Electric ship propulsion system with temperature protection and protection method thereof

Abstract

The invention provides an electric ship propulsion system with temperature protection and a protection method thereof.The electric ship propulsion system comprises a left propeller and a right propeller, the left propeller and the right propeller are connected to the output end of a left speed reducer and the output end of a right speed reducer correspondingly, and the left speed reducer and the right speed reducer are connected with two motors correspondingly; the two motors connected to the left speed reducer are connected with a first energy management device through a left inverter, and the two motors connected to the right speed reducer are connected with a second energy management device through a right inverter; the motor temperature detection devices are connected with the motors, the left inverter and the right inverter are respectively integrated with two control modules, and each control module is connected with one motor temperature detection device and is used for controlling the operation strategy of the corresponding motor according to the detection result of the motor temperature detection device. The control module comprises a detection fault judgment unit which is used for judging whether the motor temperature detection device works normally or not. The problems that in the prior art, due to the double-main-engine double-propeller mode and the single temperature fault processing strategy of an electric ship propelling system, an electric ship is likely to stop, and the whole ship drifts on the water surface are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of electric ship propulsion systems, and more specifically, relates to an electric ship propulsion system with temperature protection and a protection method thereof. Background Technology

[0002] With national policies supporting and promoting the new energy ship industry, orders for electric ships have increased exponentially. Whether for ocean-going vessels or inland waterway vessels, the adoption of electric propulsion systems is the mainstream trend in the industry. The electric motor, as the power source that converts electrical energy into mechanical energy output, is the core component of the electric propulsion system. The operating principle of the electric motor is that the rotating magnetic field generated by the alternating current flowing through the stator windings interacts with the rotor magnetic field to drive the rotor to rotate. When current flows through the windings, a temperature rise occurs. Excessive temperature rise and inadequate heat dissipation can lead to problems such as limited ship power or motor burnout, posing significant safety hazards. Currently, monitoring the motor temperature on the entire ship mainly relies on the temperature acquisition and monitoring of the motor's own thermistors. When the motor temperature is too high, power reduction or disconnection of the entire ship's power is usually used to protect the motor and the safety of the entire ship. Existing electric ships are basically dual-main-engine, dual-propeller, meaning each propeller is driven by one motor. When there is a demand for high-power motors, the market demand for motor resources is high, and the cost is expensive. At the same time, when the motor and electronic control temperature fails, the fault of the temperature sensor itself is not taken into account. The fault is directly shut down, and the fault handling strategy is very simple, which can easily lead to the machine stopping and the boat stopping, with the whole boat drifting on the water. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an electric ship propulsion system with temperature protection and its protection method. This solves the problem that existing electric ship propulsion systems with dual main engines and dual propellers and a single temperature fault handling strategy are prone to causing the electric ship to stop, become stuck, or drift on the water.

[0004] To achieve the above objectives, the present invention provides an electric ship propulsion system with temperature protection, comprising: A left propeller and a right propeller are respectively connected to the output ends of a left reducer and a right reducer. The left reducer and the right reducer are respectively connected to two motors. The two motors connected to the left reducer are connected to a first energy management device through a left inverter. The two motors connected to the right reducer are connected to a second energy management device through a right inverter. A motor temperature detection device is provided, which is connected to the motor. The left inverter and the right inverter each integrate two control modules. Each control module is connected to one of the motor temperature detection devices and is used to control the operating strategy of the corresponding motor based on the detection results of the motor temperature detection device. The control module includes a fault detection and judgment unit, which is used to determine whether the motor temperature detection device is working properly.

[0005] Optionally, the system also includes an inverter temperature detection device connected to the left inverter and the right inverter. Each control module is connected to one inverter temperature detection device and is used to control the operating strategy of the corresponding motor based on the detection result of the inverter temperature detection device. The fault judgment unit is used to determine whether the inverter temperature detection device is working properly.

