Looking at these voice coil linear rotary actuator:
VLAR Series - DH-Robotics
The VLAR series of voice coil linear rotaty actuators from DH-Robotics are compact and thin in design, with a hollow axis design. Their unique Z-axis linear…
Has anyone used one of these before? Any drawbacks? What is the difference between magnetic encoder and optical encoder? It doesn't look like it uses vacuum.