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Memory alloy drive line

The memory alloy drive wire is a wire material with no less than 2%two-way memory effect or no less than 6%one-way memory effect,which is made by using the memory recovery characteristics of TiNi shape memory alloy,and can be electrically heated to achieve driving work.It is also called electrically contracted titanium wire or muscle wire.By energizing the shape memory alloy wire,the alloy wire will undergo phase transformation and its length will be shortened,so as to achieve the driving effect.By controlling the magnitude and time of the current loaded on the alloy wire,the contraction speed can be controlled. The energy density of memory alloy driving wire is 1000 times higher than that of human muscle and 4000 times higher than that of electromagnetic motor.Therefore,the shape memory alloy driving wire can be made into a device with small volume and weight but large driving force.Compared with electromagnetic motor,SMA motor made of shape memory alloy driving wire has the characteristics of small volume,low power consumption,fast response,quiet and long service life.

Product accessories：

◆ Product parameters

	One way	round-trip
Specifications（mm）	φ0.05~φ0.50	≥φ0.05
surface state	Black bright state	Black bright state
Recoverable strain (no load)	≥2%	≥6%
Tensile strength RM（MPa）	≥1200	≥1000
Yield strength (reu)（MPa）	/	100~300
Elongation at break（%）	≥3	≥10
Elastic modulus E（GPa）	35~45	/

Dimensions and tolerances
Wire diameter D (mm)	0.10~0.30	0.30~0.50
Tolerance (mm)	±0.005	±0.01

◆ Principle

When the driving wire of memory alloy changes its temperature under a certain load, the wire will shrink due to the phase transformation between martensite and austenite. Since the resistance value of the drive wire is high, the wire can be easily heated by energizing and heating. Therefore, as shown in the figure, on / off of the current can be used as the actuator drive.

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◆ Characteristic

When the NiTi based shape memory alloy drive wire is energized or heated,it will shrink in the length direction,and output the driving stress during the contraction process to achieve the purpose of action.It has the characteristics of highly integrated structure,sensor and driver.Among the existing intelligent materials,shape memory alloy drive lines have the highest energy density,high drive frequency,large output strain and stress,light weight and small volume.Therefore,there is a large space in the lightweight design requirements.Compared with small motors,magnetic spiral tubes,wax drivers,double metal plates and other actuators,shape memory alloy drive lines have obvious advantages.
● linear angular drive
● high specific power
● simple structure
● silent drive
● precise control
● lightweight

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◆ Data

model	diameter [mm]	resistivity [Ω·m]	Recommended load: [N]	Recommended drive current [A]	Recommended power on duration [s]	Suggested response [%]
SMA01	0.1	3.2	≤1.3	0.35	≤0.4	≤3.5
SMA15	0.15	1.4	≤3.0	0.75	≤0.5	≤3.5
SMA18	0.18	1.14	≤4.3	0.90	≤0.5	≤3.5
SMA20	0.20	0.74	≤5.3	1.00	≤0.8	≤3.5
SMA25	0.25	0.47	≤8.3	1.50	≤0.8	≤3.5
SMA30	0.30	0.34	≤12	2.10	≤0.8	≤3.5
SMA40	0.40	0.18	≤21	3.50	≤1.0	≤3.5
SMA50	0.50	0.12	≤33	5.50	≤1.0	≤3.5

Effect of load stress on phase transition temperature (AF)
	The phase transformation temperature of alloy wire is different under different stress. The phase transition temperature increases with the increase of load.

	Compared with no load, the phase transformation temperature of alloy wire increases by about 20 ℃ at 170Mpa.

◆ Application

　　Using the excellent two-way memory effect and fatigue performance of the memory alloy drive line, the micro electric drive adjustment and locking and unlocking functions of precision parts can be realized.
　　

► Automobile: heat dissipation mechanism, release mechanism, trunk, storage box release mechanism, automobile seat lumbar support structure;

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　　► 3C industry: mobile phone anti shake lens, UAV, handheld camera head, memory card ejector, etc;

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　　► Hardware: electronic control lock of express cabinet can replace the motor to realize real-time drive

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　　► Artificial intelligence: holding equipment, flexible robot fingers, underwater core sampling robot, underwater robot release latch, pneumatic transmission device replacement, biosensor assistance

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keywords：

alloy drive wire memory

classification：

actuator

None

Electric control lock (electric contraction wire)

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