Generator rectifying device

Abstract

The invention discloses a generator rectifying device which comprises a rectifying device and a generator, the rectifying device comprises a rectifying module, a centrifugal fan and a shaft connector, the centrifugal fan comprises an impeller, an impeller shaft, a first end plate and a second end plate, and the first end plate and the second end plate are connected through a plurality of supporting columns to form a centrifugal fan shell. The impeller is coaxially installed between the first end plate and the second end plate, the impeller shaft is coaxially and integrally arranged on the side, close to the first end plate, of the impeller, and the end, away from the impeller, of the impeller shaft penetrates through the first end plate and is coaxially connected with a generator rotor rotating shaft through a shaft connector. The two rectification modules are installed on the side, away from the first end plate, of the second end plate of the centrifugal fan in a mirroring mode, and when a rotor of the generator rotates, the centrifugal fan conducts heat dissipation on the generator and the rectification modules at the same time. The centrifugal fan is arranged on the rectifier module, so that the aim of performing air-cooling heat dissipation on the rectifier module and the generator at the same time is fulfilled.

Description

Technical Field

[0001] This invention belongs to the field of power electronic equipment technology for generators, and more specifically, it is a generator rectifier device. Background Technology

[0002] The rectifier is a crucial component of a generator. Rectifier modules generate significant heat during operation. Current technology typically uses aluminum heat sinks for cooling, but this method has limited cooling capacity, and excessively high temperatures can shorten the rectifier's lifespan. Furthermore, most existing generator rectifiers employ a single rectifier module design, lacking an effective collaborative compensation mechanism at the output. When voltage fluctuations occur in the internal semiconductor devices due to load changes, insufficient DC output stability can easily lead to problems, affecting the normal operation of downstream devices such as energy storage devices. In addition, traditional rectifier cooling relies heavily on fans coaxially driven by the generator rotor. The airflow is tied to the generator speed; under high load conditions, rectifier module losses increase significantly, and temperature rise is substantial, while the generator speed increase is limited. This results in cooling efficiency failing to meet cooling demands, further exacerbating the risk of overheating and damage to components. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a generator rectifier device, which achieves the purpose of air cooling for both the rectifier module and the generator by setting a centrifugal fan on the rectifier module; and ensures the stability of the output voltage of the rectifier device by coordinating the parallel connection of the two rectifier modules and the electrical connection components.

[0004] Technical Solution: To achieve the above objectives, the present invention provides a generator rectifier, comprising a rectifier and a generator. The rectifier includes a rectifier module, a centrifugal fan, and a shaft connector. The centrifugal fan includes an impeller, an impeller shaft, a first end plate, and a second end plate. The first end plate and the second end plate are connected by several support columns to form a centrifugal fan housing. The impeller is coaxially mounted between the first end plate and the second end plate. The side of the first end plate away from the second end plate is mounted on the generator. The impeller shaft is coaxially integrally disposed on the side of the impeller near the first end plate, and the end of the impeller shaft away from the impeller passes through the first end plate and is coaxially connected to the generator rotor shaft through the shaft connector. The shaft connector only allows the torque of the generator rotor shaft to be transmitted unidirectionally to the impeller shaft. Two rectifier modules are mirror-mounted on the side of the second end plate of the centrifugal fan away from the first end plate, and the AC input pins of both rectifier modules are electrically connected to the AC current output terminal of the generator. When the generator rotor rotates, the centrifugal fan simultaneously dissipates heat from both the generator and the rectifier modules.

[0005] Furthermore, each of the rectifier modules includes a housing and a semiconductor electrical component. The housing has mounting ears integrally formed at both ends, and mounting holes are formed on the mounting ears. The semiconductor electrical component is enclosed in the housing. One side of the semiconductor electrical component is provided with several AC input pins, and the other side is provided with several DC output pins. The side of the housing away from the second end plate is provided with several protruding holes corresponding to the semiconductor electrical component. In the assembled state, the several DC output pins of the semiconductor electrical component extend out of the housing through the several protruding holes.

