Electric barring device and method based on rotor position positioning

Abstract

The invention discloses an electric barring device and method based on rotor position positioning, which are used for solving the problems of rotor reverse rotation and accurate position control during generator overhauling barring. The device comprises a position detection mechanism, a turning control host and a rotor and stator control system, the position detection mechanism adopts an absolute value encoder device, and the rotation angle of a rotor is detected in real time through tangent installation of an encoder guide wheel and a large shaft. And the turning control host receives the angle data, and calls a preset algorithm to calculate the stator current phase sequence, magnitude and predicted rotation angle in combination with the generator parameters, thereby preventing the rotor from rotating reversely. And the control host transmits an instruction to the rotor and stator control system, adjusts current to drive the rotor to rotate, and corrects the position deviation of the rotor in real time through closed-loop control until a predetermined target is reached. According to the method, high-precision control over the rotor position is achieved, the positioning precision reaches the arc second level, the turning data validity and the overhaul efficiency are effectively improved, a traditional turning structure is simplified, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of electric turning gear technology for hydro-generators, and specifically relates to an electric turning gear device and method based on rotor position positioning. Background Technology

[0002] The core shortcomings of existing electric turning gear technology are as follows: First, the risk of rotor reversal is high. Due to the lack of precise detection of the rotor's initial position, the relative position of the rotor and the stator magnetic field is uncertain at the moment the stator current is applied, making it highly susceptible to reverse rotation due to reverse electromagnetic force. Since the bearings are tightly fitted to the shaft during rotation, frequent reversals can cause bearing misalignment, rendering the rotor's X and Y direction runout data invalid. This forces maintenance personnel to repeatedly adjust the rotor, significantly extending maintenance cycles and increasing labor costs. Second, the position control precision is insufficient. Traditional turning gear systems often use low-precision sensors or open-loop control modes, which cannot provide real-time feedback on rotor position. This makes it difficult to meet the stringent requirements of modern generator maintenance for rotor positioning precision (such as arcsecond-level precision), resulting in large shaft adjustment errors and affecting generator operational stability. Third, the system structure is complex. Traditional devices rely on mechanical transmission components such as gearboxes and couplings for power transmission, which not only increases the equipment failure rate but also leads to cumbersome installation and disassembly processes, further reducing maintenance efficiency. Summary of the Invention The technical problem to be solved by the present invention is to provide an electric turning gear device and method based on rotor position positioning, which achieves precise control of rotor position through high-precision position detection and intelligent control algorithm, avoids reverse rotation, and improves maintenance efficiency and quality.

[0003] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An electric turning gear device based on rotor position positioning includes a position detection mechanism, which is electrically connected to a turning gear control host, and the turning gear control host is electrically connected to a rotor-stator control system. The position detection mechanism is used to detect the rotor rotation angle and transmit the rotor rotation angle data to the turning gear control host. The aforementioned turning gear control host is used to collect rotor rotation angle data, and then locate the rotor's real-time position; The turning gear control host sends control signals to the rotor-stator control system, which adjusts the current magnitude and on-time of the rotor and stator to adjust their relative positions.

[0004] Preferably, the position detection mechanism is an absolute encoder device, which includes an encoder guide wheel and an absolute encoder. The absolute encoder has an SSI sensor built in, which is electrically connected to the turning gear control host. The SSI sensor is used to detect the number of revolutions of the encoder guide wheel and transmit the number of revolutions of the encoder guide wheel to the turning gear control host. The turning gear control host converts the number of revolutions of the encoder guide wheel and the circumference of the encoder guide wheel into the rotor rotation angle. Preferably, the encoder guide wheel is installed tangentially to the outer circle of the rotor shaft, ensuring that the encoder guide wheel and the rotor shaft rotate synchronously.

[0005] Preferably, the absolute encoder device further includes a support frame, one end of which is connected to the encoder guide wheel and the absolute encoder, and the other end is connected to the magnetic mounting base.

[0006] Preferably, the encoder guide wheel is coaxially fixed with the shaft of the absolute encoder.

[0007] Preferably, the magnetic mounting base is used to attach to the generator housing, and the support frame is a flexible telescopic frame.

[0008] Preferably, the turning gear control host is a PLC controller.

