Multi-point transmission synchronism detection method and system

Abstract

The invention relates to the technical field of photovoltaic tracking, and discloses a multipoint transmission synchronism detection method and system, which are applied to a mechanical multipoint driving type photovoltaic tracking system, the photovoltaic tracking system mainly comprises a transmission shaft, a driving unit and a plurality of driven units, the detection method mainly comprises the steps that an induction module and a self-powered assembly are arranged between a driven unit at a preset position and a transmission shaft, the induction module converts kinetic energy of the transmission shaft into electric energy through the self-powered assembly for self-powering, the induction module sends a feedback signal to a control module in a power supply state, and the induction module sends a feedback signal to the control module in a non-power-supply state; the sensing module does not send out a feedback signal; when the driving unit moves, the control module judges whether the driven unit at the preset position synchronously moves or not according to the receiving condition of the feedback signal, so that the accurate synchronism of the mechanical multi-point driving type photovoltaic tracking system is effectively ensured, and the problems that a transmission shaft or related structural parts are distorted and damaged due to asynchronous transmission and the like are effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic tracking technology, and further to a multi-point transmission synchronization detection method and system. Background Art

[0002] With the rapid development of photovoltaic power generation technology, photovoltaic tracking systems have become a core component of large-scale ground-based power plants due to their significant advantages in improving power generation efficiency. To improve the reliability of tracking systems and reduce manufacturing costs, the industry is gradually promoting mechanical multi-point synchronous drive systems. These systems typically use a single drive unit (integrated motor and reducer) to drive a transmission shaft (such as a synchronous shaft or main shaft), transmitting power to multiple driven units, thereby achieving multi-point synchronous rotation.

[0003] However, practical applications still present certain limitations. Existing control systems typically monitor only the operating parameters of the drive unit, but lack real-time visibility into the working status of the driven unit or drive shaft. In some cases, such as when torque transmission is impeded due to damage to the driven unit or deformation or anomalies in the drive shaft, asynchronous motion can occur between the drive unit and the driven unit. Due to a lack of effective detection methods, these anomalies are difficult to detect in a timely manner, ultimately leading to distortion or even structural damage to the photovoltaic rack. Summary of the Invention

[0004] In response to the above technical problems, the purpose of this application is to provide a multi-point transmission synchronization detection method and system, which can detect the motion synchronization between the driving unit and the driven unit, avoid structural damage caused by asynchronous motion, and reduce operation and maintenance costs.

[0005] To achieve the above objectives, the present application provides a multi-point transmission synchronization detection method and system, which are applied to a mechanical multi-point drive photovoltaic tracking system. The photovoltaic tracking system includes a transmission shaft, a drive unit, and multiple driven units. The drive unit is connected to adjacent driven units through the transmission shaft, and adjacent driven units are connected to each other through the transmission shaft. The drive unit is used to drive the transmission shaft to rotate, and the driven units perform synchronous movement under the action of the transmission shaft. The multi-point transmission synchronization detection method includes:

[0006] Disposing a sensing module and a self-powered component between the driven unit and the transmission shaft at a preset position;

[0007] The sensing module is configured to convert the kinetic energy of the transmission shaft into electrical energy through the self-powered component for self-powering, wherein the sensing module sends a feedback signal to the control module when in a powered state, and does not send the feedback signal when in an unpowered state;

[0008] When the driving unit moves, the control module determines whether the driven unit at the preset position moves synchronously according to the reception of the feedback signal.

[0009] In some embodiments, enabling the induction module to convert the kinetic energy of the transmission shaft into electrical energy through the self-power supply component for self-power supply specifically includes:

[0010] Configure the self-power supply component to be electrically connected to the induction module. The self-power supply component includes a first fitting and a second fitting. The first fitting is connected to the transmission shaft, and a gap is formed between the second fitting disposed on the induction module and the first fitting radially.

[0011] Drive the first fitting and the second fitting to rotate relative to each other, and convert the kinetic energy of the transmission shaft into electrical energy by using the magnetoelectric effect.

[0012] In some embodiments, the first fitting is a permanent magnet or an armature coil, and the second fitting is an armature coil or a permanent magnet matching the first fitting.

[0013] In some embodiments, when the driving unit moves, the control module determines whether the driven unit at the preset position moves synchronously according to the reception of the feedback signal. The judgment logic is as follows:

[0014] If the control module receives the feedback signal sent by the induction module, it is determined that the driven unit at the preset position moves synchronously;

[0015] If the control module does not receive the feedback signal sent by the induction module, it is determined that the driven unit at the preset position does not move synchronously.