[0006] Furthermore, it also includes a varistor. One end of each of the two rectifier modules is provided with a mounting bracket. The DC output pin of the semiconductor electrical component near the end of the rectifier module is the main output pin, and the remaining DC output pins are sub-output pins. Each of the sub-output pins is connected in parallel to the main output pin through the internal circuit of the semiconductor electrical component. The two mounting brackets are fixedly connected to the housings of the two rectifier modules respectively, and are electrically connected to the main output pin of each rectifier module. The varistor is placed between the two mounting brackets and is electrically connected to both mounting brackets at the same time to form a total voltage detection circuit.

[0007] Furthermore, it also includes several electrical connection components, with the sub-output pins on the two rectifier modules being configured one-to-one. One end of each electrical connection component is connected to the DC output pin of any rectifier module, and the other end is connected to the corresponding DC output pin of the other rectifier module, forming several parallel sub-circuits.

[0008] Furthermore, the centrifugal fan also includes a drive motor, the drive end of which is connected to the impeller drive. Several parallel sub-circuits are simultaneously electrically connected to the drive motor. The electrical connection component is a self-adjusting sliding rheostat structure with a micro stepper motor mounted on it. Each micro stepper motor is electrically connected to its corresponding parallel sub-circuit and can adjust the resistance value of the electrical connection component according to the voltage of the parallel sub-circuit. When the generator is operating under high load or the temperature of the rectifier module is too high, causing the DC voltage output by the total output pin to exceed a preset threshold, the resistance value of the varistor decreases sharply, increasing the DC current output by the rectifier module. At this time, the micro stepper motor adjusts the resistance value of the electrical connection component, ensuring the voltage stability of each parallel sub-circuit and increasing the current input to the drive motor, thereby increasing the speed of the impeller in the centrifugal fan.

[0009] Furthermore, a fuse is connected in series between the parallel sub-circuit and the drive motor. When the current input from the parallel sub-circuit to the drive motor exceeds the rated current, the fuse melts and cuts off the circuit.

[0010] Furthermore, the working principle of a generator rectifier under low load is as follows: When the generator is under low load or the temperature of the rectifier module is low, the voltage of the total voltage detection circuit is lower than a preset threshold, the varistor is in an inactive state, and its resistance approaches infinity; the electrical connection components maintain their initial resistance to ensure stable operation of the two rectifier modules, and the drive motor is in standby mode; at this time, the rotor shaft of the generator drives the impeller to rotate synchronously through the shaft connector and the impeller shaft, and the centrifugal fan simultaneously cools the generator and the rectifier module.

[0011] Furthermore, the working principle of a generator rectifier under high load is as follows: When the generator is under high load or the temperature of the rectifier module is high, the semiconductor electrical components of the rectifier module experience a decrease in forward voltage drop due to thermal effects, causing the voltage of the total voltage detection circuit to exceed a preset threshold. At this time, the varistor is in an activated protection state, its resistance decreases sharply, and the voltage across it is clamped near the activation threshold. The total voltage detection circuit forms a low-resistance path due to the sudden drop in the resistance of the varistor, resulting in a significant increase in the loop current and causing changes in the current distribution of each parallel sub-circuit. The micro stepper motor adjusts the resistance of the corresponding electrical connection component according to the current changes of each parallel sub-circuit to ensure the voltage of each parallel sub-circuit is stable. At the same time, the current input to the drive motor increases, thereby driving it to work and increasing the impeller speed to a speed higher than that of the generator rotor shaft, thereby increasing the cooling airflow and improving the cooling effect of the centrifugal fan on the generator and rectifier module.