[0009] A turning method for an electric turning gear based on rotor position positioning includes the following steps: S1: At the generator maintenance site, the wheel of the position detection mechanism is installed tangentially to the outer circle of the generator shaft and fixed by the support frame and magnetic mounting base to ensure that the wheel and the coaxial absolute encoder can rotate synchronously when the shaft rotates. Start the electric turning gear device and perform a power-on self-test on the absolute encoder and SSI sensor, the turning gear control host and the rotor stator control system to confirm that the communication of each component is normal and that there are no abnormalities in the operation status. The pre-stored generator parameters are retrieved and confirmed in the turning gear control host. The generator parameters include the number of stator winding turns, the number of pole pairs, and the rated current. S2: The absolute encoder and SSI sensor start working, detecting the initial position of the generator rotor, converting the wheel rotation angle and number of revolutions into electrical signals, and transmitting them to the turning gear control host through the shielded cable; After receiving the signal, the turning control host calculates the initial rotation angle of the generator shaft based on the wheel circumference and encoder resolution, and stores the initial position data. S3: The turning gear control host calculates the initial rotor position based on the received rotor position information and the retrieved generator parameters by calling the internal preset algorithm. The algorithm calculates the phase sequence of the stator current to ensure that the rotor rotates in the predetermined direction and avoids reverse rotation at the current rotor position. This determines the energizing sequence, current magnitude, and expected rotation angle of the three phases A, B, and C. S4: The turning gear control host outputs control signals to the rotor-stator control system based on the calculation results, directly controlling the phase sequence and magnitude of the stator current. The stator windings are fed with current of a specific phase sequence and magnitude according to the PLC instructions, generating an electromagnetic field. The electromagnetic field is used to drive the generator rotor to start rotating in a predetermined direction. S5: During the rotor rotation process, the absolute encoder monitors the rotor position change in real time and continuously feeds back the real-time rotor position information to the turning gear control host. The turning gear control host compares the real-time rotor position information with the predetermined position and calculates the position deviation; If a deviation exists, the turning gear control host immediately adjusts the control parameters of the stator current, including changing the current phase sequence and adjusting the current magnitude, to correct the rotation direction and speed of the rotor and achieve closed-loop precise control of the rotor position. Repeat the above monitoring, comparison, and adjustment process until the rotor position reaches the predetermined target position for turning.

[0010] Preferably, in S1, the initial position data of the generator main shaft is obtained by counting the number of revolutions of the encoder guide wheel. With guide wheel circumference Large axis radius Convert the initial angle: ; in, Initial angle of the generator shaft; Initial number of revolutions of the encoder guide wheel; : Encoder guide wheel circumference; : Generator shaft radius.

[0011] Preferably, in S2, the rotor angle conversion formula is: The main control unit of the turning gear controls the number of rotations of the guide wheel. With the initial number of laps Combined with the guide wheel circumference and major axis radius Calculate the real-time rotor angle : ; : Real-time rotor angle (rad); : The initial angle (rad) calculated in S1; : The number of guide wheel turns detected in real time; : Guide wheel circumference; : Radius of the major axis.

[0012] Preferably, in S2, a three-point moving average filter is used to process the data from three consecutive samplings. The filtered angle is: ; Required angle fluctuation range after filtering: ; in .

[0013] Preferably, in S2, the rotor rotation angle is verified using the following method: Drive the main shaft to rotate Record encoder feedback angle Calculate the deviation: ; like The guide wheel clamping force needs to be adjusted or the contact surface cleaned until the accuracy requirements are met. When the guide wheel is tangent to the main shaft, the displacement of the main shaft surface corresponding to the number of rotations of the guide wheel is: According to the arc length formula Angles can be obtained This achieves a linear conversion from mechanical displacement to angle, with the main source of error being: ; in, For displacement measurement error, This represents the measurement error of the large shaft radius.

[0014] Preferably, in S3, the three-phase current phase sequence control method is as follows: ① Determining the direction of rotation: Assuming the target rotates clockwise, the initial position of the rotor satisfies: When the three-phase current conduction sequence is determined to be A→B→C; if counterclockwise rotation is required, the phase sequence is C→B→A.

[0015] ② On-time calculation: Based on the target rotation angle (Unit: rad), the conduction time of each phase current is: ; Single-phase conduction time (s); Current frequency (Hz, 50Hz for power frequency); Number of magnetic pole pairs.

