A mine explosion-proof and intrinsically safe multi-winding high-voltage frequency conversion speed regulation integrated machine

Abstract

This invention relates to a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine, comprising an explosion-proof multi-winding permanent magnet motor, a variable frequency speed control unit, and an input filter unit. The variable frequency speed control unit is fixedly mounted on the top of the explosion-proof multi-winding permanent magnet motor via a water-cooled heat dissipation base plate at its bottom. The input filter unit is located on the non-drive end cap side of the explosion-proof multi-winding permanent magnet motor and is connected to the variable frequency speed control unit via an explosion-proof flange. Power is supplied via a power cable and a power cable inlet device into the power cable wiring cavity, and control signal lines are supplied via a control cable inlet device into the control wiring cavity. Compared with the prior art, this invention solves the problems of large equipment size, difficult heat dissipation, and low cost and reliability under high-voltage applications through high integration and structural optimization. It has the advantages of compact structure, efficient heat dissipation, high power density, and good safety, and is suitable for 10kV and 6kV high-voltage power supply locations in coal mines.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof electrical equipment for mining, specifically a multi-winding high-voltage variable frequency speed control integrated machine for mining that is both explosion-proof and intrinsically safe. Background Technology

[0002] With the continuous increase in the power of electrical equipment used in coal mines, the form of underground power supply has also undergone significant changes. From the early 380V and 660V voltage levels, it has gradually developed to 1140V and 3300V, and the high-voltage direct-drive power distribution mode has become widespread. In recent years, some large coal mining enterprises have begun to promote the solution of directly supplying power from 6kV and 10kV substations to the coal mining face, which will inevitably drive the evolution and development of permanent magnet variable frequency speed control integrated machine technology to a new round.

[0003] In common designs of high-voltage variable frequency speed control units, most solutions use an internal transformer to step down the 10kV input voltage to 3.3kV or 1.14kV, and then implement motor drive control based on a conventional low-voltage variable frequency drive topology. The advantage of this solution is that low-voltage variable frequency drive technology is mature and reliable, and it better suits the operating practices of coal mining enterprises, thus effectively reducing learning costs. However, its disadvantages are also significant: the internal dry-type transformer is large in size and generates high heat; its application in small and medium-sized coal mines is limited by the constraints of space in the working face and belt conveyor roadway. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine. Through high integration and structural optimization, it solves the problems of large equipment size, difficult heat dissipation, and low cost and reliability in high-voltage applications in the prior art. It has the advantages of compact structure, efficient heat dissipation, high power density and good safety, and can be applied to 10kV high-voltage power supply locations in coal mines.

[0005] To achieve the above objectives, a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine is designed, including an explosion-proof multi-winding permanent magnet motor 1, a variable frequency speed control unit 2, and an input filter unit 6. The bottom of the variable frequency speed control unit 2 is provided with a water-cooled heat dissipation substrate 10. The variable frequency speed control unit 2 is fixedly installed on the top of the explosion-proof multi-winding permanent magnet motor 1 through the water-cooled heat dissipation substrate 10. The input filter unit 6 is located on the non-drive end cap side of the explosion-proof multi-winding permanent magnet motor 1 and is connected to the variable frequency speed control unit 2 through an explosion-proof flange. The power supply is connected to the power cable wiring cavity 13 through the power cable introduction device 5 via a power cable cable, and the control signal line is connected to the control wiring cavity 3 through the control cable introduction device 4.

[0006] Furthermore, the power cable connection cavity 13 is located on the side of the frequency conversion speed control unit 2, the power cable introduction device 5 is located at the front end of the power cable connection cavity 13, and a main circuit explosion-proof terminal 14 is installed between the power cable connection cavity 13 and the input filter unit 6. The power cable enters the power cable connection cavity 13 through the power cable introduction device 5 and is connected to the input filter unit 6 through the main circuit explosion-proof terminal 14.

[0007] Furthermore, after the power cable is filtered by the input filter unit 6, it is connected to the rectifier unit in the variable frequency speed control unit 2 through the explosion-proof terminal 14 of the main circuit. Finally, the output terminal of the inverter unit of the variable frequency speed control unit 2 connects the drive power of the multi-independent winding to the explosion-proof multi-winding permanent magnet motor 1 through the motor explosion-proof terminal 11.

