High heat dissipation efficiency pitch system control device

Abstract

This disclosure relates to a high-efficiency heat dissipation control device for a pitch system. The control device includes a housing, a main body, a first fan, a second fan, and a third fan. The housing includes a control cavity, and the main body is located within the control cavity. A first vent is provided on the side of the housing corresponding to the control cavity along its width. The first fan is located at the first vent and is used to exhaust air from the control cavity to the outside of the housing. The second fan is located inside the control cavity and circulates the air within the control cavity. The third fan draws air from outside the housing into the control cavity. The first fan in the main body is configured to cooperate with the second and third fans to dissipate heat from inside the housing to the outside. Thus, the cooperation of the first, second, and third fans helps to create a well-defined airflow path, which improves the heat exchange rate between the air and the heat-generating components, thereby increasing heat dissipation efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation equipment, and more particularly to a high heat dissipation efficiency pitch system control device. Background Technology

[0002] In recent years, high-power wind turbine generators have become a trend. The higher the power of the wind turbine generator, the higher the requirements for the control device of the pitch system. As described in existing technologies such as Chinese invention patents CN115898767A and CN106659088A, the control device of the pitch system integrates high-power devices, such as pitch drivers, IGBT modules, and braking resistors used to drive the pitch motor. During the operation of the pitch system, the heat generated by these high-power devices has a significant impact on the performance of the pitch system. Insufficient heat dissipation will seriously affect the operation of the control device and may even cause the pitch control system to shut down. Utility Model Content

[0003] The purpose of this disclosure is to provide a high heat dissipation efficiency pitch system control device to at least partially solve the above-mentioned technical problems.

[0004] This disclosure provides a high heat dissipation efficiency pitch system control device, which includes a housing, a control device body, a first fan, a second fan, and a third fan. The housing includes a control cavity, the control device body is located in the control cavity, and the housing has a first air vent on the side corresponding to the control cavity along its width direction. The first fan is located at the first vent and is used to exhaust the air from the control chamber to the outside of the housing. The second fan is disposed inside the control cavity, and the second fan circulates the air inside the control cavity; The third fan draws air from outside the housing into the control cavity; The main body of the control device has a first fan configured to cooperate with the second fan and the third fan to conduct heat from inside the box to outside the box.

[0005] In some possible embodiments, the main body of the control device has two first fans, and the housing has first air vents on its first and second sides along its width. The two first fans are respectively positioned within their corresponding first air vents.

[0006] In some possible implementations, the control device body includes a servo driver, and two of the first fans are arranged opposite to the servo driver along the width direction of the housing.

[0007] In some possible implementations, the high heat dissipation efficiency pitch system control device further includes a housing cover and a heat sink, the heat sink being disposed on the housing cover.

[0008] In some possible implementations, the high heat dissipation efficiency pitch system control device further includes a backup power module, the housing further includes a capacitor cavity, the backup power module is located in the capacitor cavity, the control device body is electrically connected to the backup power module, the high heat dissipation efficiency pitch system control device further includes a partition, the partition divides the housing into the capacitor cavity and the control cavity, and the partition is provided with openings.

[0009] In some possible implementations, the high heat dissipation efficiency pitch system control device further includes a braking resistor assembly disposed on the outside of the housing, with a gap between the braking resistor assembly and the housing.

[0010] In some possible implementations, the braking resistor assembly includes a plurality of braking resistors, which are spaced apart along the height direction of the housing.

[0011] In some possible implementations, the braking resistor assembly is located on the side of the housing away from the control cavity.

[0012] In some possible implementations, the high heat dissipation efficiency pitch system control device further includes a heat insulation element disposed between the braking resistor assembly and the housing.

[0013] In some possible implementations, the insulation element includes insulation cotton.

[0014] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: Through the above technical solution, the third fan draws air from outside the housing into the control cavity, the second fan circulates the air within the control cavity, ensuring that the air flows evenly and effectively over the heat-generating components for heat exchange, and the first fan actively expels the heated air from the housing, thus removing heat from inside the housing. The coordination of the first, second, and third fans helps create a well-defined airflow path, which improves the heat exchange rate between the air and the heat-generating components, thereby increasing heat dissipation efficiency. This helps ensure that the power devices within the control cavity operate at a suitable temperature, improving the reliability of the high-heat-dissipation-efficiency pitch control system.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a top view of a high heat dissipation efficiency pitch system control device provided in an embodiment of the present disclosure, without the cover.

