Large ultra-low speed three-phase synchronous motor

Abstract

The application relates to the technical field of large-scale motors, and discloses a large-scale super-low-speed three-phase synchronous motor, which comprises a base, a stator assembly and a rotor assembly arranged on the base, and a follow-up assembly arranged on the two sides of a rotor disc; the follow-up assembly comprises a closed frame, the closed frame is connected with a rotating shaft through a connecting frame, the closed frame covers the area between a stator iron core and the rotor disc, a current equalizing cavity is arranged in the closed frame, and a convection port is arranged at the area corresponding to each rotor winding of the closed frame; and the two groups of follow-up assemblies are connected with air passing assemblies which are used for blowing or sucking gas into the current equalizing cavity. The application forms air flow by controlling the two groups of convection ports, each convection port can move along with the corresponding rotor winding, the air flow can relatively generate certain following, the surrounding of the rotor winding can be fully blown and cleaned, and effective heat dissipation can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-scale electric machines, and more particularly, to a large-scale ultra-low-speed three-phase synchronous AC electric motor. BACKGROUND

[0002] The large-scale three-phase AC brush-excited synchronous electric motor is a high-voltage electric motor specially designed for low-speed, large-torque, and constant-speed operation conditions, the rotor speed of which is strictly synchronized with the grid frequency, and the absolute constancy is maintained, and the large-scale three-phase AC brush-excited synchronous electric motor is widely applied to driving systems of heavy equipment such as ball mills, rod mills, cement rotary kilns, and mine hoists.

[0003] The rotating part (rotor) of this type of electric motor is mainly composed of a rotating shaft and a magnetic yoke, which is a huge alloy steel forging and is the skeleton of the entire rotating body, and convex pole magnets and excitation windings are arranged thereon, the excitation windings are wound on the convex pole magnets, and the main magnetic field is generated after the excitation current is introduced through the collector ring (slip ring), and the collector ring (slip ring) is installed on the rotating shaft and rotates with the shaft and is used to introduce the excitation current, and the stationary part (stator) is composed of a stator core and windings arranged on the base, the stator core is composed of silicon steel sheets laminated together, and the high-pressure formed windings are embedded therein, and a stationary thyristor excitation system can be provided, AC power is converted into controllable DC power through a thyristor rectifier, and then transmitted to the rotating collector ring through a brush device (carbon brush), and finally sent to the rotor excitation winding. The control core is the "excitation regulator", which can automatically maintain the stability of the motor voltage and power factor.

[0004] The large-scale electric motor has another obvious feature that the overall diameter of the rotor is large and the length is relatively short, and in actual use, a relatively low speed can be generated and a strong torque can be provided to directly drive the equipment to rotate at a low speed, without the need to design a corresponding speed reduction device, thereby reducing the cost.

[0005] In addition, since the above-mentioned electric motor is mainly used in a scene with relatively many dust particles, and the size of the electric motor is increased and is not suitable for movement, after the electric motor is installed, it is basically not moved, and therefore, during the long-term use of the electric motor, some dust particles, especially conductive dust, will inevitably exist in the electric motor, and if they cover the windings, a conductive channel will be easily formed, which will affect the operation of the electric motor and has certain danger. Although some electric motors are provided with a certain dustproof structure, excessive dustproof will affect the overall heat dissipation of the electric motor, and in a serious dust environment, even if the dustproof structure is provided, part of the dust will break through the dustproof structure and enter the electric motor. Therefore, in the design of the above-mentioned electric motor, a corresponding airflow type heat dissipation structure and a heat dissipation system are used to blow air to the related windings, so as to not only dissipate heat from the windings but also clean the windings and other structures, thereby avoiding the accumulation of a large amount of dust particles.

[0006] However, in the existing air flow cleaning mode, a transverse air flow is formed in the area between the rotor and the stator in the motor, which can effectively clean the area directly opposite to the stator and the rotor, but the windings on the rotor of some motors are distributed one by one, and there is a space between two adjacent windings (salient pole magnetic poles), and the rotor is not a complete circle as a whole, especially the side of the protruding part away from the rotation direction during the rotation of the rotor, so the air flow is not easy to blow to, thereby leading to a relatively poor cleaning effect of the side area, and dust accumulation is easy to form in this area for a long time. SUMMARY

[0007] The large ultra-low-speed three-phase synchronous motor provided by the application solves the problem that, in the existing air flow cleaning mode, the side of the protruding part away from the rotation direction during the rotation of the rotor is not easy to blow to, thereby leading to a relatively poor cleaning effect of the side area, and dust accumulation is easy to form in this area for a long time.

[0008] To achieve the above-mentioned purpose, the application provides the following technical scheme: a large ultra-low-speed three-phase synchronous motor, comprising a base, a stator assembly and a rotor assembly arranged on the base, the stator assembly comprising a stator core fixedly installed on the base, and a stator winding arranged in the stator core, the rotor assembly comprising a rotor disc and a rotating shaft, the rotor disc being fixedly installed on the rotating shaft, a plurality of rotor windings being arranged on the rotor disc, and a machine shell being further arranged on the base.

