Insulation structure for a doubly-fed electric machine

Abstract

This invention relates to an insulation structure for a doubly-fed induction generator (DFIG) in the field of motor insulation structures. The structure includes a motor body, within which a rotor and stator are mounted. A shaft is connected to the rotor. An end cover is installed at the end of the motor body, and an insulation assembly covering the rotor and stator is disposed within the end cover. The insulation assembly includes an inner insulating ring covering the rotor end face and an outer insulating ring covering the stator end face. The inner insulating ring is rotatably connected to the middle of the outer insulating ring. A rubber ring for sealing is fixedly connected to the outer end of the inner insulating ring. Multiple thermal expansion pillars inserted into the rotor are fixedly connected to the inner insulating ring. A limiting groove matching the thermal expansion pillars is formed at the end of the rotor, and the limiting groove is filled with a thermal expansion fluid. The insulation assembly enables dynamic and coordinated control of insulation protection and heat dissipation performance during DFIG operation, easily ensuring the insulation reliability, heat dissipation efficiency, and operational safety of the DFIG during operation.

Description

Technical Field

[0001] This invention relates to an insulation structure, and more particularly to an insulation structure for a doubly fed motor applied in the field of motor insulation structures. Background Technology

[0002] The existing insulation structure of doubly-fed induction generators mainly consists of stator insulation and rotor insulation. For stator insulation, slot insulation separates the stator windings from the core to prevent short circuits, typically using materials such as polyester film, which possesses good electrical properties and mechanical strength. Winding insulation insulates the winding wires, ensuring inter-turn and inter-phase insulation, often using mica tape, which has high heat resistance and electrical insulation. End insulation is used to fix and insulate the winding ends, preventing short circuits from contacting other components.

[0003] Chinese patent CN111917220B discloses an end cover insulation device for a permanent magnet synchronous motor, including a motor housing, a side plate fixedly connected to the side end of the motor housing, a connecting plate provided at the upper end of the side plate, an ear plate fixedly connected to the upper left side of the connecting plate, a positioning ring fixedly connected to the right side of the side plate, and a connecting ring provided in the middle of the positioning ring. This invention increases the safety of the motor by blocking the shaft and the motor housing from forming a closed circuit through double insulation, while avoiding damage to the insulation layer after long-term use.

[0004] Chinese patent CN110513396B discloses an insulating sealing end cover for a motor shaft bearing. This invention can be connected to the bearing seat with bolts through fixing holes to seal the bearing. Furthermore, six evenly spaced rings are vertically arranged on the circumferential edge of the shaft groove, and four evenly spaced insulating posts are arranged on the inner groove circumferential edge of the insulating cover, which can prevent electrical conduction through the shaft.

[0005] Traditional doubly-fed motor insulation structures are mostly static designs, making it difficult to achieve dynamic and coordinated control of insulation protection and heat dissipation performance. Existing insulation structures are prone to accelerated aging due to overheating, affecting the insulation reliability, heat dissipation efficiency, and operational safety of the motor. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing insulation structure is prone to accelerated aging due to overheating, which affects the insulation reliability, heat dissipation efficiency and operational safety of the motor.

[0007] To solve the above problems, the present invention provides an insulation structure for a doubly fed motor, including a motor body, a rotor and a stator installed inside the motor body, a rotating shaft connected to the rotor, an end cover installed at the end of the motor body, an insulation component covering the rotor and stator inside the end cover, a vent hole matching the rotating shaft in the middle of the end cover, and a sealing bearing for sealing the end cover and the rotating shaft installed in the vent hole.

[0008] The insulation assembly includes an inner insulating ring covering the rotor end face and an outer insulating ring covering the stator end face. The inner insulating ring is rotatably connected to the middle of the outer insulating ring. A rubber ring for sealing is fixedly connected to the outer end of the inner insulating ring. Multiple thermal expansion columns inserted into the rotor are fixedly connected to the inner insulating ring. The rotor end is provided with a limiting groove that matches the thermal expansion columns, and the limiting groove is filled with thermal expansion fluid. At least one pair of elastic electric extension columns are connected between the inner ring of the sealed bearing and the inner insulating ring. The telescopic end of the elastic electric extension column contacts the inner insulating ring. The elastic electric extension column releases when de-energized and retracts when energized.