[0008] Furthermore, an explosion-proof terminal block 12 is arranged at the rear end of the control wiring cavity 3, and the control signal line is connected to the control wiring cavity 3 through the explosion-proof terminal block 12.

[0009] Furthermore, the water-cooled heat dissipation substrate 10 is provided with a frequency converter cooling water interface 9 on one side, which is connected to an external cooling pipe. The input filter unit 6 is provided with a filter unit cooling water interface 7 on one side. External cooling water flows into the flow channel inside the water-cooled heat dissipation substrate 10 through the frequency converter cooling water interface 9 and carries away the heat generated by the frequency converter speed control unit 2. The coolant flowing out of the frequency converter speed control unit 2 is connected to the filter unit cooling water interface 7 through a pipe and flows into the cooling water pipe inside the input filter unit 6 through the filter unit cooling water interface 7, carrying away the heat generated inside the input filter unit 6. The coolant flowing out of the input filter unit 6 is connected to the cooling water channel of the explosion-proof multi-winding permanent magnet motor 1 through the motor cooling water interface 8 and dissipates heat for the explosion-proof multi-winding permanent magnet motor 1, thereby forming a series integrated cooling circuit.

[0010] Furthermore, the variable frequency speed control unit 2 includes a rectifier unit, an energy storage unit, an inverter unit, and a control unit. The three-phase AC power supply is connected to the rectifier unit of the variable frequency speed control unit 2 through the explosion-proof terminal 14 of the main circuit, and is converted into DC power and stored in the energy storage unit. The energy storage unit is composed of multiple capacitors connected in parallel to form a component and then connected in series. After multiple sets of capacitor components are connected in series, the bus voltage is divided into multiple lower voltage segments. Through the operation of a corresponding number of multiple sets of inverter units, the independent windings of the explosion-proof multi-winding permanent magnet motor 1 are driven to generate magnetic fields with the same phase angle, thereby driving the rotor to work.

[0011] Furthermore, multiple inverter units are controlled by corresponding drive boards via fiber optic signals. The control signals of the drive boards are issued by the drive controller. At the same time, the drive controller, current sampling board, and voltage sampling board are all connected to the main control board. The external I / O signals and communication signals of the main control board are converted into intrinsically safe signal interfaces through optical coupling isolation and then led out to the control wiring cavity 3 through the explosion-proof terminal block 12, thereby realizing the access of intrinsically safe control signals.

[0012] Furthermore, the 10kV three-phase AC power supply is connected to the rectifier unit through the explosion-proof terminal 14 of the main circuit, and is converted into 15kV DC power and stored in the capacitor assembly. After the capacitor assembly is connected in series, the bus voltage is divided into three 5kV voltage segments, which drive the three independent windings of the explosion-proof multi-winding permanent magnet motor 1 through three sets of inverter units. Each voltage segment drives one set of inverter units to work, and the output of each set of inverter units is connected to the corresponding independent winding of the explosion-proof multi-winding permanent magnet motor 1, thereby driving the explosion-proof multi-winding permanent magnet motor 1 to work.

[0013] Furthermore, the three sets of inverter units are controlled by three sets of drive boards via fiber optic signals. The control signals of the drive boards are issued by the drive controller. The main control board is responsible for collecting current and voltage signals and interacting with an external host computer through a communication interface, thereby realizing precise vector control or direct torque control.

[0014] Compared with the prior art, the present invention has the following advantages: (1) High integration and compactness: The present invention integrates the motor, frequency converter and filter unit into one unit, eliminating the need for dry transformer to step down the voltage, greatly saving installation space, completely eliminating long cables between equipment, eliminating overvoltage and EMI conduction paths, and making the system simpler and more reliable.

[0015] (2) Innovative design of cooling water flow direction: The cooling water of this invention flows in the order of "frequency conversion unit → filter unit → motor", which makes full use of the cooling capacity of the cooling water, systematically solves the heat dissipation problem of the main heat-generating components, and improves the overall heat dissipation efficiency and power density.

[0016] (3) High-voltage high-power drive scheme: The present invention adopts the topology of “rectified capacitor series voltage division + multiple inverters to drive multi-winding motor”, which enables the use of low-voltage power devices to drive high-voltage motors, solves the cost and reliability problems brought about by high-voltage IGBTs, and is particularly suitable for 10kV voltage level in coal mines.

[0017] (4) High safety and easy maintenance: The invention meets the requirements of explosion-proof and intrinsic safety for mining. The power wiring and control wiring are designed in separate chambers, with a clear layout and convenient maintenance.