[0016] The present invention can achieve the following beneficial effects: This invention uses an absolute encoder and an SSI sensor to accurately detect the initial rotor position in real time. Based on the rotor position and generator parameters, the turning gear control unit uses a preset algorithm to calculate the phase sequence, magnitude, and expected rotation angle of the stator current, thus fundamentally avoiding rotor reversal caused by improper current input. This prevents bearing misalignment due to reversal, ensures the validity of rotor X and Y direction runout data, reduces repetitive adjustments, significantly improves maintenance efficiency, and lowers time and labor costs caused by data failure.

[0017] This invention employs a high-precision absolute encoder and SSI sensor, combined with a tangential transmission design between the guide wheel and the main shaft, to control the rotor position detection accuracy at the arcsecond level. The turning gear control host, through a closed-loop control strategy, compares the actual rotor position with the predetermined position in real time, dynamically adjusts the stator current parameters, and achieves precise correction of the rotor position. This meets the high-precision requirements of modern generator maintenance for rotor positioning, effectively ensuring the accuracy of generator shaft adjustment and improving equipment operational stability.

[0018] This invention eliminates the complex mechanical transmission components such as gearboxes and couplings found in traditional turning gears, directly driving the rotor to rotate through electromagnetic fields, thus reducing potential mechanical failure points. Simultaneously, the position detection mechanism employs a magnetic mounting base and a flexible telescopic frame design, facilitating rapid on-site installation and disassembly, reducing equipment maintenance difficulty and frequency, extending the device's service life, and significantly lowering overall maintenance costs. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is an installation layout diagram of the electric turning wheel device of the present invention; Figure 2 This is a structural diagram of the absolute encoder device of the present invention; Figure 3 This is a flowchart of the method of the present invention.

[0020] In the figure: Absolute encoder device 1, encoder guide wheel 101, magnetic mounting base 102, support frame 103, turning control host 2, rotor and stator control system 3, main shaft 4. Detailed Implementation

[0021] Preferred solutions include Figures 1 to 3As shown, an electric turning gear device based on rotor position positioning includes a position detection mechanism, which is electrically connected to the turning gear control host, and the turning gear control host is electrically connected to the rotor-stator control system. The position detection mechanism is used to detect the rotor rotation angle and transmit the rotor rotation angle data to the turning gear control host. The aforementioned turning gear control host is used to collect rotor rotation angle data, and then locate the rotor's real-time position; The turning gear control host sends control signals to the rotor-stator control system, which adjusts the current magnitude and on-time of the rotor and stator to adjust their relative positions.

[0022] The position detection mechanism, as a front-end sensing unit, detects the rotor rotation angle in real time, converts the mechanical displacement signal into an electrical signal, and transmits it to the turning gear control host through a shielded cable.

[0023] The aforementioned turning gear control host, as the core computing unit, receives angle data from the position detection mechanism, analyzes the real-time rotor position through a built-in algorithm, and generates a control strategy by combining the inherent parameters of the generator (such as stator winding structure, number of pole pairs, etc.).

[0024] The rotor-stator control system, acting as an execution unit, receives commands from the turning gear control host, precisely adjusts the current magnitude and on-time of the rotor and stator, and adjusts the relative position of the rotor and stator through electromagnetic field interaction to achieve the turning gear action. In this embodiment, the rotor-stator control system is the power plant's own operating system, such as a DCS.

[0025] Furthermore, the position detection mechanism is an absolute encoder device, which includes an encoder guide wheel and an absolute encoder. The absolute encoder has a built-in SSI sensor, which is electrically connected to the turning gear control host. The SSI sensor is used to detect the number of revolutions of the encoder guide wheel and transmit the number of revolutions of the encoder guide wheel to the turning gear control host. The turning gear control host converts the number of revolutions of the encoder guide wheel and the circumference of the encoder guide wheel into the rotor rotation angle.

[0026] In an absolute encoder device, the encoder guide wheel serves as a mechanical transmission component, directly contacting the rotor shaft. The absolute encoder incorporates an SSI (Synchronous Serial Interface) sensor, enabling high-precision position detection. The SSI sensor's operating logic is as follows: by detecting the number of rotations of the encoder guide wheel and combining this with the guide wheel's circumference, a formula is used to convert the rotation count signal into the actual rotation angle of the rotor, achieving a positioning accuracy at the arcsecond level.