[0006] Optionally, the fault detection and judgment unit includes a voltage detection unit and / or a resistance detection unit. The voltage detection unit is used to detect the power supply voltage of the motor temperature detection device and the inverter temperature detection device, and the resistance detection unit is used to detect the resistance of the motor temperature detection device and the inverter temperature detection device.

[0007] Optionally, the left inverter and the right inverter are each provided with two independent outputs, both of which are dual-motor inverters.

[0008] Optionally, the two motors connected to the left reducer are a first left motor and a second left motor, and the two motors connected to the right reducer are a first right motor and a second right motor. The first left motor and the second left motor are respectively connected to the two independent outputs of the left inverter, and the first right motor and the second right motor are respectively connected to the two independent outputs of the right inverter.

[0009] Optionally, the motor temperature detection device includes a first left motor temperature detection device, a second left motor temperature detection device, a first right motor temperature detection device, and a second right motor temperature detection device. The inverter temperature detection device includes a left inverter temperature detection device and a right inverter temperature detection device. The two control modules integrated in the left inverter are a first left control module and a second left control module, respectively. The two control modules integrated in the right inverter are a first right control module and a second right control module, respectively. The first left control module is connected to the first left motor temperature detection device and the left inverter temperature detection device. The second left control module is connected to the second left motor temperature detection device and the left inverter temperature detection device. The first right control module is connected to the first right motor temperature detection device and the right inverter temperature detection device. The second right control module is connected to the second right motor temperature detection device and the right inverter temperature detection device.

[0010] Optionally, the operating strategy includes a first power reduction strategy and a second power reduction strategy, wherein the power reduction percentage of the first power reduction strategy is less than the power reduction percentage of the second power reduction strategy. The control module can execute the first power reduction strategy when the detection result of the motor temperature detection device is not less than a first set value and not greater than a second set value, and can execute the second power reduction strategy when the detection result of the motor temperature detection device is not less than the second set value.

[0011] Optionally, the motor temperature detection device includes a motor bearing temperature sensor and a motor winding temperature sensor.

[0012] The present invention also provides a protection method for an electric ship propulsion system with temperature protection, the electric ship propulsion system with temperature protection described above comprising: The motor temperature is collected by a motor temperature detection device during normal ship navigation. The fault detection unit determines whether the motor temperature detection device is working properly. If the motor temperature detection device is working normally, the detection result of the motor temperature detection device is input into the control module and compared with the first set value and the second set value in turn. When the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed. After the first power reduction strategy is executed for a set time, the detection result of the motor temperature detection device is input into the control module again and compared with the first set value and the second set value in turn. If the detection result of the motor temperature detection device is less than the first set value, the normal power is restored. If the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed until the shore is reached. When the detection structure of the motor temperature detection device is not less than the second set value, the second power reduction strategy is executed until the vehicle reaches the shore.

[0013] Optionally, it also includes: If the motor temperature detection device malfunctions, a temperature acquisition fault alarm will be triggered, and normal power will be maintained. After triggering a temperature acquisition fault alarm, the fault detection and judgment unit will again determine whether the motor temperature detection device is working properly. If the motor temperature detection device is working properly, the ship will sail normally. If the motor temperature detection device is not working properly, the second power reduction strategy will be implemented until the ship reaches the shore.

[0014] This invention provides an electric ship propulsion system with temperature protection and its protection method. The beneficial effects are as follows: This electric ship propulsion system with temperature protection uses two main engines (left and right) to drive two propellers. The left and right reducers each have two input interfaces and one output interface. The output interface is connected to the propeller, and the input interface is connected to two motors, forming a parallel dual-motor structure. The left and right inverters control the two motors respectively. The power output of the two parallel motors converges into one reducer, which has a single-shaft output. This provides a higher power propulsion output for the electric ship without the need for a large-capacity reducer. The use of industrial motors reduces power requirements and costs, and enables redundant power design, improving the safety and reliability of electric ships. Simultaneously, the left and right inverters each integrate two control modules, each containing a fault detection and judgment unit. This not only receives data from the motor temperature detection device and formulates independent operating strategies for each motor, but also diagnoses faults in the temperature detection device, improving control accuracy. Combined with the aforementioned design of dual main engines driving dual propellers, this significantly reduces the likelihood of temperature-related ship malfunctions causing shipwrecks and the entire vessel drifting on the water.

