Multi-DOF Electromechanical Actuator with Single Proof-Mass
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Solution Overview
Problem
Existing electromechanical actuators used in applications like aerospace and marine are bulky and have low force density due to the need for multiple actuators and proof-masses to achieve multiple degrees of freedom, which increases complexity and manufacturing costs.
Innovation Solution
A compact actuator design featuring a single proof-mass that can move in multiple degrees of freedom, including translational and rotational movements, using a combination of coils and magnets to generate forces, allowing for independent control of magnetic forces tangential and normal to the surface, and employing a control system to manage current flow for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single degree of freedom actuators are used to produce motion in multiple degrees of freedom, then the required force and motion control capability is achieved, but the actuator system becomes bulky and has low force density
Solution Approach 1:
The patent combines multiple degree of freedom actuators into a single integrated actuator unit. The actuator includes a proof mass mounted for movement in multiple degrees of freedom (at least two, including one translational degree of freedom) and multiple coils arranged to produce forces in different directions. This merging eliminates the need for separate actuators for each degree of freedom, reducing overall system volume while maintaining full motion control capability.
Solution Approach 2:
The single actuator is designed to perform multiple functions simultaneously - it can generate motion in multiple degrees of freedom using a shared proof mass and coil assembly. The coils are arranged and controlled to independently actuate the proof mass in different directions, allowing one actuator unit to replace what would traditionally require multiple specialized actuators.
2Object-affected harmful factors
If multiple actuators with multiple proof-masses are used for active vibration control in multiple degrees of freedom, then vibration reduction capability is achieved, but the system becomes bulky and has low force density
Solution Approach 1:
The patent merges multiple vibration control functions into a single actuator with one proof mass. The proof mass is mounted to move in multiple degrees of freedom and interacts with multiple coils that can be independently controlled. This single proof mass can generate counteracting forces in multiple directions simultaneously, eliminating the need for multiple separate proof masses while maintaining comprehensive vibration control capability.
Solution Approach 2:
The single proof mass serves multiple vibration control functions by being capable of movement in multiple degrees of freedom. Through coordinated control of the multiple coils, the same proof mass can counteract vibrations occurring in different directions and frequencies, making it a universal vibration control element that replaces what would traditionally require multiple specialized proof masses.
3Adaptability or versatility
If multiple actuators are used to achieve multiple degrees of freedom motion, then motion control capability is achieved, but system complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple actuator systems into a single integrated unit with shared components. The actuator includes a common proof mass, shared mounting structure, and coordinated coil assembly that work together to produce motion in multiple degrees of freedom. This integration reduces the number of separate components, simplifies the overall system architecture, and reduces manufacturing complexity while maintaining full multi-axis motion control capability.
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 design results in more compact and high-force-density actuators capable of efficient active vibration control, reducing the effects of vibrations in multiple degrees of freedom while minimizing space and manufacturing costs.
Implementation Method 1
at least two coils arranged such that current flowing through the coils produces a force that acts on the proof-mass
Data Source
AI summary
The present invention concerns electromechanical actuators. More particularly, but not exclusively, this invention concerns actuators operable in multiple degrees of freedom.There is provided an actuator comprising a proof-mass and at least two coils arranged such that current flowing through the coil produces a force that acts on the proof-mass, the proof-mass being mounted for movement in at least two degrees of freedom, wherein one of the at least two degrees of freedom is a translational degree of freedom.