[0009] Both sides of the rotor disc are provided with a follow-up assembly, the follow-up assembly comprising an enclosed frame connected to the rotating shaft through a connecting frame, the enclosed frame covering the area between the stator core and the rotor disc, a flow equalization cavity being arranged in the enclosed frame, and a convection port being arranged at the position of each rotor winding of the enclosed frame.

[0010] The two follow-up assemblies are connected with an air exchange assembly, the air exchange assembly being used for blowing or sucking air into or out of the flow equalization cavity.

[0011] Preferably, the air exchange assembly comprises two sets of air exchange butt joints, the two sets of air exchange butt joints being arranged at positions corresponding to the two sets of enclosed frames on the machine shell, the position of the enclosed frame corresponding to the air exchange butt joint being provided with an opening, a butt joint ring cover being fixedly installed at the position of the enclosed frame in the machine shell, the butt joint ring cover being rotationally fitted with the enclosed frame, the air exchange assembly further comprising a gas supply pump and an air exhaust pump, and the two sets of air exchange butt joints being connected with the gas supply pump and the air exhaust pump through a reversing valve assembly.

[0012] Preferably, the closed frame is provided with an air gap air outlet at the area between the rotor winding and the stator winding, and a movable air baffle assembly is arranged in the convection port except the area of the air gap air outlet, the movable air baffle assembly is used to guide the air flow, and the movable air baffle assembly changes the flow direction of the air flow through the convection port by changing the posture.

[0013] Preferably, the movable air baffle assembly is a rotary movable air baffle, the rotary movable air baffle is rotatably installed in the convection port, the rotary axis of the rotary movable air baffle is arranged in parallel with the tangent of the rotary shaft, the side of the rotary movable air baffle away from the rotary connection position is arranged as a movable side, an arc-shaped guide groove is arranged in the inner wall of the convection port corresponding to the movable side of the rotary movable air baffle, a sliding block structure is arranged in the arc-shaped guide groove corresponding to the arc-shaped guide groove, and an elastic member is arranged between the convection port and the rotary movable air baffle, the elastic member is used to drive the movable side of the rotary movable air baffle to move close to the center of the rotor disc.

[0014] Preferably, the movable air baffle assembly is a sliding movable air baffle, a sliding groove parallel to the rotary shaft is arranged on the side wall of the convection port, the end of the sliding movable air baffle is slidably installed in the sliding groove, a bent guide groove is arranged at the end of the sliding groove close to the rotor disc, and the region of the sliding movable air baffle corresponding to the bent guide groove is curved and elastic.

[0015] Preferably, a movable plate is slidably arranged in the uniform flow cavity corresponding to the convection port, a flow limiting through hole is arranged on the movable plate, when the air flow assembly forms the air flow in the uniform flow cavity and passes through the movable plate through the flow limiting through hole, the flow limiting through hole limits the flow, a pressure difference is formed on both sides of the movable plate, and the movable plate moves.

[0016] Preferably, the movable plate is a hollow structure, the flow limiting through holes on the movable plate are divided into air outlet through holes and air inlet through holes, the air outlet through holes pass through the movable plate and communicate the uniform flow cavity and the convection port, the air inlet through holes are arranged on the side of the movable plate close to the rotor disc and communicate the uniform flow cavity and the inner cavity of the movable plate, an air outlet docking port is arranged on the side of the movable plate away from the convection port, the air outlet docking port communicates the inner cavity of the movable plate and the uniform flow cavity, and a one-way valve structure is arranged in each of the air outlet through holes and the air inlet through holes, the one-way valve in the air outlet through hole allows the air to pass from the uniform flow cavity to the convection port, and the one-way valve in the air inlet through hole allows the air to pass from the convection port to the uniform flow cavity.

[0017] Preferably, a dust adsorption structure is arranged in the movable plate, the dust adsorption structure is used to adsorb dust, the dust adsorption structure is a viscous structure attached to the inner cavity of the movable plate, and a wave-shaped protrusion is arranged on the viscous structure.

[0018] Preferably, the ventilation assembly comprises ventilation fans, two groups of closed frames are provided with ventilation openings away from one side of the rotor disc, ventilation fans are rotatably installed at the ports of the ventilation openings, the ventilation fans are provided with matching gears, fixed gear rings are fixedly installed at the areas corresponding to the matching gears of the casing, and the fixed gear rings and the matching gears are intermeshed, wherein the ventilation fans on one group of closed frames blow air into the uniform flow cavities of the group when rotating, and the ventilation fans on the other group of closed frames inhale air from the uniform flow cavities of the group when rotating.

[0019] Preferably, a mounting sleeve is installed at the area of the rotating shaft corresponding to the connecting frame, the mounting sleeve is sleeved on the rotating shaft, the mounting sleeve and the rotating shaft are fixedly connected through a locking structure, the mounting sleeve is provided with a driven driving structure, the connecting frame is a plurality of connecting rod structures distributed in a radial manner, and movable counterweights are slidably arranged on the connecting rods and fixedly connected with the connecting rods through a locking structure.