[0018] In summary, this invention provides a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine suitable for underground coal mines with explosive gas environments. By utilizing 10kV direct rectification technology, the phase-shifting transformer can be eliminated, significantly reducing the equipment size. The frequency conversion unit is located at the top of the motor, resulting in higher integration. For independent multi-winding motors, even if a winding experiences a short circuit or damage, it can be completely disconnected and operated at reduced capacity, maximizing production continuity. Through high integration and structural optimization, this invention solves the problems of large equipment size, difficult heat dissipation, and low cost and reliability in high-voltage applications found in existing technologies. It boasts advantages such as compact structure, efficient heat dissipation, high power density, and good safety, making it particularly suitable for 10kV high-voltage power supply locations in underground coal mines and worthy of widespread application. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the basic structure of an embodiment of the present invention; Figure 2 A schematic diagram of an integrated cooling water circuit interface has been added to the embodiments of the present invention; Figure 3 A cross-sectional view showing the internal cavity design for an embodiment of the present invention; Figure 4 This is a schematic diagram of the principle topology of an embodiment of the present invention.

[0020] In the diagram: 1. Explosion-proof multi-winding permanent magnet motor; 2. Variable frequency speed control unit; 3. Control wiring cavity; 4. Control cable entry device; 5. Power cable entry device; 6. Input filter unit; 7. Filter unit cooling water interface; 8. Motor cooling water interface; 9. Variable frequency unit cooling water interface; 10. Water-cooled heat dissipation base plate; 11. Motor explosion-proof terminal; 12. Explosion-proof terminal; 13. Power cable wiring cavity; 14. Main circuit explosion-proof terminal. Detailed Implementation

[0021] As attached Figure 1 To be continued Figure 4 As shown, this invention provides a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine, including an explosion-proof multi-winding permanent magnet motor 1, a variable frequency speed control unit 2, and an input filter unit 6. The bottom of the variable frequency speed control unit 2 is provided with a water-cooled heat dissipation substrate 10, and the variable frequency speed control unit 2 is fixedly installed on the top of the explosion-proof multi-winding permanent magnet motor 1 through the water-cooled heat dissipation substrate 10. The input filter unit 6 is located on the non-drive end cap side of the explosion-proof multi-winding permanent magnet motor 1 and is connected to the variable frequency speed control unit 2 through an explosion-proof flange. The power supply is connected to the power cable wiring cavity 13 through the power cable introduction device 5 via a power cable cable, and the control signal line is connected to the control wiring cavity 3 through the control cable introduction device 4.

[0022] The power cable connection cavity 13 is located on the side of the variable frequency speed control unit 2. The power cable introduction device 5 is located at the front end of the power cable connection cavity 13. A main circuit explosion-proof terminal 14 is installed between the power cable connection cavity 13 and the input filter unit 6. The power cable enters the power cable connection cavity 13 through the power cable introduction device 5 and is connected to the input filter unit 6 through the main circuit explosion-proof terminal 14. After being filtered by the input filter unit 6, the power cable is connected to the rectifier unit in the variable frequency speed control unit 2 through the main circuit explosion-proof terminal 14. Finally, the output terminal of the inverter unit of the variable frequency speed control unit 2 connects the multi-independent winding drive power supply to the explosion-proof multi-winding permanent magnet motor 1 through the motor explosion-proof terminal 11. An explosion-proof terminal 12 is arranged at the rear end of the control connection cavity 3. The control signal line is connected to the control connection cavity 3 through the explosion-proof terminal 12.

[0023] A water-cooled heat dissipation substrate 10 has a frequency converter cooling water interface 9 on one side, which is connected to an external cooling pipe. A filter unit cooling water interface 7 is provided on one side of the input filter unit 6. The core power devices in the frequency converter speed control unit 2 are mounted on the water-cooled heat dissipation substrate 10. External cooling water flows into the internal flow channel of the water-cooled heat dissipation substrate 10 through the frequency converter cooling water interface 9 and carries away the heat generated by the frequency converter speed control unit 2. The coolant flowing out of the frequency converter speed control unit 2 is connected to the filter unit cooling water interface 7 through a pipe and flows into the cooling water pipe inside the input filter unit 6 through the filter unit cooling water interface 7, carrying away the heat generated in the input filter unit 6. Finally, the coolant flowing out of the input filter unit 6 is connected to the cooling water channel of the explosion-proof multi-winding permanent magnet motor 1 through the motor cooling water interface 8 and dissipates heat for the explosion-proof multi-winding permanent magnet motor 1, thereby forming a series integrated cooling circuit.

