MAGNETIC SHAPE MEMORY TECHNOLOGY: BRIEFLY EXPLAINED

 

Magnetic Shape Memory (MSM) alloys are ferromagnetic materials that produce motion and force under moderate magnetic fields. They are typically single crystalline alloys of Nickel, Manganese and Gallium, and are able to produce 6% strain under up to 2 N/mm² external load. Frequencies up to the low kilohertz range can be achieved.

The MSM technology has its roots in academia in the mid 1990´s. ETO MAGNETIC has developed this material as well as actuator prototypes in recent years to a new level of maturity. ETO´s new MAGNETOSHAPE® technology is now ready to conquer first applications. With its unique technological advantages it shows a clear potential to replace electromagnetic as well as other actuator technologies in the future.

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PRODUCTION OF MAGNETOSHAPE® SINGLE CRYSTALLINE MATERIAL

 

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  • Raw materials are inductively molten and alloyed at temperatures of about 1400°C

  • Large single crystals are grown using a modified Bridgman process

  • The crystals are heat treated for homogenization and microstructure formation

  • The crystal orientation is measured using X-ray methods

  • The crystals are cut into typically rectangular elements
  • The elements are trained for application

 

TECHNICAL DATA OF MAGNETOSHAPE® MATERIALS

 

 

 

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MSM ACTUATOR DESIGN PRINCIPLES

 

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MAGNETOSHAPE® SPRING ACTUATOR

■  Restoring spring opposed to the MSM element

■  Allows for extremely fast switching (~ 1ms)

■  Bistable versions with permanent magnets available

■  Different magnetic circuits available depending on required functionality (force, stroke, frequency)

MAGNETOSHAPE® PUSH-PUSH-AKTOR

■  Two MSM actuator units working antagonistically

■  Exhibits energy-efficient multistability

■  Intermediate positions are stable without current

■  Allows for precise (< 5µm) and fast position control

BENEFITS OF MAGNETOSHAPE® ACTUATORS

MAGNETOSHAPE® actuators:

■  Are energy efficient

■  Offer large work output at high frequencies

■  Allow for improved actuator construction with low friction wear

■  Exhibit extremely fast switching

■  Allow for high durability applications

■  Can be designed multistable, bistable, or monostable with fail-safe

■  Can be simultaneously thermally activated

■  Offer self-sensing capabilities

NON-ACTUATOR
APPLICATIONS 

MAGNETOSHAPE® materials can be used also for further non-actuator applications by making use of the inverse magnetic and thermal shape memory effects.

■  Sensing of position, speed, force, pressure etc.

■  Energy harvesting for remote energy supply

■  Passive and active damping

■  Use of specific compositions as high-temperature thermal shape memory alloys (SMA)

■  Thinned material (< 30 µm) for microsystem technology applications (actuation, sensing, harvesting)

■  Thin film materials are under investigation in academia