[0016] In some embodiments, after determining that the driven unit at the preset position does not move synchronously, the following steps are included:

[0017] Trigger the protection mode of the photovoltaic tracking system, and control the driving unit to stop rotating or stop power supply.

[0018] In some embodiments, the number of the induction modules is at least one. The induction modules are disposed between the driven unit at the preset position and the transmission shaft. The driven unit at the preset position is far from the driving unit, so that the control module can determine whether the driven unit far from the driving unit moves synchronously according to the reception of the feedback signal.

[0019] In some embodiments, the driving unit is disposed at one end of the transmission shaft along the extending direction of the transmission shaft, and a plurality of the driven units are distributed along the transmission shaft on the same side of the driving unit to form a single-sided drive;

[0020] Among them, the driven unit at a preset position is disposed at the other end of the transmission shaft away from the driving unit; the transmission shaft is a main shaft or a synchronous shaft.

[0021] On the other hand, the present application also provides a multi-point transmission synchronization detection system, which is disposed in a mechanical multi-point drive type photovoltaic tracking system. The photovoltaic tracking system includes a transmission shaft, a driving unit, and a plurality of driven units. The transmission shaft is used to connect the driving unit and the driven units, so that the transmission shaft can rotate under the action of the driving unit; the driving unit is used to drive the transmission shaft to rotate and provide power to drive the transmission shaft and the driven units to move synchronously; the multi-point transmission synchronization detection system includes:

[0022] An induction module, which is disposed between the driven unit at a preset position and the transmission shaft;

[0023] A self-power supply component, which is electrically connected to the induction module and is used to convert the kinetic energy of the transmission shaft into electric energy and provide power for the induction module, so that the induction module can emit a feedback signal in a powered state;

[0024] A control module, which is used to receive the feedback signal and judge whether the driven unit at a preset position is synchronous according to the reception condition of the feedback signal.

[0025] In some embodiments, the self-power supply component includes a first fitting and a second fitting. The first fitting is connected to the transmission shaft, and the second fitting is disposed on the induction module and has a gap formed radially between the first fitting and the second fitting. By driving the first fitting and the second fitting to rotate relative to each other, the kinetic energy of the transmission shaft can be converted into electric energy by using the electromagnetic induction effect.

[0026] In some embodiments, the first fitting is a permanent magnet or an armature coil, and the second fitting is an armature coil or a permanent magnet matching the first fitting. The kinetic energy of the transmission shaft is converted into electric energy through electromagnetic induction between the two.

[0027] Compared with the prior art, the multi-point transmission synchronization detection method and system provided by the present application have the following beneficial effects:

[0028] First, by configuring an induction module and a self-power supply component between the driven unit and the transmission shaft at a preset position, the kinetic energy of the transmission shaft can be utilized to provide power for the induction module, enabling self-power supply without the need for additional power support, reducing the complexity of the system and energy consumption. Secondly, the induction module sends a feedback signal to the control module in the powered state and does not send a feedback signal in the unpowered state. Thus, it can be determined whether the movement of the driven unit and the driving unit at the preset position is synchronized, effectively ensuring the transmission synchronization of the multi-point drive photovoltaic tracking system, improving the reliability and stability of the system, and effectively avoiding problems such as distortion and damage of the transmission shaft or related structural components caused by asynchronous transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above characteristics, technical features, advantages and their implementation manners of the present application will be further described below in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0030] Figure 1 is the basic flowchart of the multi-point transmission synchronization detection method in an embodiment of the present application;

[0031] Figure 2 is the judgment logic diagram of multi-point transmission synchronization judgment in an embodiment of the present application;

[0032] Figure 3 is the related structural schematic diagram of the self-power supply component in an embodiment of the present application.

[0033] Description of the reference numerals in the drawings:

[0034] The first fitting 1; the second fitting 2; the induction module 3; the sensor 30; the connection base 31; the connecting sleeve 4; the circuit board 5; the output shaft 6. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0036] In this article, "one" not only means "only this one", but also means "more than one" situation. It should be further understood that the term "and / or" used in the specification and claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0037] In this document, it should be noted that unless otherwise clearly stipulated and defined, the terms "install", "connect", and "link" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application.

[0039] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0040] With the rapid development of photovoltaic power generation technology, photovoltaic tracking systems have gradually become important equipment for improving the power generation efficiency of photovoltaic power plants. In existing photovoltaic tracking bracket systems, many companies have adopted mechanical multi-point synchronous drive systems. This system drives the transmission shaft through an active drive unit (equipped with a drive motor) and transmits the power to the driven units without drive motors, thereby achieving synchronous drive of multiple driven units. In this way, the system can adjust the positions of multiple driven parts simultaneously to ensure that the photovoltaic panel can always follow the sun's trajectory and maximize the power generation efficiency of photovoltaic power generation.