[0012] Beneficial Effects: The generator rectifier device of this invention achieves rapid compensation of the voltage at the sub-output pins through the mirrored parallel connection of rectifier modules and the coordinated cooperation of electrical connection components, significantly improving the stability of DC output. The varistor and mounting bracket are connected across modules to form a total voltage detection circuit, which simplifies the structure while realizing synchronous overvoltage protection for dual rectifier modules, preventing overvoltage damage to the downstream power connection structure. The centrifugal fan acts as a heat sink, and the airflow generated during operation dissipates heat efficiently through convection, effectively reducing the temperature of the rectifier module, extending its service life, and simultaneously cooling the generator body. The multi-path redundant power supply structure, in conjunction with fuses, ensures continuous operation of the drive motor and prevents heat dissipation interruption due to a single branch failure. The shaft connector reliably blocks reverse torque transmission, so that the drive motor does not interfere with the generator operation when driving the impeller to accelerate. The combination of the drive motor and centrifugal fan dual design achieves load-adaptive enhanced heat dissipation, improving the overall reliability and safety of the device operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the connection between the rectifier and the generator described in this invention;

[0014] Figure 2 This is a schematic diagram of the rectifier device described in this invention; Detailed Implementation

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] like Figures 1-2 As shown, a generator rectifier includes a rectifier and a generator 4. The rectifier includes a rectifier module 1, a centrifugal fan 2, and a shaft connector 3. The centrifugal fan 2 includes an impeller 5, an impeller shaft 6, a first end plate 7, and a second end plate 8. The first end plate 7 and the second end plate 8 are connected by several support columns to form a centrifugal fan housing. The impeller 5 is coaxially mounted between the first end plate 7 and the second end plate 8. The side of the first end plate 7 away from the second end plate 8 is mounted on the generator 4. The impeller shaft 6 is coaxially and integrally disposed on the side of the impeller 5 near the first end plate 7, and the side of the impeller shaft 6 away from the impeller 5 is... One end of the rectifier module 1 passes through the first end plate 7 and is coaxially connected to the rotor shaft of the generator 4 via the shaft connector 3. The shaft connector 3 only allows the torque of the rotor shaft of the generator 4 to be transmitted unidirectionally to the impeller shaft 6. The shaft connector 3 is selected from connecting components such as an overrunning clutch that can achieve unidirectional transmission. The two rectifier modules 1 are mirror-mounted on the side of the second end plate 8 of the centrifugal fan 2 away from the first end plate 7. The AC input pins of the two rectifier modules 1 are electrically connected to the AC current output terminal of the generator 4. When the rotor of the generator 4 rotates, the centrifugal fan 2 simultaneously cools the generator 4 and the rectifier modules 1. More specifically, both the first end plate 7 and the second end plate 8 are annular plates. The first end plate 7 has a through-hole at its axial center, and the radius of the through-hole is much larger than the radius of the impeller shaft 6, thereby ensuring that the airflow generated by the centrifugal fan 2 can flow into the generator 4. The second end plate 8 also has a through-hole at its axial center. The two rectifier modules 1 are mirror-mounted on both sides of the second ventilator hole on the second end plate 8. The radius of the second ventilator hole is slightly smaller than the radius of the first ventilator hole, thereby providing sufficient installation space for the two rectifier modules 1.

[0017] Each of the rectifier modules 1 includes a housing 9 and a semiconductor electrical component. Both ends of the housing 9 are integrally provided with mounting ears 10, and mounting holes are provided on the mounting ears 10. The semiconductor electrical component is enclosed in the housing 9. One side of the semiconductor electrical component is provided with several AC input pins, and the other side is provided with several DC output pins 11. The side of the housing 9 away from the second end plate 8 is provided with several protruding holes corresponding to the semiconductor electrical component. In the assembled state, the several DC output pins 11 of the semiconductor electrical component pass through the several protruding holes and are outside the housing 9.

[0018] It should be emphasized here that the aforementioned housing 9 is only the housing of the semiconductor electrical components, and not the housing of the entire rectifier module 1. Although the housing of the entire rectifier module 1 is not mentioned above, those skilled in the art should understand that after all the components are assembled, a housing that can enclose the entire rectifier device will be provided on the side of the second end plate 8 away from the first end plate 7. However, this is not the housing 9 described above, but another larger housing. The surface of this larger housing has several holes to ensure that external air can enter the centrifugal fan 2, and that the airflow generated by the centrifugal fan 2 can be discharged into the environment after dissipating heat from the rectifier module 1.