[0017] Figure 2 This is a front view schematic diagram of a high heat dissipation efficiency pitch system control device provided in one embodiment of the present disclosure.

[0018] Figure 3 This is a rear view schematic diagram of a high heat dissipation efficiency pitch system control device provided in one embodiment of the present disclosure.

[0019] Figure 4 This is a schematic diagram of the housing cover of a high heat dissipation efficiency pitch system control device provided in one embodiment of the present disclosure.

[0020] Figure 5 This is an enlarged schematic diagram of a switch control provided in one embodiment of this disclosure.

[0021] Figure 6 This is a schematic diagram of the control circuit of a high heat dissipation efficiency pitch system control device provided in one embodiment of the present disclosure.

[0022] Figure 7 This is a top view of the control device of an existing pitch system without the cover.

[0023] Explanation of reference numerals in the attached figures 1-Enclosure; 11-Capacitor cavity; 12-Control cavity; 14-First side; 15-Second side; 2-Control device body; 21-Heater; 22-DC conversion circuit; 23-Switch control; 231-First micro-circuit breaker; 232-First relay; 233-Second micro-circuit breaker; 234-Second relay; 235-Third micro-circuit breaker; 236-Third relay; 237-Fourth micro-circuit breaker; 238-Compound switch; 3-First fan; 4-First air vent; 5-Third fan; 24-Servo driver; 6-Enclosure cover; 7-Heat sink; 8-Baffle; 9-Braking resistor assembly; 91-First braking resistor; 92-Second braking resistor; 10-Heat insulation; 200-External power supply; 110-Capacitor cabinet; 120-Control cabinet. Detailed Implementation

[0024] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0025] It should be understood in this disclosure that, unless otherwise stated, directional terms such as "upper" and "lower" indicate orientation or positional relationships based on the drawing directions shown in the corresponding figures. These terms are used solely for ease of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this disclosure. The terms "inner" and "outer" can refer to the inside or outside of the corresponding component. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not have sequential or importance implications. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0026] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] As mentioned above, the heat dissipation of the pitch system's control unit has a significant impact on the normal operation of the pitch system. In existing technology, the pitch system's control unit mainly includes a backup power module and a control drive module. The backup power module is used to quickly charge and store electrical energy when the pitch motor regenerates energy, and it can also be used for auxiliary power supply when the pitch motor needs to be driven (such as for readjusting the pitch angle). The control drive module is used to receive pitch commands (such as angle and speed) and drive the pitch motor to adjust the blade pitch angle. It mainly includes a pitch driver, a dedicated controller, an IGBT module, and an I / O module.

[0028] Figure 7 This is a schematic diagram of a control device for an existing pitch system. The enclosure contains a capacitor cabinet 110 and a control cabinet 120. The backup power module and braking resistor are located in the capacitor cabinet 110. The control cabinet 120 contains devices such as servo drivers, heaters, IGBT modules, and I / O modules. High-power devices (such as servo drivers and braking resistors) generate a lot of heat during operation, resulting in a high temperature inside the enclosure.

[0029] The servo drive is one of the main sources of heat in the control unit of the pitch system. It amplifies weak control signals into powerful electric drive, and through high-precision closed-loop control, accurately, quickly, and reliably drives the pitch servo motor to adjust the angle of the wind turbine blades. This ultimately achieves the key functions of capturing maximum wind energy, smoothing power output, and safely feathering in case of failure. During operation, the pitch system of a wind turbine generator is constantly making fine adjustments. The frequent starting and braking of the pitch motor results in a large output current from the drive, leading to a sharp increase in heat generation.

