Multi-DoF Electromagnetic Machine Amplitude Modulation Control
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Solution Overview
Problem
Current multi-degree of freedom motion control systems are inefficient and cumbersome due to the need for multiple motors or actuators, making them unsuitable for smaller platforms like mini- or micro-UAVs and micro-satellites, and existing solutions like the Global Pointing Actuator cannot achieve three degrees of freedom.
Innovation Solution
A multi-degree-of-freedom electromagnetic machine with a stator having three stator conductors following different trajectories, forming a surface, and an armature with magnets, where direct current is supplied and amplitude modulated to achieve electromagnetic coupling, allowing for movement in three degrees of freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple motors or actuators are used for each degree of freedom, then the motion control system can achieve multi-DoF movement, but the system becomes large and cumbersome
Solution Approach 1:
The patent merges multiple actuator functions into a single electromagnetic machine with a spherical stator containing multiple conductors arranged along different trajectories. This single device can produce multi-degree of freedom motion by independently controlling current in each conductor, eliminating the need for multiple separate motors and reducing overall system complexity
Solution Approach 2:
The electromagnetic machine is designed with universal functionality to handle multiple degrees of freedom simultaneously. The spherical stator with conductors along different trajectories can generate forces in multiple directions, allowing one device to perform the work of multiple specialized actuators
2Adaptability or versatility
If a spherical stator with latitude and longitude coils is used, then two degrees of freedom movement is achieved, but three degrees of freedom movement cannot be achieved
Solution Approach 1:
The patent extends the conventional two-coil spherical actuator by adding a third conductor trajectory dimension. While traditional actuators use latitude and longitude coils for two degrees of freedom, this invention adds conductors along a third independent trajectory, enabling control in three degrees of freedom through spatial dimensionality expansion
Solution Approach 2:
The stator is segmented into multiple independent conductor windings, each contributing to a specific degree of freedom. By dividing the electromagnetic generation into separate conductor segments with distinct trajectories, the system can independently control each degree of freedom while maintaining a compact spherical 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
The solution enables a smaller, more efficient, and less cumbersome motion control system capable of three-degree freedom movement, addressing the inefficiencies of existing systems and expanding their applicability to smaller platforms.
Implementation Method 1
selectively amplitude modulate the DC supplied to one or more of the first, second, and third stator conductors, to thereby electromagnetically couple the armature conductor to the one or more first, second, and third stator conductors
Implementation Method 2
The armature includes an armature conductor and a plurality of magnets, where each magnet has at least one of its magnetic poles facing the surface
Data Source
AI summary
A multi-degree-of-freedom electromagnetic machine includes a stator, an armature, and a control. The stator includes a first stator conductor, a second stator conductor, and a third stator conductor. The armature is disposed adjacent to, and is movable relative to, the stator. The armature includes an armature conductor and a plurality of magnets, where each magnet has at least one of its magnetic poles facing the surface. The control is coupled to the first, second, and third stator conductors, and is configured to supply direct current (DC) to the first, second, and third stator conductors, and to selectively amplitude modulate the DC supplied to one or more of the first, second, and third stator conductors, to thereby electromagnetically couple the armature conductor to the one or more first, second, and third stator conductors.