[0041] However, there are still some technical problems in the existing system. Specifically, in a multi-point drive system, once a driven unit or the transmission shaft fails or malfunctions, the torque cannot be smoothly transmitted from the active drive unit to the driven unit, resulting in the non-synchronization of the active and driven parts. This non-synchronization phenomenon will cause the photovoltaic tracking bracket to malfunction, thereby affecting the operating efficiency of the entire system. Moreover, since the current mechanical multi-point drive photovoltaic tracking bracket control system usually cannot detect the working state of the driven parts without drive motors, once a driven unit fails, the control system cannot identify and take corresponding remedial measures in time, which may cause the bracket to twist or the structure to be damaged, seriously affecting the stability and service life of the photovoltaic system.

[0042] Therefore, in order to address the synchronization problems and insufficient fault detection problems existing in the existing mechanical multi-point drive photovoltaic tracking system, the multi-point transmission synchronization detection method provided in this application can detect synchronization and improve the reliability of the system.

[0043] In one embodiment, the reference Figure 1 The present application provides a multi-point transmission synchronization detection method, which is applied to a mechanical multi-point drive photovoltaic tracking system. It should be noted that the mechanical multi-point drive photovoltaic tracking system involved in the present invention mainly includes the following key components: a transmission shaft, a drive unit, and a plurality of driven units. The drive unit is connected to adjacent driven units through a transmission shaft, and adjacent driven units are connected to each other through a transmission shaft. The drive unit and the plurality of driven units are spaced apart along the extension direction of the transmission shaft. The drive unit is generally equipped with a drive motor to drive the transmission shaft to rotate, thereby transmitting power to the plurality of driven units. The driven unit is the passive execution part of the system and is not directly equipped with a drive motor.

[0044] Based on the above content, the multi-point transmission synchronization detection method in this embodiment includes:

[0045] Step S1: disposing a sensing module and a self-powered component between a driven unit and a transmission shaft at a preset position.

[0046] Step S2: The sensing module converts the kinetic energy of the transmission shaft into electrical energy through the self-powered component for self-powering. The sensing module sends a feedback signal to the control module in the powered state, and does not send a feedback signal in the unpowered state.

[0047] Step S3: When the driving unit moves, the control module determines whether the driven unit at the preset position moves synchronously according to the feedback signal received.

[0048] In this method, when the drive shaft connected to the driven unit at a preset position is in a normal rotational state, the sensing module can convert the drive shaft's kinetic energy into electrical energy to provide self-power, thereby enabling it to operate and send a feedback signal to the control module. When the drive shaft connected to the driven unit at a preset position is stationary, the sensing module cannot provide self-power, thus failing to operate normally and unable to send a feedback signal to the control module. The control module performs synchronization detection when the driving unit is in motion and, based on whether it receives a feedback signal, determines in real time whether the driven unit at the preset position is moving synchronously with the driving unit.

[0049] In step S2 of this embodiment, the sensing module converts the kinetic energy of the transmission shaft into electrical energy through the self-power supply component to achieve self-power supply of the system. Specifically, when the transmission shaft rotates, the self-power supply component in the sensing module converts the mechanical kinetic energy of the transmission shaft into electrical energy to supply the operation of the sensing module; after the sensing module is in the power supply state, it continuously senses the movement of the driven unit at the corresponding position.

[0050] It can be understood that by utilizing the mechanical kinetic energy generated during the rotation of the transmission shaft, through appropriate rotating components and electromagnetic principles, it is converted into electrical energy, and then a continuous power supply is provided for the sensing module.

[0051] Specifically, the self-power supply component can interact with structures such as electromagnetic coils or capacitors in the sensing module through a rotating component installed on the transmission shaft. When the transmission shaft rotates, the mechanical kinetic energy is converted into electrical energy through friction, electromagnetic induction or other energy conversion principles, and is supplied to the sensing module through a conductive circuit, ensuring that the sensing module can work normally and send feedback signals to the control module.

[0052] In different application scenarios, the self-power supply component can be designed and configured as needed. For example, for different working environments of the transmission shaft, appropriate energy conversion methods and device types can be selected to adapt to different working conditions.

[0053] Powering the sensing module through the self-movement of the transmission shaft saves energy, avoids dependence on external power sources, eliminates wiring costs and fault points, simplifies the structure of the system, and improves the reliability and durability of the system.