[0027] Furthermore, the encoder guide wheel is installed tangentially to the outer circle of the rotor shaft, ensuring that the encoder guide wheel and the rotor shaft rotate synchronously. The encoder guide wheel maintains tangential contact with the outer circle of the rotor shaft, ensuring that the guide wheel rotates synchronously through friction when the shaft rotates, avoiding slippage (slippage rate must be ≤0.02%).

[0028] By adjusting the contact pressure between the guide wheel and the main shaft (usually maintained at 50-80N) and using wear-resistant materials to make the guide wheel, the reliability of the mechanical transmission is ensured.

[0029] Furthermore, the absolute encoder device also includes a support frame, one end of which is connected to the encoder guide wheel and the absolute encoder, and the other end is connected to the magnetic mounting base.

[0030] The support frame features a rigid structure design, with one end securing the encoder guide wheel and the coaxial assembly of the absolute encoder, while the other end allows for quick installation via a magnetic mounting bracket. The magnetic mounting bracket can be directly fixed to metal surfaces such as the generator housing using magnetic adsorption, eliminating the need for additional drilling or welding, facilitating rapid deployment and disassembly during on-site maintenance.

[0031] Furthermore, the encoder guide wheel is fixed coaxially with the shaft of the absolute encoder.

[0032] Precision requirements for coaxial fixing: The encoder guide wheel is coaxially connected to the shaft of the absolute encoder through a flexible coupling or rigid flange, with a coaxiality error ≤0.05mm. This ensures that the encoder synchronously and without bias collects the number of revolutions when the guide wheel rotates, avoiding mechanical transmission errors from affecting the position detection accuracy.

[0033] Furthermore, the magnetic mounting base is used to attach to the generator's casing, and the support frame is a flexible telescopic frame.

[0034] Technical parameters of the magnetic mounting base: It adopts neodymium iron boron permanent magnet material with an adsorption force of ≥500N to ensure that the device does not shift during the rotation process; it is equipped with an anti-slip pad design to prevent the metal contact surface from sliding.

[0035] The adjustment mechanism of the elastic telescopic frame: The support frame adopts a spring damping structure, which can extend and retract axially (adjustment range 0-50mm) to adapt to generator shafts of different diameters. It also automatically maintains constant pressure between the guide wheel and the shaft through elastic force to compensate for the runout error of the shaft surface.

[0036] Furthermore, the main control unit for the turning gear is a PLC controller. An industrial-grade PLC (such as the Siemens S7-1200 series) is selected, which has high-speed data processing capabilities and anti-interference performance, supports the SSI communication protocol, can receive position detection data in real time and execute anti-reverse algorithm, and output precise current control commands.

[0037] A turning method for an electric turning gear based on rotor position positioning includes the following steps: S1: At the generator maintenance site, first select a position detection mechanism of appropriate specifications based on the diameter of the generator shaft and the installation space. Install the wheels of the position detection mechanism tangentially to the outer circumference of the generator shaft, and fix it using a support frame and magnetic mounting base. The support frame has an adjustable telescopic length to accommodate different installation height requirements and is secured with bolts or clips. The magnetic mounting base uses strong magnetic attraction to adhere to the flat metal surface of the generator housing. After installation, manually shake it to check stability, ensuring that the shaft rotation drives the wheels and the coaxial absolute encoder to rotate synchronously without slippage or offset.

[0038] After completing the mechanical installation, turn on the power switch of the electric turning gear. At this time, the system automatically performs a power-on self-test on the absolute encoder and SSI sensor, the turning gear control host, and the rotor-stator control system. During the self-test, indicator lights on each device will illuminate or flash according to a preset program, displaying the equipment's operating status. Simultaneously, the system automatically sends test signals to check the communication lines between components, such as whether the data transmission between the absolute encoder and the turning gear control host is normal, and whether the command transmission and reception between the turning gear control host and the rotor-stator control system are accurate. Only when all components communicate normally and there are no abnormal operating status indications will the next step be performed.

[0039] On the operating interface of the turning gear control host, the pre-stored generator parameters can be retrieved through the human-machine interaction system. The generator parameters mainly include key data such as the number of stator winding turns, the number of magnetic pole pairs, and the rated current.

