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App-Linear Stepper vs Ball Screw

LINEAR MOTOR

Linear Stepper Motors and High Lead Ball Screws (accuracy comparison)

High lead ball screws are compared to IntelLiDrives linear stepper motors. Even though small lead precision ground screws may be somewhat more accurate that high lead screws, they significantly limit linear speed. Ball screw is assumed to be driven by two phase rotary stepper motor with micro-stepper drive to achieve high precision. Thermal expansion errors, equivalent for both systems, were not considered in this analysis.

IntelLiDrives linear stepper motors			40 mm High lead ball screws
parameter	2 phase linear stepper(without cycle error correction)	2 phase linear stepper (with cycle error correction)	parameter	value
cumulative pitch error	0.0004" over 12" (10 mkm over 300 mm)		accumuluated ref. lead error Ec	25 mkm over 300 mm
cyclic error	0.0006" (15 mkm)	0.0002" (5 mkm)	variation e_c	20 mkm
			variation e_2pi	8 mkm
			rotary motor full step error (3% full step)	6 mkm
			motor microstep error (5% full step)	10 mkm
TOTAL ACCURACY	0.0001" (25 mkm)	0.0006" (15 mkm)		0.0027" (70 mkm)

hysteresis	0.0004" (10 mkm)		axial play	10 mkm

Linear and Rotary Motion in its Simplest Form™

App-Linear Stepper vs Ball Screw

LINEAR MOTOR

Linear and Rotary Motion in its Simplest Form^™