[0019] It also includes a varistor 12. Each of the two rectifier modules 1 has a mounting bracket 16 at one end. The DC output pin 11 of the semiconductor electrical component near any end of the rectifier module 1 is the main output pin 15, and the remaining DC output pins 11 are sub-output pins 13. All sub-output pins 13 are connected in parallel to the main output pin 15 through the internal circuitry of the semiconductor electrical component. The two mounting brackets 16 are respectively fixedly connected to the housing 9 of the two rectifier modules 1 and electrically connected to the main output pin 15 at the end of the semiconductor electrical component of each rectifier module 1. A varistor 12 is disposed between two mounting brackets 16, and the varistor 12 is electrically connected to both mounting brackets 16 to form a total voltage detection circuit, which is the main circuit in the entire loop. Both mounting brackets 16 are made of conductive metal, and one end of each mounting bracket 16 is fastened to the total output pin 15 of the two rectifier modules 1 by fasteners, while the other end is located between the two rectifier modules 1, and the mounting brackets 16 are on the same plane. This ensures that one varistor 12 can simultaneously provide overvoltage protection for the total output voltage of the two rectifier modules 1.

[0020] It also includes several electrical connection components 14, with the sub-output pins 13 on the two rectifier modules 1 corresponding one-to-one. One end of each electrical connection component 14 is connected to any DC output pin 11 of any rectifier module 1, and the other end is connected to any DC output pin 11 of the other rectifier module 1, thereby forming several parallel sub-circuits. Each parallel sub-circuit is a branch in the entire loop. The electrical connection component 14 enables the two rectifier modules 1 to cooperate with each other. When a voltage fluctuation occurs on the sub-output pin 13 of any rectifier module 1, the corresponding sub-output pin 13 on the other rectifier module 1 can be quickly compensated through the electrical connection component 14, thereby improving the stability of the DC output of the rectifier module 1.

[0021] The centrifugal fan 2 also includes a drive motor, the drive end of which is connected to the impeller 5. Several parallel voltage divider circuits are simultaneously electrically connected to the drive motor. Each parallel sub-circuit can independently supply power to the drive motor, forming a multi-path redundant power supply structure. Even if one parallel sub-circuit experiences a power outage due to a fault, the remaining sub-circuits can still ensure the continuous operation of the drive motor, avoiding system failures caused by heat dissipation interruptions. The electrical connection component 14 is a self-adjusting sliding rheostat structure. A micro stepper motor is installed on the electrical connection component 14. Each micro stepper motor on the electrical connection component 14 is electrically connected to each parallel sub-circuit and can adjust the resistance value of the electrical connection component 14 according to the voltage of the parallel sub-circuit. When the generator 4 operates under high load or the temperature of the rectifier module 1 is too high, causing the total output voltage pin 15 to be affected... When the output DC voltage exceeds the preset threshold, the resistance of the varistor 12 decreases sharply, which causes the DC current output by the rectifier module 1 to increase. At this time, the micro stepper motor adjusts the resistance of the electrical connection component 14; thus not only ensuring the stability of the voltage of each parallel sub-circuit, but also increasing the input current of the drive motor, thereby increasing the speed of the impeller 5 in the centrifugal fan 2.

[0022] More specifically, the drive motor is equipped with a current detector, which detects the magnitude of the current supplied to the drive motor by the parallel sub-circuit. The drive motor will only operate when the current reaches a preset value; otherwise, the motor will remain inoperable. Furthermore, in operation, the minimum speed of the drive motor's drive shaft is significantly greater than the maximum speed of the generator 4's rotor shaft. Additionally, a DC-DC converter or inverter is installed between the drive motor and the parallel sub-circuit. The DC-DC converter stabilizes the voltage of the DC current supplied by the parallel sub-circuit, while the inverter converts the DC current supplied by the parallel sub-circuit into AC current usable by the drive motor. If the selected drive motor is a DC motor, an inverter is not required.

[0023] More specifically, the self-adjusting sliding rheostat selected by the electrical connection component 14 has a base plate. During assembly, the base plate is fixedly connected to the housing 9 of the rectifier module 1 to form a pressure plate structure, ensuring that the side of the housing 9 of the two rectifier modules 1 away from the second end plate 8 is on the same horizontal plane. The self-adjusting sliding rheostat in the electrical connection component 14 is fixedly installed on the base plate and is electrically connected to the two rectifier modules 1 at the same time.