[0009] An auxiliary component is installed at the top of the motor body. The auxiliary component includes a control box. A connecting beam is detachably connected to the side of the control box. An air duct connector and an electrical connector for connecting to the end cover are installed at the bottom of the connecting beam.

[0010] As a further supplement to this application, a detection post inserted into the stator is installed on the outer insulating ring, and a temperature sensor is installed on the detection post. A detection ring for detecting the temperature of the inner insulating ring is installed at the inner end of the outer insulating ring. Multiple temperature detection units are evenly distributed and facing the inner insulating ring at the inner end of the detection ring. Pressure detection units are evenly arranged on the surface of the detection ring.

[0011] As a further supplement to this application, the upper end of the end cover is equipped with a mating seat that matches the connecting beam and the air duct connector. The end cover is equipped with a data acquisition unit that is electrically connected to the mating seat. The outer end of the end cover is connected with two pairs of mating flanges that match the motor body. The outer insulating ring is equipped with mating posts that are electrically connected to the temperature sensor and the detection ring. The inner end of the end cover is connected with terminals that match the mating posts.

[0012] As a further supplement to this application, an air pump matching the connecting beam is installed inside the control box, and a gas tank for storing inert gas is connected to the air pump. A heat dissipation plate for cooling the gas tank is installed on the control box.

[0013] As a further supplement to this application, both the inner and outer insulating rings are equipped with multiple evenly distributed heat dissipation fins.

[0014] As a further supplement to this application, the flexible electric extension column includes a fixed cylinder, a movable column inserted into the fixed cylinder, a compression spring connected between the fixed cylinder and the movable column, an electromagnet and a permanent magnet respectively installed on the fixed cylinder and the movable column, a wiring slip ring connected between multiple flexible electric extension columns, and a rotary connector matching the wiring slip ring installed inside the end cover.

[0015] As a further supplement to this application, insulating components and end covers are installed at both ends of the motor body, and a sealing plug is installed in the middle of the end cover away from the auxiliary components. The connecting beams on the control box are configured as a pair and are connected to the two end covers respectively.

[0016] As a further supplement to this application, an auxiliary system is also included. The auxiliary system includes a control module, a monitoring module, an alarm module, and a data processing module. The control module is used to receive decision instructions from the data processing module and control the coordinated operation of each execution component. The monitoring module is used to collect the status parameters of the rotor and stator in real time and provide raw data for the data processing module to make decisions. The data processing module is used to receive the data collected by the monitoring module, process and analyze it, and generate control instructions for the control module. The alarm module is used to issue a warning when an abnormal state occurs in the insulation structure.

[0017] In summary, this solution achieves dynamic and coordinated control of insulation protection and heat dissipation performance during the operation of the doubly-fed motor through insulation components; under normal conditions, it achieves insulation isolation and passive heat dissipation at the stator and rotor ends; when the rotor overheats, the inner insulation ring automatically separates from it, and in conjunction with the inert gas circulation, it actively enhances convective heat dissipation and isolates the risk of oxidation; it easily ensures the insulation reliability, heat dissipation efficiency, and operational safety of the doubly-fed motor during operation. Attached Figure Description

[0018] Figure 1 This is a perspective view of the motor according to the first embodiment of this application;

[0019] Figure 2 This is an exploded view of the insulation structure according to the first embodiment of this application;

[0020] Figure 3 This is a perspective view of the back of the insulating component according to the first embodiment of this application;

[0021] Figure 4 This is a side sectional view of the first embodiment of this application;

[0022] Figure 5 for Figure 4 Schematic diagram of the structure at point A;

[0023] Figure 6 for Figure 4 Schematic diagram of the structure at point B;

[0024] Figure 7 This is a partial cross-sectional view of the inner insulating ring in the first embodiment of this application when it is away from the rotor;

[0025] Figure 8 This is a side sectional view of the second embodiment of this application;

[0026] Figure 9 This is a system block diagram of the third embodiment of this application.

