CN107404206A - A kind of coaxial mutually feeding type synchronous motors of 4MW - Google Patents
A kind of coaxial mutually feeding type synchronous motors of 4MW Download PDFInfo
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- CN107404206A CN107404206A CN201710879529.9A CN201710879529A CN107404206A CN 107404206 A CN107404206 A CN 107404206A CN 201710879529 A CN201710879529 A CN 201710879529A CN 107404206 A CN107404206 A CN 107404206A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 59
- 238000004080 punching Methods 0.000 claims abstract description 55
- 238000013016 damping Methods 0.000 claims abstract description 53
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 31
- 238000010030 laminating Methods 0.000 claims description 14
- 238000003475 lamination Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 16
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/26—Rotor cores with slots for windings
- H02K1/265—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a kind of coaxial mutually feeding type synchronous motors of 4MW, for quadrupole three-phase brushless synchronous AC motor and including stator, rotor, exciter and junction box.Stator core is overrided to form by the superpositing unit of multiple stator punchings, stator punching is square, and each superpositing unit is the regular polygon structure being at least formed by stacking by a piece of stator punching after two panels stator punching relative to the mode of one angle [alpha] of preceding a piece of stator punching rotation；Multiple superpositing units laminate into stator core in a manner of the latter superpositing unit deflects an angle beta relative to previous superpositing unit.It is three damping slots that damping slot on rotor punching, which shares three groups every group,.Exciter rotor is arranged on the rotating shaft rear portion for the end plate for stretching out support by the first to the 3rd technique ring flat-plate.12 insulated columns and copper busbar are set in wire box.The coaxial mutually feeding type synchronous motors of MW of the present invention, have filled up the blank of domestic 4MW power sections synchronous generator test unit.
Description
Technical Field
The invention relates to a 4MW coaxial mutual feedback type synchronous motor for a synchronous generator test unit.
Background
At present, a test bed of a synchronous generator with about 4MW does not exist in China, three types of electric generator tests in the power section cannot be tested, firstly, the sudden addition 50% transient voltage adjustment rate of the generator with about 2MW cannot be tested, secondly, the voltage deviation degree is measured under the condition of asymmetric load, namely, the commonly-known unbalance measurement is carried out, and thirdly, the system self-carried vibration test is carried out.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a 4MW coaxial mutual feedback type synchronous generator, which reduces the test cost of the generator, reduces the product cost and fills the blank of a domestic 4MW power section synchronous generator test unit.
The purpose of the invention is realized as follows: a4 MW coaxial mutual-feedback synchronous motor is a four-pole three-phase brushless synchronous alternating current motor and comprises a stator, a rotor, an exciter and a junction box; wherein,
the stator comprises a stator core, a stator winding and a base, wherein the stator core is formed by laminating a plurality of stator punching sheets; the stator punching sheet is square with a round hole in the center, and a plurality of coil slots are uniformly distributed along the circumference of the round hole; four corners of each stator punching sheet are cut off, and then a fixed bar groove is radially formed; the stator core is formed by laminating a plurality of stator punching sheets, and each laminating unit is a regular polygon structure formed by laminating at least two stator punching sheets and a later stator punching sheet which rotate an angle alpha relative to a former stator punching sheet; the plurality of overlapping units are overlapped into a stator core in a mode that the later overlapping unit deflects an angle beta relative to the former overlapping unit so as to enable a coil groove of the stator core to be an inclined groove; the stator winding is embedded in a coil groove of the stator core; the machine base comprises a cylindrical machine shell sleeved outside the stator core, a front end plate and a rear end plate which are arranged at the front end and the rear end of the machine shell in a one-to-one correspondence manner, and a pair of bottom feet arranged on the lower end surface of the machine shell;