[0020] The beneficial effects of the present application are that:

[0021] The present application controls the ventilation assembly to blow air into one group of uniform flow cavities and inhale air from the other group of uniform flow cavities, so that one group of convection ports directly blow out gas to the rotor winding and the gap between the rotor winding and the stator winding, and the other group of convection ports inhale gas from the rotor winding and the gap between the rotor winding and the stator winding to form an air flow, and each convection port also moves with the corresponding rotor winding, the air flow can relatively generate a certain following, so that the surrounding of the rotor winding can be fully blown and cleaned and effectively cooled.

[0022] The closed frame as a covering structure can also shield and protect the key positions of the rotor winding and the stator winding, further reduce the entry of dust, and effectively improve the safety of the motor in use, and a plurality of lug structures are arranged inside the convection port, which drives the internal gas to rotate relative to the external gas when the convection port rotates, to improve the following effect of the convection port blowing out gas. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is a schematic diagram of the internal structure of the casing of the present application;

[0025] Figure 3 It is a schematic diagram of the distribution state of each convection port on the closed frame of the present application;

[0026] Figure 4 It is a simple view of the cooperation relationship between the stator assembly and the rotor assembly of the present application;

[0027] Figure 5 It is a structure schematic diagram of the present application using a ventilation fan as a ventilation assembly;

[0028] Figure 6 The distribution state schematic diagram of the ventilation fan outside the closed frame of the application;

[0029] Figure 7 The structure schematic diagram of the application using the ventilation pipe as the ventilation assembly;

[0030] Figure 8 The structure schematic diagram of the application after improving the follow-up assembly;

[0031] Figure 9 The structure schematic diagram of the application using the rotating movable air deflector;

[0032] Figure 10 The structure schematic diagram of the application using the sliding movable air deflector;

[0033] Figure 11 The A part structure enlarged view of the application; Figure 10

[0034] Figure 11 The structure schematic diagram of the application after improving the movable plate;

[0035] Figure 12 The B part structure enlarged view of the application; Figure 13

[0036] The figure marks are as follows: 1, the machine base; 11, the rotating support; 12, the machine shell; 2, the stator assembly; 21, the stator core; 22, the stator winding; 3, the rotor assembly; 31, the rotor rotating disc; 32, the rotating shaft; 33, the rotor winding; 4, the follow-up assembly; 41, the closed frame; 411, the convection port; 412, the flow equalizing cavity; 413, the air gap air port; 42, the connecting frame; 421, the movable counterweight; 422, the mounting sleeve; 43, the ventilation port; 5, the ventilation fan; 51, the fixed tooth ring; 52, the matching gear; 6, the ventilation butt joint pipe; 61, the butt joint ring cover; 7, the movable air deflector assembly; 71, the rotating movable air deflector; 711, the arc-shaped guide groove; 72, the sliding movable air deflector; 721, the bent guide groove; 8, the movable plate; 81, the flow limiting through hole; 811, the air outlet through hole; 812, the air inlet through hole; 813, the reduced diameter part; 82, the air outlet butt joint port; 83, the one-way blocking plug; 84, the dust adsorption structure. DETAILED DESCRIPTION

[0037] It is necessary to point out here that the following detailed description is only used to further illustrate the application, and cannot be understood as limiting the protection scope of the application, and the skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0038] ​​The application will be further described in detail below with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the application and cannot be understood as limiting the scope of protection of the application. Those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0039] Referring to the drawings accompanying the specification Figure 12 And Figure 1 , a large ultra-low speed three-phase synchronous motor, comprising a base 1, a stator assembly 2 and a rotor assembly 3 are arranged on the base 1, the stator assembly 2 comprises a stator core 21, the stator core 21 is fixedly installed on the base 1, a stator winding 22 is arranged on the inner circumferential side of the stator core 21, the rotor assembly 3 comprises a rotor disc 31 and a rotating shaft 32, the rotor disc 31 is fixedly installed on the rotating shaft 32, the rotating shaft 32 is rotatably installed on the base 1 through a rotating support 11 (for example, a seat type sliding bearing), a plurality of rotor windings 33 (for example, corresponding to salient pole magnets and field windings) are arranged on the outer circumferential side of the rotor disc 31, referring to the drawings accompanying the specification Figure 2 , the rotor windings 33 cooperate with the stator windings 22, and a gap, that is, an air gap, is formed between the rotor assembly 3 and the stator assembly 2, a machine shell 12 is further arranged on the base 1, the stator assembly 2 and the rotor disc 31 are arranged in the machine shell 12, and the two ends of the rotating shaft 32 extend out of the machine shell 12 to cooperate with the rotating support 11 and form a motor output portion connected with a main shaft of a device to be driven (for example, a large ball mill).