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

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0017] Figure 1 A schematic diagram of the propulsion structure of an electric ship propulsion system with temperature protection according to an embodiment of the present invention is shown.

[0018] Figure 2A schematic diagram of a temperature detection structure for an electric ship propulsion system with temperature protection according to an embodiment of the present invention is shown.

[0019] Figure 3 A flowchart illustrating a protection method for an electric ship propulsion system with temperature protection according to an embodiment of the present invention is shown.

[0020] Explanation of reference numerals in the attached figures: 1. Left propeller; 2. Right propeller; 3. Left gearbox; 4. Right gearbox; 5. First left motor; 6. Second left motor; 7. First right motor; 8. Second right motor; 9. Left inverter; 10. Right inverter; 11. First energy management device; 12. Second energy management device; 13. First left control module; 14. Second left control module; 15. First right control module; 16. Second right control module; 17. Left inverter temperature detection device; 18. Right inverter temperature detection device; 19. First left motor front bearing temperature sensor; 20. First left motor rear bearing temperature sensor; 21. Second left motor front bearing temperature sensor; 22. Second left motor rear bearing temperature sensor; 23. First left motor front winding temperature sensor ; 24. Temperature sensor of the middle winding of the first left motor; 25. Temperature sensor of the rear winding of the first left motor; 26. Temperature sensor of the front winding of the second left motor; 27. Temperature sensor of the middle winding of the second left motor; 28. Temperature sensor of the rear winding of the second left motor; 29. ​​Temperature sensor of the front bearing of the first right motor; 30. Temperature sensor of the rear bearing of the first right motor; 31. Temperature sensor of the front bearing of the second right motor; 32. Temperature sensor of the rear bearing of the second right motor; 33. Temperature sensor of the front winding of the first right motor; 34. Temperature sensor of the middle winding of the first right motor; 35. Temperature sensor of the rear winding of the first right motor; 36. Temperature sensor of the front winding of the second right motor; 37. Temperature sensor of the middle winding of the second right motor; 38. Temperature sensor of the rear winding of the second right motor. Detailed Implementation

[0021] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022] like Figure 1 and Figure 2 As shown, the present invention provides an electric ship propulsion system with temperature protection, comprising: Left propeller 1 and right propeller 2 are respectively connected to the output terminals of left reducer 3 and right reducer 4. Left reducer 3 and right reducer 4 are respectively connected to two motors. The two motors connected to left reducer 3 are connected to the first energy management device 11 through left inverter 9. The two motors connected to right reducer 4 are connected to the second energy management device 12 through right inverter 10. The motor temperature detection device is connected to the motor. The left inverter 9 and the right inverter 10 each integrate two control modules. Each control module is connected to a motor temperature detection device and is used to control the operation strategy of the corresponding motor based on the detection results of the motor temperature detection device. The control module includes a fault detection judgment unit, which is used to determine whether the motor temperature detection device is working properly.

[0023] Specifically, to address the problems of existing electric ship propulsion systems with dual main engines and dual propellers, and their reliance on a single temperature fault handling strategy, which easily leads to engine shutdown, ship stoppage, and even the entire vessel drifting on the water, this invention provides an electric ship propulsion system with temperature protection. The system consists of two main engines driving two propellers. The left reducer 3 and right reducer 4 each have two input interfaces and one output interface. The output interface is connected to the propeller, and the input interface is connected to two motors, forming a parallel dual-motor structure. The left inverter 9 and right inverter 10 control two motors respectively. The power output of the two parallel motors converges into one reducer, which provides a single-shaft output, enabling the electric ship to... The higher power output, without the need for high-power industrial motors, reduces the power requirements and costs of motors and enables redundant power design, improving the safety and reliability of electric ships. Meanwhile, the left inverter 9 and right inverter 10 each integrate two control modules, each containing a fault detection and judgment unit. This unit can not only receive the detection data from the motor temperature detection device and formulate independent operating strategies for each motor, but also judge the fault status of the temperature detection device, improving the accuracy of control. Combined with the aforementioned design of dual main engines driving dual propellers, this greatly reduces the likelihood of electric ships stopping due to temperature faults and drifting on the water.