[0024] Each of the parallel sub-circuits is connected in series with the drive motor. When the current input from the parallel sub-circuit to the drive motor exceeds the rated current, the fuse melts and cuts off the circuit, thereby preventing the centrifugal fan 2 from stopping due to excessive load.

[0025] The DC current flowing out of the rectifier module 1 can be electrically connected to the power supply structure (energy storage device, etc.) by adding an additional connecting pin on the main output pin 15 or adding an additional connecting pin on each sub-output pin 13.

[0026] When the generator 4 is under low load or the temperature of the rectifier module 1 is low, and the voltage of the total voltage detection circuit is lower than or exceeds a preset threshold, the varistor 12 is inactive and its resistance approaches infinity; the sliding rheostat 10 maintains its initial resistance to ensure stable operation of the two rectifier modules 1, and the impeller drive motor 11 is in standby mode; at this time, the rotor shaft of the generator 4 drives the impeller 5 to rotate synchronously through the shaft connector 3 and the impeller shaft 6, and the centrifugal fan 2 can simultaneously cool the generator 4 and the rectifier module 1.

[0027] When the generator 4 is under high load or the temperature of the rectifier module 1 is high, the semiconductor electrical components of the rectifier module 1 experience a positive voltage drop and degradation due to thermal effects. The output voltage of the total output pin 12 in the rectifier module 1 increases accordingly, causing the voltage of the total voltage detection circuit to exceed a preset threshold. At this time, the varistor 12 is in an activated protection state, its resistance decreases sharply, and the voltage across it is clamped near the activation threshold. The total voltage detection circuit forms a low-resistance path due to the sudden drop in resistance of the varistor 12, resulting in a significant increase in the current throughout the circuit. This increased current leads to an increase in the current allocated to each parallel sub-circuit. If the resistance of each parallel sub-circuit remains constant, the voltage output by each parallel sub-circuit will increase. Excessive voltage can damage the final electrical connection structure (energy storage device, etc.). Therefore, when the varistor 12 is in an activated protection state, each parallel sub-circuit should reduce its resistance to ensure its voltage remains stable, but this does not change the fact that the current increases. The micro stepper motor adjusts the corresponding electrical connection component 14 according to the current changes of each parallel sub-circuit. The resistance value ensures the voltage stability of each parallel sub-circuit. As the current in each parallel sub-circuit increases, the current input to the drive motor also increases, activating the drive motor and putting it into operation. The drive motor drives the impeller 5 to rotate at a speed higher than the rotor shaft speed of the generator 4, thereby increasing the cooling airflow and improving the cooling effect of the centrifugal fan 2 on the generator 4 and the rectifier module 1. Since the shaft connector 3 only allows the torque of the generator 4 rotor shaft to be transmitted unidirectionally to the impeller shaft 6, the speed of the impeller 5 being higher than the speed of the generator 4 rotor shaft will not affect the normal rotation of the generator 4 rotor.

[0028] Furthermore, to ensure the accuracy of the resistance adjustment of the electrical connection component 14 by the micro stepper motor, those skilled in the art can connect a current sensor in series on the connection line between the total output pin 15 of the two rectifier modules 1 and the mounting bracket 16. The current sensor is also electrically connected to each micro stepper motor. The current sensor can monitor the dynamic changes of the total output current in real time, thereby providing a more accurate triggering basis for the adjustment of the micro stepper motor and avoiding the lag in the adjustment of the resistance of the electrical connection component 14. When the total output current fluctuates abnormally, the current sensor can trigger the micro stepper motor to act first and stabilize the voltage of the parallel sub-circuit in advance.

[0029] Furthermore, for the purpose of improving the timely heat dissipation of the centrifugal fan 2, those skilled in the art can place a thermistor close to the semiconductor electrical component on the inner side of the housing 9 of the rectifier module 1. The thermistor is electrically connected to the total voltage detection circuit and can directly sense the actual temperature rise of the semiconductor electrical component. When the temperature of the rectifier module 1 reaches the preset value but the voltage of the total voltage detection circuit has not exceeded the limit, the thermistor can control the micro stepper motor to fine-tune the resistance value of the electrical connection component 14 in advance, thereby stimulating the centrifugal fan 2 to dissipate heat.