[0024] The variable frequency speed control unit 2 includes a rectifier unit, an energy storage unit, an inverter unit, and a control unit. The three-phase AC power supply is connected to the rectifier unit of the variable frequency speed control unit 2 through the explosion-proof terminal 14 of the main circuit, and is converted into DC power and stored in the energy storage unit. The energy storage unit is composed of multiple capacitors connected in parallel and then connected in series. After multiple sets of capacitors are connected in series, the bus voltage is divided into multiple lower voltage segments. Through the operation of a corresponding number of inverter units, the independent windings of the explosion-proof multi-winding permanent magnet motor 1 are driven to generate magnetic fields with the same phase angle, thereby driving the rotor to work. The multiple inverter units are controlled by corresponding drive boards through fiber optic signals. The control signals of the drive boards are issued by the drive controller. At the same time, the drive controller, current sampling board, and voltage sampling board are all connected to the main control board. The external I / O signals and communication signals of the main control board are converted into intrinsically safe signal interfaces through optical coupling isolation and then led out to the control wiring cavity 3 through the explosion-proof terminal 12, thereby realizing the access of intrinsically safe control signals.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: A mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine includes an explosion-proof multi-winding permanent magnet motor, a variable frequency speed control unit, and an input filter unit. The variable frequency speed control unit is mounted on top of the explosion-proof multi-winding permanent magnet motor via a water-cooled heat dissipation plate at its bottom. The input filter unit is located on the end cover side of the explosion-proof multi-winding permanent magnet motor and is connected to the variable frequency speed control unit via an explosion-proof flange, forming a compact mechanical unit. Power is introduced into the power cable terminal cavity located on the side of the variable frequency speed control unit through a power cable introduction device and connected to the input filter unit through the main circuit explosion-proof terminal. After being filtered by the input filter unit (such as an input reactor), the cable is then connected to the rectifier unit in the variable frequency speed control unit through the main circuit explosion-proof terminal. The inverter unit output of the variable frequency speed control unit connects the drive power of multiple independent windings to the explosion-proof multi-winding permanent magnet motor through the motor explosion-proof terminal.

[0026] The core power devices within the variable frequency speed control unit are mounted on a water-cooled heat dissipation substrate. The cooling water circuit is designed as follows: external cooling water first flows in through the variable frequency cooling water interface, cools the variable frequency speed control unit, and then flows out through the filter unit cooling water interface to carry away the heat generated in the input filter unit. Finally, the cooling water flows in through the motor cooling water interface to dissipate heat from the motor, thus forming an integrated cooling circuit that is either connected in series or distributed.

[0027] The variable frequency speed control unit includes a rectifier unit D, an energy storage unit C (capacitor), an inverter unit S, and a control unit, as shown in the attached diagram. Figure 4 As shown; taking a 10kV high-voltage application as an example, a 10kV three-phase AC power supply is connected to the rectifier unit D of the variable frequency speed control unit 2 through the explosion-proof terminal 14 of the main circuit, becoming 15kV DC power and storing energy in the capacitor assembly. After the capacitor assembly is connected in series, the bus voltage is divided into multiple lower voltage segments (for example, into three 5kV voltage segments). Through the operation of three sets of inverter units S, the three independent 3.3kV windings of the explosion-proof multi-winding permanent magnet motor 1 are driven to generate magnetic fields with the same phase angle, thereby driving the rotor to work. Each voltage segment drives one set of inverter units to work, and the output of each set of inverter units is connected to the corresponding independent winding of the explosion-proof multi-winding permanent magnet motor. Through coordinated control, the motor is driven to work.

[0028] The signal link of the control system is as follows: the three sets of inverter units S are controlled by the corresponding three sets of drive boards through optical fiber signals. The control signals of the drive boards are issued by the drive controller. At the same time, the drive controller, current sampling board and voltage sampling board are all connected to the main control board. The external I / O signals and communication signals of the main control board are converted into intrinsically safe signal interfaces through optical coupling isolation. They can be led out to the independent control wiring cavity 3 through the explosion-proof terminal 12 to realize the access of intrinsically safe control signals.