[0040] It should be noted that the above structure is a conventional structure of a large three-phase alternating current brush field synchronous motor, and the detailed scheme is not explained in detail in this embodiment, and the corresponding collector ring and brush structure arranged on the rotor disc 31 is also a conventional structure of a large motor, which is not described in detail in this embodiment. This type of motor can run at ultra-low speed, can realize large torque output, and can be directly driven at low speed, which saves a large gear reduction box, the system structure is simpler, the system energy consumption is reduced, and the system energy saving is realized.

[0041] Among them, the two sides of the rotor disc 31 are provided with a follow-up assembly 4, the follow-up assembly 4 comprises an enclosed frame 41, the enclosed frame 41 is connected with the rotating shaft 32 through a connecting frame 42, so that when the rotating shaft 32 rotates, the enclosed frame 41 is driven to rotate synchronously with the rotor disc 31, and the enclosed frame 41 covers the area between the stator core 21 and the rotor disc 31, that is, the stator windings 22 and the rotor windings 33 are both within the coverage range of the enclosed frame 41, and a uniform flow cavity 412 is arranged in the enclosed frame 41, and a convection port 411 is arranged at the position corresponding to each rotor winding 33 of the enclosed frame 41, referring to the drawings accompanying the specification Figure 4 And Figure 3 The convection ports 411 are distributed in a radial manner on the enclosed frame 41.

[0042] Meanwhile, the two groups of follow-up assemblies 4 are connected with ventilation assemblies, which are used to blow or suck gas into the uniform flow cavities 412, that is, the ventilation assemblies have the functions of gas supply and gas suction, so as to form a blowing or suction gas flow at the corresponding convection ports 411. Specifically, in actual use, the ventilation assemblies are controlled to blow gas into one group of uniform flow cavities 412 and to suck gas from the other group of uniform flow cavities 412, so that the convection ports 411 of one group directly blow gas to the rotor winding 33 and the gap between the rotor winding 33 and the stator winding 22, and the convection ports 411 of the other group suck gas from the rotor winding 33 and the gap between the rotor winding 33 and the stator winding 22, so as to form a transverse gas flow in the space between the rotor winding 33 and the stator winding 22, thereby avoiding excessive dust adhering to the surfaces of the rotor winding 33 and the stator winding 22.

[0043] It should be noted that the closed frame 41 rotates synchronously with the rotating shaft 32 when the rotating shaft 32 rotates, and therefore each convection port 411 also moves with the corresponding rotor winding 33, so that the gas flow can relatively follow when the gas flow is formed, that is, the rotor winding 33 does not gradually move away from the gas flow during the blowing process of the gas flow, so that the rotor winding 33 can be fully blown and cleaned and effectively cooled, and the closed frame 41 as a covering structure can also shield and protect the key positions of the rotor winding 33 and the stator winding 22, further reducing the entry of dust and effectively improving the safety of the motor. In addition, in high-altitude areas, the closed frame 41 can also adjust the tightness with the rotor disc 31 and the stator core 21, adjust the gas inlet and outlet speed, adjust the air pressure between them, and also solve the influence of small air pressure at high altitude on the motor. The inside of the convection port 411 can also be provided with a plurality of flange structures, which can drive the internal gas to rotate relative to the external gas when the convection port 411 rotates, so as to improve the follow-up (following the movement of the rotor winding 33) effect of the gas blown out of the convection port 411.

[0044] In addition, the above structure does not change the traditional main structure of the existing motor, and only the follow-up assembly 4 is used as an additional structure, so that many existing large motors can be simply improved without the need for re-production, thereby reducing costs. In addition, the above cleaning method can also form further forced air cooling, which eliminates the need for fans and other mechanisms inside the motor, reduces mechanical loss of the motor, and improves motor efficiency.

[0045] Further, referring to the drawings attached to the specification Figure 4 and Figure 5The ventilation assembly can be arranged on the closed frame 41, for example, the ventilation assembly comprises the ventilation fan 5, the side of the closed frame 41 away from the rotor disc 31 is provided with a ventilation port 43, the ventilation fan 5 is rotatably arranged at the port of the ventilation port 43, the ventilation fan 5 is externally provided with a matching gear 52, the region of the casing 12 corresponding to the matching gear 52 is fixedly provided with a fixed gear ring 51, and the fixed gear ring 51 and the matching gear 52 are in meshing engagement.

[0046] In the above scheme, when the closed frame 41 rotates, each matching gear 52 can be driven to rotate, thereby driving the ventilation fan 5 to rotate. At this time, the fan blade structure of the ventilation fan 5 is arranged to blow air into the uniform flow cavity 412, so that the convection port 411 on this side blows air. At this time, the opposite closed frame 41 can be directly provided with an air outlet to directly exhaust air. Alternatively, the same arrangement as the ventilation fan 5 on this side can be used. The difference is that the ventilation fan 5 on the opposite side rotates to draw air from the uniform flow cavity 412, thereby forming blowing and suction control on both sides. This scheme does not need to arrange a corresponding gas control device, but can achieve the above purpose by rotating the shaft 32. However, the controllability is poor, and the air flow intensity is poor. Therefore, in actual design, the specific conditions can be reasonably selected.