[0024] Optionally, it also includes an inverter temperature detection device, which is connected to the left inverter 9 and the right inverter 10. Each control module is connected to an inverter temperature detection device and is used to control the operation strategy of the corresponding motor according to the detection result of the inverter temperature detection device. The fault judgment unit is used to determine whether the inverter temperature detection device is working properly.

[0025] Specifically, for the temperature detection of the electric ship propulsion system, an inverter temperature detection device is also set up. The inverter temperature detection device detects the temperature of the left inverter 9 and the right inverter 10, and inputs its detection results with the detection results of each motor temperature detection device into the control module for comparison and judgment.

[0026] Optionally, the fault detection unit includes a voltage detection unit and / or a resistance detection unit. The voltage detection unit is used to detect the power supply voltage of the motor temperature detection device and the inverter temperature detection device, and the resistance detection unit is used to detect the resistance of the motor temperature detection device and the inverter temperature detection device.

[0027] Specifically, both the motor temperature detection device and the inverter temperature detection device use resistive temperature detection devices, which are powered by the inverter. For fault diagnosis of the motor temperature detection device and the inverter temperature detection device, voltage detection units and / or resistance detection units can be used. By judging whether the power supply voltage of the motor temperature detection device and the inverter temperature detection device is normal and / or judging whether the resistance value of the motor temperature detection device and the inverter temperature detection device is abnormal, such as zero or infinite, it can be determined whether there is an abnormality in the motor temperature detection device and the inverter temperature detection device itself, thereby realizing the fault diagnosis of temperature detection.

[0028] Optionally, the left inverter 9 and the right inverter 10 are each provided with two independent outputs, both of which are dual-motor inverters.

[0029] Specifically, two motors are connected to one inverter, which has two independent outputs, thus becoming a dual-motor inverter. The dual-motor inverter receives instructions from the energy management device to execute the output, and can control two motors separately.

[0030] Optionally, the two motors connected to the left reducer 3 are the first left motor 5 and the second left motor 6, and the two motors connected to the right reducer 4 are the first right motor 7 and the second right motor 8. The first left motor 5 and the second left motor 6 are respectively connected to the two independent outputs of the left inverter 9, and the first right motor 7 and the second right motor 8 are respectively connected to the two independent outputs of the right inverter 10.

[0031] Specifically, the left inverter 9 is connected to the first left motor 5 and the second left motor 6 through its two independent outputs, and the right inverter 10 is connected to the first right motor 7 and the second right motor 8 through its two independent outputs. The four motors do not affect each other.

[0032] Optionally, the motor temperature detection device includes a first left motor temperature detection device, a second left motor temperature detection device, a first right motor temperature detection device, and a second right motor temperature detection device. The inverter temperature detection device includes a left inverter temperature detection device 17 and a right inverter temperature detection device 18. The two control modules integrated in the left inverter 9 are a first left control module 13 and a second left control module 14, respectively. The two control modules integrated in the right inverter 10 are a first right control module 15 and a second right control module 16, respectively. The first left control module 13 is connected to the first left motor temperature detection device and the left inverter temperature detection device 17. The second left control module 14 is connected to the second left motor temperature detection device and the left inverter temperature detection device 17. The first right control module 15 is connected to the first right motor temperature detection device and the right inverter temperature detection device 18. The second right control module 16 is connected to the second right motor temperature detection device and the right inverter temperature detection device 18.

