Contra-Rotating Flywheel Torque Compensation in Medical Rotors
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Solution Overview
Problem
Current medical apparatus with rotating components, such as radiotherapy and imaging systems, face challenges in increasing rotational speed due to significant torque reaction forces, which can lead to slippage and increased energy requirements, making it difficult to reduce treatment time and maintain safety.
Innovation Solution
The implementation of a contra-rotating flywheel driven coaxially with the rotary element of the medical apparatus, allowing the flywheel to rotate freely and be accelerated/decelerated by means fixed to the rotary element, reduces external torque reaction forces by developing torque in opposite directions, enabling higher rotational speeds and minimizing skidding and lateral loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the drum is increased to reduce treatment time, then productivity is improved, but torque reaction forces increase causing slippage and requiring multiple drive wheels
Solution Approach 1:
A contra-rotating flywheel is introduced that rotates in the opposite direction to the drum, creating counterbalancing torque reaction forces. The flywheel's rotation generates equal and opposite reactive forces that cancel out the torque reactions from the drum's acceleration and deceleration, enabling higher rotational speeds without excessive lateral loads on the base structure.
Solution Approach 2:
The system changes the rotational parameters by introducing a second rotating element (flywheel) with opposite rotation direction. This parameter change transforms the single-source torque reaction problem into a balanced system where the net external torque reaction is significantly reduced, allowing the drum to rotate faster without proportionally increasing lateral loads.
2Productivity
If the rotational speed is increased to reduce treatment time, then productivity is improved, but the risk of slippage between drum and wheels increases
Solution Approach 1:
The contra-rotating flywheel provides counterbalancing forces that reduce the net torque reaction at the drum-wheel interface. By canceling out the reactive forces during acceleration and deceleration, the system maintains better traction between the drum and support wheels, reducing slippage risk even at higher rotational speeds.
3Productivity
If the rotational speed is increased, then treatment time is reduced, but lateral loads on the base supporting structure increase
Solution Approach 1:
The flywheel's opposite rotation creates counterbalancing forces that significantly reduce the lateral loads transmitted to the base supporting structure. During drum acceleration and deceleration, the flywheel generates equal and opposite reactive forces, canceling out the lateral load components that would otherwise be imposed on the base structure at higher rotational speeds.
4Reliability
If braking torque is applied to stop the drum quickly for safety, then health and safety is improved, but the reaction forces on the apparatus increase
Solution Approach 1:
During emergency braking, the contra-rotating flywheel continues to rotate in the opposite direction, providing counterbalancing forces that reduce the net reaction forces on the apparatus. The flywheel's inertial response during deceleration cancels out portions of the braking reaction forces, allowing quicker stops with reduced stress on the supporting structure.
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 solution allows for a significant reduction in treatment time by enabling the rotary element to rotate at least three times faster while reducing torque reaction forces, minimizing the need for multiple drive wheels and lateral loads, thus enhancing operational efficiency and safety.
Implementation Method 1
a torque will develop between the rotary element and the contra-rotating flywheel, which will accelerate both in opposite directions
Implementation Method 2
The flywheel may be driven at a higher angular velocity than the rotary element, with their respective moments of inertia being matched as appropriate
Data Source
AI summary
A system and method for compensating for torque reaction forces in a medical apparatus is disclosed. The system may include a rotary element which rotates about an axis. A contra-rotating flywheel may be driven to rotate about the axis relative to the rotary element, wherein the flywheel is free to rotate and is accelerated and decelerated by a driver which is fixed to the rotary element. Contra-rotation of the flywheel may compensate for torque reaction forces when the rotary element is accelerated or decelerated.