[0027] Explanation of the labels in the diagram:

[0028] 1. Motor body; 11. Rotor; 12. Stator; 13. Shaft; 2. End cover; 21. Connecting seat; 22. Terminal block; 23. Rotary connector; 3. Insulation components; 31. Inner insulating ring; 311. Rubber ring; 312. Thermal expansion column; 32. Outer insulating ring; 4. Sealed bearing; 41. Elastic electric extension column; 411. Fixed cylinder; 412. Movable column; 413. Terminal slip ring; 5. Auxiliary components; 51. Control box; 52. Connecting beam. Detailed Implementation

[0029] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] Implementation method 1:

[0031] Figures 1-7 The diagram shows an insulation structure for a doubly fed motor, comprising a motor body 1, a rotor 11 and a stator 12 installed inside the motor body 1, a rotating shaft 13 connected to the rotor 11, and an end cover 2 installed at the end of the motor body 1. An insulation assembly 3 covering the rotor 11 and the stator 12 is provided inside the end cover 2. A vent hole matching the rotating shaft 13 is opened in the middle of the end cover 2, and a sealing bearing 4 for sealing the end cover 2 and the rotating shaft 13 is installed inside the vent hole. The sealing bearing 4 includes an outer ring fixedly connected to the inner wall of the vent hole and an inner ring fixedly connected to the rotating shaft 13. The inner ring rotates with the rotating shaft 13, and an extension surface covering the outer ring is provided on the inner ring.

[0032] In this embodiment, an insulating component 3 and a sealed bearing 4 are provided only on the end cover 2 on the side of the motor body 1 where the rotating shaft 13 is installed;

[0033] The insulation assembly 3 includes an inner insulating ring 31 covering the end face of the rotor 11 and an outer insulating ring 32 covering the end face of the stator 12. The inner insulating ring 31 is rotatably connected to the middle of the outer insulating ring 32. Both the inner insulating ring 31 and the outer insulating ring 32 are equipped with multiple evenly distributed heat dissipation fins.

[0034] A rubber ring 311 for sealing is fixedly connected to the outer end of the inner insulating ring 31. A plurality of thermal expansion columns 312 inserted into the rotor 11 are fixedly connected to the inner insulating ring 31. The end of the rotor 11 is provided with a limiting groove that matches the thermal expansion column 312, and the limiting groove is filled with a thermal expansion fluid. The thermal expansion fluid is selected by those skilled in the art from the prior art; for example, dimethyl silicone oil. The thermal expansion fluid expands when heated, thereby pushing the thermal expansion column 312 to move outward, so that the inner insulating ring 31 moves away from the rotor 11.

[0035] At least one pair of elastic electric extension columns 41 are connected between the inner ring of the sealed bearing 4 and the inner insulating ring 31. The elastic electric extension columns 41 are mounted on the extension surface, and the telescopic end of the elastic electric extension column 41 contacts the inner insulating ring 31. The elastic electric extension column 41 is released when de-energized and retracted when energized. The elastic electric extension column 41 specifically includes a fixed cylinder 411 mounted on the inner ring of the sealed bearing 4, a movable column 412 inserted into the fixed cylinder 411, and a compression spring connected between the fixed cylinder 411 and the movable column 412. An electromagnet and a permanent magnet are respectively mounted on the fixed cylinder 411 and the movable column 412. The compression spring is specifically located between the electromagnet and the permanent magnet. A wiring slip ring 413 is connected between multiple elastic electric extension columns 41. A rotary connector 23 matching the wiring slip ring 413 is installed in the end cover 2. The compression spring is used to make the movable column 412 exert a certain compressive force on the inner insulating ring 31 to prevent the inner insulating ring 31 from separating from the rotor 11 due to vibration. Both the fixed cylinder 411 and the movable column 412 are made of insulating material.