[0047] Further, referring to the drawings Figure 6 The embodiment also provides another scheme of the ventilation assembly. Specifically, the ventilation assembly comprises two groups of ventilation connecting pipes 6, the two groups of ventilation connecting pipes 6 are arranged on the casing 12 at positions corresponding to the two groups of closed frames 41, the region of the closed frame 41 corresponding to the ventilation connecting pipe 6 is provided as an opening, the casing 12 is fixedly provided with a connecting ring cover 61 inside the position corresponding to the closed frame 41, the connecting ring cover 61 is rotatably fitted with the closed frame 41, thereby sealing the opening of the closed frame 41, and thereby forming the communication between the ventilation connecting pipe 6 and the uniform flow cavity 412. While ensuring that the closed frame 41 can normally rotate, the ventilation assembly can also be used for air suction or blowing. The ventilation assembly further comprises a gas supply pump and an air exhaust pump. The two groups of ventilation connecting pipes 6 are connected with the gas supply pump and the air exhaust pump through a reversing valve assembly. Through the control of the reversing valve assembly, the two groups of ventilation connecting pipes 6 can be alternately connected with the gas supply pump or the air exhaust pump in actual use. That is, in actual control, one group of ventilation connecting pipes 6 is connected with the gas supply pump to blow air into the corresponding uniform flow cavity 412, and the other group of ventilation connecting pipes 6 is connected with the air exhaust pump to suck air from the corresponding uniform flow cavity 412. The reversing valve assembly can alternately control the above conditions, that is, the gas flow direction between the two groups of convection ports 411 can be changed, thereby achieving more effective cleaning and heat dissipation. In addition, using the gas supply pump and the air exhaust pump to drive the air flow can obtain more powerful air flow, thereby improving the heat dissipation effect and the dust removal capacity.

[0048] The above is a simple example of the servo assembly 4 in this embodiment. In addition, the servo assembly 4 is improved as follows in this embodiment. Specifically, referring to the drawings Figure 7 The closed frame 41 is provided with an air gap air outlet 413 at the region between the mover winding 33 and the stator winding 22. The air gap air outlet 413 is a fixed air outlet structure, that is, the structure is fixed, and the directions of the inflowing and outflowing air are basically stable, so as to emphasize the cleaning of the region between the mover winding 33 and the stator winding 22. In addition, in order to facilitate more sufficient cleaning of the side surface portions of the mover winding 33 and the stator winding 22, the region of the convection port 411 except the air gap air outlet 413 is provided with a movable air deflector assembly 7. The movable air deflector assembly 7 is used to guide the air flow, and the movable air deflector assembly 7 changes the flow direction of the air flow through the convection port 411 by changing the posture.

[0049] Specifically, referring to the drawings Figure 8 The movable air deflector assembly 7 can be a rotary movable air deflector 71. That is, the rotary movable air deflector 71 is rotatably installed in the convection port 411. The rotary axis of the rotary movable air deflector 71 is parallel to the tangent of the rotating shaft 32. The side of the rotary movable air deflector 71 away from the rotary connection position of the convection port 411 is set as the movable side. The position of the convection port 411 corresponding to the movable side of the rotary movable air deflector 71 is provided with an arc-shaped guide groove 711. The position of the rotary movable air deflector 71 corresponding to the arc-shaped guide groove 711 is provided with a sliding block structure slidingly installed in the arc-shaped guide groove 711. The convection port 411 and the rotary movable air deflector 71 are provided with an elastic member (for example, a torsion spring arranged at the rotary connection position of the convection port 411 and the rotary movable air deflector 71). The elastic member is used to drive the movable side of the rotary movable air deflector 71 to move close to the center of the mover disc 31.

[0050] Specifically, when the rotating shaft 32 is stationary, the rotary movable air deflector 71 actively turns over and moves close to the center of the mover disc 31. At this time, the air flow through the convection port 411 is guided by the rotary movable air deflector 71 in this state (except the air flow in the air gap air outlet 413). During the starting of the motor, the mover disc 31 gradually and slowly rotates. Under the action of the centrifugal force, the rotary movable air deflector 71 gradually turns over outward, changes the direction of guiding the air flow, and thus can effectively clean the radial side surface region of the mover winding 33 or the stator winding 22. Similarly, when the motor stops and the mover disc 31 gradually stops rotating, the rotary movable air deflector 71 gradually returns to the initial state.

