Microstep drive for OEM applications

Mclennan has released a miniature microstepping drive, aimed at OEM applications requiring step and direction control of smaller 2-phase stepper motors. The STR3 from Applied Motion Products (AMP) -Mclennan’s US distribution partner – is designed to control stepper motors from NEMA size 8 to 24. It measures 55 x 45 x 28mm, features up to 3A peak current and offers simple dip-switch set-up with sophisticated features found on more expensive microstepping drives.

Users can select step/direction or CW/CCW pulse control with full-, half-step and a wide choice of microstepping resolutions to 20000 steps/rev. A microstep emulation feature also allows smooth motion even when the available control pulse count is low. With electronic damping and a selectable digital input filter, application set-up can be optimised for motor smoothness and torque over a wide speed range with maximum resilience to command signal electrical noise.

With its 12 to 48Vdc supply voltage and selectable peak current ratings from 0.3 to 3.0A/phase, the STR3 is claimed to provide user flexibility where OEMs and machine builders need to automate simple processes using PLCs, PACs or pulse generating motion controls. With selectable idle current reduction the drive will also provide the efficiency required for battery and energy-critical applications. Circuit protection includes short circuit, over-voltage, under-voltage and over temperature. For ease of installation, the drive features pluggable screw terminals for power and signal inputs whilst an integrated self-test move profile and status LEDs assists commissioning.