[0054] At the same time, when the driven unit at the preset position or the transmission shaft connected to the driven unit at the preset position fails (for example, the driven unit at the preset position jams or disconnects from the transmission shaft), the sensing module cannot obtain electrical energy normally, so the sensing module is in an unpowered state, and no feedback signal will be sent at this time.

[0055] In step S3, specifically, when the control module drives the unit to move, it judges whether the driven unit at the preset position moves synchronously according to the receipt of the feedback signal. That is, the control module only performs multi-point drive synchronism detection when the drive unit moves. When the drive unit stops rotating, the entire photovoltaic tracking system is in a stationary state, and at this time the control module does not need to perform multi-point drive synchronism detection.

[0056] When the drive unit moves, if the control module receives a feedback signal, it can be considered that the transmission shaft connected to the driven unit at the preset position rotates normally, and the movement of the driven unit at the preset position is synchronous with the movement of the drive unit in the photovoltaic tracking system, indicating that there is no fault or abnormality in the transmission system.

[0057] If the induction module does not send any signal, the control module will determine that the transmission shaft connected to the driven unit at the preset position is not rotating synchronously, and the movement of the driven unit at the preset position is inconsistent with the movement of the driving unit in the photovoltaic tracking system. There may be problems such as jamming of the driven unit and deformation of the transmission shaft, resulting in asynchronous transmission.

[0058] In summary, in this embodiment, when the driving unit is moving, when the control module receives a feedback signal from the induction module, it means that the transmission between the driven unit and the driving unit at the preset position is synchronized. At this time, the induction module is in a normal working state, and converts the kinetic energy of the transmission shaft into electrical energy through electromagnetic induction for its normal operation to generate a feedback signal. The control module confirms the synchronous movement of the driven unit and the driving unit by receiving the signal and determines that it is operating normally.

[0059] On the contrary, when the control module does not receive the feedback signal from the induction module, the control module will determine that the transmission between the corresponding driven unit and the driving unit is not synchronized. At this time, insufficient power is obtained to supply the induction module to work, which is usually caused by a failure, stoppage or jamming of the driven unit or the transmission shaft at the preset position.

[0060] Refer to the attached Figure 2 , it can be obtained that when the driving unit is moving, the control module in step S3 determines whether the driven unit at the preset position moves synchronously according to the receipt of the feedback signal. Its judgment logic is: if the control module receives the feedback signal sent by the induction module, it determines that the driven unit at the preset position moves synchronously; if the control module does not receive the feedback signal sent by the induction module, it determines that the driven unit at the preset position does not move synchronously.

[0061] Generally speaking, in this application, the judgment logic of the detection method is mainly based on the feedback signal real-time monitored by the induction module, and the control module can infer the state of the system by analyzing the sending situation and / or change trend of the signal.

[0062] In one embodiment, based on the above content, after determining that the driven unit at the preset position does not move synchronously, the following steps are further included:

[0063] Trigger the protection mode of the photovoltaic tracking system to control the driving unit to stop rotating or stop power supply.

[0064] It is understandable that when asynchronous movement is detected, the most crucial countermeasure is to stop the movement of the transmission shaft immediately to avoid structural distortion of the photovoltaic tracking bracket, overload of transmission components, or abnormal stress accumulation caused by asynchrony. Therefore, preferably, the control module will immediately send a stop command to the drive unit to make the drive unit stop working and ensure that the transmission shaft no longer rotates. Of course, in addition to stopping the drive unit, its power supply can also be cut off. At this time, the drive unit not only stops rotating but also can prevent misoperation of the drive unit or misstart caused by software / hardware failures.

[0065] Optionally, the alarm module in the photovoltaic tracking system can also be controlled to alarm to indicate an abnormal situation. For example, an alarm signal can be sent to the management personnel to remind the operation and maintenance personnel to intervene. Generally, methods such as sound and light alarms and remote notifications can be used. In addition, information such as the number of alarms can also be synchronously recorded in the work log for subsequent data support.

[0066] In one embodiment, based on the above content, depending on the setting of the photovoltaic tracking system, the number of induction modules is at least one, and the induction module is arranged between the driven unit at the preset position and the transmission shaft, and the driven unit at the preset position is far from the drive unit.

[0067] In the photovoltaic tracking system, when there is an unsynchronized movement of a driven unit or the transmission shaft between the drive unit and the driven unit at the preset position (for example, the driven unit is damaged or the transmission shaft is deformed, resulting in abnormal torque transmission), the driven unit and the transmission shaft at the preset position will also stop rotating.