[0033] Specifically, each motor is equipped with a motor temperature detection device, each inverter is equipped with an inverter temperature detection device, and each inverter integrates two control modules. The four control modules provide independent temperature protection control for the four motors, enabling them to operate according to their respective operating strategies. The control modules can compare the detection results of the motor temperature detection devices and inverter temperature detection devices with the corresponding set values, and adjust the operating strategy when overheating occurs.

[0034] Optionally, the operating strategy includes a first power reduction strategy and a second power reduction strategy. The power reduction percentage of the first power reduction strategy is less than that of the second power reduction strategy. The control module can execute the first power reduction strategy when the detection result of the motor temperature detection device is not less than a first set value and not greater than a second set value, and can execute the second power reduction strategy when the detection result of the motor temperature detection device is not less than the second set value.

[0035] Specifically, when the motor and / or inverter overheat, the control module employs a power reduction strategy to control the motor. The operating strategy has two levels: a first power reduction strategy and a second power reduction strategy. The first power reduction strategy reduces power to a lesser extent than the second. For example, when the first power reduction strategy is activated, the motor can only operate at 50%-60% of its rated power, while when the second power reduction strategy is activated, the motor can only operate at 10%-20% of its rated power. When the motor temperature detection device's result is not less than a first set value and not greater than a second set value, for example, when the first power reduction strategy is activated... The first setpoint is 150℃, and the second setpoint is 165℃. When the detection result is between the two values, the first power reduction strategy is executed, and the corresponding motor can only operate at 50%-60% of its rated power. This is to ensure that the motor temperature will not continue to rise under normal cooling conditions. When the detection value of the motor temperature detection device is not less than the second setpoint, for example, if the detection result is greater than 165℃, the second power reduction strategy is executed, and the corresponding motor can only operate at 10%-20% of its rated power. This is to ensure that the motor temperature will not continue to rise under abnormal cooling conditions.

[0036] Furthermore, the control module controls the operation strategy based on the inverter temperature detection device, similar to the operation strategy control based on the motor temperature detection device mentioned above. For the detection result of the inverter temperature detection device, the first set value can be 90℃, and the second set value can be 100℃. If either the detection result of the motor temperature detection device or the inverter temperature detection device reflects an over-temperature situation, the control module will execute the corresponding control program. In other words, the control program takes the detection result of the motor temperature detection device and the inverter temperature detection device that indicates the more severe situation as the standard.

[0037] Optionally, the motor temperature detection device includes a motor bearing temperature sensor and a motor winding temperature sensor.

[0038] Specifically, the motor temperature detection device includes a first left motor front bearing temperature sensor 19, a first left motor rear bearing temperature sensor 20, a second left motor front bearing temperature sensor 21, a second left motor rear bearing temperature sensor 22, a first left motor front winding temperature sensor 23, a first left motor middle winding temperature sensor 24, a first left motor rear winding temperature sensor 25, a second left motor front winding temperature sensor 26, a second left motor middle winding temperature sensor 27, a second left motor rear winding temperature sensor 28, a first right motor front bearing temperature sensor 29, a first right motor rear bearing temperature sensor 30, a second right motor front bearing temperature sensor 31, a second right motor rear bearing temperature sensor 32, a first right motor front winding temperature sensor 33, a first right motor middle winding temperature sensor 34, a first right motor rear winding temperature sensor 35, a second right motor front winding temperature sensor 36, a second right motor middle winding temperature sensor 37, and a second right motor rear winding temperature sensor 38.

[0039] like Figure 3 As shown, the present invention also provides a protection method for an electric ship propulsion system with temperature protection, based on the above-mentioned electric ship propulsion system with temperature protection, comprising: The motor temperature is collected by a motor temperature detection device during normal ship navigation. The fault detection unit determines whether the motor temperature detection device is working properly. If the motor temperature detection device is working normally, the detection result of the motor temperature detection device is input into the control module and compared with the first set value and the second set value in turn. When the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed. After the first power reduction strategy is executed for a set time, the detection result of the motor temperature detection device is input into the control module again and compared with the first set value and the second set value in turn. If the detection result of the motor temperature detection device is less than the first set value, the normal power is restored. If the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed until the shore is reached. When the detection value of the motor temperature detection device is not less than the second set value, the second power reduction strategy is executed until the vehicle reaches the shore.