[0040] S2: Once the system self-test is complete and the generator parameters are confirmed to be correct, the absolute encoder and SSI sensor begin their formal operation. With the slight rotation of the generator rotor, the wheel coaxially connected to it rotates. During wheel rotation, the absolute encoder and SSI sensor collect information on the wheel's rotation angle and number of revolutions, converting this information into electrical signals. To prevent signal interference, the collected electrical signals are transmitted to the turning gear control host via a shielded cable. Both ends of the shielded cable must be reliably grounded to ensure the stability and accuracy of signal transmission.

[0041] After receiving signals from the absolute encoder and SSI sensor, the turning gear control host calculates the initial rotation angle of the generator shaft based on the preset wheel circumference and encoder resolution parameters. Once the calculation is complete, the system automatically stores this initial position data in a designated storage unit and displays the initial angle value on the operating interface for easy viewing and confirmation by the operator. This data will serve as the starting reference for subsequent turning gear control.

[0042] S3: After receiving the rotor's initial position information, the turning gear control host immediately combines the retrieved and confirmed generator parameters and calls its internally preset dedicated algorithm for calculation. This algorithm has undergone extensive theoretical analysis and practical testing and verification, and can accurately calculate the appropriate turning gear control strategy based on different generator models and rotor initial positions.

[0043] The algorithm calculates the phase sequence of the stator current to ensure the rotor rotates in a predetermined direction (clockwise or counterclockwise) and avoids reverse rotation at the current rotor position, thus determining the energizing sequence of phases A, B, and C. Simultaneously, based on the generator's electromagnetic characteristics and load conditions, a suitable current magnitude is calculated to provide sufficient electromagnetic torque to drive the rotor. Furthermore, the expected rotation angle is calculated based on the target turning gear position, providing a basis for subsequent precise control. These calculation results will form a detailed set of control parameter instructions, awaiting output for execution.

[0044] S4: The turning gear control host outputs precise control signals to the rotor-stator control system based on the calculated control parameters. The control signals include key instructions such as the stator current input phase sequence and current magnitude. The signals are transmitted through dedicated communication interfaces (such as RS-485, Ethernet interface, etc.) to ensure that the instructions are delivered to the rotor-stator control system accurately.

[0045] After receiving instructions from the turning gear control unit, the rotor-stator control system immediately controls the stator windings to carry currents of a specific phase sequence and magnitude, as required by the instructions. When the current flows through the stator windings, it generates an electromagnetic field. This electromagnetic field interacts with the rotor magnetic field to produce electromagnetic torque, thereby driving the generator rotor to rotate in a predetermined direction. During rotor rotation, it is necessary to closely observe the rotor's rotation to ensure smooth rotation without abnormal vibration or noise.

[0046] S5: During rotor rotation, the absolute encoder continuously monitors the rotor's position changes in real time, feeding back the rotor's real-time position information to the turning gear control host at a high frequency (e.g., 100 times per second). By continuously collecting the rotor's rotation angle and number of revolutions, the turning gear control host can ensure that it can promptly grasp the rotor's dynamic position.

[0047] The turning gear control host compares the real-time feedback rotor position information with the predetermined turning gear target position. Through precise numerical calculation, it obtains the deviation value between the current rotor position and the target position. This deviation value includes information such as angular deviation and rotation direction deviation.

[0048] If a positional deviation exists, the turning gear control host immediately initiates an adjustment program, adjusting the stator current control parameters according to the magnitude and direction of the deviation. Adjustment methods include changing the current phase sequence, such as switching from an ABC phase sequence to an ACB phase sequence, to change the direction of the electromagnetic field, thereby adjusting the rotor's rotation direction; and adjusting the current magnitude, increasing or decreasing the current value to control the electromagnetic torque, thus adjusting the rotor's rotation speed. Through these adjustment measures, the rotor's rotation direction and speed are corrected, forming a closed-loop precise control process of "detection-comparison-adjustment".

[0049] Repeat the above process of real-time position monitoring, position deviation calculation and control parameter adjustment to continuously and dynamically correct the rotor position until the rotor position reaches the predetermined turning target position and the deviation value is within the allowable error range (such as ±0.01 degrees), ensuring that the turning task is completed accurately.

