CN218040946U - Three-phase asynchronous motor - Google Patents
Three-phase asynchronous motor Download PDFInfo
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- CN218040946U CN218040946U CN202221865210.3U CN202221865210U CN218040946U CN 218040946 U CN218040946 U CN 218040946U CN 202221865210 U CN202221865210 U CN 202221865210U CN 218040946 U CN218040946 U CN 218040946U
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Abstract
The utility model discloses a three-phase asynchronous motor, wherein the stator core adopts H-grade and above insulating material, the length of the single side extending iron core of the insulating material is 5-10 mm longer than that of the conventional design motor, the thickness of the slot insulation is improved by 10-20% compared with the common motor, the wiring position of the coil end part of the stator core is welded by acetylene and adopts high-quality silver-copper welding rod; the stator winding enameled wire uses an anti-corona special enameled wire for a variable frequency motor, and a stator core is subjected to paint dipping and baking treatment by adopting a vacuum pressure process; the sectional area of the groove type of the cast aluminum rotor punching sheet is 115% -130% of the original sectional area, the rotating shaft is pressed into the cast aluminum rotor through a shrink fit process, and the rotor is subjected to dynamic balance check by adopting a G1.0 dynamic balance precision level. The utility model discloses a take and reduce stator and rotor winding calorific capacity and measure such as reinforcing electrical strength and mechanical strength among the motor operation process, improved the reliability that the motor dealt with various operating modes and used.
Description
Technical Field
The utility model belongs to the technical field of the motor is made, concretely relates to three-phase asynchronous motor.
Background
In the use process of the three-phase asynchronous motor, various use working conditions are often met, such as power frequency full-voltage direct start, direct start under full load, frequent start, frequent forward and reverse rotation, short-time overload, short-time overvoltage and the like.
It is known that the starting current of an asynchronous motor is about 5 to 8 times of the rated current, and although the starting time is only 3 to 10 seconds (the starting time is longer as the load is heavier at the starting time), the large starting current generates large impact force on the stator coil of the motor and the rotor cage guide bar, and the large current also generates a large amount of heat.
The damage to the motor under the use working conditions of power frequency full-voltage direct start, direct start under full load, frequent start, frequent forward and reverse rotation, short-time overload, short-time overvoltage and the like is summarized mainly as follows:
(1) overheating the stator winding; as is known, the stator copper loss and the rotor aluminum loss in the motor are in direct proportion to the square of current, the starting current which is 5 to 7 times of rated current enables the heat in the motor to be rapidly increased, and the heat is accumulated continuously until the dangerous edge is reached after the motor is started and stopped repeatedly in a short time.
(2) The rotor squirrel cage conducting bars are damaged or broken; the motor is repeatedly impacted by various inertia forces, centrifugal forces, shearing forces and the like due to frequent start and stop, so that the weakest part of the rotor cage is cracked due to fatigue, the current density at the part is increased, the local part is gradually overheated, the crack is broken at an acceleration speed, and the conducting bars can be softened and splashed out in serious cases.
(3) The welding points of the stator are burst; under the long-term action of large current and electrodynamic force, the resistance at the welding defect position of the stator winding joint is gradually increased, the heat is continuously increased, and a virtual connection discharge phenomenon appears in severe cases, so that the welding point is burst to further cause insulation damage.
(4) Transient overvoltage causes damage to insulation; the motor is directly started in full voltage, and operation overvoltage with high gradient is generated when the high-voltage switch is closed, so that the voltage distribution on a stator winding is uneven, and the insulation is greatly damaged.
Disclosure of Invention
In view of the above, the utility model provides a three-phase asynchronous motor can satisfy the customer and to the motor including frequently starting the actual use requirement of the various operating mode including, avoids damage and the functional failure that the operating mode leads to such as motor because of frequently starting.