the rotor comprises a rotor core formed by laminating a plurality of rotor punching sheets, a plurality of damping rods, two damping plates, a rotor winding and a rotating shaft; each rotor punching sheet is in a disc shape, the center of each rotor punching sheet is provided with a shaft hole, the outer end of each rotor punching sheet is uniformly provided with four notches, a magnetic pole section is formed between every two adjacent notches, and the outer edge of each magnetic pole section is provided with a plurality of damping grooves; the plurality of damping rods are respectively arranged in the corresponding damping grooves on all the rotor punching sheets in series, and the plurality of rotor punching sheets in series with the damping rods are laminated into a salient pole type rotor iron core with four magnetic poles; the two damping plates are respectively arranged at two ends of the rotor core and are connected with two ends of all the damping rods and then fixed with two end faces of a magnet yoke of the rotor core in a spot welding manner, so that the plurality of damping rods and the two damping plates form a squirrel-cage damping winding; the rotor winding is sleeved on the pole body of each magnetic pole; the diameter of the middle part of the rotating shaft is matched with the diameter of a shaft hole of the rotor punching sheet, and a key groove is axially formed, so that a rotor iron core is sleeved in the middle part of the rotating shaft through the key groove;
the exciter comprises an exciter stator and an exciter rotor; the exciter rotor is arranged at the rear part of a rotating shaft of a rear end plate extending out of the base through first to third process ring plates; the inner diameters of the first to third process ring plates are matched with the inner diameter of an exciter rotor; four countersunk through holes are uniformly distributed on the front end surface of the first process ring plate, the first process ring plate is correspondingly arranged in the four countersunk through holes one by one, penetrates through outer hexagon bolts of the exciter rotor and is fixed on the front end surface of the exciter rotor through four nuts; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly distributed on the rear end surface of the second process annular plate; the third process ring plate is an open ring, a V-shaped groove is formed in the outer peripheral surface close to one open end, a countersunk hole which is communicated with the end surface of the open end and used for mounting a tightening screw is formed in one side surface of the V-shaped groove, and a threaded blind hole is correspondingly formed in the end surface of the other open end; five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process annular plate and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process annular plate are formed on the end surface of the third process annular plate, so that the second process annular plate and the third process annular plate are connected into a whole through five hexagon socket head bolts which are arranged in the five countersunk through holes on the second process annular plate in one-to-one correspondence; the exciter rotor and the first process annular plate sequentially penetrate through six through holes correspondingly formed in the exciter rotor and the first process annular plate one by one and then are screwed into the threaded through hole in the second process annular plate to be connected with the second process annular plate and the third process annular plate through six long bolts; after the exciter rotor and the first to third process ring plates are sleeved on the rotating shaft together, the first process ring plate is axially locked through a clamp spring arranged on the rotating shaft and is radially held on the rotating shaft through a clamping screw on the third process ring plate;
the wiring box is characterized in that the wiring box is a rectangular box body with an open bottom and is formed by a front wall, a rear wall, a left wall, a right wall and a top wall, the bottom surfaces of the front wall and the rear wall of the wiring box are both arc-shaped and matched with the upper end of the casing, so that the wiring box is installed on the upper end surface of the casing, three wiring racks which are positioned on the same horizontal plane and uniformly cross the left wall and the right wall at intervals and four supporting frames which are positioned on the same horizontal plane above the three wiring racks and cross the front wall and the rear wall are arranged in the wiring box, three insulating binding posts which are in one-to-one correspondence with the three wiring racks are installed on each supporting frame, and a wiring copper; twelve wire outlet holes corresponding to the twelve wiring copper bars are formed in the top wall.
In the above 4MW coaxial mutual-feeding synchronous motor, a plurality of ventilation holes are symmetrically formed on the stator punching sheet at both sides of each fixed rod groove.
In the 4MW coaxial mutual-feedback synchronous motor, the damping slots on the magnetic pole section of the rotor sheet are three groups of three damping slots, one group of damping slots is arranged in the middle of the pole shoe of the magnetic pole section, the other two groups of damping slots are symmetrically arranged on two sides of the pole shoe and are respectively spaced by 9 degrees from the middle group of damping slots, and the pitch angle of the same group of damping slots is 6 degrees.