[0036] An auxiliary component 5 is installed at the top of the motor body 1. The auxiliary component 5 includes a control box 51. A connecting beam 52 is detachably connected to the side of the control box 51. An air duct connector and an electrical connector for connecting with the end cover 2 are installed at the bottom of the connecting beam 52. A mating seat 21 that matches the connecting beam 52 and the air duct connector is installed at the top of the end cover 2. A rotary connector 23 is electrically connected to the mating seat 21.

[0037] The control box 51 is equipped with an air pump that matches the connecting beam 52; and the air pump is connected to a gas tank that stores inert gas, and the control box 51 is equipped with a heat sink for cooling the gas tank.

[0038] In this embodiment, the air pump is configured as a suction and discharge air pump, and there are two air guide joints on the connecting beam 52. The suction and discharge air pump inputs and outputs protective gas into the space between the end cover 2 and the insulating component 3. The protective gas includes inert gas and cooling airflow. The suction and discharge air pump is provided with two input ends, which are used to introduce inert gas and external cooling airflow respectively.

[0039] The end cover 2 is equipped with a data acquisition unit that is electrically connected to the docking seat 21, and the data acquisition unit is connected to the sensor signal on the outer insulating ring 32. The outer end of the end cover 2 is connected to two pairs of docking flanges that match the motor body 1. The outer insulating ring 32 is equipped with docking posts that are electrically connected to the temperature sensor and the detection ring. The inner end of the end cover 2 is connected to a terminal block 22 that matches the docking post. The terminal block 22 is electrically connected to the data acquisition unit. The data acquisition unit is used to collect the signal transmitted by the terminal block 22 and transmit it to the docking seat 21.

[0040] A detection post inserted into the stator 12 is installed on the outer insulating ring 32, and a temperature sensor is installed on the detection post. A detection ring for detecting the temperature of the inner insulating ring 31 is installed on the inner end of the outer insulating ring 32. Multiple temperature detection units are evenly distributed and facing the inner insulating ring 31. The temperature detection units are used to detect the temperature of the inner insulating ring 31. Pressure detection units are evenly distributed on the surface of the detection ring. A rubber ring 311 covers the surface of the detection ring. The temperature sensor, pressure detection units, and temperature detection units all transmit data to the data acquisition unit through docking posts.

[0041] The inner insulating ring 31 is made of thermally conductive material; the temperature sensor on the detection column is used to detect the real-time temperature of the stator 12, and the pressure detection unit is used to detect the pressure of the inner insulating ring 31 on the detection ring.

[0042] In this design, during motor operation, the inner insulating ring 31 and the outer insulating ring 32 not only provide insulation protection but also assist in heat dissipation to ensure the stability of motor operation. Under normal working conditions, airflow is introduced into the end cover 2 through an air pump and exchanges heat with the heat dissipation fins on the inner insulating ring 31 and the outer insulating ring 32 to dissipate heat from the shaft 13, rotor 11 and stator 12.

[0043] When the rotor 11 overheats, the thermal expansion column 312 expands due to heat, causing the inner insulating ring 31 to move outward away from the rotor 11. At this time, the rotor 11 is exposed and directly exchanges heat with the external environment.

[0044] The control box 51 in the auxiliary component 5 is connected to the end cover 2 via the connecting beam 52, and the air duct connector and the electrical connector are respectively matched and connected to the docking seat 21;

[0045] After the inner insulating ring 31 is heated and moves away from the rotor 11, inert gas can be filled into the space between the end cover 2 and the insulating assembly 3 by an air pump to protect the exposed rotor 11, and the flowing inert gas cools the shaft 13 and the rotor 11.