A three-phase asynchronous motor comprises a stator and a rotor, wherein the stator comprises a base and a stator iron core fixed on the base, a stator winding is embedded in a groove of the stator iron core, the rotor comprises a cast aluminum rotor and a rotating shaft in the cast aluminum rotor, the stator iron core is formed by laminating high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm, and the cast aluminum rotor is formed by die-casting the high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm and high-temperature molten aluminum into a whole;
the insulating material between the stator iron core and the stator winding is not lower than H level (for example, the model of polyimide film polyaramide fiber paper soft composite material 6650 is adopted), the length of the insulating material extending out of the stator iron core on one side is 5-10 mm longer than that of the conventional standard design, and the thickness of the insulating material of the stator slot is increased by 10-20% compared with that of the conventional standard design.
Furthermore, the enameled wire of the stator winding adopts an anti-corona special enameled wire Q (ZY/XY) -BP/200 type for the variable frequency motor.
Furthermore, the cast aluminum rotor is of a squirrel cage structure, and the sectional area of the groove shape of the cast aluminum rotor is 115% -130% of that of the conventional standard design.
Further, the rotating shaft is pressed into the cast aluminum rotor preheated to 250-350 ℃ by adopting a shrink fit process, and the dynamic balance check is carried out on the cast aluminum rotor by adopting G1.0 dynamic balance precision grade.
Further, the heat load of the three-phase asynchronous motor is 75% -85% of that of the conventional standard design.
Further, the current density of the stator winding is 78% -90% of the conventional standard design.
Further, the stator core is subjected to paint dipping and baking treatment by adopting a vacuum pressure process.
Further, the wiring of the stator winding end is welded by acetylene and a high-quality silver copper welding rod is adopted.
The utility model discloses a take and reduce stator and rotor winding (conducting bar) calorific capacity and measure such as reinforcing electrical strength and mechanical strength of motor operation in-process, improved the reliability that the various operating modes of motor reply were used.
Drawings
Fig. 1 is a schematic structural view of a stator core with windings of the motor of the present invention.
Fig. 2 is a sectional view of a stator core.
Fig. 3 is a schematic view of the articulation of the wire joint.
Fig. 4 is a schematic diagram of welding of the winding heads.
Fig. 5 is a schematic diagram of the butt welding of the winding to the lead cable.
FIG. 6 is a schematic view of gas welding fusion welding.
Detailed Description
To describe the present invention more specifically, the following detailed description will be given to the technical solution of the present invention with reference to the accompanying drawings and the detailed description.
The utility model discloses a three-phase asynchronous motor, which comprises a stator and a rotor, wherein the stator consists of a base and a stator core with windings; as shown in fig. 1 and 2, the stator core structure with windings is composed of a core, windings, slot insulators, a middle pad, a cover pad, slot wedges and the like, wherein the stator core is formed by laminating stator punching sheets one by one, the total axial length after lamination is called the length of the core, and the length of the slot insulators, the middle pad and the cover pad extending out of the end face of the core is called the length of a straight line part of an insulating material extending out of the core on one side; the slot insulation clings to the inner wall of the iron core slot, enameled wires are arranged between the slot insulation and the middle pad and between the slot insulation and the cover pad, a slot wedge is inserted into the slot opening and used for fixing the enameled wires in the slot, and the slot wedge is inserted onto the cover pad.
In order to handle including power frequency full pressure line start, under full load line start, frequently just reverse, short-term overload, short-term overvoltage and so on various use operating mode to the motor probably cause stator winding overheated, rotor squirrel cage conducting bar impaired or fracture, potential hidden danger such as stator welding point burst, the utility model provides a specific corresponding solution:
(1) And the heating of the stator winding is reduced.
1.1 the heat load of the designed motor is 75% -80% of that of the common motor.
1.2, reducing the current density of the stator winding to ensure that the current density of the stator winding is 78-90 percent of that of the common motor.
(2) The quality of rotor squirrel cage is improved and the working condition is improved.
2.1 the rotor adopts the hot jacket technology to fix the cast aluminum rotor on the shaft, and the rotor is subjected to the dynamic balance check of level 1 of tightening (G2.5 is improved to G1), so that the motor operates stably and has small vibration.
2.2 the sectional area of the rotor conducting bar is increased to 115 percent to 130 percent of that of the common motor so as to reduce the current density of the rotor conducting bar and reduce the heating of the squirrel-cage rotor.