In the above 4MW coaxial mutual feedback synchronous motor, the rotor winding is formed by a double-layer hollow winding manner.
In the 4MW coaxial mutual feedback synchronous motor, an annular insulating terminal plate is further mounted at the rear end of the exciter rotor through the six long bolts, and the insulating terminal plate is separated from the exciter rotor by six bushings each mounted on the six long bolts.
The 4MW coaxial mutual feedback type synchronous generator has the following characteristics:
1) the stator punching sheet adopts a square punching sheet, and a regular polygon stator core is formed by a special laminating structure, so that the stator core has an inclined groove and an uneven air gap, not only can the material be saved, but also the stator core has the most excellent performance of a 4MW power section under the same outer diameter and volume;
2) the rotor punching sheet has the most excellent performance of a 4MW power section under the same outer diameter and volume;
3) the rotating shaft adopts a reasonable step type, the FEA second-order frequency meets the requirement that the motor does not generate resonance when in operation, and the strength requirement is met under the maximum impact force in each direction;
4) double-layer permeable windings are adopted at two ends of the rotor winding to increase the heat dissipation of the rotor winding and improve the performance of the rotor;
5) the exciter is arranged outside the base, so that the axial space is reduced, the structural strength is improved, and the subsequent maintenance work is facilitated;
6) twelve insulating columns and wiring copper bars are arranged in the wire outlet box, the electrical distance and the electrical interval which accord with the specification are met, and compared with the wire outlet box in the prior art, the wire outlet box has smaller volume and more excellent insulating property.
In conclusion, the 4MW coaxial mutual feedback type synchronous generator reduces the test cost of the generator, reduces the product cost and fills the blank of the domestic 4MW power section synchronous generator test unit.
Drawings
FIG. 1 is an isometric view of a 4MW coaxial, mutually fed synchronous generator of the present invention;
FIG. 2 is a plan view of a stator lamination of the 4MW coaxial mutual feedback type synchronous generator of the present invention;
FIG. 2a is a front view of the stator core of the 4MW coaxial mutual feedback synchronous generator of the present invention;
FIG. 2b is a side view of the stator core of the 4MW coaxial mutual feedback synchronous generator of the present invention;
FIG. 2c is a view from the direction A of FIG. 2 a;
FIG. 2d is a view from B-B in FIG. 2B;
FIG. 3 is a side view of the rotor of the 4MW coaxial mutual feedback synchronous generator of the present invention;
FIG. 4 is a plan view of a rotor plate of the 4MW coaxial mutual feedback type synchronous generator of the present invention;
FIG. 4a is an isometric view of the rotor core of the 4MW coaxial, mutually fed synchronous generator of the present invention;
FIG. 5a is a front isometric view of the exciter rotor of the 4MW coaxial, mutually fed synchronous generator of the present invention;
FIG. 5b is a rear isometric view of the exciter rotor of the 4MW coaxial, mutually fed synchronous generator of the present invention;
fig. 5c is a front view of the exciter rotor;
FIG. 5d is a view from the direction C-C in FIG. 5C;
fig. 5e is a rear view of the exciter rotor;
FIG. 5f is a view from direction D-D in FIG. 5 e;
fig. 6 is an isometric view of the junction box of the 4MW coaxial mutual feedback synchronous generator of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 6, the 4MW coaxial mutual-feed synchronous motor of the present invention is a four-pole three-phase brushless synchronous ac motor and includes a stator, a rotor, an exciter 7, a junction box 8 and a fan guard 9.
