Aircraft Nose Wheel Motor Torque Control via Differential Steering
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Solution Overview
Problem
Aircraft nose wheel motors face challenges in providing sufficient torque for direct drive, leading to inefficient motor utilization, excessive weight, and poor efficiency, especially during takeoff and landing when gearing systems can cause motor over-speeding.
Innovation Solution
The implementation of independently driven motors within each nose wheel, equipped with speed and torque sensors, which collect data and transmit it to a central processing unit for guidance, enabling precise control and differential steering to manage torque and speed differentials for safe and efficient taxi operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a motor is sized to produce the torque necessary for direct drive of the aircraft wheel, then the required torque is achieved, but the motor operates at well below maximum speed and power levels, resulting in excessive weight and poor efficiency
Solution Approach 1:
A gearing system is introduced as an intermediary between the motor and the aircraft wheel. The gear system includes a pinion gear connected to the motor shaft and a ring gear connected to the wheel, creating a mechanical advantage that allows a smaller, more efficient motor to produce the required torque at the wheel while operating within its optimal speed and power range.
2Loss of energy
If gearing is used to provide a higher speed, lower torque motor with a higher torque option, then motor size and efficiency are improved, but the motor may be forced to spin at much higher speeds than rated during takeoff and landing when wheels rotate faster than the motor
Solution Approach 1:
The system dynamically adapts the gear ratio based on operating conditions. During normal operation, the gearing provides mechanical advantage for torque multiplication. During high-speed conditions such as takeoff and landing, the system can disengage or bypass the gearing to allow the motor to spin at higher speeds without damage, thus protecting the motor while maintaining efficiency during normal operation.
3Measurement precision
If speed and torque sensors are added to the nose wheel motor for precise control, then guidance precision and stability are enhanced, but device complexity increases
Solution Approach 1:
Speed and torque sensors are installed on the nose wheel motor to provide real-time feedback to the control system. The speed sensor monitors rotational velocity while the torque sensor measures output force. This feedback enables the control system to precisely regulate motor operation, maintain optimal performance, and prevent conditions such as wheel slip or excessive torque that could damage the aircraft or sensors.
Data Source
AI summary
The present invention describes a drive system for an aircraft involving one or more nose wheel motors. Data regarding the nose wheel rotation is used to control the ground travel of the aircraft, to predict potential problems, to provide more precise control over the aircraft, and to improve aircraft safety.