[0068] Therefore, when the driven unit at the preset position is far from the drive unit, the induction module can cover a larger range of the transmission shaft for synchronism monitoring, that is, it can detect the synchronism of more driven units and transmission shafts. When there is an unsynchronized movement of any driven unit or the transmission shaft between the drive unit and the driven unit at the preset position, the induction module will not send a signal to the control module and can thus be detected by the control module. By selecting the driven unit far from the drive unit as the driven unit at the preset position, technicians can achieve an efficient synchronism detection effect with fewer configured induction modules.

[0069] Furthermore, the driven unit at the preset position is usually preferably the driven unit farthest from the drive unit in the photovoltaic tracking system because this position is most easily affected by abnormal transmission, aging, or mechanical wear. And when there is a failure of a driven unit or the transmission shaft in the photovoltaic tracking system and it stops rotating, the driven unit farthest from the drive unit will also stop rotating. Therefore, this position is mainly used as the key point for synchronism detection in this application.

[0070] When the driving unit is arranged at one end of the transmission shaft along the extension direction of the transmission shaft, single-sided driving is formed. The driven units are distributed on the same side of the driving unit along the transmission shaft, that is, the power is transmitted from one end of the transmission shaft to the other end. In this structure, the driven unit at the preset position is the driven unit arranged at the other end of the transmission shaft far from the driving unit, and the induction module is correspondingly arranged between this driven unit and the transmission shaft. At this time, only one induction module needs to be configured to effectively cover the synchronization monitoring of the entire transmission shaft range;

[0071] In contrast, when the driving unit is arranged at the middle position of the transmission shaft along the extension direction of the transmission shaft, double-sided driving is formed. The driven units are distributed on both sides of the driving unit along the transmission shaft, and the power is transmitted from the middle driving unit to both sides. In this structure, the driven units at the preset positions are the two driven units arranged at both ends of the transmission shaft, and the two induction modules are respectively arranged between the two driven units and the transmission shaft. At this time, only two induction modules need to be configured to perform multi-point transmission synchronization detection on the entire photovoltaic tracking system.

[0072] By reducing the number of configured induction modules, not only can the maintenance complexity of the system be reduced, but also the cost and the difficulty of daily operation and maintenance can be reduced, making this multi-point transmission synchronization detection method applicable to the deployment of large-scale photovoltaic power stations.

[0073] Of course, for the situation where synchronization monitoring needs to be carried out in a large range, induction modules can also be configured at multiple positions according to actual needs and cost considerations. The control module then comprehensively analyzes and judges the synchronization between each driven unit and the transmission shaft according to the signals fed back by each induction module.

[0074] Furthermore, the driven unit at the preset position can also be selected as each driven unit in the photovoltaic tracking system, and the induction module is arranged between each driven unit and the transmission shaft. At this time, by configuring multiple induction modules, the synchronization of multiple driven rotations in the photovoltaic tracking system can be detected, synchronizing anomalies can be detected early, the accuracy of fault detection can be further improved, the stability and efficient operation of the system in complex application scenarios can be ensured, and the position of the driven unit with anomalies can be determined, facilitating the maintenance of the photovoltaic tracking system. In this embodiment, the number of induction modules is not compulsorily limited and can be flexibly adjusted according to requirements.

[0075] Based on the above single-sided driving situation, the transmission shaft can be the main shaft or the synchronization shaft. It should be noted that regardless of whether the transmission shaft is the main shaft or the synchronization shaft, the induction module is arranged between the driven unit at the end of the shaft and the main shaft or the synchronization shaft. Since this position is the farthest from the driving unit, the synchronization state at the end of the shaft can be accurately monitored, thereby judging whether there is a synchronization problem.

[0076] Based on the above, in one embodiment, in step S2, the induction module is made to self-power by converting the kinetic energy of the transmission shaft into electrical energy through a self-power supply component, which specifically includes:

[0077] The self-power supply component is configured to be electrically connected to the induction module. The self-power supply component includes a first fitting and a second fitting. The first fitting is connected to the transmission shaft, and a gap is formed between the second fixing member disposed on the induction module and the first fitting in the radial direction.

[0078] Based on the above, then drive the first fitting and the second fitting to rotate relative to each other, and utilize the electromagnetic induction effect to convert the kinetic energy of the transmission shaft into electrical energy to provide the required power for the induction module.