The stator comprises a stator core 10, a stator winding and a base, wherein the stator core 10 is formed by laminating a plurality of stator punching sheets 1; the stator punching sheet 1 is a square with a round hole 11 in the center, and a plurality of coil slots 12 are uniformly distributed along the circumference of the round hole 11; after four corners of each stator punching sheet 1 are cut off, a fixed bar groove 13 is respectively radially formed, the fixed bar groove 13 is sequentially a stepped rectangular groove and an inverted trapezoidal groove from outside to inside in shape, and a plurality of ventilation holes 14 (see fig. 2) are symmetrically formed in two sides of each fixed bar groove 13; the stator core 10 is formed by laminating a plurality of stator punching lamination stacking units, and each stacking unit is a regular polygon structure formed by at least two stator punching laminations and a later stator punching lamination which are overlapped in a mode of rotating an angle alpha relative to a former stator punching lamination; each overlapping unit of the embodiment is a regular dodecagon structure (see fig. 2a) formed by overlapping three stator punching sheets 1 in a manner that a second stator punching sheet rotates 120 degrees relative to a first stator punching sheet, and a third stator punching sheet also rotates 120 degrees relative to the second stator punching sheet; the plurality of overlapping units are overlapped into the stator core 10 in a mode that the later overlapping unit deflects an angle beta relative to the former overlapping unit; two ends of a laminated stator core 10 are respectively provided with a tooth pressing plate 15, the inner bottoms of twelve fixing rod grooves 130 are respectively embedded with a fixing rod 16, an inner rectangular groove of every other fixing rod groove 130 is respectively embedded with an inner fixing lath 17, a front fixing plate 18 and a middle fixing plate and a rear fixing plate 19 with the same structure are embedded in the outer rectangular groove of any five fixing rod grooves 13 of six fixing rod grooves 13 embedded with the fixing laths 17, and the other six fixing rod grooves 13 embedded with the fixing laths 17 are respectively fixed with an outer fixing plate 18' so as to enable a coil groove 120 of the stator core 10 to be inclined by 1.05 grooves (see fig. 2 b-2 d); the stator winding is embedded in the coil slot 120 of the stator core 10; the base comprises a cylindrical casing 20 sleeved outside the stator core 10, a front end plate 21 and a rear end plate 22 which are correspondingly arranged at the front end and the rear end of the casing 20 one by one, a flange ring 23 surrounding the middle part of the casing 20, a plurality of reinforcing ribs 24 axially arranged on the outer surface of the casing 20, and a pair of bottom feet 25 (shown in figure 1) arranged on the lower end surface of the casing 20 and respectively positioned at two sides of the flange ring 23.
The rotor comprises a rotor core 30 formed by laminating a plurality of rotor punching sheets 3, a plurality of damping rods 4, two damping plates 40, a rotor winding and a rotating shaft 6 (see figure 3); each rotor punching sheet 3 is in a disc shape with a shaft hole 31 in the center, four notches are uniformly arranged at the outer ends of the rotor punching sheets, a magnetic pole section 32 is formed between every two adjacent notches, and a plurality of damping grooves 33 are formed in the outer edge of each magnetic pole section 32; the damping grooves of the present embodiment have three groups of three damping grooves 33, one group of damping grooves is arranged in the middle of the pole shoe of the magnetic pole section 32, the other two groups of damping grooves are symmetrically arranged on two sides of the pole shoe and are respectively spaced 9 degrees from the middle group of damping grooves, and the pitch angle of the same group of damping grooves 33 is 6 degrees (see fig. 4); thirty-six damping bars 4 are respectively arranged in series in the corresponding damping slots 33 on all the rotor sheets 3, and the plurality of rotor sheets 3 in which the damping bars 4 are arranged in series are laminated into a salient pole type rotor core 30 with four magnetic poles 320; the two damping plates 40 are respectively arranged at two ends of the rotor core 30, and are connected with two ends of all the damping rods 4 and then fixed with two end faces of a magnetic yoke of the rotor core 30 in a spot welding manner, so that the plurality of damping rods 4 and the two damping plates 40 form a squirrel-cage damping winding; a pair of winding supports 51 are mounted on both ends of the rotor core 30 corresponding to the pole bodies of each magnetic pole 320, respectively, and a winding pin 52 is provided at the outer ends of the pair of winding supports 51, respectively (see fig. 4 a); the rotor winding is sleeved on the pole body of each magnetic pole 320 and is formed in a double-layer permeable winding mode, namely, the inner layer of the elbow section of the rotor winding is permeable to the rotor iron core 30 through the winding support 51, and the middle of the elbow section of the rotor winding is permeable through the winding tool, so that the heat dissipation capacity of the rotor winding is increased, and the performance of the rotor is improved; the length of the middle part of the rotating shaft 6 is matched with the length of the rotor core 30, the diameter of the middle part of the rotating shaft 6 is matched with the diameter of the shaft hole 31 of the rotor punching sheet 3, and a key groove is axially arranged, so that the rotor core 30 is fixedly sleeved in the middle part of the rotating shaft 6 through a key 60.