2.3 the rotor aluminum casting process is optimized, the best matching of the preheating temperature and the aluminum melting temperature of the rotor is realized, and a casting tool mold with good exhaust is designed, so that the aluminum conducting bars and the aluminum end rings of the cast aluminum rotor are formed into a whole through die casting and are tightly matched with the rotor punching sheet grooves, and intermittent discharge sparks generated between a conductor and a rotor iron core due to vibration when the motor is started or operated are eliminated.
2.4 pressing the processed rotating shaft into the cast aluminum rotor preheated to 250-350 ℃ by adopting a 'hot sleeve' process.
(3) The welding process of the end part of the motor coil is improved, the fusion welding process is optimized, and a high-quality silver-copper welding rod is adopted, so that the direct current resistance of a welding part is further reduced, and the specific process requirements are as follows:
3.1 the wire joint is tightly twisted, the hinge length is 25-35 mm, the wire joint is cut by a wire clipper to be even, and the welding is convenient, as shown in figure 3.
3.2 the windings are uniformly welded together as shown in FIG. 4.
3.3 the ends of the connection must be trimmed and the connection between the lead cable and the winding is butt welded as shown in fig. 5.
3.4 before welding, asbestos paper soaked by water is wrapped on the wire joint insulating tube, and a waste copper wire is wound to prevent the asbestos paper from falling off (the insulating tube is prevented from being burnt).
3.5 the flame control length should be adjusted according to the size of the wire section (the inner flame is generally controlled between 5-10 mm).
3.6 after the wire joint is welded by gas welding and melting, the hinged joint is loosened slightly by a wire cutting pliers, then the wire coat is burnt off by a flame head of an inner flame, the coat slag is slightly knocked off by the wire cutting pliers, and then a neutral flame (1-2 mm away from the flame center) is used, as shown in fig. 6.
3.7 tightening the joint with pliers while burning until they are welded together, cooling and forming a smooth sphere on the top of the joint, controlling the flame in the shortest range to avoid burning the insulation.
3.8 after welding, checking whether the welding joint is welded firmly, and avoiding the phenomena of missing joint, missing welding and false welding, wherein the diameter of a ball at the top of the welding joint is not less than the outer diameter of the hinged joint.
3.9 insulating package: the hinged joint is firstly bent and poured on a lead on one side which is not sleeved with the insulating tube, and is clamped flatly by using a clamp, then an enamel cloth belt is wrapped, a sleeve which is sleeved in advance is moved, and the insulation treatment and the lap joint length at the joint are required to be represented by a drawing.
3.10 end banding: the binding belt is tightly bound from the excircle to the inner circle (or from the inner circle to the excircle) by penetrating through a gap between two grooves at the end part through a curved needle; the interphase insulation is bound, and the joint of the binding belt is reserved at the position of the outer circle of the winding, which is close to the iron core, and is not reserved on the inner circle or the tip of the winding.
(4) And the insulation strength of the stator winding is improved.
4.1 the stator winding enameled wire uses a corona-resistant special enameled wire Q (ZY/XY) -BP/200 for the variable frequency motor.
4.2 the slot insulation adopts polyimide film polyaramide fiber paper soft composite material 6650.
4.3 the thickness of the slot insulation is improved by 10 to 20 percent compared with the thickness of the common motor.
The length of the 4.4-slot insulated single-side extended iron core is increased by 5-10 mm compared with the length of a common motor, as shown in figure 1.
4.5 the stator core with the winding adopts vacuum pressure dipping paint (VPI), H250 and below needs to be pre-dried, vacuumized, vacuum-preserved, dipped, pressurized, pressure-preserved, dripped with paint and dried, and the whole process is carried out for 10 hours; the time for H250 is 12 hours, so that the stator winding is full and thick in paint dipping, and the winding and the iron core form a complete whole, thereby improving the mechanical strength, the thermal stability, the moisture resistance, the voltage resistance and the high-order harmonic impact resistance of the winding.
4.6 the strength of the insulating structure between the pole phases is enhanced, and the mechanical and electrical strength is improved through the binding process of the end coils.