[0079] In this embodiment, the design of the first fitting and the second fitting is based on various electrical energy conversion methods such as friction, piezoelectricity, or electromagnetic induction. Specifically, the first fitting is connected to the transmission shaft and thus rotates with the rotation of the transmission shaft; while the second fitting is fixed to the induction module to ensure that relative movement occurs between the first fitting and the second fitting when the transmission shaft rotates. This relative movement method can adopt technologies such as friction, magnetic field induction, and piezoelectric effect to convert mechanical energy (kinetic energy) into electrical energy, and then provide the required power for the induction module. For example, electrical energy is generated between the first fitting and the second fitting through a piezoelectric element; when the transmission shaft rotates or undergoes a small deformation, the piezoelectric element will undergo stress deformation and thus generate charges, converting mechanical energy into electrical energy.

[0080] Utilizing the natural rotation of the transmission shaft in the photovoltaic tracking system to power the induction module not only reduces the system's dependence on external power sources but also makes full use of the original kinetic energy in the system. Specifically, the movement of the transmission shaft itself converts kinetic energy into electrical energy through the self-power supply component to provide continuous and stable power for the induction module. This process is completed relying on the power transmission process inside the photovoltaic tracking system, so no external power source is required, no additional burden is added to the system, the energy efficiency is higher, and the system is more independent and energy-saving.

[0081] In one embodiment, based on the above, the first fitting is a permanent magnet, which can be fixed on the transmission shaft and rotates with the rotation of the transmission shaft. The second fitting is an armature coil, which is fixed to the induction module and maintains a certain relative position with the permanent magnet. When the permanent magnet rotates synchronously with the transmission shaft, it will continuously pass through the armature coil, thereby generating an induced current in the armature coil. This induced current provides the necessary power for the induction module to enable it to work stably and emit feedback signals.

[0082] In contrast, in another embodiment, the armature coil serves as the first mating part, and the permanent magnet serves as the second mating part, which are respectively fixed to the induction module and the transmission shaft. Then, the rotation of the transmission shaft causes relative movement between the armature coil and the permanent magnet, and thus current is generated through the principle of electromagnetic induction, which can also provide necessary power for the induction module.

[0083] In addition to the above embodiments, based on factors such as on-site conditions and budget costs, the first mating part can be set as a friction material layer, and the second mating part can be set as a friction electrode. As the transmission shaft rotates, the friction material layer and the friction electrode come into contact or separate. When relative movement occurs between the friction material layer and the friction electrode, electrostatic charges will accumulate on the contact surface, and the electrostatic charges can be guided to the induction module to provide the required electrical energy.

[0084] Based on the above content, it can be known that in this application, when the transmission shaft does not rotate, the induction module is in a non-operating state due to lack of sufficient power supply, unable to sense the motion state and will not emit feedback signals.

[0085] In one embodiment, according to another aspect of the present application, the present application further provides a multi-point drive synchronization detection system, which is used for a mechanical multi-point drive type photovoltaic tracking system. The photovoltaic tracking system includes a transmission shaft, an active drive unit (a rotary drive with a motor), and multiple driven units (rotary drives without motors). The system relies on the active drive unit to provide driving force and transmits torque to multiple driven units through the transmission shaft (such as a mechanical synchronization shaft) to make them rotate synchronously to ensure the stable operation of the entire photovoltaic support. However, when a failure occurs in the transmission shaft or the driven unit, the torque cannot be effectively transmitted, which will cause synchronization problems in the photovoltaic tracking system, and at this time, the photovoltaic support is easily damaged. At the same time, since the driven unit does not have a motor, its operating state cannot be directly obtained through the control terminal, which further increases the detection difficulty.

[0086] To solve the above problems, a multi-point drive synchronization detection system is provided in the present application, and with reference to the attached Figure 3 of the specification, the detection system includes an induction module 3 and a control module. The induction module 3 is arranged between the driven unit and the transmission shaft at a preset position. Among them, the induction module 3 has a self-power supply component for converting the kinetic energy of the transmission shaft into electrical energy and providing power for the induction module 3, so that the induction module 3 can emit feedback signals in the powered state.

[0087] The control module is used to receive the feedback signal and judge whether the driven unit at the preset position is synchronous according to the receipt situation of the feedback signal. It can be understood that if the control module fails to receive the feedback signal, the control module will judge that the movement is asynchronous, and the operator can know that there is a problem with the synchronization of the system.

[0088] Furthermore, the driven unit at the preset position is generally selected as the driven unit farthest from the driving unit. Because by detecting the state of the farthest driven unit, potential problems in the entire transmission system can be discovered in a timely manner. If the operating state at the end is normal, the overall operating state of the system is usually normal as well.

