Electrically-driven gas turbine generator set

Abstract

The utility model provides an electric drive gas turbine generator set, the electric drive gas turbine generator set comprises a gas turbine and a starting motor, the gas turbine is connected with a gas turbine control device, the starting motor is connected with a generator and a frequency conversion control device, an overrun clutch is arranged between the starting motor and the gas turbine, and the frequency conversion control device is connected with the overrun clutch. The starting motor starts the gas turbine through the frequency conversion control device. According to the embodiment of the utility model, the gas turbine can be quickly started through the motor and the frequency conversion device, timely response can be realized in case of emergency, parts such as the motor can be arranged in a limited space, and the weight of the whole unit is simplified.

Description

Technical Field

[0001] This utility model relates to the technical field of gas turbines, and more specifically, to an electric-driven gas turbine generator set. Background Technology

[0002] Gas turbines typically use hydraulic starting systems, but vehicle-mounted mobile equipment faces weight and height restrictions on road use. Traditional hydraulic starting systems are quite heavy, resulting in overweight vehicles that cannot be effectively used on roads, thus hindering the development of gas turbines in vehicle-mounted mobile equipment.

[0003] Currently, gas turbines are generally started using either hydraulic starting or conventional variable frequency motors. Starting a gas turbine using a hydraulic motor requires a hydraulic system, which includes an electric motor, oil tank, oil pump, valves, and piping. Traditional hydraulic starter systems are quite heavy, causing the vehicle to be overweight and impairing its roadworthiness. There is also a risk of piping leaks, frequently resulting in hydraulic oil leaks that contaminate the internal space and increase cleaning workload. In winter, the low temperature and high viscosity of the lubricating oil often lead to start-up failures. Therefore, preheating the lubricating oil is necessary to reduce its viscosity, requiring an additional heating system and increasing costs. This also results in excessively long start-up times and delayed response in emergencies. However, starting a gas turbine using an electric motor is a more efficient option. Since a conventional variable frequency motor starter system consists only of an electric motor, inverter, and wiring, it is simpler and significantly lighter than a hydraulic starter system. However, gas turbines have a compact design and limited installation space, and conventional variable frequency motors are much larger than hydraulic starter motors, making direct installation at pre-existing openings difficult. Measures such as adding gearbox adapters are needed, which increases the usable space and leads to problems such as increased overall weight. In addition, existing gas turbines often only perform a single start-up operation, and the pre-ventilation and pre-ignition purging processes cannot be achieved during the start-up process. Utility Model Content

[0004] In view of this, the present invention aims to provide an electric-driven gas turbine generator set to solve the above-mentioned technical problems in the prior art.

[0005] This utility model provides an electric-driven gas turbine generator set, including a gas turbine and a starter motor. The gas turbine is connected to a gas turbine control device, and the starter motor is connected to a generator and a frequency converter control device. An overrunning clutch is provided between the starter motor and the gas turbine, and the starter motor starts the gas turbine through the frequency converter control device.

[0006] In some embodiments, the gas turbine includes a gearbox and a combustion chamber, the gearbox being connected to the output end of the overrunning clutch.

[0007] In some embodiments, an exhaust valve and a fuel metering valve are provided between the gas turbine control device and the combustion chamber.

[0008] In some embodiments, a shut-off valve is provided on the upstream and / or downstream side of the exhaust valve.

[0009] In some embodiments, a motor control device is also included, which is connected to the gas turbine control device and the auxiliary device, and the gas turbine control device controls the auxiliary device through the motor control device.

[0010] In some embodiments, the auxiliary device includes a ventilation device for ventilating the gearbox before startup and purging it during startup.

[0011] In some embodiments, the auxiliary device includes a lubrication device for lubricating the gearbox.

[0012] In some embodiments, the starter motor includes a housing, an oil inlet and an oil outlet are provided on the housing, and a heat dissipation pipe is provided between the starter motor and the lubrication device, the heat dissipation pipe being connected to the oil inlet and the oil outlet.