[0046] This embodiment can achieve active insulation protection and rapid heat dissipation for the rotor 11 when it overheats. When the rotor 11 experiences an abnormal temperature rise due to overload or fault, the thermally expanding fluid in the limiting groove expands due to heat, generating pressure that pushes the thermal expansion column 312 outward, thereby causing the inner insulating ring 31 to move away from the end face of the rotor 11. This action not only increases the gap between the rotor 11 and the inner insulating ring 31, reducing heat conduction, but more importantly, it exposes the end of the rotor 11 directly to the cavity formed by the end cover 2 and the insulating component 3, improving its heat exchange efficiency with the external environment.

[0047] Simultaneously, the air pump inside the control box 51 starts, pumping inert protective gas, such as nitrogen or argon, into the space between the end cover 2 and the insulating assembly 3 through one of the air guide joints of the connecting beam 52 and the docking seat 21. The protective gas quickly fills the space created by the movement of the inner insulating ring 31, enveloping the exposed end of the rotor 11, effectively isolating oxygen and preventing high-temperature oxidation or potential electrical spark risks. Driven by the air pump, the inert gas forms a circulating flow, flowing over the high-temperature end face of the rotor 11, the shaft 13, and the heat dissipation fins of the inner and outer insulating rings 31 and 32, continuously absorbing heat. It is then extracted through another air guide joint, cooled by the gas tank and heat sink, and can be re-injected or partially discharged for renewal. This circulating airflow significantly enhances the convective cooling effect on key heat-generating components.

[0048] When the temperature of rotor 11 drops to a safe range, the thermally expanded fluid in the limiting groove contracts. At this time, a signal can be sent to the wiring slip ring 413 through the control box 51, so that the rotary connector 23 supplies power to the electromagnet of the elastic electric extension column 41. The electromagnet is energized and repels the permanent magnet, driving the movable end of the movable column 412 to push the inner insulating ring 31 to reset, re-fit tightly against the end face of rotor 11, and restore the original insulation state. The pressure detection unit can monitor the contact pressure between the inner insulating ring 31 and rotor 11 in real time to ensure that the reset is in place.

[0049] In addition, the temperature sensor installed on the detection column and the temperature detection unit on the detection ring continuously monitor the temperature changes of the stator 12 end face and the inner insulation ring 31. The data is transmitted to the data acquisition unit in the end cover 2 through the docking column and the terminal 22, and then fed back to the control box 51 through the electrical connector of the docking seat 21 and the connecting beam 52, providing real-time data support for the intelligent operation control and overheat protection decision of the system.

[0050] In summary, this solution achieves dynamic and coordinated control of insulation protection and heat dissipation performance during the operation of the doubly-fed motor through the insulation component 3; under normal conditions, it achieves end insulation isolation and passive heat dissipation between the stator 12 and the rotor 11; when the rotor 11 overheats, the inner insulation ring 31 automatically separates from it, and actively enhances convective heat dissipation and isolates the risk of oxidation in conjunction with the inert gas circulation; it is easy to ensure the insulation reliability, heat dissipation efficiency and operational safety of the doubly-fed motor during operation.

[0051] The second implementation method:

[0052] Figure 8 As shown, compared to the first embodiment, the difference is that: in this embodiment, the motor body 1 is equipped with an insulating component 3 and an end cover 2 at both ends, the end of the shaft 13 at the end cover 2 away from the auxiliary component 5 is connected to the motor fan blade, and the connecting beam 52 on the control box 51 is set as a pair and connected to the two end covers 2 respectively.

[0053] Both the rotor 11 and the stator 12 are provided with a number of evenly distributed vent holes, and the two ends of the vent holes are respectively opposite to the two end caps 2.

[0054] Compared to the first embodiment, in this embodiment, the air pump at the control box 51 is a circulating air pump, and the circulating air pump drives the inert gas to flow between the two end covers 2 and the rotor 11. The air guide joint on the connecting beam 52 is set to two and is connected to the docking seat 21 on the two end covers 2 respectively. After both ends of the rotating shaft 13 are overheated, the two inner insulating rings 31 are far away from the end face of the rotor 11. The inert gas output by the circulating air pump enters the vent hole from one end cover 2 and then flows out from the other end cover 2 back into the circulating air pump.

