Spindle drive delivers very high accuracy
Aerotech's ASR series brushless direct drive spindles delivery a velocity
ripple of less than 0.1%, an axis total radial error of 3 micrometres and
a total axial error of 1.5 micrometres. And as the motor and encoder
share a common shaft without gear trains or couplings, there are no
position errors arising from backlash, wind-up or hysteresis. Match
angular contact bearing sets maximise correction of error motions, and
the spindle is balanced to ISO 1940 G1.0.
With no brushes to wear, the unit is practically maintenance-free, while
the motor's electromagnetic design ensures lower running temperatures
compared with some rival products. The spindle sealing is via a labyrinth
arrangement that minimises particle migration from the unit; this allows
it to be used for Class 1 clean room duties.