[0050] Specifically, in S1, the initial position data of the generator main shaft is obtained by counting the number of revolutions of the encoder guide wheel. With guide wheel circumference Large axis radius Convert the initial angle: ; in, Initial angle of the generator shaft; Initial number of revolutions of the encoder guide wheel; : Encoder guide wheel circumference; : Generator shaft radius.

[0051] Specifically, in S2, the rotor angle conversion formula is as follows: The main control unit of the turning gear controls the number of rotations of the guide wheel. With the initial number of laps Combined with the guide wheel circumference and major axis radius Calculate the real-time rotor angle : ; : Real-time rotor angle (rad); : The initial angle (rad) calculated in S1; : The number of guide wheel rotations detected in real time; : Guide wheel circumference; : Radius of the major axis.

[0052] Specifically, in S2, a three-point moving average filter is used to process the data from three consecutive samplings. The filtered angle is: ; Required angle fluctuation range after filtering: ; in .

[0053] Specifically, in S2, the rotor rotation angle is verified using the following method: Drive the main shaft to rotate Record encoder feedback angle Calculate the deviation: ; like The guide wheel clamping force needs to be adjusted or the contact surface cleaned until the accuracy requirements are met. When the guide wheel is tangent to the main shaft, the displacement of the main shaft surface corresponding to the number of rotations of the guide wheel is: According to the arc length formula Angles can be obtained This achieves a linear conversion from mechanical displacement to angle, with the main source of error being: ; in, For displacement measurement error, This represents the measurement error of the large shaft radius.

[0054] Specifically, in S3, the three-phase current phase sequence control method is as follows: ① Determining the direction of rotation: Assuming the target rotates clockwise, the initial position of the rotor satisfies: When the three-phase current conduction sequence is determined to be A→B→C; if counterclockwise rotation is required, the phase sequence is C→B→A.

[0055] ② On-time calculation: Based on the target rotation angle (Unit: rad), the conduction time of each phase current is: ; Single-phase conduction time (s); Current frequency; Number of magnetic pole pairs.

[0056] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An electric turning gear device based on rotor position positioning, characterized in that: This includes a position detection mechanism, which is electrically connected to the turning gear control host, and the turning gear control host is electrically connected to the rotor-stator control system; The position detection mechanism is used to detect the rotor rotation angle and transmit the rotor rotation angle data to the turning gear control host. The aforementioned turning gear control host is used to collect rotor rotation angle data, and then locate the rotor's real-time position; The turning gear control host sends control signals to the rotor-stator control system, which adjusts the current magnitude and on-time of the rotor and stator to adjust their relative positions.

2. The electric turning gear device based on rotor position positioning according to claim 1, characterized in that: The position detection mechanism is an absolute encoder device, which includes an encoder guide wheel and an absolute encoder. The absolute encoder has an SSI sensor built in, which is electrically connected to the turning gear control host. The SSI sensor is used to detect the number of revolutions of the encoder guide wheel and transmits the number of revolutions of the encoder guide wheel to the turning gear control host. The turning gear control host converts the number of revolutions of the encoder guide wheel and the circumference of the encoder guide wheel into the rotor rotation angle.

3. The electric turning gear device based on rotor position positioning according to claim 2, characterized in that: The encoder guide wheel is installed tangentially to the outer circle of the rotor shaft, ensuring that the encoder guide wheel and the rotor shaft rotate synchronously.

4. The electric turning gear device based on rotor position positioning according to claim 2, characterized in that: The absolute encoder device also includes a support frame, one end of which is connected to the encoder guide wheel and the absolute encoder, and the other end is connected to the magnetic mounting base.

5. The electric turning gear device based on rotor position positioning according to claim 2, characterized in that: The encoder guide wheel is fixed coaxially with the shaft of the absolute encoder.

6. The electric turning gear device based on rotor position positioning according to claim 4, characterized in that: The magnetic mounting base is used to attach to the generator's casing, and the support frame is a flexible telescopic frame.

7. The electric turning gear device based on rotor position positioning according to claim 4, characterized in that: The main control unit for the rotary locomotive is a PLC controller.

