Flat Linear Motors vs. Ball Screw drives
Ball screw drives are sofisticated structures with a complex chain of multi-stage conversion of energy into rotational motion and then rotational motion into linear motion – with backlashes, a large dead zone and uneven coarse feeds. There is a long delay from the command pulse to the start of movement at the start and each reverse. And if in such a drive there are also reductors (belt or gear), then the delays grows almost into idle time-outs:
command impulse
interaction energy
of magnetic fields
rotation of the motor rotor
(functioning of a belt
or gear reducer, if any)
ball-screw rotation
ball-screw backlash play
linear movement
(ball-screw movement)
A long distance
from a command
to execution!
Linear drives with flat (planar) linear motors are an extremely simple construction with non-contact transmission of force, a direct drive without any kinematic chain for converting energy into motion and rotational motion into linear motion, without backlash, dead zone and uneven bumpy feeds. In fact, the moving part of a linear motor is also a mover. All that happens when processing each motion is:
command impulse
interaction energy
of magnetic fields
linear motion
And that is all!
Barely moments
from a command
to execution!
Linear Motors
correct the gap
100s times per sec
with feedback response
and linear scales resolution of
10 nanometers