[0030] Furthermore, to ensure the accuracy of unidirectional torque transmission between the rotor shaft of generator 4 and impeller shaft 6, those skilled in the art can choose to add an electronic control structure to the shaft connector 3. This solution provides one approach: an electrically operated telescopic block is installed on the circumferential surface of the impeller shaft 6 near the generator 4. The telescopic movement of the block can be controlled remotely or autonomously via a sensor signal connection. A sleeve is coaxially installed on the end of the generator 4 rotor shaft 4 near the impeller shaft 6. The inner wall of the sleeve has a groove corresponding to the telescopic block. In the assembled state, the sleeve is coaxially fitted onto the impeller shaft 6. On the outside; when the generator 4 is under low load or the temperature of the rectifier module 1 is low, the electric telescopic block is engaged in the slot; when the generator 4 is under high load or the temperature of the rectifier module 1 is high, the electric telescopic block retracts and separates from the slot on the inner wall of the sleeve, thus preventing torque transmission between the impeller shaft 6 and the rotor 4. Therefore, it should be understood that regardless of the design of the shaft connector 3, as long as its purpose is to allow the torque of the generator 4 rotor shaft to be transmitted unidirectionally to the impeller shaft 6, these improvements should be within the scope of protection of this solution without bringing any other additional effects.

[0031] Furthermore, if it is only necessary for the impeller 5 of the centrifugal fan 3 to rotate with the rotor shaft of the generator 4, then there is no need to set up a shaft connector and a drive motor. It is only necessary to set the rotor shaft of the generator 4 and the impeller shaft 6 of the centrifugal fan 3 on the same axis, and the electrical connection component 14 can also be made of conductive metal strip.

[0032] The above are the preferred embodiments described in this invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A generator rectifier, characterized in that: The system includes a rectifier and a generator (4). The rectifier includes a rectifier module (1), a centrifugal fan (2), and a shaft connector (3). The centrifugal fan (2) includes an impeller (5), an impeller shaft (6), a first end plate (7), and a second end plate (8). The first end plate (7) and the second end plate (8) are connected by several support columns to form a centrifugal fan housing. The impeller (5) is coaxially mounted between the first end plate (7) and the second end plate (8). The side of the first end plate (7) away from the second end plate (8) is mounted on the generator (4). The impeller shaft (6) is coaxially integrated with the impeller shaft. 5) The impeller shaft (6) is located on the side closest to the first end plate (7), and the end of the impeller shaft (6) away from the impeller (5) passes through the first end plate (7) and is coaxially connected to the rotor shaft of the generator (4) through the shaft connector (3). The shaft connector (3) only allows the torque of the rotor shaft of the generator (4) to be transmitted unidirectionally to the impeller shaft (6). The two rectifier modules (1) are mirror-mounted on the side of the second end plate (8) of the centrifugal fan (2) away from the first end plate (7), and the AC input pins of the two rectifier modules (1) are electrically connected to the AC current output terminal of the generator (4). When the rotor of the generator (4) rotates, the centrifugal fan (2) simultaneously cools the generator (4) and the rectifier modules (1).

2. The generator rectifier according to claim 1, characterized in that: Each of the rectifier modules (1) includes a housing (9) and a semiconductor electrical component. Both ends of the housing (9) are integrally provided with mounting ears (10). The mounting ears (10) are provided with mounting holes. The semiconductor electrical component is enclosed in the housing (9). One side of the semiconductor electrical component is provided with several AC input pins, and the other side is provided with several DC output pins (11). The side of the housing (9) away from the second end plate (8) is provided with several protruding holes corresponding to the semiconductor electrical component. In the assembled state, several DC output pins (11) of the semiconductor electrical component extend out of the housing (9) through several protruding holes.

