Submersible Power Generator with Nested Armatures
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Solution Overview
Problem
Conventional submersible power generators face instability in water due to independent rotational torques and require size-increasing gear mechanisms for high electromotive voltage, leading to increased size and potential cavitation issues.
Innovation Solution
A submersible power generator design featuring coaxially disposed propellers with twisted blades, an inner/outer double rotational armatures-type mechanism, and a casing that stabilizes the rotational moment center, allowing equal reciprocal rotational torques and increased rotation speed without additional size, while being moored with mooring wires connected around the rotational moment center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a speed increasing gear or pulley mechanism is provided to increase the rotation speed of propellers for generating high electromotive voltage, then the electromotive voltage and electrical efficiency are improved, but the size of the power generator increases
Solution Approach 1:
The patent employs nested armatures where an inner rotational armature is positioned inside an outer rotational armature. Both armatures rotate in opposite directions and both contribute to power generation simultaneously. This nested configuration allows the system to generate high electromotive voltage through the combined effect of multiple armatures without requiring speed-increasing gear mechanisms, thereby avoiding an increase in the overall size of the power generator.
Solution Approach 2:
The patent merges the power generation functions of multiple armatures (inner and outer) into a single integrated system. Both armatures are driven by propellers and work together to generate electricity, combining their contributions to achieve high electromotive voltage and electrical efficiency without the need for additional speed-increasing components that would increase the device size.
2Power
If the rotation speed of propellers is increased to generate high electromotive voltage, then the power generation efficiency is improved, but propeller cavitation occurs
Solution Approach 1:
The nested dual armature configuration allows the system to achieve high electromotive voltage through multiple armatures rotating in opposite directions, each driven by propellers at moderate speeds. This eliminates the need to over-speed individual propellers, thereby preventing cavitation while maintaining high power generation efficiency.
Solution Approach 2:
The patent changes the operational parameters by using multiple armatures rotating at moderate speeds rather than a single armature requiring high rotation speed. This parameter change allows the propellers to operate below cavitation thresholds while still achieving high electromotive voltage through the combined effect of multiple armatures cutting magnetic fields.
3Device complexity
If the front outer rotational armature and rear outer rotational armature are driven independently by separate propellers, then the power generation mechanism is simpler, but the rotational torques are independent and the power generator cannot be stably moored in water
Solution Approach 1:
The patent merges the rotational systems by connecting the front and rear propellers through a common drive shaft, causing them to rotate in opposite directions simultaneously. This integration ensures that the rotational torques generated by the front and rear outer rotational armatures are kinetically and electromagnetically coupled, producing equal and opposite torques that cancel each other out, thereby achieving stable mooring without increasing device complexity.
Solution Approach 2:
The patent introduces asymmetry in the rotational directions of the propellers and armatures. The front and rear propellers rotate in opposite directions, as do the inner and outer armatures. This asymmetric rotation pattern creates balanced counteracting torques that stabilize the power generator in water while maintaining a relatively simple power generation mechanism.
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 design enables stable water mooring, higher electromotive voltage, and reduced size without increasing size, preventing cavitation by optimizing propeller speed and torque balance, and maintaining stability across varying water currents.
Implementation Method 1
The electromotive voltage level of the power generation mechanism is proportional to the speed at which the rotational armature cuts a magnetic field.
Implementation Method 2
installed under water to operate in a water current
Implementation Method 3
buoyancy F acting on the submersible power generator is larger than gravity W acting on the submersible power generator during operation
Implementation Method 4
gravity W acting on the submersible power generator
Data Source
AI summary
A submersible power generator with an inner/outer double rotational armatures-type power generation mechanism provided with an outer rotational armature and an opposing inner rotational armature to rotate opposite to the outer rotational armature, and a pair of propellers, where one of the propellers is connected to one of the inner and outer rotational armatures and the other of the propellers is connected to the other armatures, and a casing for accommodating the inner/outer double rotational armatures-type power generation mechanism and shielding it from an external environment. The submersible power generator is installed under water to operate in a water current with a gravity W that is larger than buoyancy F acting thereon during operation of the submersible power generator, and makes a rotational moment center that a sum total of rotational moments generated by gravity W, buoyancy F, and drag D in a water current becomes zero.