[0055] This embodiment achieves effective cooling and overheat protection inside the motor. Compared with the first embodiment, airflow enters the rotor 11 for heat exchange, which can easily accelerate the cooling rate of the rotor 11 and is suitable for use environments that require rapid cooling.

[0056] The third implementation method:

[0057] Figure 9 As shown, this solution also includes an auxiliary system, which includes a control module, a monitoring module, an alarm module, and a data processing module.

[0058] The control module is used to receive decision instructions from the data processing module and control the coordinated operation of each execution component;

[0059] Specific tasks include: controlling the start / stop and operation mode of the air pump, such as the introduction of normal cooling airflow, the injection and extraction of inert gas circulation when overheated, and the switching of airflow after the temperature recovers;

[0060] Controlling the on / off state of the flexible electric extension column 41: When the rotor temperature drops to a safe range, power is supplied to the electromagnet through the wiring slip ring 413 and the rotary connector 23, driving the movable column 412 to push the inner insulating ring 31 to reset;

[0061] The monitoring module is used to collect the status parameters of rotor 11 and stator 12 in real time, and provide raw data for the data processing module to make decisions. The data acquisition unit is connected to the monitoring module by signal. The data specifically includes: continuous monitoring of the real-time temperature of the end face of stator 12 through the temperature sensor on the detection column; real-time monitoring of the temperature data at the inner insulation ring 31 through the temperature detection unit, and the temperature data at the inner insulation ring 31 is used to calculate the temperature of rotor 11.

[0062] The data processing module is used to receive data collected by the monitoring module, process and analyze it, and generate control commands for the control module. Specific tasks include: comparing the temperature data of the stator 12 and inner insulating ring 31 collected by the temperature sensor with the preset safety threshold to determine whether the overheat protection mechanism is triggered; such as starting inert gas circulation for heat dissipation.

[0063] The contact pressure data collected by the pressure detection unit is analyzed to confirm the reset status of the inner insulating ring 31. If the pressure value is lower than the threshold, it is determined that the reset is not in place and feedback is sent to the control module for readjustment.

[0064] It processes auxiliary data such as the operating status of the air pump and the temperature of the inert gas circulation to optimize heat dissipation efficiency; for example, it adjusts the circulation airflow speed to match the real-time heat generation; and transmits the processed control commands corresponding to the decision results to the control module to drive the execution components to respond.

[0065] The alarm module is used to issue a warning when the insulation structure is in an abnormal state; specifically, when the temperature parameters collected by the monitoring module continue to exceed the safety threshold, such as the rotor / stator temperature exceeding the upper limit and still not decreasing after inert gas circulation, a high temperature alarm is triggered.

[0066] When the pressure detection unit displays an abnormal reset pressure of the inner insulating ring 31, such as being lower than the minimum contact pressure threshold, or when a power supply failure of the elastic electric extension column 41 causes it to fail to reset, a mechanical fault alarm is triggered, prompting maintenance personnel to check the status of the elastic electric extension column 41, compression spring, or electromagnet.

[0067] The auxiliary system of this embodiment realizes intelligent management of the insulation structure of the doubly fed motor. Through the collaborative work of multiple modules, it improves the motor's operational reliability and fault prevention capabilities. The auxiliary system strengthens the adaptive protection of the insulation structure and reduces the frequency of manual intervention, ensuring long-term stable operation of the doubly fed motor in industrial applications.