[0030] The braking resistor serves to absorb and feed energy, preventing excessive DC bus voltage. When the pitch system needs to quickly retract the pitch (emergency feathering) or when strong winds cause the blades to drive the motor, the servo motor effectively becomes a generator. It converts mechanical energy (the kinetic energy of the blades and wind energy) into electrical energy, which is then fed back to the DC bus circuit through the servo driver's reverse diode. This causes a sharp increase in the voltage of the DC bus capacitor inside the servo driver. If the voltage exceeds the safety limit, it will damage critical components such as the IGBT. By connecting a braking resistor in parallel with the DC bus, when current flows through the braking resistor, the electrical energy is almost entirely converted into heat energy. This regenerated electrical energy is then directed to the braking resistor, preventing excessive bus voltage. The instantaneous power of the braking resistor is typically very high (up to several kilowatts or even tens of kilowatts), generating an extremely large amount of heat instantaneously during a short period of operation.

[0031] In related technologies, the control device of the pitch system mainly achieves heat removal from the enclosure through the cooperation of internal and external fans. The external fan is usually installed at the bottom or side of the enclosure, drawing in cooler air from outside the enclosure. The internal fan agitates the air inside the enclosure, preventing hot air from accumulating locally, ensuring that cool air flows evenly and effectively over the surfaces of all heat-generating components, and exhausting the heated air from the ducts on the enclosure.

[0032] The applicant's research found that the heat dissipation method, which involves drawing in cold air through an external fan and circulating the drawn-in cold air within the enclosure 1 through an internal fan to passively exhaust the hot air after heat exchange through the air duct, has the problem of slow heat dissipation efficiency and cannot effectively reduce the temperature inside the enclosure 1.

[0033] In view of this, such as Figures 1 to 6As shown, this disclosure provides a high heat dissipation efficiency pitch system control device. The high heat dissipation efficiency pitch system control device includes a housing 1, a control device body 2, a first fan 3, a second fan, and a third fan 5. The housing 1 includes a control cavity 12, and the control device body 2 is located in the control cavity 12. The housing 1 has a first air vent 4 on its side corresponding to the control cavity 12 along its own width direction. The first fan 3 is located in the first air vent 4 and is used to exhaust the air from the control cavity 12 to the outside of the housing 1. The second fan is located in the control cavity 12 and circulates the air in the control cavity 12. The third fan 5 draws the air from outside the housing 1 into the control cavity 12. The first fan 3 is configured to cooperate with the second fan and the third fan 5 to conduct the heat inside the housing 1 to the outside of the housing 1.

[0034] Through the above technical solution, the third fan 5 draws air from outside the housing 1 into the control cavity 12, the second fan circulates the air inside the control cavity 12 to ensure that the air flows evenly and effectively over the heat-generating components within the control cavity for heat exchange, and the first fan 3 actively exhausts the heated air from the housing 1, thereby removing heat from inside the housing 1. The cooperation of the first fan 3, the second fan, and the third fan 5 helps create a well-defined airflow path, which improves the heat exchange rate between the air and the heat-generating components, thus increasing heat dissipation efficiency. This helps ensure that the power devices inside the control cavity 12 operate at a suitable temperature, improving the reliability of the high-heat-dissipation-efficiency pitch control system.

[0035] The control unit 2 receives control signals from the main control system of the pitch system. Through internal power devices such as frequency converters and servo drives, it converts and amplifies these signals into the high-power electric drive required to power the pitch motor and other actuators, thereby achieving speed regulation, positioning, and start / stop of the pitch motor. The control unit 2 also integrates components such as a heater, I / O modules, and a power management module.

[0036] The second fan can be an independently set fan, or it can be the fan built into the heater in the high heat dissipation efficiency pitch system control device. Using the fan built into the heater as the second fan can save space in the housing 1, allowing more other devices to be arranged in the housing 1.

[0037] The heater includes a heating element (such as a PTC or resistance wire) and a fan. When the heater is working, the heating element generates heat, and the fan starts simultaneously to blow air over the heating element, circulating the hot air inside the cabinet. The heater is used to maintain a relatively stable and dry microenvironment inside cabinet 1. For example, when the external ambient temperature changes drastically (such as cold nights and rising temperatures during the day), if the surface temperature of the cabinet 1's outer shell is lower than the dew point temperature, water vapor in the air will condense into water droplets on the walls and components of cabinet 1, potentially leading to problems such as short circuits and electrical contact failures. The heater slightly raises the air temperature inside the cabinet, ensuring that the temperature of the cabinet 1's walls and component surfaces remains above the dew point temperature, preventing condensation.

