eVTOL Motor Current Phase Control for Torque-Efficient Propulsion
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Solution Overview
Problem
Existing propulsion systems in electric aircraft do not efficiently increase motor efficiency during abnormal conditions, leading to suboptimal energy usage.
Innovation Solution
A propulsion device and control system that adjusts the current phase of the motor current based on the state of the moving object, allowing for increased motor torque without increasing the magnitude of the motor current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is controlled by another motor control system when an abnormality occurs, then the motor can continue to operate without driving stop, but the efficiency of the motor is not increased
Solution Approach 1:
The patent changes the parameter of current phase angle in addition to current magnitude. By adjusting both the magnitude and phase angle of the motor current based on motor state information, the system optimizes motor efficiency while maintaining continuous operation during abnormal conditions. This resolves the contradiction by enabling efficiency improvement without sacrificing reliability.
2Force
If the magnitude of motor current is increased to increase motor torque, then the motor torque increases, but the energy consumption increases
Solution Approach 1:
The patent introduces phase angle adjustment as an additional parameter alongside current magnitude. By optimizing both parameters based on motor state, the system achieves higher motor torque with lower energy consumption. This resolves the contradiction by providing a two-degree-of-freedom control approach that decouples torque production from proportional energy increase.
Solution Approach 2:
The patent recovers wasted energy by adjusting the current phase angle to match the optimal angle for motor operation. By discarding suboptimal current phasing and replacing it with optimized phasing based on motor state, the system achieves better torque efficiency and reduces unnecessary energy consumption.
3Use of energy by moving object
If the current phase is adjusted according to motor state, then the motor efficiency increases, but the control system complexity increases
Solution Approach 1:
The patent implements feedback control by acquiring motor state information and using it to adjust both current magnitude and phase angle. This feedback mechanism enables dynamic optimization of motor efficiency while managing control complexity through systematic state-based adjustment rather than complex algorithms.
Solution Approach 2:
The patent introduces motor state information as an intermediary that bridges the control system and motor operation. By using this intermediary to guide both current magnitude and phase angle adjustments, the system achieves efficient motor control without requiring direct complex interaction between all control parameters.
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
This approach enhances motor efficiency, resulting in energy savings by optimizing torque production.
Implementation Method 1
a motor (MOT) configured to be driven to propel the moving object
Data Source
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AI summary
A propulsion device (15) includes a motor device (60) and an inverter device (80). The motor device (60) includes a motor (61). The inverter device (80) includes an inverter control unit (81) and an inverter circuit (85). The inverter control unit (81) controls the motor (61) via the inverter circuit (85). The inverter control unit (81) adjusts a current phase of a current vector according to a state of an eVTOL (10). The inverter control unit (81) is capable of adjusting the current phase according to a command torque. The inverter control unit (81) is capable of adjusting the current phase according to an abnormal state of the eVTOL (10). The inverter control unit (81) is capable of adjusting the current phase according to a flight state of the eVTOL (10).