ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Muscle WireOutlineOutline (cont)Reference listTo explore further (survival pointers of web references etc)What is muscle wire?Major applicationsBasic Working PrincipleTypical ConfigurationMajor SpecificationsMajor Specifications (cont)Slide 12Slide 13Slide 14AdvantagesLimitsLimits (cont)How to ChooseWhere to buyCostECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: Muscle WirePrepared by:Nate HigbeeDept. of Electrical and Computer Engineering Utah State University3/10/200601/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To probe further–What is Muscle Wire–Major applications–Basic working principle illustrated–A typical sample configuration in application (application notes)–Major specifications01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Outline (cont)–Advantages–Limitations–And many more relevant issues in applications (such as, how to choose, cost information, where to buy etc.)01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4Reference list•www.mondotronics.com•www.robotstore.com•Muscle Wires Project Book01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5To explore further (survival pointers of web references etc) •Google Search•Lots of companies selling robotic items01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6What is muscle wire?•Shape Memory Alloy (SMA)•Nickel-Titanium•When heated by something like electric current, the wire contracts.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Major applications •Robotics•Animated Floral Arrangements•Arterial Stents•Cell phone antennas(flexibility, not actuator)•Orthodontics (flexibility, not actuator)•Eyeglasses (flexibility, not actuator)01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Basic Working Principle•When created the wire is set in a specific shape and heated. This sets the “memory” of the metal to that specific shape. When at room temperature the material is “relaxed” and can be stretched. When heated, by electric current for example, the wire returns to its shorter “memorized” state or shape.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Typical Configuration01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Major Specifications•Physical- Wire Diameter- Minimum Bend Radius- Cross-sectional Area•Electrical- Linear Resistance- Recommended Current- Recommended Power01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Major Specifications (cont)•Strength- Max Recovery Weight- Recommended Recovery Weight- Recommended Deformation Weight•Speed- Typical Contraction Speed- Relaxation Speed- Cycle Rate01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Major Specifications (cont)•Thermal- Activation Start Temp- Activation Finish Temp- Relaxation Start Temp- Relaxation Finish Temp- Annealing Temp- Melting Temp- Specific Heat- Heat Capacity- Latent Heat01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Major Specifications (cont)•Material- Density- Maximum Recovery Force- Recommended Deformation Force- Breaking Strength- Poisson’s Ratio- Work Output- Energy Conversion Efficiency- Maximum Deformation Ratio- Recommended Deformation Ratio01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14Major Specifications (cont)•Phase Related- Resistivity- Young’s Modulus- Magnetic Susceptibility- Thermal Conductivity01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Advantages•Small Size•Light Weight•Low Power•High strength-to-weight ratio•Precise Control•AC-DC Activation•Low Magnetism•Long Life•Linear Action01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-16Limits•Actuation dependant on heat – the temperature of the environment can adversely affect performance.•Temperature – Muscle wires cannot be overheated•Speed – Muscle wires contract and relax only as fast as they can be heated and cooled.•Stress – Muscle wires cannot be overstressed01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-17Limits (cont)•Range – Muscle wires cannot reliably contract more than 5% of their length.•Lifetime – Muscle wires will eventually wear out, depending on the load.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-18How to Choose•Choose based on force, speed, and temperature requirements.•It is useful to consider all the parameters listed under “Major Specifications”01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-19Where to buy•Mondotronics•Jameco01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-20Cost•Dependant on quantity and diameter:Flexinol 025 LT 1 meter $24.95Flexinol 150 LT 1 meter $16.95Flexinol 375 LT 1 meter
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