We further illustrate a specific product, example YE3-132S-4, wherein the comparison parameters of the conventional standard design of YE3-132S-4 380V/50Hz motor and the novel YE3-132S-4 380V/50Hz motor are shown in Table 1:
TABLE 1
It is thus clear that the utility model discloses a higher insulating material of heat-resisting grade (180 grades), the unilateral iron core length that stretches out of groove insulation is increased to 22 by (groove insulation length-iron core length)/2 =15, adopts and prevents corona frequency conversion special-purpose enameled wire (200 grades) to use VPI vacuum pressure varnished cloth to make stator winding varnished cloth plump, thick, the winding becomes a complete whole with the iron core, thereby has improved winding mechanical strength, thermal stability and humidity resistance and withstand voltage and high order harmonic impact resistance.
The utility model reduces the heat load and the current density of the stator winding, increases the rotor slot area and reduces the current density of the rotor conducting bar through the optimized design, reduces the heating of the stator and the rotor of the motor under the same load condition, and eliminates the hidden trouble of overheating of the stator winding and the rotor conducting bar; through the rotor shrink fit reduce because of the beating of the pivot that colds pressing caused, increase the dynamic balance precision grade, vibration is little, the noise is low, steady light and fast when guaranteeing the motor operation. The acetylene fusion welding of the silver-copper welding rod is adopted, so that the common quality hidden troubles of insufficient solder, desoldering and the like in low-voltage butt welding are thoroughly eliminated.
The utility model adopts better insulating materials and higher processing requirements, which leads to the increase of the manufacturing cost of the motor to a certain extent, but the reliability of the motor is obviously improved; through practical application, the use requirements of various working conditions including frequent starting of a customer are completely met, and the failure rate of the motor is reduced to 0.01% from 3% before. Greatly reduces the after-sale service cost, improves the reputation of enterprises and enhances the market competitiveness of products.
The foregoing description of the embodiments is provided to facilitate an understanding and appreciation of the invention and it will be readily apparent to those skilled in the art that various modifications can be made to the embodiments and that the general principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention according to the disclosure of the present invention within the protection scope of the present invention.
Claims (6)
1. A three-phase asynchronous motor comprising a stator and a rotor, characterized in that: the stator comprises a base and a stator iron core fixed on the base, a stator winding is embedded in a groove of the stator iron core, the rotor comprises a cast aluminum rotor and a rotating shaft in the cast aluminum rotor, the stator iron core is formed by laminating high-quality cold-rolled electrical steel sheets with the thickness of 0.5mm, and the cast aluminum rotor is formed by die-casting the high-quality cold-rolled electrical steel sheets with the thickness of 0.5mm and high-temperature molten aluminum into a whole;
the insulating material between the stator core and the stator winding is not lower than H level, the length of the insulating material extending out of the stator core on one side is 5-10 mm longer than that of the conventional standard design, and the thickness of the insulating material of the stator slot is increased by 10% -20% compared with that of the conventional standard design.
2. A three-phase asynchronous motor, according to claim 1, characterized in that: the enameled wire of the stator winding is an anti-corona enameled wire special for a variable frequency motor.
3. Three-phase asynchronous motor according to claim 1, characterized in that: the cast aluminum rotor is of a squirrel-cage structure, and the sectional area of the groove shape of the cast aluminum rotor is 115% -130% of that of the conventional standard design.
4. A three-phase asynchronous motor, according to claim 1, characterized in that: the heat load of the three-phase asynchronous motor is 75% -85% of that of the conventional standard design.
5. Three-phase asynchronous motor according to claim 1, characterized in that: the current density of the stator winding is 78% -90% of that of the conventional standard design.
6. Three-phase asynchronous motor according to claim 1, characterized in that: and the wiring part of the end part of the stator winding is welded by acetylene and adopts a high-quality silver copper welding rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221865210.3U CN218040946U (en) | 2022-07-19 | 2022-07-19 | Three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221865210.3U CN218040946U (en) | 2022-07-19 | 2022-07-19 | Three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218040946U true CN218040946U (en) | 2022-12-13 |
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ID=84385347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221865210.3U Active CN218040946U (en) | 2022-07-19 | 2022-07-19 | Three-phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218040946U (en) |
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2022
- 2022-07-19 CN CN202221865210.3U patent/CN218040946U/en active Active
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