The exciter 7 includes an exciter stator and an exciter rotor 70. The exciter rotor 70 is installed at the rear of the rotating shaft 6 of the rear end plate 22 extending out of the machine base through the first to third technical ring plates 71 to 73; the inner diameters of the first to third process ring plates 71-73 are matched with the inner diameter of the exciter rotor 70; four countersunk through holes are uniformly formed in the front end surface of the first process ring plate 71, and the first process ring plate 71 is installed in the four countersunk through holes in a one-to-one correspondence manner, penetrates through outer hexagon bolts 74a of the exciter rotor 70 and is fixed on the front end surface of the exciter rotor 70 through four nuts 74 b; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly distributed on the rear end surface of the second process annular plate 72; the third technical ring plate 43 is an open ring, a V-shaped groove 73a is formed on the outer peripheral surface close to one open end, a countersunk hole which is communicated with the open end surface and used for mounting a clamping screw 73b is formed on one side surface of the V-shaped groove 73a, and a threaded blind hole is correspondingly formed on the other open end surface; five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process annular plate 72 and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process annular plate 72 are formed in the end surface of the third process annular plate 73, so that the second process annular plate 72 and the third process annular plate 73 are connected into a whole through five hexagon socket head bolts 75 which are arranged in the five countersunk through holes on the second process annular plate 72 in one-to-one correspondence; the exciter rotor 70 and the first process ring plate 71 sequentially penetrate through six through holes correspondingly formed in the exciter rotor 70 and the first process ring plate 71 one by one, and then are screwed into the threaded through hole in the second process ring plate 72 to be connected with the second process ring plate 72 and the third process ring plate 73 through the long bolts 76; after the exciter rotor 70 and the first to third process ring plates 71-73 are sleeved on the rotating shaft 6 together, the first process ring plate 71 is axially locked through a clamp spring arranged on the rotating shaft 6, so that the exciter rotor 70 is axially positioned, and is radially held on the rotating shaft 6 through a clamping screw on the third process ring plate 73, the exciter rotor 70 is prevented from being separated under high-speed rotation, and the exciter 7 can be maintained by detaching a bolt when maintenance is needed.
The exciter rotor 70 is also provided at its rear end with an annular insulating terminal plate 77 by six long bolts 76, and the insulating terminal plate 77 is separated from the exciter rotor 70 by six bushings 760 each mounted on six long bolts 76, facilitating the wiring of the exciter 7 on this insulating terminal plate 77 (see fig. 5a to 5 f).
The junction box 8 is a rectangular box body with an open bottom formed by a front wall 8a, a rear wall 8b, a left wall 8c, a right wall 8d and a top wall 8f made of SMC composite materials through angle iron 8g, the bottom surfaces of the front wall 8a and the rear wall 8b of the junction box 8 are both arc-shaped and matched with the upper end of the machine shell 20, so that the junction box 8 is installed on the upper end surface of the rear part of the machine shell 20, three wiring racks 81 which are positioned on the same horizontal plane and uniformly crossed on the left wall 8c and the right wall 8d at intervals and four supporting frames 82 which are positioned on the same horizontal plane above the three wiring racks 81 and crossed on the front wall 8a and the rear wall 8b are arranged in the junction box 8, three insulating binding posts 83 which correspond to the three wiring racks 81 one by one are arranged on each supporting frame 82, twelve insulating binding posts 83 are arranged, and a wiring copper bar 84 is arranged at the upper end of; twelve wire outlet holes 80 (see fig. 6) corresponding to the twelve wiring copper bars 84 are formed in the top wall 8 f.