[0089] Meanwhile, in some embodiments, induction modules 3 can also be arranged between all / most of the driven units and the transmission shaft. However, if induction modules 3 are arranged at all driven units, it may lead to excessive monitoring nodes and data acquisition devices, thereby increasing the cost and maintenance complexity of the system. By centrally arranging the induction modules 3 at the farthest position, the number of arrangements and costs can be effectively reduced, while ensuring that the synchronous detection of the entire system is not omitted. As long as the farthest driven unit operates synchronously normally, the synchronism at other positions can usually be guaranteed.

[0090] In one embodiment, the self-power supply component includes a first fitting 1 and a second fitting 2. The first fitting 1 is connected to the transmission shaft, and the second fitting 2 is arranged on the induction module 3 and has a gap formed radially between it and the first fitting 1. By driving the first fitting 1 and the second fitting 2 to rotate relative to each other, the kinetic energy of the transmission shaft can be converted into electrical energy using the magnetoelectric effect.

[0091] Optionally, the first fitting 1 is a permanent magnet or an armature coil, and the second fitting 2 is an armature coil or a permanent magnet matching the first fitting 1. The kinetic energy of the transmission shaft is converted into electrical energy through electromagnetic induction between the two.

[0092] It should be noted that, as can be seen from the foregoing, in the current mechanical multi-point drive photovoltaic tracking system, a rotary drive is generally provided in the driven unit, and the output shaft of the rotary drive is in transmission connection with the transmission shaft to transfer power between different driven units. The transmission connection method can generally adopt coupling connection, flange connection, etc., which are not specifically limited in this embodiment.

[0093] In addition, in this embodiment, it can be understood that there is a gap between the second fitting 2 and the first fitting 1 in the radial direction, and there is no direct contact between the two. Furthermore, it can be ensured that during the rotation of the transmission shaft, there will be no mechanical friction or interference between the first fitting 1 and the second fitting 2, improving the reliability of the system. Through the non-contact self-power supply component, wear and heat generation are reduced, and the service life of the component can be significantly extended.

[0094] On the other hand, the gap design also enables the setting of the self-power supply component to have a certain manufacturing deviation, improving the assembly fault tolerance rate of the component and reducing the manufacturing cost.

[0095] Thus, based on the above content, in one embodiment, more specifically, as Figure 3As shown, the induction module 3 includes a connection base 31 and a sensor 30 disposed on the connection base 31. The sensor 30 is used to detect the motion state of the transmission shaft. The connection base 31 can be fixed to the base of the driven unit, and the second fitting 2 is fixed to the connection base 31 to form a stator.

[0096] The self-powered component further includes a connecting sleeve 4 for connecting with the transmission shaft (the transmission shaft is sleeved inside the connecting sleeve 4 and can be fixed to the connecting sleeve 4 by bolts). When the transmission shaft rotates normally, the output shaft 6 of the rotary actuator in the driven unit can synchronously rotate inside the connection base 31. The first fitting 1 is disposed on the output shaft 6. In other words, the first fitting 1 is indirectly connected to the transmission shaft to form a rotor.

[0097] Specifically, referring to the attached drawings, the first fitting 1 is an armature coil and the second fitting 2 is a permanent magnet. Then the armature coil rotates within the magnetic field formed by the permanent magnet, thereby cutting the magnetic induction lines, and an induced electromotive force is generated at both ends of the coil based on the principle of electromagnetic induction. When the rotor rotates, the relative movement between the coil and the permanent magnet causes the magnetic flux to change periodically, thus converting mechanical energy into electrical energy.

[0098] In one embodiment, furthermore, a circuit board 5 is further included in the induction module 3. The circuit board 5 is disposed inside the connection base 31 and serves as a data processing unit to perform data processing such as logical judgment, filtering, and integration on the feedback signal. In the above embodiment, the sensor 30 is disposed on the circuit board 5. The induced current generated by the relative movement of the first fitting 1 and the second fitting 2 is provided to the circuit board 5 and the sensor 30, so that when the power supply of the circuit board 5 is stable, a feedback signal can be continuously sent to the control module, and when the power supply is abnormal, the feedback is interrupted.

[0099] Wherein, the circuit board 5 can also be connected to a storage battery for storing excess electrical energy or powering the circuit board 5 under certain abnormal conditions.

