Magnetically Preloaded Linear Stepper Motor,a linear motor,product,STS-1220-APM
Magnetically Preloaded Linear Stepper Motor, STS-1220-APM

This dual axis linear stepper motors are ideal for high-speed open loop positioning applications.  They can perform at speeds of up to 80 in/sec [2 m/sec] and strokes of up to 68 in [1.7 m].  Linear stepper motors are capable of very precise position, velocity, and acceleration control when coupled with a micro-stepping drive and indexer. 

The moving assembly called the “forcer” is supported by magnetically preloaded air bearings that are imbedded in the active surface of the forcer, and on a single side of the platen to minimize the physical contact of bearings on the platen.  The bearings are designed to support the customer’s payload and to maintain the required 0.0005 in to 0.0010 in [12 to 25 micron] air gap between the platen and the forcer. 



The step and direction signal for each axis comes from a micro-stepping drive (2 or 4 phase).  A 2 axis indexer is required to send step and direction signals to the drivers.  For 2 phase motors, the full step is 0.010 in [250 microns] and for 4 phase motors the full step is 0.005 in [125 microns].  With micro-stepping, resolutions in the order of 0.5 to 1 micron are achievable.

Bearing TypeAir Bearing
Forcer Mass.925 lbs419 grams
Platen Mass1 lbs/in2 grams/mm
# of Phases2
Resistance @ 20C1.15 ohms
Inductance @ 20C1.15 mH
Electrical Time Constant1.1 msec
Force11 lbs48.8 N
Current3.75 amps
Forcer Length4.5 in114.3 mm
Forcer Width2.44 in62 mm
Forcer Height1.51 in38.4 mm
Max Length1 in2 mm
Width1.96 in49.8 mm
Thickness.75 in19.1 mm
Product Drawing

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