8. A turning method for an electric turning gear based on rotor position positioning according to any one of claims 2-6, characterized in that... Includes the following steps: S1: At the generator maintenance site, the wheel of the position detection mechanism is installed tangentially to the outer circle of the generator shaft and fixed by the support frame and magnetic mounting base to ensure that the wheel and the coaxial absolute encoder can rotate synchronously when the shaft rotates. Start the electric turning gear device and perform a power-on self-test on the absolute encoder and SSI sensor, the turning gear control host and the rotor stator control system to confirm that the communication of each component is normal and that there are no abnormalities in the operation status. The pre-stored generator parameters are retrieved and confirmed in the turning gear control host. The generator parameters include the number of stator winding turns, the number of pole pairs, and the rated current. S2: The absolute encoder and SSI sensor start working, detecting the initial position of the generator rotor, converting the wheel rotation angle and number of revolutions into electrical signals, and transmitting them to the turning gear control host through the shielded cable; After receiving the signal, the turning control host calculates the initial rotation angle of the generator shaft based on the wheel circumference and encoder resolution, and stores the initial position data. S3: The turning gear control host calculates the initial rotor position based on the received rotor position information and the retrieved generator parameters by calling the internal preset algorithm. The algorithm calculates the phase sequence of the stator current to ensure that the rotor rotates in the predetermined direction and avoids reverse rotation at the current rotor position. This determines the energizing sequence, current magnitude, and expected rotation angle of the three phases A, B, and C. S4: The turning gear control host outputs control signals to the rotor-stator control system based on the calculation results, directly controlling the phase sequence and magnitude of the stator current. The stator windings are fed with current of a specific phase sequence and magnitude according to the PLC instructions, generating an electromagnetic field. The electromagnetic field is used to drive the generator rotor to start rotating in a predetermined direction. S5: During the rotor rotation process, the absolute encoder monitors the rotor position change in real time and continuously feeds back the real-time rotor position information to the turning gear control host. The turning gear control host compares the real-time rotor position information with the predetermined position and calculates the position deviation; If a deviation exists, the turning gear control host immediately adjusts the control parameters of the stator current, including changing the current phase sequence and adjusting the current magnitude, to correct the rotation direction and speed of the rotor, thereby achieving closed-loop precise control of the rotor position. Repeat the above process until the rotor position reaches the predetermined target position for turning.

9. The turning method of the electric turning gear device based on rotor position positioning according to claim 1, characterized in that: In S1, the initial position data of the generator shaft is obtained by counting the number of revolutions of the encoder guide wheel. With guide wheel circumference Large axis radius Convert the initial angle: ； in, Initial angle of the generator shaft; Initial number of revolutions of the encoder guide wheel; : Encoder guide wheel circumference; : Generator shaft radius.

10. The turning method of the electric turning gear device based on rotor position positioning according to claim 1, characterized in that: In S2, the rotor angle conversion formula is as follows: The main control unit of the turning gear controls the number of rotations of the guide wheel. With the initial number of laps Combined with the guide wheel circumference and major axis radius Calculate the real-time rotor angle : ； : Real-time rotor angle; The initial angle calculated in S1; : The number of guide wheel rotations detected in real time; : Guide wheel circumference; : Radius of the major axis.

11. The turning method of the electric turning gear device based on rotor position positioning according to claim 1, characterized in that: In S2, a three-point moving average filter is used to process the data from three consecutive samplings. The filtered angle is: ; Filtered angle fluctuation range: ;in .

12. The electric turning gear device and method based on rotor position positioning according to claim 1, characterized in that: In S2, the rotor rotation angle is verified using the following method: Drive the main shaft to rotate Record encoder feedback angle Calculate the deviation: ； like The guide wheel clamping force needs to be adjusted or the contact surface cleaned until the accuracy requirements are met. When the guide wheel is tangent to the main shaft, the displacement of the main shaft surface corresponding to the number of rotations of the guide wheel is: According to the arc length formula , get angle This achieves a linear conversion from mechanical displacement to angle, with the main source of error being: ； in, For displacement measurement error, This represents the measurement error of the large shaft radius.

13. The turning method of the electric turning gear device based on rotor position positioning according to claim 1, characterized in that: In S3, the three-phase current phase sequence control method is as follows: ① Determining the direction of rotation: Assuming the target rotates clockwise, the initial position of the rotor satisfies: When the three-phase current conduction sequence is determined to be A→B→C; if counterclockwise rotation is required, the phase sequence is C→B→A. ② On-time calculation: Based on the target rotation angle The conduction time of each phase current is: ； in Single-phase conduction time; Current frequency; Number of magnetic pole pairs.

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