[0051] It should be noted that the above scheme has a simple structure and low cost. However, the guiding direction of the rotary movable air deflector 71 will change only when the rotating speed of the rotating shaft 32 changes. Therefore, another movable air deflector assembly 7 is provided in this embodiment. Specifically, referring to the drawingsFigure 9 and Figure 10 The movable air deflector assembly 7 is a sliding movable air deflector 72, a sliding groove parallel to the axis of the rotating shaft 32 is arranged on the side wall of the convection port 411, the end of the sliding movable air deflector 72 is slidingly installed in the sliding groove, a bent guide groove 721 is arranged at one end of the sliding groove close to the rotor disc 31, the area of the sliding movable air deflector 72 corresponding to the bent guide groove 721 has bending elasticity (for example, an elastic plate structure is used), the movable plate 8 is slidingly arranged in the area of the uniform flow cavity 412 corresponding to the convection port 411, the flow limiting through hole 81 is arranged on the movable plate 8, when the air flow in the uniform flow cavity 412 forms and passes through the movable plate 8 through the flow limiting through hole 81, the air flow is limited by the flow limiting through hole 81, a pressure difference is formed on both sides of the movable plate 8, and movement is formed.

[0052] For example, referring to the drawings Figure 11 When the right side uniform flow cavity 412 is connected with the air supply pump and the left side uniform flow cavity 412 is connected with the air exhaust pump, the air flow flows from the right side convection port 411 to the left side convection port 411, at this time, the movable plate 8 in the right side uniform flow cavity 412 is moved to the left under the action of the air flow to the left, and presses the corresponding sliding movable air deflector 72, so that the end of the sliding movable air deflector 72 contacts the bent guide groove 721, referring to the drawings Figure 10 and the sliding movable air deflector 72 is bent, on the contrary, the movable plate 8 in the left side uniform flow cavity 412 is moved to the left, and does not contact the corresponding sliding movable air deflector 72, the left side sliding movable air deflector 72 is rebounded and straightened under the action of the elasticity of the sliding movable air deflector 72 itself (an elastic member can also be arranged to automatically push the sliding movable air deflector 72 to move away from the rotor disc 31), and through the alternating control of air suction or air blowing in the uniform flow cavities 412 on both sides, the specific guiding conditions of the sliding movable air deflectors 72 on both sides can also be alternately controlled, so that the air flow is adjusted to have sufficient air flow impact area to effectively clean the side surfaces of the stator winding 22 and the rotor winding 33.

[0053] In the above scheme, the dust blown away is mainly taken away by the long-time air flow, and the corresponding dust filtering treatment structure is arranged on the external pipeline, but part of the motor is originally provided with a corresponding dust protection structure, therefore, the above device only further avoids the attachment of residual dust, and the amount of dust actually removed is not large, the cost of the special dust filtering structure is relatively large, and when the air flow direction is changed through the alternating control of the two groups of convection ports 411, the dust brought into the uniform flow cavity 412 by the previous air suction is also easily blown out when the air blowing is reversed. Therefore, the following scheme is further provided in the embodiment, in particular, referring to the drawings Figure 11 and Figure 12, the movable plate 8 is a hollow structure, a plurality of flow limiting through holes 81 on the movable plate 8 are divided into gas outlet through holes 811 and gas inlet through holes 812, the gas outlet through holes 811 pass through the movable plate 8 and communicate with the uniform flow cavity 412 and the convection port 411, while the gas inlet through holes 812 are only arranged on the side of the movable plate 8 close to the rotor disc 31 and communicate with the uniform flow cavity 412 and the inner cavity of the movable plate 8, and the air vent butt joint pipe 6 is located in the region of the movable plate 8 away from the convection port 411, and the side of the movable plate 8 away from the convection port 411 is provided with a gas outlet butt joint port 82, which makes the inner cavity of the movable plate 8 communicate with the uniform flow cavity 412, that is to say, the gas inlet through holes 812 actually communicate with the uniform flow cavity 412 through the inner cavity of the movable plate 8 and the gas outlet butt joint port 82.

[0054] In addition, one-way valve structures are arranged in the gas outlet through holes 811 and the gas inlet through holes 812, the passing direction of the one-way valve in the gas outlet through holes 811 is from the uniform flow cavity 412 to the convection port 411, and the passing direction of the one-way valve in the gas inlet through holes 812 is from the convection port 411 to the uniform flow cavity 412, that is to say, the passing directions of the two one-way valves are opposite, and only one set of one-way valve is conducted under the same air flow direction.

[0055] For example, referring to the drawings Figure 13 When the right side uniform flow cavity 412 is connected with a gas supply pump and the left side uniform flow cavity 412 is connected with a gas exhaust pump, the air flow is from the right side convection port 411 to the left side convection port 411, at this time, the one-way valve in the gas outlet through hole 811 in the right side movable plate 8 is conducted, and the gas directly passes through the movable plate 8 on this side, while the one-way valve in the gas inlet through hole 812 in the left side movable plate 8 is conducted, and after the air flow passing through the rotor winding 33 and the stator winding 22 enters the convection port 411 on this side, the air flow passes through the inner cavity of the movable plate 8 through the gas inlet through hole 812 and then passes through the gas outlet butt joint port 82 to the left side uniform flow cavity 412, at this time, the air flow carrying dust flows in the inner cavity of the movable plate 8, and a dust adsorption structure 84 is arranged in the inner cavity of the movable plate 8, which is used for adsorbing dust, such as a viscous structure, a non-uniform concave-convex surface structure and the like, and when the air flow direction between the two convection ports 411 is reversed in the subsequent control, the one-way valve in the left side gas inlet through hole 812 is closed, and the newly entered air flow does not pass through the inner cavity of the movable plate 8, so that the dust cannot be brought to the rotor winding 33 and the stator winding 22, in addition, when the motor is periodically maintained subsequently, the movable plate 8 is taken out, and the dust adsorption structure 84 is cleaned or replaced.

