Magnetic Reaction Wheel Coil Switching for Low-Vibration Attitude Control
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Solution Overview
Problem
Conventional mechanical reaction wheels are expensive, require high tolerance and concentricity, and suffer from wear and vibration issues that affect their operating stability and accuracy, leading to potential failure.
Innovation Solution
A magnetic reaction wheel design that utilizes a tube body, movable objects, coils, and object sensors, where coils generate magnetic fields to drive movable objects within the tube, controlled by a processor that turns coils on and off based on sensor feedback to maintain efficient movement and generate angular momentum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mechanical reaction wheel is used, then angular momentum can be generated for attitude control, but the axle and bearing wear causes vibration and reduces operating stability
Solution Approach 1:
The patent replaces the mechanical reaction wheel system (axle, bearing, flywheel) with a magnetic field-based system. Coils generate magnetic fields that interact with movable objects (such as magnets) to produce force without mechanical contact, thereby eliminating wear and vibration while maintaining angular momentum generation capability for attitude control
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the control system and the movable objects. The coils generate magnetic fields that mediate the interaction, allowing force transmission without direct mechanical contact between moving parts, thus eliminating friction and wear associated with traditional mechanical systems
2Manufacturing precision
If a conventional mechanical reaction wheel is used, then attitude control can be achieved, but high tolerance and concentricity requirements increase manufacturing cost
Solution Approach 1:
The patent eliminates the need for high-precision mechanical components like axles and bearings by using magnetic field interactions. The coils and movable objects can be manufactured with standard tolerances since magnetic fields provide the necessary force transmission without requiring precise mechanical alignment or concentricity
Solution Approach 2:
The patent changes the fundamental interaction mechanism from mechanical contact to magnetic field interaction. This parameter change allows the system to function with relaxed manufacturing tolerances, as the magnetic field strength and distribution can be adjusted to compensate for variations in component positioning and dimensions
3Reliability
If a magnetic reaction wheel without axle is used, then wear and vibration are reduced, but the system complexity increases with coils and sensors
Solution Approach 1:
The patent divides the magnetic reaction wheel system into discrete functional segments: coils for magnetic field generation, movable objects for force interaction, and sensors for position detection. This segmentation allows each component to be optimized independently and simplifies the overall control strategy by enabling sequential activation of specific coil segments
Solution Approach 2:
The patent incorporates sensors that detect the position of movable objects and provide feedback to the control system. This feedback mechanism enables real-time adjustment of coil activation patterns, ensuring precise control of the movable objects and maintaining system stability despite the more complex magnetic field-based architecture
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 magnetic reaction wheel operates efficiently without an axle, reducing wear and vibration, thereby enhancing stability and accuracy of attitude control in spacecraft.
Implementation Method 1
A magnetic reaction wheel design that utilizes a tube body, movable objects, coils, and object sensors, where coils generate magnetic fields to drive movable objects within the tube
Data Source
AI summary
A magnetic reaction wheel operating method includes a sensing step, a judging step, and a switching step. In the sensing step, a plurality of object sensors of a magnetic reaction wheel sense at least one movable object. In the judging step, a processor determines whether a sensing signal strength value of a detecting one of the object sensors which is near a powered one of a plurality of coils satisfies a predefined condition. In the switching step, the processor turns off a current of the powered one of the coils, and then turns on a following one of the coils in a moving direction of the at least one movable object so as to allow the at least one movable object to move along the moving direction.