[0013] In some embodiments, the starter motor includes a housing, the overrunning clutch is disposed in the housing, and the starter motor cable is led directly out from the housing.

[0014] In some embodiments, a wiring adapter box is further provided between the generator and the starter motor, and the cable of the starter motor is led to the wiring adapter box.

[0015] This utility model embodiment can quickly start the gas turbine through a motor and frequency converter, can respond promptly in case of emergency, and can also make use of limited space to install components such as motors, simplifying the weight of the overall unit.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method. The drawings described herein are provided to offer a further understanding of the invention and form part of this application. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of an electric-driven gas turbine generator set installed on a semi-trailer, as provided in an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of the component connections within the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0021] Figure 4 This is a partial schematic diagram of the component connections within the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0022] Figure 5 This is one of the structural schematic diagrams of the motor in the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0023] Figure 6 This is the second schematic diagram of the structure of the motor in the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the steps of the control method for the electric-driven gas turbine generator set provided in this embodiment of the utility model;

[0025] Figure 8 This is a flowchart illustrating the control method for an electric-driven gas turbine generator set provided in this embodiment of the present invention.

[0026] Figure label:

[0027] 100-Gas turbine; 110-Gas turbine control unit; 120-Gearbox; 130-Combustion chamber; 140-Fuel metering valve; 150-First shut-off valve; 160-Exhaust valve; 170-Second shut-off valve; 200-Motor; 201-House; 202-Oil inlet; 203-Oil outlet; 204-Power supply cable; 25-Control cable; 210-Motor control unit; 220-Variable frequency control unit; 300-Generator; 400-Overrunning clutch; 500-Wiring adapter box; 600-Lubrication device; 700-Ventilation device. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but these are not intended to limit the scope of the present invention.

[0029] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0030] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0031] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0032] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0033] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0034] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0037] The first embodiment of this utility model provides an electric-driven gas turbine generator set, such as... Figures 1-4 As shown, it includes a gas turbine 100 and a starter motor 200, which is connected to the gas turbine 100 for starting the gas turbine 100. The starter motor 200 may be, for example, a permanent magnet synchronous motor. The gas turbine 100 is connected to a gas turbine control unit 110 (TCP), which controls both the gas turbine 100 and the starter motor 200. Furthermore, the starter motor 200 is connected to a generator 300, which provides electrical energy to the starter motor 200. The generator 300 may be a diesel generator.

[0038] Furthermore, a motor control device 210 and a variable-frequency drive (VFD) are provided between the generator 300 and the starter motor 200. The motor control device 210 is connected to auxiliary devices such as the lubrication device 600 and the ventilation device 700. The motor control device 210 is used to control the motors in the lubrication device 600 and / or the ventilation device 700. Specifically, the lubrication device 600 is used to lubricate the gearbox 120 of the gas turbine 100, and the ventilation device 700 is used to ventilate the gearbox 120 of the gas turbine 100. The gas turbine control device 110 controls the starting and stopping of the motors in the lubrication device 600 and / or the ventilation device 700 through the motor control device 210.

[0039] In this embodiment, the gas turbine control device 110 controls the starter motor 200 through the frequency converter control device 220. Here, by using the combination of the frequency converter control device 220 and the starter motor 200 to replace the traditional hydraulic motor starting method, the electric drive can replace the hydraulic drive for starting.

[0040] Furthermore, an overrunning clutch 400 is provided between the starter motor 200 and the gas turbine 100. In this embodiment, the starter motor 200 and the overrunning clutch 400 can be installed together; for example, the overrunning clutch 400 can be installed in the motor housing of the starter motor 200. The input end of the overrunning clutch 400 is connected to the output shaft of the starter motor 200, and the output end of the overrunning clutch 400 is connected to the gas turbine 100. When the overrunning clutch 400 is engaged, the rotation of the starter motor 200 overcomes the torque of the gas turbine 100, thereby driving the gas turbine 100 to rotate.

