Rotating Magnetic Field Actuation for MSM Devices
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Solution Overview
Problem
Existing MSM actuation devices with permanent magnets are heavy and bulky, while those using multiple linearly placed electrical coils are complex and costly, often requiring additional cooling, which increases weight and complexity.
Innovation Solution
A system utilizing two electromagnetic coils positioned at specific angles relative to each other, powered with alternating current signals having a 90° phase difference, to create a rotating magnetic field that actuates an MSM element, reducing the need for rotating magnets and linear coil configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If permanent magnets are used for actuation, then magnetic field generation is achieved, but the device becomes heavy and bulky
Solution Approach 1:
The patent replaces permanent magnets (mechanical/magnetic system) with electromagnetic coils that generate magnetic fields through electrical current. This substitution eliminates the need for heavy permanent magnets while maintaining the magnetic field generation capability required for MSM actuation.
Solution Approach 2:
The patent changes the method of magnetic field generation from static permanent magnets to dynamic electromagnetic fields controlled by AC current parameters. By adjusting current amplitude and phase, the magnetic field characteristics can be optimized to achieve actuation without the weight penalty of permanent magnets.
2Reliability
If multiple linearly placed electrical coils are used, then magnetic field actuation is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple coil functions into a single planar coil structure that generates both X and Y directional magnetic field components simultaneously. This consolidation reduces the number of separate coils and controllers needed, thereby simplifying device complexity while maintaining full actuation capability.
Solution Approach 2:
The patent transitions from a linear arrangement of coils to a planar configuration where a single coil generates magnetic field components in multiple directions through spatial orientation and phase-controlled current. This dimensional change allows one coil to perform the work of multiple linearly arranged coils.
3Power
If multiple electrical coils are used to produce magnetic field, then actuation is achieved, but additional cooling devices are required which add weight and circuitry
Solution Approach 1:
The patent designs the planar coil structure to operate within thermal limits without requiring external cooling devices. The reduced power requirements and efficient heat dissipation through the planar configuration allow the system to self-regulate temperature, eliminating the need for separate cooling systems and their associated weight and complexity.
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 simplifies the actuation system, reduces electrical power requirements, eliminates the need for active cooling, and decreases the number of components, resulting in a lighter, less complex, and more efficient MSM actuation device.
Implementation Method 1
two electromagnetic coils positioned at specific angles relative to each other, powered with alternating current signals having a 90° phase difference, to create a rotating magnetic field that actuates an MSM element
Data Source
AI summary
A system may include a magnetic shape memory (MSM) element having a long axis that extends from a first end of the MSM element to a second end of the MSM element. The system may further include a first solenoid, where a longitudinal axis of the first solenoid is positioned at a first angle relative to the long axis of the MSM element. The system may also include a second solenoid, where a longitudinal axis of the second solenoid is positioned at a second angle relative to the long axis of the MSM element and at a third angle relative to the longitudinal axis of the first solenoid, where the longitudinal axis of the first solenoid and the longitudinal axis of the second solenoid are not parallel.