[0100] It should be noted that the above embodiments can be freely combined according to needs. The above is only the preferred embodiment of the present application. It should be pointed out that for those of ordinary skill in the art of the present technology, without departing from the principle of the present application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A method for detecting multi-point drive synchronization, which is applied to a mechanical multi-point drive type photovoltaic tracking system, is characterized in that, The photovoltaic tracking system includes a transmission shaft, a drive unit, and multiple driven units. The drive unit is connected to adjacent driven units through the transmission shaft, and adjacent driven units are connected to each other through the transmission shaft. The drive unit is used to drive the transmission shaft to rotate. The multiple driven units move synchronously under the action of the transmission shaft. The multi-point transmission synchronization detection method includes: Disposing a sensing module and a self-powered component between the driven unit and the transmission shaft at a preset position; The sensing module is configured to convert the kinetic energy of the transmission shaft into electrical energy through the self-powered component for self-powering, wherein the sensing module sends a feedback signal to the control module when in a powered state, and does not send the feedback signal when in an unpowered state; When the driving unit moves, the control module determines whether the driven unit at the preset position moves synchronously according to the receipt of the feedback signal.

2. The multi-point transmission synchronization detection method according to claim 1, characterized in that: The step of enabling the sensing module to convert the kinetic energy of the transmission shaft into electrical energy through the self-powered component for self-powering specifically includes: The self-powered component is configured to be electrically connected to the sensing module, and the self-powered component includes a first mating piece and a second mating piece, the first mating piece is connected to the transmission shaft, and the second mating piece is disposed on the sensing module and forms a gap radially between the first mating piece and the second mating piece; The first matching member and the second matching member are driven to rotate relative to each other, and the kinetic energy of the transmission shaft is converted into electrical energy by utilizing the magnetoelectric effect.

3. The multi-point transmission synchronization detection method according to claim 2, characterized in that: The first matching piece is a permanent magnet or an armature coil, and the second matching piece is an armature coil or a permanent magnet matching the first matching piece.

4. The multi-point transmission synchronization detection method according to claim 1, characterized in that: When the driving unit moves, the control module determines whether the driven unit at the preset position moves synchronously based on the receipt of the feedback signal. The judgment logic is: If the control module receives the feedback signal from the sensing module, it determines that the driven unit at the preset position moves synchronously; If the control module does not receive the feedback signal sent by the sensing module, it is determined that the driven unit at the preset position does not move synchronously.

5. The multi-point drive synchronization detection method according to claim 4, wherein After determining that the driven unit at the preset position does not move synchronously, the method includes the following steps: The protection mode of the photovoltaic tracking system is triggered to control the driving unit to stop rotating or stop supplying power.

6. The multi-point transmission synchronization detection method according to any one of claims 1 to 5, characterized in that: There is at least one sensing module, and the sensing module is arranged between the driven unit at a preset position and the transmission shaft. The driven unit at the preset position is away from the driving unit, so that the control module can determine whether the driven unit away from the driving unit moves synchronously based on the receipt of the feedback signal.

7. The multi-point drive synchronization detection method according to claim 6, wherein: The driving unit is arranged at one end of the transmission shaft along the extension direction of the transmission shaft, and a plurality of the driven units are distributed on the same side of the driving unit along the transmission shaft to form a single-side drive; Among them, the driven unit at the preset position is arranged at the other end of the transmission shaft away from the driving unit; The transmission shaft is a main shaft or a synchronous shaft.

8. A multi-point drive synchronization detection system, characterized in that, It is arranged in a mechanical multi-point drive type photovoltaic tracking system, the photovoltaic tracking system includes a transmission shaft, a driving unit and a plurality of driven units, the transmission shaft is used to connect the driving unit and the driven unit, so that the transmission shaft can rotate under the action of the driving unit; The driving unit is used to drive the transmission shaft to rotate and provide power to drive the transmission shaft and the driven unit to move synchronously; The multi-point drive synchronization detection system includes: An induction module, arranged between the driven unit at the preset position and the transmission shaft; A self-power supply component, electrically connected to the induction module, used to convert the kinetic energy of the transmission shaft into electrical energy and provide power for the induction module, so that the induction module can emit a feedback signal in the powered state; A control module, used to receive the feedback signal and judge whether the driven unit at the preset position is synchronized according to the reception condition of the feedback signal.

9. The multi-point drive synchronization detection system according to claim 8, wherein: The self-power supply component includes a first fitting and a second fitting, the first fitting is connected to the transmission shaft, the second fitting is arranged on the induction module, and there is a gap between the first fitting and the second fitting radially. By driving the first fitting and the second fitting to rotate relative to each other, the kinetic energy of the transmission shaft can be converted into electrical energy by using the magnetoelectric effect.

10. The multi-point drive synchronization detection system according to claim 9, wherein: The first fitting is a permanent magnet or an armature coil, the second fitting is an armature coil or a permanent magnet matching the first fitting, and the two convert the kinetic energy of the transmission shaft into electrical energy through electromagnetic induction.

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