[0041] In addition, the gas turbine 100 includes a gearbox 120 and a combustion chamber 130, the gearbox 120 being connected to the output end of the overrunning clutch 400, and the combustion chamber 130 being used for burning fuel.

[0042] The starter motor 200 of this embodiment is used to start the gas turbine 100. The overrunning clutch 400 can engage and disengage during the start-up process based on the speed change at the input end. When the overrunning clutch 400 is engaged, the starter motor 200 drives the gas turbine 100 to rotate. When the speed of the starter motor 200 reaches the predetermined speed of the gas turbine 100, the power transmission between the starter motor 200 and the overrunning clutch 400 is disconnected due to the characteristics of the overrunning clutch 400.

[0043] In addition, an exhaust valve 160 and a fuel metering valve 140 are provided between the gas turbine control device 110 and the combustion chamber 130. A first shut-off valve 150 is provided on the upstream side of the exhaust valve 160, and a second shut-off valve 170 is provided on the downstream side of the exhaust valve 160.

[0044] The components within the electric-driven gas turbine generator set are connected by cables. For example, the power cable of the generator 300 is connected to the input terminal of the motor control device 210, the output terminal of the motor control device 210 is connected to the input terminal of the frequency converter control device 220 via a power cable, and the output terminal of the frequency converter control device 220 is connected to the wiring adapter box 500 via a control cable. The gas turbine control device 110 and the frequency converter control device 220 are connected via control cables and communication cables, thereby enabling the reading of the operating data of the starter motor 200, thus protecting and controlling the unit.

[0045] Therefore, a wiring adapter box 500 is also provided between the generator 300 and the starter motor 200. The wiring adapter box 500 is used to transfer different types of cables, such as power cables, control cables, and communication cables.

[0046] In this embodiment, the starter motor 200 is preferably a permanent magnet synchronous motor. During the entire start-up process, the permanent magnet synchronous motor utilizes its own physical material properties to operate beyond its rated power under overload conditions. As long as the stator winding temperature and peak current do not exceed the limits, the permanent magnet synchronous motor can continuously operate under overload. Taking advantage of the strong overload capacity of the permanent magnet synchronous motor, the power selection of the starter motor does not need to match the highest operating conditions during operation, thus its size and volume can be much smaller than a conventional three-phase asynchronous motor with the same function. In this embodiment, using a small-capacity permanent magnet synchronous motor in conjunction with a high-power frequency converter can meet the usage requirements. During the operation of the starter motor 200, the temperature of the motor windings will rise depending on the power, so the starter motor 200 needs timely heat dissipation during operation.

[0047] Therefore, such as Figure 5 and Figure 6 As shown, the starter motor 200 includes a housing 201, on which an oil inlet 202 and an oil outlet 203 are provided. A heat dissipation pipe is provided between the starter motor 200 and the lubrication device 600. The heat dissipation pipe is connected to the oil inlet and oil outlet on the starter motor 200 and to the lubrication device 600. In this way, the lubrication device 600 of the gas turbine 100 can be used to achieve oil cooling lubrication of the starter motor 200, so that no additional system is needed, eliminating the need for traditional air cooling devices or independent liquid cooling devices.

[0048] Furthermore, to minimize the motor's size and maximize the use of the installation space near the gas turbine 100, the starter motor 200 in this embodiment does not have a conventionally provided junction box, and the wiring method has been adjusted. The power supply cable 204 and control cable 205 of the starter motor 200 are directly led out from the housing 201, further reducing the overall size of the starter motor 200. Specifically, since the power supply and control cables of the starter motor 200 are directly led out from inside the housing 201, there is no need for a bulky junction box, further reducing the size of the starter motor 200 and the overall installation space.

[0049] In addition, in order to monitor the operation of the starter motor 200, the starter motor 200 is equipped with components such as a stator winding temperature sensor, a bearing temperature sensor, and a rotary encoder. The power supply of the above-mentioned sensors and other components, as well as the starter motor 200, is led out through injection-molded cables and connected to the wiring adapter box 500.