Connected to the main equipment by means of an insulated flexible cable and provided with corresponding protection. Meanwhile, an auxiliary terminal box is arranged beside the outlet box 8 and used for connecting an auxiliary terminal of the mutual feedback motor with measurement and signal output, and data is transmitted to an upper computer in an optical fiber mode, so that the accuracy and reliability of the data are guaranteed.
The invention discloses a 4MW coaxial mutual feed type synchronous motor, which is a three-phase brushless alternating current motor used in a 4MW test unit, is used for carrying out coaxial mutual feed type linkage with the motor of the test unit in the test unit, coaxially generating electric energy for testing the three-phase brushless alternating current generator, removing mechanical loss and transmitting the electric energy to the motor. The principle of the whole test unit feedback system is that a motor in the system drives a generator, electric energy generated by the generator is fed back to a coaxial mutual feed type motor, the energy feedback load test method is adopted, test energy is fed back to the driving end of the generator, only loss of running equipment is drawn to a power grid during test to be used as energy supplement, most of the electric energy comes from feedback of the system, and the efficiency generally reaches 75%.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (5)
1. A4 MW coaxial mutual-feedback synchronous motor is a four-pole three-phase brushless synchronous alternating current motor and comprises a stator, a rotor, an exciter and a junction box; it is characterized in that the preparation method is characterized in that,
the stator comprises a stator core, a stator winding and a base, wherein the stator core is formed by laminating a plurality of stator punching sheets; the stator punching sheet is square with a round hole in the center, and a plurality of coil slots are uniformly distributed along the circumference of the round hole; four corners of each stator punching sheet are cut off, and then a fixed bar groove is radially formed; the stator core is formed by laminating a plurality of stator punching sheets, and each laminating unit is a regular polygon structure formed by laminating at least two stator punching sheets and a later stator punching sheet which rotate an angle alpha relative to a former stator punching sheet; the plurality of overlapping units are overlapped into a stator core in a mode that the later overlapping unit deflects an angle beta relative to the former overlapping unit so as to enable a coil groove of the stator core to be an inclined groove; the stator winding is embedded in a coil groove of the stator core; the machine base comprises a cylindrical machine shell sleeved outside the stator core, a front end plate and a rear end plate which are arranged at the front end and the rear end of the machine shell in a one-to-one correspondence manner, and a pair of bottom feet arranged on the lower end surface of the machine shell;
the rotor comprises a rotor core formed by laminating a plurality of rotor punching sheets, a plurality of damping rods, two damping plates, a rotor winding and a rotating shaft; each rotor punching sheet is in a disc shape, the center of each rotor punching sheet is provided with a shaft hole, the outer end of each rotor punching sheet is uniformly provided with four notches, a magnetic pole section is formed between every two adjacent notches, and the outer edge of each magnetic pole section is provided with a plurality of damping grooves; the plurality of damping rods are respectively arranged in the corresponding damping grooves on all the rotor punching sheets in series, and the plurality of rotor punching sheets in series with the damping rods are laminated into a salient pole type rotor iron core with four magnetic poles; the two damping plates are respectively arranged at two ends of the rotor core and are connected with two ends of all the damping rods and then fixed with two end faces of a magnet yoke of the rotor core in a spot welding manner, so that the plurality of damping rods and the two damping plates form a squirrel-cage damping winding; the rotor winding is sleeved on the pole body of each magnetic pole; the diameter of the middle part of the rotating shaft is matched with the diameter of a shaft hole of the rotor punching sheet, and a key groove is axially formed, so that a rotor iron core is sleeved in the middle part of the rotating shaft through the key groove;