[0040] Specifically, the detection of over-temperature conditions includes not only the detection of motor over-temperature conditions but also the detection of inverter over-temperature conditions. The detection of inverter over-temperature conditions and the operation strategy control implemented by the control module based on the detection results of the inverter temperature detection device are similar to the aforementioned detection of motor over-temperature conditions and the operation strategy control implemented by the control module based on the detection results of the motor temperature detection device; for example... Figure 3As shown, during normal ship operation, the motor temperature is collected by a motor temperature detection device, and the inverter temperature is collected by an inverter temperature detection device. A fault detection unit determines whether the motor and inverter temperature detection devices are functioning correctly. If both devices are functioning correctly, the detection result of the motor temperature detection device is input into the control module and compared sequentially with its corresponding first and second set values. Similarly, the detection result of the inverter temperature detection device is input into the control module and compared sequentially with its corresponding first and second set values. When the detection result of the motor temperature detection device is not less than its corresponding first set value and not greater than its corresponding second set value, or when the detection result of the inverter temperature detection device is not less than its corresponding first set value and not greater than its corresponding second set value, a first power reduction strategy is executed. After the power reduction strategy is set for a certain period, the detection results of the motor temperature detection device and the inverter temperature detection device are input into the control module again and compared with their corresponding first and second set values ​​in sequence. If the detection result of the motor temperature detection device is less than its corresponding first set value and the detection result of the inverter temperature detection device is less than its corresponding first set value, then normal power is restored. If the detection result of the motor temperature detection device is not less than its set first set value and not greater than its second set value, or the detection result of the inverter temperature detection device is not less than its set first set value and not greater than its second set value, then the first power reduction strategy is executed until the device reaches the shore. When the detection result of the motor temperature detection device is not less than its corresponding second set value, or the detection result of the inverter temperature detection device is not less than its corresponding second set value, then the second power reduction strategy is executed until the device reaches the shore.

[0041] Optionally, it also includes: If the motor temperature detection device malfunctions, a temperature acquisition fault alarm will be triggered, and normal power will be maintained. After triggering a temperature acquisition fault alarm, the fault detection and judgment unit will again determine whether the motor temperature detection device is working properly. If the motor temperature detection device is working properly, the ship will sail normally. If the motor temperature detection device is not working properly, the second power reduction strategy will be implemented until the ship reaches the shore.

[0042] Specifically, when the fault detection and judgment unit determines that the motor temperature detection device or the inverter temperature detection device is not working properly, it issues a temperature acquisition fault alarm, which can be an audible and visual alarm or a pop-up alarm on the display screen. At this time, the ship is kept running at normal power first, and then the motor temperature detection device and the inverter temperature detection device are checked again. If both return to normal temperature detection, the ship can sail normally and the operation strategy can be controlled normally through the control module. If the motor temperature detection device or the inverter temperature detection device is still determined to be not working properly, a second power reduction strategy needs to be implemented until the ship docks for maintenance.

[0043] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An electric marine propulsion system with temperature protection, characterized in that, include: A left propeller and a right propeller are respectively connected to the output ends of a left reducer and a right reducer. The left reducer and the right reducer are respectively connected to two motors. The two motors connected to the left reducer are connected to a first energy management device through a left inverter. The two motors connected to the right reducer are connected to a second energy management device through a right inverter. A motor temperature detection device is provided, which is connected to the motor. The left inverter and the right inverter each integrate two control modules. Each control module is connected to one of the motor temperature detection devices and is used to control the operating strategy of the corresponding motor based on the detection results of the motor temperature detection device. The control module includes a fault detection and judgment unit, which is used to determine whether the motor temperature detection device is working properly.