[0050] Specifically, when the starter motor 200 is running, the cooler oil enters from the oil inlet 202 and exchanges heat with the starter motor 200 to cool it. Then the hot oil flows out from the oil outlet 203 and returns to the lubrication device 600, for example, the oil tank, so that the lubricating oil in the lubrication device 600 can dissipate heat. This allows the starter motor 200 to operate within a reasonable temperature range.

[0051] This embodiment has a compact structure and a low overall weight angle, such as Figure 2 As shown, the electric-driven gas turbine generator set involved in this embodiment can also be mounted on, for example, a semi-trailer, so that the electric-driven gas turbine generator set can operate in different locations as needed.

[0052] In this embodiment, the starting of the gas turbine 100 requires the collaborative support of multiple devices. The generator 300 provides external power to the gas turbine 100 when it is not running. The gas turbine control device 110 determines whether the starting conditions are met based on information from external sensors, thereby controlling the starting and stopping of the gas turbine 100. In particular, it controls the opening and closing of the aforementioned shut-off valve, exhaust valve, and metering valve to achieve ignition and speed control. The motor control device 210 controls the starting and stopping of the lubrication device 600 and the ventilation device 700, and the frequency converter control device 220 controls the starting, stopping, and speed control of the starter motor 200.

[0053] Based on the above-mentioned electric-driven gas turbine generator set, a control method for the electric-driven gas turbine generator set can be implemented, such as... Figure 7 and Figure 8As shown, it includes the following steps:

[0054] S101, the gas turbine control device determines whether the start-up conditions are met. When the start-up conditions are met, the gas turbine control device sends the first start-up signal to the lubrication device and the ventilation device through the motor control device.

[0055] S102, after a predetermined time following the issuance of the start signal, the gas turbine control unit sends a second start signal to the frequency converter control unit. The frequency converter control unit controls the motor to accelerate to the first preset speed stage based on the first preset frequency, and purifies the gas turbine through the ventilation device.

[0056] S103, after the purging process is completed, the gas turbine control unit sends a third start signal to the frequency converter control unit. The frequency converter control unit controls the motor to speed up to the second preset speed stage based on the second preset frequency, and controls the gas turbine to perform ignition operation.

[0057] S104, after successful ignition and when the motor reaches its maximum speed, controls the overrunning clutch to disengage the motor from the gas turbine.

[0058] Preferably, the ignition operation of the gas turbine includes: opening the first and second shut-off valves and closing the exhaust valve through the gas turbine control device; opening the fuel metering valve to a predetermined opening degree to allow fuel to enter the combustion chamber of the gas turbine, and igniting the fuel through the igniter in the combustion chamber.

[0059] Based on the above steps and flowchart, the control and operation process of the electric-driven gas turbine generator set in this embodiment is as follows:

[0060] The generator 300 starts to provide 480V electrical energy from the outside. The gas turbine control device 110 acquires the fuel supply pressure in real time and determines whether the start-up conditions are met based on the acquired external sensors and its own status. If the start-up conditions are met, the gas turbine control device 110 sends a first start signal to the motors of the lubrication device 600 and the ventilation device 700 through the motor control device 210, ensuring that the gearbox 120 in the gas turbine 100 can be lubricated and ventilated in advance.

[0061] Furthermore, after the gas turbine control device 110 receives a signal indicating, for example, the start of the ventilation device 700, it delays for a predetermined time, such as 30 seconds, and then sends a second start signal to the frequency converter control device 220. After receiving the signal, the frequency converter control device 220 loads a first preset frequency preset inside the frequency converter control device 220. The frequency converter control device 220 controls the starter motor 200 to drive the gas turbine 100 to rotate according to the first preset frequency and the ramp set speed, and causes the starter motor 200 to accelerate to the first preset speed stage.

[0062] During the startup process of the starter motor 200, the frequency converter control device 220 monitors the winding temperature, bearing temperature, and rotational speed of the starter motor 200 to complete the protection and closed-loop speed control of the starter motor 200. When the starter motor 200 reaches the first preset speed stage, the gas turbine 100 is purged at a constant speed.

