Rotor Blade Pitch Control for Battery Overcharge Suppression
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Solution Overview
Problem
Flying objects with generators and batteries face challenges in managing excess electric power to prevent battery deterioration while maintaining flight states, as existing technologies do not effectively consume surplus energy during flight.
Innovation Solution
A control device with a power unit, electric motor, rotor blade, battery status determination part, and variable pitch mechanism, where the pitch of the rotor blade is adjusted based on battery charging rate to increase electric motor load and consume excess power, thereby preventing overcharge and optimizing energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess electric power is consumed by operating a mechanism of a part of the entire system, then battery overcharge is suppressed, but flight state cannot be maintained
Solution Approach 1:
The rotor blade pitch is dynamically adjusted based on battery charging rate. When the charging rate exceeds a threshold, the pitch angle is increased to increase electric motor load and consume excess power, while maintaining flight capability. This dynamic adjustment resolves the contradiction by making the system adaptable to real-time power conditions.
2Loss of energy
If the pitch of the rotor blade is changed to increase electric motor load, then excess electric power is consumed, but battery deterioration is suppressed
Solution Approach 1:
The control device continuously monitors the battery charging rate and provides feedback to adjust the rotor blade pitch accordingly. When charging rate exceeds the threshold, pitch is increased to consume excess power; when charging rate is below the threshold, pitch is reduced to allow battery charging. This closed-loop feedback mechanism optimizes energy utilization and suppresses battery deterioration.
3Use of energy by moving object
If the pitch of the rotor blade is changed to reduce electric motor load, then generated electric power can be charged to the battery, but fuel efficiency deteriorates
Solution Approach 1:
The system changes the operational parameters (pitch angle) based on battery state of charge and charging rate. By adjusting the pitch angle, the system optimizes the balance between consuming generated power for flight and charging the battery, thereby improving overall energy efficiency and reducing fuel consumption without compromising flight performance.
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 effectively consumes excess electric power, reducing battery deterioration and maintaining flight states by dynamically adjusting the rotor blade pitch according to battery charging rates, while also reducing fuel inefficiency by distributing generated power to the battery when needed.
Implementation Method 1
a generator 11, a driving source 12 configured to drive the generator 11
Implementation Method 2
an electric motor 3 driven by electric power supplied from at least one of the generator 11 and the battery 13
Data Source
AI summary
A control device (1) of a flying object includes a generator (11), a driving source (12), a battery (13), an electric motor (3), a rotor blade (4), a battery status determination part (5), a variable pitch mechanism (6), and a pitch change control part (7). The electric motor (3) is driven by electric power supplied from at least one of the generator (11) and the battery (13). The rotor blade (4) is driven by the electric motor (3). The battery status determination part (5) determines a state of charge of the battery (13). The variable pitch mechanism (6) changes a pitch of the rotor blade (4). The pitch change control part (7) determines whether the pitch of the rotor blade (4) is changed based on a charging rate of the battery determined by the battery status determination part (5).