Modelling, design and characterization of Shape Memory Alloy-based Poly Phase motor

The high potential of shape memory alloys in developing miniature mechanical devices: A review on shape memory alloy mini-actuators

“…Using a 0.2 mm SMA wire, each drive module can provide a maximum displacement of about 30 mm and a force of up to 4 N. The output SMA wire of the two drive modules are connected to a pulley inside the gear module, producing the rotation of an output shaft connected to the gear pulley. The maximum angular range is 180 • , while the maximum output Sharma et al studied a poly-phase motor based on SMA wire [23,24]. The three phase one has the dimensions of 150 × 150 × 20 mm; it is made up of three SMA wires (diameter 0.35 mm and length 120 mm) in series with a linear spring, which is in turn fixed to a cam and to an adjustable anchor.…”

A compact rotary motor actuated by shape memory alloy mini springs

“…The maximum theoretical torque value found was 2.91 Nmm for the deactivated spring. The cogging torque is generated due to frictional forces, vibrations and unbalance, and its amplitude is estimated as 10% of the maximum reaction torque generated when the springs are deactivated (Sharma et al, 2008a).…”

“…Sharma et al (2008a, 2008b, 2008c) constructed a continuous and bidirectional rotating motor where three SMA wires are connected to an eccentric axis producing motion through the alternate activation of these wires. Nespoli et al (2010a) presented a new rotational mini actuator, denominated ROTOsma-1, consisting of two antagonist SMA elements with a snake-like shape.…”

“…The present design employing an eccentric axis is similar to that developed by Sharma et al (2008a, 2008b, 2008c). However, several components such as pulleys, extension rods and metallic bases are absent in the proposed motor.…”

Optimal design of rotary manipulators using shape memory alloy wire actuated flexures

“…Thus SMA actuators of one-way effect, especially wire and strip type alloy, are more attractive in aerospace and robotic applications. Repetitive motion is achieved by passive elastic force [9][10][11][12][13][14] or opposing (antagonistic) SMA actuator pairs [15][16][17][18]. Regardless the applications of SMA, it is limited by its hysteresis and slow response time.…”