[0068] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. An insulation structure for a doubly-fed induction generator, comprising a motor body (1), wherein a rotor (11) and a stator (12) are installed inside the motor body (1), a rotating shaft (13) is connected to the rotor (11), and an end cover (2) is installed at the end of the motor body (1), characterized in that: The end cover (2) is provided with an insulating assembly (3) covering the rotor (11) and the stator (12). The end cover (2) has a vent hole in the middle that matches the shaft (13), and a sealing bearing (4) for sealing the end cover (2) and the shaft (13) is installed in the vent hole. The insulating assembly (3) includes an inner insulating ring (31) covering the end face of the rotor (11) and an outer insulating ring (32) covering the end face of the stator (12). The inner insulating ring (31) is rotatably connected to the middle of the outer insulating ring (32). A rubber ring (311) for sealing is fixedly connected to the outer end of the inner insulating ring (31). A plurality of thermal expansion columns (312) inserted into the rotor (11) are fixedly connected to the inner insulating ring (31). The end of the rotor (11) is provided with a limiting groove that matches the thermal expansion column (312), and the limiting groove is filled with thermal expansion fluid. At least one pair of elastic electric extension columns (41) are connected between the inner ring of the sealing bearing (4) and the inner insulating ring (31). The telescopic end of the elastic electric extension column (41) contacts the inner insulating ring (31). An auxiliary component (5) is installed at the top of the motor body (1). The auxiliary component (5) includes a control box (51). A connecting beam (52) is detachably connected to the side of the control box (51). An air connector and an electrical connector for connecting to the end cover (2) are installed at the bottom of the connecting beam (52). The outer insulating ring (32) is equipped with a detection column inserted into the stator (12), and a temperature sensor is installed on the detection column. The inner end of the outer insulating ring (32) is equipped with a detection ring for detecting the temperature of the inner insulating ring (31). The inner end of the detection ring is equipped with multiple temperature detection units that are evenly distributed and facing the inner insulating ring (31). Pressure detection units are evenly arranged on the surface of the detection ring. The upper end of the end cover (2) is equipped with a docking seat (21) that matches the connecting beam (52) and the air duct connector. The data acquisition unit that is electrically connected to the docking seat (21) is installed inside the end cover (2). The outer end of the end cover (2) is connected with two pairs of docking flanges that match the motor body (1). The outer insulating ring (32) is equipped with docking posts that are electrically connected to the temperature sensor and the detection ring. The inner end of the end cover (2) is connected with a terminal post (22) that matches the docking post.

2. The insulation structure of a doubly-fed insulated motor according to claim 1, characterized in that: The control box (51) is equipped with an air pump that matches the connecting beam (52), and the air pump is connected to a gas tank that stores inert gas. The control box (51) is equipped with a heat sink for heat dissipation of the gas tank.

3. The insulation structure of a doubly-fed insulated motor according to claim 1, characterized in that: The surfaces of both the inner insulating ring (31) and the outer insulating ring (32) are equipped with multiple evenly distributed heat dissipation fins.

4. The insulation structure of a doubly-fed insulated motor according to claim 1, characterized in that: The elastic electric extension column (41) includes a fixed cylinder (411), a movable column (412) is inserted into the fixed cylinder (411), a compression spring is connected between the fixed cylinder (411) and the movable column (412), an electromagnet and a permanent magnet are respectively installed on the fixed cylinder (411) and the movable column (412), a wiring slip ring (413) is connected between multiple elastic electric extension columns (41), and a rotary connector (23) matching the wiring slip ring (413) is installed in the end cover (2).

5. The insulation structure of a doubly-fed insulated motor according to claim 1, characterized in that: Insulating components (3) and end caps (2) are installed at both ends of the motor body (1). The connecting beams (52) on the control box (51) are set as a pair and connected to the two end caps (2) respectively.

6. The insulation structure of a doubly-fed insulated motor according to any one of claims 1-5, characterized in that: It also includes an auxiliary system, which includes a control module, a monitoring module, an alarm module, and a data processing module. The control module is used to receive decision instructions from the data processing module and control the coordinated operation of each execution component. The monitoring module is used to collect the status parameters of the rotor (11) and stator (12) in real time to provide raw data for the data processing module to make decisions. The data processing module is used to receive the data collected by the monitoring module, process and analyze it, and generate control instructions for the control module. The alarm module is used to issue a warning when the insulation structure is in an abnormal state.

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