[0038] The third fan 5 can be installed at the bottom or side of the housing 1 to draw air from outside the housing 1 into the housing 1.

[0039] The first fan 3, the second fan, and the third fan 5 work together to dissipate heat from inside the housing 1 to the outside. Specifically, the third fan 5 draws air from outside the housing 1 into the control cavity 12, while the second fan agitates the air inside the control cavity 12, ensuring that the air drawn in from outside the housing 1 flows evenly through the heating elements within the control cavity 12 and undergoes heat exchange. The heated air is then actively exhausted to the outside of the housing 1 by the first fan 3. This active exhaust by the first fan 3 accelerates the removal of hot air from the control cavity 12, thus speeding up the dissipation of heat from within the control cavity 12.

[0040] It is understandable that the first fan 3 can be electrically connected to the control device body 2, and the control device body 2 controls the opening and closing of the first fan 3. It can also provide power to the first fan 3, or set up an independent power supply for the first fan 3. The control device body 2 controls the opening and closing of the first fan 3.

[0041] Similarly, the second fan and the third fan 5 can be electrically connected to the main body 2 of the control device, and the power source for the second fan and the third fan 5 can be the main body 2 of the control device or an independent power source.

[0042] In some embodiments of this disclosure, such as Figure 1 , Figure 5 and Figure 6As shown, the control device body 2 is powered by an external power supply 200, which is a three-phase AC power supply. The output line of the three-phase AC power supply includes three live wires (represented by L1, L2, and L3 in the figure), a neutral wire (represented by N in the figure), and a ground wire (represented by PE in the figure). The control device body 2 is connected to the three live wires to obtain power. The control device body 2 is electrically connected to the third fan 5 to provide power to the third fan 5 and control the on / off state of the third fan 5. The first fan 3 is powered by a DC-DC converter circuit 22. The DC-DC converter circuit 22 obtains AC power input by connecting to the neutral wire N, the ground wire PE, and any one of the live wires (such as the live wire represented by L1) and converts the AC power into DC power suitable for the first fan 3. The heater 21 is connected to the external power supply 200 by the neutral wire N and any one of the live wires (such as the live wire represented by L2) to obtain power.

[0043] To improve the safety of the external power supply 200, a switch control 23, such as a miniature circuit breaker, relay, or composite switch, is added between the devices directly electrically connected to the external power supply 200. The switch control 23 is located in the control cavity 12. The miniature circuit breaker actively disconnects the faulty branch when a problem occurs in the circuit (such as overcurrent or short circuit) without affecting the branch. The relay can receive commands to control the circuit's connection or disconnection. The composite switch is a switching device that combines a magnetic latching relay (or contactor) and a thyristor (silicon controlled rectifier), enabling circuit switching with no inrush current, no arcing, and low power consumption. The relay is electrically connected to the main control device body 2, and the main control device body 2 controls the circuit's connection and disconnection by controlling the relay.

[0044] Specifically, a fourth micro-break 237 and a composite switch 238 are provided between the control device main body 2 and the external power supply 200; a third micro-break 235 is provided between the DC-DC conversion circuit 22 and the external power supply 200; a second micro-break 233, a second relay 234, and a third relay 236 are provided between the heater 21 and the external power supply 200; and a first micro-break 231 and a first relay 232 are provided between the DC-DC conversion circuit 22 and the first fan 3. During the operation of the high-efficiency pitch control system, the control device main body 2 can control the contacts of the first relay 232 to activate the first fan 3, and the contacts of the third relay 236 to activate the fan (second fan) of the heater 21 and the third fan 5, thereby achieving active heat dissipation within the housing 1.

