Marine Propulsion Power Generator Segmented Coil Groups
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Solution Overview
Problem
Conventional marine propulsion devices require larger power generators to supply bulk electric power, especially when the capacity of the battery increases, leading to a need for a solution that enhances electric power supply without increasing the size of the power generator.
Innovation Solution
A marine propulsion device with an engine, power generator, rectifier, converting device, and transformation mechanism, where the second coil group outputs more electric power than the first, using a switching element and voltage transformation to supply bulk electric power to a second battery, regardless of engine rotations, with windings and stator configurations optimized for increased efficiency and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity of the battery is increased to supply bulk electric power, then the amount of electric power supply is improved, but the size of the power generator must be increased
Solution Approach 1:
The power generator is segmented into two independent coil groups (first coil group and second coil group) with different winding configurations. The first coil group has windings with smaller cross-sectional areas optimized for high-speed operation, while the second coil group has windings with larger cross-sectional areas optimized for low-speed operation. This segmentation allows each coil group to contribute differently based on engine rotation speed, enabling bulk power supply without increasing overall generator size.
Solution Approach 2:
The patent implements dynamic control through a converting device with switching elements that selectively connects the first or second coil group to the battery based on engine rotation speed. At low rotation speeds, the second coil group with larger windings is activated to provide sufficient torque and power. At high rotation speeds, the first coil group with smaller windings is activated. This dynamic switching allows the system to optimize power output across different operating conditions without requiring a larger generator.
2Use of energy by moving object
If the number of rotations of the engine is low, then fuel consumption is reduced, but the output of the power generator decreases
Solution Approach 1:
The converting device dynamically switches between the first and second coil groups based on engine rotation speed. When the engine operates at low rotation speeds to reduce fuel consumption, the second coil group with larger cross-sectional area windings is activated. The larger windings provide lower electrical resistance and higher current output at low speeds, ensuring sufficient power generation even when the engine is not running at high RPM.
Solution Approach 2:
The patent changes the electrical parameters of the power generator by using two coil groups with different winding characteristics. The second coil group is specifically designed with larger cross-sectional area windings that have lower resistance and higher current-carrying capacity at low rotation speeds. This parameter change allows the system to maintain adequate power output while operating the engine at fuel-efficient low rotation speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for a significant increase in electric power supply to the second battery while maintaining or reducing the size of the power generator, ensuring stable power delivery even at low engine rotations and preventing excessive size increases, thus addressing the need for enhanced power supply without enlarging the generator.
Implementation Method 1
a power generator including a rotor rotated following rotation of the crankshaft and a stator arranged to face the rotor
Implementation Method 2
a rectifier configured to rectify alternating-current power generated in the first coil group and to output the rectified alternating-current power to a first battery
Implementation Method 3
a converting device including a switching element, configured to convert alternating-current power generated in the second coil group into direct-current power
Implementation Method 4
a transformation mechanism configured to transform the voltage of the direct-current power into which the converting device converts the alternating-current power and to output the direct-current power, the voltage of which is transformed, to a second battery
Data Source
AI summary
A marine propulsion device, including an engine including a crankshaft, and a power generator including a rotor configured to be rotated by the crankshaft, and a stator arranged to face the rotor, the stator including a first coil group and a second coil group each configured to generate alternating current (AC), the second coil group being configured to generate more electric power than the first coil group. The marine propulsion device further includes a rectifier configured to rectify the AC generated by the first coil group to thereby obtain a first direct current (DC), and to output the first DC to a first battery, a converting device configured to convert the AC generated by the second coil group into a second DC, and a transformation device configured to transform a voltage of the second DC, and to output the voltage-transformed DC to a second battery.