3. The generator rectifier according to claim 2, characterized in that: It also includes a varistor (12), and each of the two rectifier modules (1) is provided with a mounting bracket (16) at one end. The DC output pin (11) of the semiconductor electrical component near the end of the rectifier module (1) is the total output pin (15), and the remaining DC output pins (11) are sub-output pins (13). Each sub-output pin (13) is connected in parallel to the total output pin (15) through the internal circuit of the semiconductor electrical component. The two mounting brackets (16) are fixedly connected to the housing (9) of the two rectifier modules (1) respectively, and are electrically connected to the total output pin (15) of each rectifier module (1). The varistor (12) is arranged between the two mounting brackets (16) and is electrically connected to both mounting brackets (16) at the same time to form a total voltage detection circuit.

4. The generator rectifier according to claim 1, characterized in that: It also includes several electrical connection components (14), with the sub-output pins (13) on the two rectifier modules (1) being set one-to-one. One end of the electrical connection component (14) is connected to the DC output pin (11) of any rectifier module (1), and the other end is connected to the corresponding DC output pin (11) of the other rectifier module (1), forming several parallel sub-circuits.

5. A generator rectifier according to claim 1, characterized in that: The centrifugal fan (2) also includes a drive motor, the drive end of which is driven and connected to the impeller (5). Several parallel sub-circuits are simultaneously electrically connected to the drive motor. The electrical connection component (14) is a self-adjusting sliding rheostat structure with a micro stepper motor on it. Each micro stepper motor is electrically connected to the corresponding parallel sub-circuit and can adjust the resistance of the electrical connection component (14) according to the voltage of the parallel sub-circuit. When the generator (4) is working under high load or the temperature of the rectifier module (1) is too high, the DC voltage output by the total output pin (15) exceeds the preset threshold. The resistance of the varistor (12) decreases sharply, which increases the DC current output by the rectifier module (1). At this time, the micro stepper motor adjusts the resistance of the electrical connection component (14) to ensure the voltage of each parallel sub-circuit is stable and to increase the current input to the drive motor, thereby increasing the speed of the impeller (5) in the centrifugal fan (2).

6. A generator rectifier according to claim 5, characterized in that: A fuse is connected in series between the parallel sub-circuit and the drive motor. When the current input from the parallel sub-circuit to the drive motor exceeds the rated current, the fuse melts and cuts off the circuit.

7. The working principle of a generator rectifier under low load according to claims 1-5, characterized in that: When the generator (4) is under low load or the temperature of the rectifier module (1) is low, the voltage of the total voltage detection circuit is lower than the preset threshold, the varistor (12) is in an inactive state and its resistance approaches infinity; the electrical connection component (14) maintains the initial resistance value to ensure that the two rectifier modules (1) work stably and the drive motor is in standby state; at this time, the rotor shaft of the generator (4) drives the impeller (5) to rotate synchronously through the shaft connector (3) and the impeller shaft (6), and the centrifugal fan (2) simultaneously dissipates heat from the generator (4) and the rectifier module (1).

8. The working principle of a generator rectifier under high load according to claims 1-5, characterized in that: When the generator (4) is under high load or the temperature of the rectifier module (1) is high, the semiconductor electrical components of the rectifier module (1) will experience a positive voltage drop due to thermal effect, causing the voltage of the total voltage detection circuit to exceed the preset threshold. At this time, the varistor (12) is in the active protection state, its resistance value decreases sharply and the voltage at both ends is clamped near the activation threshold. The total voltage detection circuit forms a low resistance path due to the sudden drop in the resistance value of the varistor (12), which causes the loop current to increase significantly and triggers changes in the current distribution of each parallel sub-circuit. The micro stepper motor adjusts the resistance value of the corresponding electrical connection component (14) according to the current change of each parallel sub-circuit to ensure the voltage of each parallel sub-circuit is stable. At the same time, the current input to the drive motor increases, thereby driving it to work and driving the impeller (5) to increase its speed to a speed higher than that of the rotor shaft of the generator (4), thereby increasing the heat dissipation wind force and improving the heat dissipation effect of the centrifugal fan (2) on the generator (4) and the rectifier module (1).

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