[0056] The one-way valve can use, for example, the drawings Figure 12The structure shown, i.e. the one-way valve comprises a one-way sealing plug 83 which is slidingly installed in the air outlet through hole 811 or the air inlet through hole 812, and the air outlet through hole 811 and the air inlet through hole 812 are provided with a reduced diameter portion 813, and the air inlet through hole 812 is in sliding contact with the reduced diameter portion 813, thereby forming a seal for the air outlet through hole 811 or the air inlet through hole 812.

[0057] In the above scheme, the follower assembly 4 can be used to improve the existing equipment as an after-sales device, therefore, the closing frame 41 can be provided as a structure detachably installed on the rotating shaft 32, for example, referring to the drawings Figure 13 Figure 8 The area of the rotating shaft 32 corresponding to the connecting frame 42 is provided with a mounting sleeve 422, the mounting sleeve 422 is sleeved on the rotating shaft 32, and the mounting sleeve 422 and the rotating shaft 32 are fixedly connected through a locking structure, after the locking structure is unlocked, the mounting sleeve 422 is in rotational cooperation with the rotating shaft 32, for example, a positioning pin, a screw or the like can be provided to install the mounting sleeve 422, and a driven driving structure such as a belt wheel and a gear wheel can also be provided on the mounting sleeve 422, when the motor is stopped, the mounting sleeve 422 is unlocked and can be driven by the driving structure to drive the closing frame 41 to rotate, so as to control the reciprocating rotation of the closing frame 41 in the stationary state of the rotor disc 31 to clean comprehensively and rapidly cool after stopping, thereby increasing more modes for the use of the follower assembly 4.

[0058] In addition, the connecting frame 42 can be provided with a plurality of connecting rods distributed in a radial manner, and the movable counterweight 421 is slidingly arranged on the connecting rod, the movable counterweight 421 is fixedly connected with the connecting frame 42 through a screw or the like, and the position of the movable counterweight 421 on the connecting frame 42 is adjustable.

[0059] It should be noted that, due to the large size of the rotor disc 31, it is difficult to achieve precise rotational dynamic balance during production, therefore, after the motor is completely assembled, the actual rotational dynamic balance of the entire rotating structure can be adjusted by testing and adjusting the positions of the movable counterweights 421, and even if the mass center of the rotating structure changes slightly due to other reasons, the movable counterweights 421 can be further adjusted by adjusting the number and positions of the movable counterweights 421, thereby effectively improving the maintenance efficiency of the motor and reducing the maintenance cost.

[0060] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A large ultra-low speed AC three-phase synchronous motor, including a frame (1), a stator assembly (2) and a mover assembly (3) are provided on the frame (1), the stator assembly (2) includes a stator core (21), the stator core (21) is fixedly installed on the frame (1), and a stator winding (22) is provided inside the stator core (21), the mover assembly (3) includes a mover turntable (31) and a rotating shaft (32), the mover turntable (31) is fixedly installed on the rotating shaft (32), and multiple sets of mover windings (33) are provided on the mover turntable (31), and a housing (12) is also provided on the frame (1); Its features are: Both sides of the mover turntable (31) are provided with follower components (4). The follower components (4) include a closed frame (41). The closed frame (41) is connected to the rotating shaft (32) through a connecting frame (42). The closed frame (41) covers the area between the stator core (21) and the mover turntable (31). The closed frame (41) is provided with a flow equalization cavity (412) inside. The closed frame (41) is provided with a convection port (411) at the area corresponding to each mover winding (33). Both sets of follower components (4) are connected to a ventilation component, which is used to blow or draw gas into the flow equalization chamber (412).

2. The large ultra-low speed AC three-phase synchronous motor according to claim 1, characterized in that: The ventilation assembly includes two sets of ventilation connecting pipes (6), which are respectively set on the housing (12) at positions corresponding to two sets of sealing frames (41). The sealing frame (41) is set with an opening in the area corresponding to the ventilation connecting pipe (6). A docking ring cover (61) is fixedly installed inside the housing (12) at the position corresponding to the sealing frame (41). The docking ring cover (61) is rotatably fitted with the sealing frame (41). The ventilation assembly also includes an air supply pump and an air extraction pump. The two sets of ventilation connecting pipes (6) are connected to the air supply pump and the air extraction pump through a reversing valve assembly.

3. The large ultra-low speed AC three-phase synchronous motor according to claim 2, characterized in that: The enclosed frame (41) is provided with an air gap vent (413) in the area between the mover winding (33) and the stator winding (22). In the convection port (411), except for the area of ​​the air gap vent (413), a movable air guide plate assembly (7) is provided. The movable air guide plate assembly (7) is used to guide the airflow, and the movable air guide plate assembly (7) changes the flow direction of the airflow through the convection port (411) by changing its posture.