the exciter comprises an exciter stator and an exciter rotor; the exciter rotor is arranged at the rear part of a rotating shaft of a rear end plate extending out of the base through first to third process ring plates; the inner diameters of the first to third process ring plates are matched with the inner diameter of an exciter rotor; four countersunk through holes are uniformly distributed on the front end surface of the first process ring plate, the first process ring plate is correspondingly arranged in the four countersunk through holes one by one, penetrates through outer hexagon bolts of the exciter rotor and is fixed on the front end surface of the exciter rotor through four nuts; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly distributed on the rear end surface of the second process annular plate; the third process ring plate is an open ring, a V-shaped groove is formed in the outer peripheral surface close to one open end, a countersunk hole which is communicated with the end surface of the open end and used for mounting a tightening screw is formed in one side surface of the V-shaped groove, and a threaded blind hole is correspondingly formed in the end surface of the other open end; five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process annular plate and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process annular plate are formed on the end surface of the third process annular plate, so that the second process annular plate and the third process annular plate are connected into a whole through five hexagon socket head bolts which are arranged in the five countersunk through holes on the second process annular plate in one-to-one correspondence; the exciter rotor and the first process annular plate sequentially penetrate through six through holes correspondingly formed in the exciter rotor and the first process annular plate one by one and then are screwed into the threaded through hole in the second process annular plate to be connected with the second process annular plate and the third process annular plate through six long bolts; after the exciter rotor and the first to third process ring plates are sleeved on the rotating shaft together, the first process ring plate is axially locked through a clamp spring arranged on the rotating shaft and is radially held on the rotating shaft through a clamping screw on the third process ring plate;
the wiring box is characterized in that the wiring box is a rectangular box body with an open bottom and is formed by a front wall, a rear wall, a left wall, a right wall and a top wall, the bottom surfaces of the front wall and the rear wall of the wiring box are both arc-shaped and matched with the upper end of the casing, so that the wiring box is installed on the upper end surface of the casing, three wiring racks which are positioned on the same horizontal plane and uniformly cross the left wall and the right wall at intervals and four supporting frames which are positioned on the same horizontal plane above the three wiring racks and cross the front wall and the rear wall are arranged in the wiring box, three insulating binding posts which are in one-to-one correspondence with the three wiring racks are installed on each supporting frame, and a wiring copper; twelve wire outlet holes corresponding to the twelve wiring copper bars are formed in the top wall.
2. The 4MW coaxial mutual feedback synchronous motor according to claim 1, wherein the stator punching sheet is symmetrically provided with a plurality of ventilation holes at both sides of each fixed rod slot.
3. The 4MW coaxial mutual feedback synchronous motor according to claim 1, wherein the damping slots on the pole segments of the rotor lamination are three groups of three damping slots, one group of damping slots is provided in the middle of the pole shoe of the pole segment, the other two groups of damping slots are symmetrically and parallelly provided on both sides of the pole shoe and are respectively spaced 9 ° apart from the middle group of damping slots, and the pitch angle of the same group of damping slots is 6 °.
4. The 4MW coaxial mutual feedback synchronous motor according to claim 1, wherein the rotor winding is formed by double layer hollow winding.
5. The 4MW co-axial mutually-fed synchronous motor according to claim 1, wherein the exciter rotor rear end is further mounted with an annular insulating terminal plate by means of the six long bolts, and the insulating terminal plate is separated from the exciter rotor by means of six bushings each mounted on the six long bolts.
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| CN201710879529.9A CN107404206B (en) | 2017-09-26 | 2017-09-26 | 4MW coaxial mutual feed type synchronous motor |
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| CN201710879529.9A CN107404206B (en) | 2017-09-26 | 2017-09-26 | 4MW coaxial mutual feed type synchronous motor |
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| CN107404206B CN107404206B (en) | 2023-06-20 |
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| CN102710077A (en) * | 2012-06-13 | 2012-10-03 | 中机国际工程设计研究院有限责任公司 | Orthogonal excitation synchronous motor and method for establishing gearbox and traditional synchronous motor test system by using same |
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2017
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| CN1610221A (en) * | 2004-09-10 | 2005-04-27 | 株洲通达铁路机电科技有限公司 | Self-excited brushless type three-phase synchrous power generating machine |
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