Dual-Motor Propeller Drive Control for Output Load Balancing
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Solution Overview
Problem
In electric flight vehicles with multiple motors driving a propeller, variations in motor outputs can lead to increased electrical and thermal loads on individual motors, potentially causing imbalance and reducing efficiency.
Innovation Solution
A drive device comprising a first and second motor, an output shaft connecting the rotor to both motors, and a motor controller that ensures the outputs of both motors are equal, thereby minimizing load imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple motors are used to drive a propeller, then the power output and driving capability are improved, but the load imbalance and thermal effects on individual motors increase
Solution Approach 1:
The control device continuously monitors the rotation speeds of multiple motors and adjusts their operation based on feedback signals. When one motor rotates slower than others, the control device reduces its drive force to prevent excessive load and thermal effects, while allowing faster motors to compensate and maintain overall propeller rotation.
Solution Approach 2:
The system dynamically adjusts the drive force of each motor based on real-time rotation speed differences. The control device modifies motor operation parameters adaptively, allowing the system to respond to changing conditions and maintain balance among motors during operation.
2Reliability
If motor outputs are not equalized, then individual motors experience higher electrical and thermal loads, but the system complexity increases if output equalization control is implemented
Solution Approach 1:
The control device uses feedback from rotation speed sensors to automatically adjust motor drive forces, equalizing outputs without requiring complex manual intervention or sophisticated control algorithms.
Solution Approach 2:
The system self-regulates motor outputs by detecting rotation speed differences and automatically adjusting individual motor drive forces, eliminating the need for external monitoring or complex control systems.
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 configuration prevents output differences between motors, reducing electrical and thermal loads, and optimizing the performance and thermal design of the drive system.
Implementation Method 1
a first motor and a second motor that are different from each other and that are driven by energization
Data Source
AI summary
An EPU includes a first DS and a second DS. The first DS includes a first motor and a first inverter control unit. The second DS includes a second motor and a second inverter control unit. The first motor and the second motor are connected to a propeller via an EPU shaft. The EPU shaft drives and rotates a propeller according to outputs of the motor. The first inverter control unit controls the first motor so that the output of the first motor and the output of the second motor become a same. The second inverter control unit controls the second motor so that the output of the first motor and the output of the second motor become same as each other.