4. The large ultra-low speed AC three-phase synchronous motor according to claim 3, characterized in that: The movable air guide plate assembly (7) is a rotating movable air guide plate (71). The rotating movable air guide plate (71) is rotatably installed inside the convection port (411). The rotation axis of the rotating movable air guide plate (71) is parallel to the tangent of the rotating shaft (32). The side of the rotating movable air guide plate (71) away from its rotational connection with the convection port (411) is set as the movable side. An arc-shaped guide groove (711) is provided in the inner wall of the convection port (411) at the position corresponding to the movable side of the rotating movable air guide plate (711). A slider structure is provided in the arc-shaped guide groove (711) at the position corresponding to the position of the rotating movable air guide plate (711). An elastic element is provided between the convection port (411) and the rotating movable air guide plate (71). The elastic element is used to drive the movable side of the rotating movable air guide plate (71) to move closer to the center of the moving turntable (31).

5. The large ultra-low speed AC three-phase synchronous motor according to claim 3, characterized in that: The movable air guide plate assembly (7) is a sliding movable air guide plate (72). A groove parallel to the axis of the rotating shaft (32) is provided on the side wall of the convection port (411). The end of the sliding movable air guide plate (72) is slidably installed in the groove. A bending guide groove (721) is provided at one end of the groove near the moving turntable (31). The area of ​​the sliding movable air guide plate (72) corresponding to the bending guide groove (721) has bending elasticity.

6. The large ultra-low speed AC three-phase synchronous motor according to claim 5, characterized in that: A movable plate (8) is slidably disposed in the area corresponding to the flow port (411) in the flow equalization cavity (412). A limited flow hole (81) is provided on the movable plate (8). When the ventilation component forms gas flow in the flow equalization cavity (412) and passes through the limited flow hole (81) through the movable plate (8), it is restricted by the flow of the limited flow hole (81), so that a pressure difference is formed on both sides of the movable plate (8), thereby causing it to move.

7. The large ultra-low speed AC three-phase synchronous motor according to claim 6, characterized in that: The movable plate (8) is a hollow structure. The multiple flow-limiting holes (81) on the movable plate (8) are divided into an exhaust hole (811) and an intake hole (812). The exhaust hole (811) penetrates the movable plate (8) and connects the flow equalization cavity (412) and the convection port (411). The intake hole (812) is located on the side of the movable plate (8) near the moving turntable (31) and connects to the flow equalization cavity (412) and the inner cavity of the movable plate (8). The ventilation connecting pipe (6) is located on the side of the movable plate (8) away from the convection port (411). The movable plate (8) is provided with an air outlet interface (82) on the side opposite to the convection port (411). The air outlet interface (82) connects the inner cavity of the movable plate (8) with the flow equalization cavity (412). Both the air outlet (811) and the air inlet (812) are provided with a one-way valve structure. The one-way valve in the air outlet (811) is allowed to pass from the flow equalization cavity (412) to the convection port (411). The one-way valve in the air inlet (812) is allowed to run from the convection port (411) to the flow equalization cavity (412).

8. The large ultra-low speed AC three-phase synchronous motor according to claim 7, characterized in that: The movable plate (8) is provided with a dust adsorption structure (84) inside. The dust adsorption structure (84) is used to adsorb dust. The dust adsorption structure (84) is an adhesive structure attached to the inner cavity of the movable plate (8), and the adhesive structure is provided with wavy protrusions.

9. The large ultra-low speed AC three-phase synchronous motor according to claim 1, characterized in that: The ventilation assembly includes a ventilation fan (5). Two sets of the enclosure frames (41) are provided with ventilation ports (43) on the side away from the moving turntable (31). A ventilation fan (5) is rotatably installed at the port of the ventilation port (43). A mating gear (52) is provided on the outside of the ventilation fan (5). A fixed gear ring (51) is fixedly installed on the housing (12) in the area corresponding to the mating gear (52). The fixed gear ring (51) meshes with the mating gear (52). When the ventilation fan (5) on one set of the enclosure frames (41) rotates, it blows air into the flow equalization chamber (412) of that set. When the ventilation fan (5) on the other set of the enclosure frames (41) rotates, it draws air from the flow equalization chamber (412) of that set.

10. The large ultra-low speed AC three-phase synchronous motor according to claim 8 or 9, characterized in that: An installation sleeve (422) is installed on the rotating shaft (32) in the area corresponding to the connecting frame (42). The installation sleeve (422) is fitted on the rotating shaft (32). The installation sleeve (422) and the rotating shaft (32) are fixedly connected by a locking structure. The installation sleeve (422) is provided with a driven structure. The connecting frame (42) is a structure of multiple connecting rods distributed radially. A movable counterweight (421) is slidably arranged on the connecting rod. The movable counterweight (421) is fixedly connected to the connecting rod by a tightening structure.

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