[0045] In some embodiments of this disclosure, a temperature detector is installed inside the housing 1. The temperature detector is electrically connected to the control device body 2. The temperature detector monitors the temperature inside the housing 1. When the detected temperature value exceeds a preset threshold, the control device body 2 controls the first fan 3 and the second fan to turn on for heat dissipation. When the detected temperature value is lower than the preset threshold, the control device body 2 controls the first fan 3 and the second fan to turn off. In this way, the power consumption of the high heat dissipation efficiency pitch system control device can be reduced.

[0046] During the operation of the high-efficiency heat dissipation pitch system control device, a temperature detector monitors the temperature inside the housing 1 in real time. When the detected temperature exceeds a preset threshold, the control device body 2 controls the first fan 3, the second fan, and the third fan 5 to start, thereby achieving active heat dissipation inside the housing 1. The number of the first fan 3, the second fan, and the third fan 5 can be one or more, and this disclosure does not limit this.

[0047] In some embodiments provided in this disclosure, there are two first fans 3, which are arranged opposite to each other on the first side 14 and the second side 15 of the housing 1 along its width. By arranging the first fans 3 on the first side 14 and the second side 15 respectively, the two first fans 3 form an opposite-side layout. The two first fans 3 work together to accelerate the rapid exhaust of the air after heat exchange inside the housing 1. At the same time, the opposite-side layout can avoid the formation of airflow dead zones, prevent low heat dissipation efficiency in local areas inside the housing 1, and help improve the uniformity of temperature distribution inside the housing 1.

[0048] In some embodiments provided in this disclosure, such as Figures 1 to 3 As shown, the main body 2 of the control device includes a servo driver 24, and two first fans 3 are arranged correspondingly to the servo driver 24 along the width direction of the housing 1. The servo driver 24 is the main heat source in the high heat dissipation efficiency pitch system control device. By arranging the two first fans 3 opposite to the servo driver 24 along the width direction of the housing 1, the local circulation path can be shortened, preventing heat from spreading into the entire housing 1 before being discharged, and the airflow resistance is small, which is beneficial to improving heat dissipation efficiency.

[0049] In some embodiments provided in this disclosure, such as Figure 4 As shown, the high-efficiency pitch control system also includes a housing cover 6 and a heat sink 7, with the heat sink 7 disposed on the housing cover 6. This arrangement allows some of the heat-exchanged air within the control chamber 12 to be exhausted through the heat sink 7, thereby further improving heat dissipation efficiency.

[0050] In some embodiments provided in this disclosure, such as Figure 1As shown, the high heat dissipation efficiency pitch system control device also includes a partition 8, which divides the housing 1 into an independent capacitor cavity 11 and a control cavity 12. The partition 8 is provided with openings. In this configuration, the partition 8 can completely isolate the electrical components located in the capacitor cavity 11 and the control cavity 12 respectively, ensuring electrical safety. At the same time, by providing openings in the partition 8, it is beneficial to allow some of the heat in the control cavity 12 to enter the capacitor cavity 11 through the openings, without affecting electrical safety, thus helping to distribute some of the heat in the control cavity 12 and balance the overall temperature distribution inside the housing 1.

[0051] In some embodiments provided in this disclosure, such as Figures 1 to 3 As shown, the high-efficiency pitch control system also includes a braking resistor assembly 9, which is disposed on the outside of the housing 1, with a gap between the braking resistor assembly 9 and the housing 1. Isolating the braking resistor assembly 9 from the housing 1 by means of, for example, a bracket, reduces the heat generated by the braking resistor assembly 9 during operation from being conducted through the side wall of the housing 1 into the housing 1, thus preventing an increase in the temperature inside the housing 1. Furthermore, by placing the braking resistor assembly 9 on the outside of the housing 1, the heat generated by the braking resistor assembly 9 dissipates to the outside, minimizing its impact on the temperature inside the housing 1. This allows the braking resistor assembly 9 to be designed with a higher resistance power to enhance its energy absorption capacity, thereby making the high-efficiency pitch control system suitable for wind turbine generator sets with higher power outputs.

[0052] In some embodiments provided in this disclosure, such as Figure 2 and Figure 3 As shown, the braking resistor assembly 9 includes multiple braking resistors, which are spaced apart along the height of the housing 1. This arrangement helps to increase the heat dissipation area of ​​each braking resistor and improve the heat dissipation effect.

