I am designing a multi modal stent testing machine which will bend, twist, and compress stents (very thin, light, and fragile cylindrical meshes for in arteries) in a tube. The machine will operate at maximum 3.6 Hz for months at a time (> 40 million cycles). As the machine will be in a lab with people, the noise should be minimal. I am choosing actuators for my design but was overwhelmed by the range of products available.
For rotating the stents around their axis, I will need a rotary actuator with the following specs:
- torque: negligible max angle: 20 deg
- angular velocity needed: max 70 deg/s
- hollow shafts are a plus
For compressing the stents, I will need a linear actuator with the following specs:
- force: low (<1N)
- max stroke: 20mm but if possible 70mm for allowing different stent lengths
- stroke velocity needed: max 120mm/s
Price of these motors is not the driving factor.
I looked into stepper motors, servo motors, and piezoelectric motors. There seems to be s huge selection that fits my requirements. If all motor types have a reliability that suits my needs, which characteristics/advantages/disadvantages should I consider that determine the selection of suitable actuators? I do know what the difference is between the motor types, but there is a lot of overlap. Concrete suggestions are welcome.