[0029] As attached Figure 1As shown, the basic structure of the present invention includes an explosion-proof multi-winding permanent magnet motor 1, a variable frequency speed control unit 2, and an input filter unit 6. The variable frequency speed control unit 2 is fixed to the top of the motor through its bottom mounting surface. The input filter unit 6 is located on the non-drive end cover side of the motor and is firmly connected to the side of the variable frequency speed control unit 2 through an explosion-proof flange to form a rigid whole. The power cable is connected through the power cable introduction device 5, and the control signal line is connected to the independent control wiring cavity 3 through the control cable introduction device 4.

[0030] As attached Figure 2 The diagram illustrates the integrated cooling water circuit. The water-cooled heat dissipation substrate 10 serves as the heat dissipation base for the variable frequency drive unit 2. External cooling pipes first connect to the variable frequency unit's cooling water interface 9, allowing coolant to flow into the internal channels of the water-cooled heat dissipation substrate 10, carrying away heat from the variable frequency power devices (such as IGBTs). The coolant flowing out of the variable frequency unit then connects to the filter unit's cooling water interface 7 via pipes, flowing into the cooling structure (such as cooling water pipes) inside the input filter unit 6 to dissipate heat from components such as reactors. Finally, the coolant flows out of the filter unit and connects to the motor's cooling water channels (such as the housing water jacket or stator winding cooling pipes) through the motor cooling water interface 8 to dissipate heat from the motor. This series cooling design achieves tiered utilization of the coolant, optimizing heat dissipation efficiency.

[0031] As attached Figure 3 The diagram illustrates the electrical connection path. The high-voltage power supply enters the power cable wiring chamber 13 via the power cable introduction device 5, and is connected to the input filter unit 6 and the rectifier unit via the main circuit explosion-proof terminal 14. The output of the inverter unit is connected to the three independent windings of the motor via the motor explosion-proof terminal 11, and the control signal line is connected to the control wiring chamber 3 via the explosion-proof terminal 12.

[0032] As attached Figure 4 The control logic is described in the diagram. The drive controller issues commands, which are transmitted via optical fiber to three drive boards, each controlling one of the three inverter units S. The main control board is responsible for acquiring current and voltage signals and interacting with an external host computer through a communication interface to achieve precise vector control or direct torque control.

[0033] In summary, this invention discloses a mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine, belonging to the technical field of mine explosion-proof electrical equipment. This integrated machine includes an explosion-proof multi-winding permanent magnet motor, a variable frequency speed control unit, and an input filter unit. The variable frequency speed control unit is mounted on top of the motor via a water-cooled heat dissipation base plate at its bottom. The input filter unit is located on the motor end cover side and connected to the variable frequency speed control unit via an explosion-proof flange, forming a compact whole. The core of this invention's technical solution lies in adopting an electrical topology of "10kV direct rectification + capacitor series voltage division + multiple inverters driving the multi-winding motor," eliminating the need for a built-in transformer and using a series integrated cooling water circuit (flowing in the order of "variable frequency unit → filter unit → motor") for heat dissipation. Through high integration and structural optimization, this invention solves the problems of large equipment size, difficult heat dissipation, and low cost and reliability in high-voltage applications in existing technologies. It has advantages such as compact structure, efficient heat dissipation, high power density, and good safety, and is particularly suitable for 10kV high-voltage power supply locations in coal mines.

[0034] The contents not described in detail in this specification are existing technologies known to those skilled in the art. The standard parts used can be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0035] This invention is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this invention shall be considered equivalent substitutions and shall be included within the scope of protection of this invention.

Claims

1. A mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine, characterized in that: The device includes an explosion-proof multi-winding permanent magnet motor (1), a variable frequency speed control unit (2), and an input filter unit (6). The variable frequency speed control unit (2) is provided with a water-cooled heat dissipation substrate (10) at its bottom. The variable frequency speed control unit (2) is fixedly installed on the top of the explosion-proof multi-winding permanent magnet motor (1) through the water-cooled heat dissipation substrate (10). The input filter unit (6) is located on the non-drive end cap side of the explosion-proof multi-winding permanent magnet motor (1) and is connected to the variable frequency speed control unit (2) through an explosion-proof flange. The power supply is connected to the power cable wiring cavity (13) through the power cable introduction device (5) via the power cable. The control signal line is connected to the control wiring cavity (3) through the control cable introduction device (4).

2. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 1, characterized in that: The power cable connection cavity (13) is located on the side of the variable frequency speed control unit (2). The power cable introduction device (5) is located at the front end of the power cable connection cavity (13). The power cable connection cavity (13) and the input filter unit (6) are equipped with a main circuit explosion-proof terminal (14). The power cable enters the power cable connection cavity (13) through the power cable introduction device (5) and is connected to the input filter unit (6) through the main circuit explosion-proof terminal (14).

3. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 2, characterized in that: After being filtered by the input filter unit (6), the power cable is connected to the rectifier unit in the variable frequency speed control unit (2) through the explosion-proof terminal (14) of the main circuit. Finally, the output of the inverter unit of the variable frequency speed control unit (2) is connected to the multi-winding drive power supply of the explosion-proof multi-winding permanent magnet motor (1) through the motor explosion-proof terminal (11).

4. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 1, characterized in that: The control wiring cavity (3) is provided with an explosion-proof terminal (12) at its rear end, and the control signal line is connected to the control wiring cavity (3) through the explosion-proof terminal (12).

5. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 1, characterized in that: The water-cooled heat dissipation substrate (10) is provided with a frequency converter cooling water interface (9) on one side. The frequency converter cooling water interface (9) is connected to an external cooling pipe. The input filter unit (6) is provided with a filter unit cooling water interface (7) on one side. External cooling water flows into the flow channel inside the water-cooled heat dissipation substrate (10) through the frequency converter cooling water interface (9) and carries away the heat generated by the frequency converter speed control unit (2). The coolant flowing out of the frequency converter speed control unit (2) is connected to the filter unit cooling water interface (7) through a pipe and flows into the cooling water pipe inside the input filter unit (6) through the filter unit cooling water interface (7) and carries away the heat generated inside the input filter unit (6). The coolant flowing out of the input filter unit (6) is connected to the cooling water channel of the explosion-proof multi-winding permanent magnet motor (1) through the motor cooling water interface (8) and dissipates heat for the explosion-proof multi-winding permanent magnet motor (1), thereby forming a series integrated cooling circuit.

6. The mine explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in any one of claims 1 to 5, characterized in that: The variable frequency speed control unit (2) includes a rectifier unit, an energy storage unit, an inverter unit and a control unit. The three-phase AC power supply is connected to the rectifier unit of the variable frequency speed control unit (2) through the explosion-proof terminal (14) of the main circuit, and is converted into DC power and stored in the energy storage unit. The energy storage unit is composed of multiple capacitors connected in parallel to form a component and then connected in series. After multiple sets of capacitor components are connected in series, the bus voltage is divided into multiple lower voltage segments. Through the operation of a corresponding number of multiple sets of inverter units, the independent windings of the explosion-proof multi-winding permanent magnet motor (1) are driven to generate magnetic fields with the same phase angle, thereby driving the rotor to work.

7. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 6, characterized in that: Multiple inverter units are controlled by corresponding drive boards via fiber optic signals. The control signals of the drive boards are issued by the drive controller. At the same time, the drive controller, current sampling board, and voltage sampling board are all connected to the main control board. The external I / O signals and communication signals of the main control board are converted into intrinsically safe signal interfaces through optical coupling isolation and then led out to the control wiring cavity (3) through explosion-proof wiring terminals (12), thereby realizing the access of intrinsically safe control signals.

8. The mine explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 6, characterized in that: A 10kV three-phase AC power supply is connected to the rectifier unit through the explosion-proof terminal (14) of the main circuit, and is converted into 15kV DC power and stored in the capacitor assembly. After the capacitor assembly is connected in series, the bus voltage is divided into three 5kV voltage segments, which drive the three independent windings of the explosion-proof multi-winding permanent magnet motor (1) through three sets of inverter units. Each voltage segment drives one set of inverter units to work, and the output of each set of inverter units is connected to the corresponding independent winding of the explosion-proof multi-winding permanent magnet motor (1), thereby driving the explosion-proof multi-winding permanent magnet motor (1) to work.

9. The mine-use explosion-proof and intrinsically safe multi-winding high-voltage variable frequency speed control integrated machine as described in claim 8, characterized in that: The three sets of inverter units are controlled by three sets of driver boards via fiber optic signals. The control signals of the driver boards are issued by the drive controller. The main control board is responsible for collecting current and voltage signals and interacting with an external host computer through a communication interface, thereby realizing precise vector control or direct torque control.

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