[0053] The number of braking resistors can be two or more, depending on actual needs, and this disclosure does not limit this.

[0054] In some embodiments of this disclosure, the braking resistor assembly 9 includes a first braking resistor 91 and a second braking resistor 92, which are arranged at intervals along the height direction of the housing 1.

[0055] In some embodiments provided in this disclosure, the braking resistor assembly 9 is disposed on the side of the housing 1 away from the control cavity 12. Since the power devices in the control cavity 12 generate a large amount of heat, disposing of the braking resistor assembly 9 on the side of the housing 1 away from the control cavity 12 can reduce or avoid the heat generated by the braking resistor assembly 9 affecting the control cavity 12.

[0056] The braking resistor assembly 9 can be located on the side of the housing 1 away from the control cavity 12 along its width direction, or it can be located on the side of the housing 1 closer to the capacitor cavity 11 along its length direction. This disclosure does not limit this.

[0057] In some embodiments provided in this disclosure, the high heat dissipation efficiency pitch system control device further includes a heat insulation element 10, which is disposed between the braking resistor assembly 9 and the housing 1. This arrangement can further reduce the heat generated by the braking resistor assembly 9 from being conducted into the housing 1.

[0058] The heat insulation component 10 may include heat insulation cotton, which has good heat insulation performance and is beneficial to blocking or reducing the heat generated by the braking resistor assembly 9 from being conducted into the housing 1.

[0059] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0061] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A high heat dissipation efficiency variable pitch system control device, characterized by, The device includes a housing, a control device body, a first fan, a second fan, and a third fan. The housing includes a control cavity, the control device body is located in the control cavity, and the housing has a first air vent on the side corresponding to the control cavity along its width direction. The first fan is located at the first vent and is used to exhaust the air from the control chamber to the outside of the housing. The second fan is disposed inside the control cavity, and the second fan circulates the air inside the control cavity; The third fan draws air from outside the housing into the control cavity; The first fan is configured to work in conjunction with the second fan and the third fan to conduct heat from inside the housing to outside the housing.

2. The high heat dissipation efficiency variable pitch system control device according to claim 1, characterized by, The number of the first fans is two, and the first air vents are respectively provided on the first side and the second side of the housing along its width direction, and the two first fans are respectively set in the corresponding first air vents.

3. The high heat dissipation efficiency pitch system control device according to claim 2, characterized in that, The main body of the control device includes a servo driver, and two first fans are arranged opposite to the servo driver along the width direction of the housing.

4. The high heat dissipation efficiency pitch system control device according to claim 1, characterized in that, The high heat dissipation efficiency pitch system control device also includes a housing cover and a heat sink, wherein the heat sink is disposed on the housing cover.

5. The high heat dissipation efficiency pitch system control device according to claim 1, characterized in that, The high heat dissipation efficiency pitch system control device also includes a backup power module. The housing also includes a capacitor cavity. The backup power module is located inside the capacitor cavity. The main body of the control device is electrically connected to the backup power module. The high heat dissipation efficiency pitch system control device also includes a partition, which divides the housing into the capacitor cavity and the control cavity, and the partition is provided with openings.

6. The high heat dissipation efficiency pitch system control device according to any one of claims 1-5, characterized in that, The high heat dissipation efficiency pitch system control device also includes a braking resistor assembly, which is disposed on the outside of the housing and has a gap between it and the housing.

7. The high heat dissipation efficiency pitch system control device according to claim 6, characterized in that, The braking resistor assembly includes multiple braking resistors, which are spaced apart along the height direction of the housing.

8. The high heat dissipation efficiency pitch system control device according to claim 6, characterized in that, The braking resistor assembly is located on the side of the housing away from the control cavity.

9. The high heat dissipation efficiency pitch system control device according to claim 6, characterized in that, The high heat dissipation efficiency pitch system control device also includes a heat insulation component, which is disposed between the braking resistor assembly and the housing.

10. The high heat dissipation efficiency pitch system control device according to claim 9, characterized in that, The heat insulation component includes heat insulation cotton.

Images