rotor at the lower part of the non-bearing end of the motor rotor;
thirdly, hoisting the motor stator to a steel platform on site, hoisting the rotor by using a crane, penetrating a rotor shaft through the stator, and primarily aligning and dropping the rotor shaft;
hoisting the rotor and the stator, and placing the stator on the base through a reserved hole in the roof of the plant;
step five, aligning and adjusting an air gap between the rotor and the stator by the motor, and installing an exciter and adjusting the air gap;
the air gap inspection method includes: (1) finding the maximum radius point B of the rotor: taking a point A as a measuring point on the stator, numbering the magnetic poles of the rotor in sequence, making a reliable mark, turning the rotor by a jigger, respectively measuring the distance from the point A to each magnetic pole of the rotor along the radial direction and recording the distance, wherein the point with the minimum distance from the point A on the rotor is a point B; (2) checking the air gap of the motor, taking 10 points on the stator, taking the point B on the rotor as a measuring point, turning to check the gap between the point B and each of the 10 points on the stator, recording, and recording that the difference between the maximum and minimum gaps and the average gap is less than 5 percent of the average gap, wherein the average gap is the average value of the recorded gaps;
after the air gap is adjusted, screwing each connecting bolt, and placing the motor rotor at the magnetic center position to enable the magnetic center lines of the motor stator and the motor rotor to be aligned with each other;
step seven, preliminarily centering the compressor and the motor coupler, measuring the crank arm distance difference of the crankshaft of the compressor, secondarily grouting the compressor, grouting a foundation bolt hole of the motor base, and fastening a foundation bolt of the compressor;
in the seventh step, after the preliminary centering is finished, the compressor crankshaft is placed at four positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees, the distance difference between the crankshafts is measured to be less than 0.03mm, the compressor secondary grouting and the motor foundation bolt hole grouting are performed after the crankshafts are qualified, and the compressor foundation bolt is fastened after the compressor secondary grouting maintenance;
step eight, measuring the crank arm distance difference of the crankshaft of the compressor again, and accurately centering the compressor and the motor coupler;
step nine, mounting a flywheel and a turning gear, then performing secondary grouting on the motor base, and fastening foundation bolts of the motor base;
and step ten, dismantling the temporary support carrier roller for supporting the rotor, measuring the crank arm distance difference of the compressor crankshaft for the third time, checking the air gap between the electronic rotor and the stator again, and fastening the stator and the base after the air gap is qualified to finish the installation.
2. The method of claim 1, wherein: and in the second step, the temporary support carrier roller comprises a support, a carrier roller and carrier roller shafts, the support is connected with the stator base, the two carrier roller shafts penetrate through the top of the support in parallel, the rotatable carrier roller is arranged on each carrier roller shaft, and the non-bearing end of the motor rotor is supported between the upper gaps of the two carrier rollers.
3. The method of claim 2, wherein: in the third step, a side plate of a stator shell is detached, the rotor is lifted by a crane, a rotor shaft penetrates through the stator, the positions of the lifting belts need to be changed once in the process, the two lifting belts are positioned at two sides of the stator, and when the rotor falls down, a polytetrafluoroethylene plate or a rubber plate is padded on the contact surface of the rotor and the steel plate; and hoisting the rotor again, penetrating the rotor into the stator, primarily aligning and falling down, and padding a polytetrafluoroethylene plate or a rubber plate between the rotor and the stator.
4. The method as claimed in claim 3, wherein in the fourth step, the lower half side plate of the stator housing is installed, the rotor and the stator are hoisted by a crane, a balance beam is used during hoisting, two inverted chains are hung on the balance beam, a hoisting belt and the inverted chains are simultaneously fastened on the rotor and the stator, the inverted chains are adjusted during hoisting the rotor and the stator so that the rotor does not extrude the stator, the levelness of the rotor is adjusted to meet the requirement, then the rotor and the stator are placed on the motor base through a reserved hole in the roof of the factory building, an adjusting shim group with the thickness of 2-4 mm is added between the motor base and the stator frame and the bearing seat, and the stator and the motor base are fixed by fastening bolts.
5. The method of claim 4, wherein: in the seventh step and the eighth step, the coaxiality alignment of the compressor crankshaft and the motor spindle takes the compressor crankshaft as a reference, and the alignment of the compressor and the motor coupling comprises parallel alignment and angle alignment.
6. The method of claim 5, wherein: step nine, after the accurate centering is finished, installing a flywheel and a turning gear, and tightly fastening a coupling by using a bolt to enable a compressor crankshaft and a motor rotor to form a rigid whole; and (3) placing the crankshaft of the compressor at four positions of 0 degree, 90 degrees, 180 degrees and 270 degrees, respectively measuring the distances between the crank throws of the crankshaft to be less than 0.03mm, performing secondary grouting on the motor after the crankshaft is qualified, and immediately fastening foundation bolts of a motor base after the secondary grouting maintenance time is up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010519470.4A CN111669021B (en) | 2020-06-09 | 2020-06-09 | Installation method of large single-bearing brushless excitation synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010519470.4A CN111669021B (en) | 2020-06-09 | 2020-06-09 | Installation method of large single-bearing brushless excitation synchronous motor |
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| CN111669021A CN111669021A (en) | 2020-09-15 |
| CN111669021B true CN111669021B (en) | 2021-07-13 |
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| CN202010519470.4A Active CN111669021B (en) | 2020-06-09 | 2020-06-09 | Installation method of large single-bearing brushless excitation synchronous motor |
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| JP2019213414A (en) * | 2018-06-07 | 2019-12-12 | 株式会社ミツバ | Rotor assembling apparatus and rotor assembling method |
| CN111106729A (en) * | 2020-01-16 | 2020-05-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Motor stator and rotor countershaft assembly method |
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| JP2008259356A (en) * | 2007-04-06 | 2008-10-23 | Mitsubishi Electric Corp | Device for assembling permanent magnet synchronous motor |
| CN201388127Y (en) * | 2008-12-31 | 2010-01-20 | 中国神华能源股份有限公司 | Withdrawing device of electric motor rotor |
| CN101635488A (en) * | 2009-08-26 | 2010-01-27 | 中冶集团华冶资源开发有限责任公司 | Method for aligning concentricity of exciter rotor and generator rotor of turbogenerator |
| JP2019213414A (en) * | 2018-06-07 | 2019-12-12 | 株式会社ミツバ | Rotor assembling apparatus and rotor assembling method |
| CN111106729A (en) * | 2020-01-16 | 2020-05-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Motor stator and rotor countershaft assembly method |
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