[0063] After the purging process with a predetermined time is completed, the gas turbine control device 110 outputs a third start signal for the second preset speed stage to the frequency converter control device 220. After receiving the third start signal, the frequency converter control device 220 starts loading the second preset frequency preset inside. Based on the second preset frequency, the speed of the starter motor 200 and the gas turbine 100 increases synchronously, and the starter motor 200 speeds up to the second preset speed stage.

[0064] During the process of the starter motor 200 accelerating to the second preset speed stage, the ignition process of the gas turbine 100 is triggered. Specifically, the gas turbine control device 110 opens the first shut-off valve 150 located upstream, the second shut-off valve 170 located downstream, and closes the exhaust valve 160, and opens the fuel metering valve 140 to a predetermined opening degree, so that fuel enters the combustion chamber 130 of the gas turbine 100, and the fuel is ignited by the igniter in the combustion chamber 130.

[0065] After successful ignition, the air pressure from fuel expansion gradually reduces the torque required by the starter motor 200 for the gas turbine 100. Once the starter motor 200 reaches its maximum speed, the overrunning clutch 400 is controlled to disengage the starter motor 200 from the gas turbine 100. Simultaneously, the gas turbine control device 110 stops sending signals to the frequency converter control device 220, and the starter motor 200 begins to decelerate freely. The gas turbine 100 subsequently controls its speed by continuously burning fuel and controlling the fuel intake air volume, for example, by increasing the speed to the warm-up speed, delaying at the warm-up speed for 5 minutes, and then increasing the speed again to reach the final rated speed.

[0066] This utility model embodiment can quickly start the gas turbine through a motor and frequency converter, can respond promptly in case of emergency, and can also make use of limited space to install components such as motors, simplifying the weight of the overall unit.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0068] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0069] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0070] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0071] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0072] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0073] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An electric-driven gas turbine generator set, characterized in that, It includes a gas turbine and a starter motor. The gas turbine is connected to a gas turbine control device, and the starter motor is connected to a generator and a frequency converter control device. An overrunning clutch is provided between the starter motor and the gas turbine. The starter motor starts the gas turbine through the frequency converter control device.

2. The electric-driven gas turbine generator set according to claim 1, characterized in that, The gas turbine includes a gearbox and a combustion chamber, and the gearbox is connected to the output end of the overrunning clutch.

3. The electric-driven gas turbine generator set according to claim 2, characterized in that, An exhaust valve and a fuel metering valve are provided between the gas turbine control device and the combustion chamber.

4. The electric-driven gas turbine generator set according to claim 3, characterized in that, A shut-off valve is provided on the upstream and / or downstream side of the exhaust valve.

5. The electric-driven gas turbine generator set according to claim 2, characterized in that, It also includes a motor control device, which is connected to the gas turbine control device and the auxiliary device, and the gas turbine control device controls the auxiliary device through the motor control device.

6. The electric-driven gas turbine generator set according to claim 5, characterized in that, The auxiliary device includes a ventilation device, which is used to ventilate the gearbox before startup and to purge it during startup.

7. The electric-driven gas turbine generator set according to claim 5, characterized in that, The auxiliary device includes a lubrication device for lubricating the gearbox.

8. The electric-driven gas turbine generator set according to claim 7, characterized in that, The starter motor includes a housing, on which an oil inlet and an oil outlet are provided. A heat dissipation pipe is provided between the starter motor and the lubrication device, and the heat dissipation pipe is connected to the oil inlet and the oil outlet.

9. The electric-driven gas turbine generator set according to claim 1, characterized in that, The starter motor includes a housing, the overrunning clutch is disposed in the housing, and the starter motor cable is led out directly from the housing.

10. The electric-driven gas turbine generator set according to claim 9, characterized in that, A wiring adapter box is also provided between the generator and the starter motor, and the cable of the starter motor is led to the wiring adapter box.

Images