2. The electric marine propulsion system with temperature protection according to claim 1, characterized in that, It also includes an inverter temperature detection device, which is connected to the left inverter and the right inverter. Each control module is connected to one inverter temperature detection device and is used to control the operating strategy of the corresponding motor according to the detection result of the inverter temperature detection device. The fault judgment unit is used to determine whether the inverter temperature detection device is working properly.

3. The electric ship propulsion system with temperature protection according to claim 2, characterized in that, The fault detection and judgment unit includes a voltage detection unit and / or a resistance detection unit. The voltage detection unit is used to detect the power supply voltage of the motor temperature detection device and the inverter temperature detection device, and the resistance detection unit is used to detect the resistance of the motor temperature detection device and the inverter temperature detection device.

4. The electric ship propulsion system with temperature protection according to claim 2, characterized in that, The left inverter and the right inverter are each equipped with two independent outputs, and both are dual-motor inverters.

5. The electric marine propulsion system with temperature protection according to claim 4, characterized in that, The two motors connected to the left reducer are the first left motor and the second left motor, and the two motors connected to the right reducer are the first right motor and the second right motor. The first left motor and the second left motor are respectively connected to the two independent outputs of the left inverter, and the first right motor and the second right motor are respectively connected to the two independent outputs of the right inverter.

6. The electric marine propulsion system with temperature protection according to claim 5, characterized in that, The motor temperature detection device includes a first left motor temperature detection device, a second left motor temperature detection device, a first right motor temperature detection device, and a second right motor temperature detection device. The inverter temperature detection device includes a left inverter temperature detection device and a right inverter temperature detection device. Two control modules integrated in the left inverter are a first left control module and a second left control module, respectively. Two control modules integrated in the right inverter are a first right control module and a second right control module, respectively. The first left control module is connected to the first left motor temperature detection device and the left inverter temperature detection device. The second left control module is connected to the second left motor temperature detection device and the left inverter temperature detection device. The first right control module is connected to the first right motor temperature detection device and the right inverter temperature detection device. The second right control module is connected to the second right motor temperature detection device and the right inverter temperature detection device.

7. The electric marine propulsion system with temperature protection according to claim 1, characterized in that, The operating strategy includes a first power reduction strategy and a second power reduction strategy. The power reduction percentage of the first power reduction strategy is less than that of the second power reduction strategy. The control module can execute the first power reduction strategy when the detection result of the motor temperature detection device is not less than a first set value and not greater than a second set value, and can execute the second power reduction strategy when the detection result of the motor temperature detection device is not less than the second set value.

8. The electric marine propulsion system with temperature protection according to claim 1, characterized in that, The motor temperature detection device includes a motor bearing temperature sensor and a motor winding temperature sensor.

9. A protection method for an electric ship propulsion system with temperature protection, based on the electric ship propulsion system with temperature protection as described in any one of claims 1-8, characterized in that, include: The motor temperature is collected by a motor temperature detection device during normal ship operation; The fault detection unit determines whether the motor temperature detection device is working properly. If the motor temperature detection device is working normally, the detection result of the motor temperature detection device is input into the control module and compared with the first set value and the second set value in turn. When the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed. After the first power reduction strategy is executed for a set time, the detection result of the motor temperature detection device is input into the control module again and compared with the first set value and the second set value in turn. If the detection result of the motor temperature detection device is less than the first set value, the normal power is restored. If the detection result of the motor temperature detection device is not less than the first set value and not greater than the second set value, the first power reduction strategy is executed until the shore is reached. When the detection structure of the motor temperature detection device is not less than the second set value, the second power reduction strategy is executed until the vehicle reaches the shore.

10. The protection method for an electric ship propulsion system with temperature protection according to claim 9, characterized in that, Also includes: If the motor temperature detection device malfunctions, a temperature acquisition fault alarm will be triggered, and normal power will be maintained. After triggering a temperature acquisition fault alarm, the fault detection and judgment unit will again determine whether the motor temperature detection device is working properly. If the motor temperature detection device is working properly, the ship will sail normally. If the motor temperature detection device is not working properly, the second power reduction strategy will be implemented until the ship reaches the shore.

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