Applied Motion STRAC2 and STRAC8 AC Stepper Drives Review: Specs, Price and Applications
Updated: 4 days ago
STRAC2 and STRAC8 bring AC-line input to the STR microstepping family. They target two-phase stepper applications using step/direction or pulse/pulse commands, with switch-based setup. The internal high-voltage DC bus makes motor insulation and the approved motor combination important selection boundaries.
Quick Verdict
A straightforward option for pulse-controlled machinery where AC input and local switch setup fit the cabinet architecture. Confirm the motor’s suitability for the drive bus and the exact phase-current setting. This is not an industrial-network servo drive simply because it provides smooth microstepping.
Applied Motion STRAC2 and STRAC8 AC Stepper Drives at a Glance
Specification | Details |
Supply range | 90–240 VAC in the original manufacturer overview |
STRAC2 current | Up to 2.2 A/phase peak of sine |
STRAC8 current | Up to 8 A/phase peak of sine |
Commands | Step/direction or pulse/pulse |
Microstep setting | Up to 20,000 steps/rev with a 1.8-degree motor in the overview |
Setup | DIP/rotary switches; no software required for stated basic setup |
Motor constraint | Use an appropriately rated high-voltage-compatible motor |
Price | Request a quote for selected drive and compatible motor |
Design and Engineering Assessment
Eliminating a separate DC supply can simplify one axis, while each drive still contains power conversion. Compare the complete cabinet, isolation, thermal space and supply arrangement before assuming that AC input is cheaper for every multi-axis machine.
Microstep emulation can improve motion smoothness when command pulses have coarse resolution. It does not create additional load-position measurement or guarantee that the commanded fraction of a full step becomes the same loaded displacement.
Current, motor choice and idle-current settings affect both torque and heating. Verify peak-of-sine current units and the actual compatible motor rather than selecting a switch position from frame size alone.
Pulse Interface and Setup
Confirm the controller’s electrical pulse interface, polarity, timing and direction setup against the selected drive. Choose step/direction or pulse/pulse deliberately and retain a record of all switch positions.
The STRAC8 quick-start guide describes factory motor selections with the rotary switch. A numbered position represents a configured motor selection; it is not an arbitrary torque adjustment. Confirm any custom configuration.
Motor and Cabinet Integration
The manufacturer explicitly calls for motors able to withstand the high internal bus voltage. A low-voltage winding that looks mechanically suitable is not enough. Obtain the approved motor pairing and wiring.
Validate loaded high-speed motion, enclosure temperature and the repeated duty cycle. Fanless construction reduces moving parts in the drive; it does not remove the cabinet’s heat-removal requirement.
Applications and Selection
AC-powered OEM stepper axes controlled by a PLC or motion controller with pulse outputs.
For Applied Motion STRAC2 and STRAC8 AC Stepper Drives, define the actual machine duty before selecting an ordering configuration. Include the required operating point, available installation space, environment and control interfaces. The specification table describes the product or family; the surrounding machine determines which of those features matters for the intended job.
Price and Value
Price: Request a quote for the exact configuration. Compare the product, compatible control equipment, required mechanical parts, cabling and commissioning as one installed system. A component price alone does not represent the cost of a working automation axis.
Evaluate an alternative against the same duty and acceptance criteria. Match the continuous operating requirement first, then compare transient capability, feedback, mechanical fit and support. This avoids choosing between superficially similar products whose ratings describe different operating conditions.
Pros and Cons
Advantages
AC input avoids a separate external DC supply for the axis
Simple pulse control and switch configuration
Anti-resonance and microstep emulation
Limitations
Requires an appropriately rated motor
No automatic load-position feedback
Supply and high-voltage installation remain cabinet-design responsibilities
Who Should Consider Applied Motion STRAC2 and STRAC8 AC Stepper Drives?
Consider Applied Motion STRAC2 and STRAC8 AC Stepper Drives for aC-powered OEM stepper axes controlled by a PLC or motion controller with pulse outputs. Establish the required operating point and installation interfaces before choosing the configuration, and use a representative loaded cycle as the acceptance basis.
Applied Motion STRAC2 and STRAC8 AC Stepper Drives FAQ
Does STRAC require a separate DC supply?
The drive accepts AC line input within its specified range and converts it internally.
Can any small stepper motor be connected?
No. Confirm the motor’s electrical and insulation suitability for the high internal bus.
Are the current maxima RMS values?
The manufacturer overview identifies peak-of-sine phase current.
Does 20,000 steps/rev establish accuracy?
No. It describes command subdivision, not measured loaded-axis accuracy.
Which pulse modes are supported?
Step/direction and pulse/pulse, configured according to the selected drive instructions.
Is software required for basic setup?
The stated basic configuration uses DIP and rotary switches.
Does a fanless drive produce no heat?
No. Provide appropriate mounting and enclosure heat removal.
What belongs in an acceptance test?
Loaded motion over the required speed range, warm repeated duty and verified command/stop behavior.
Prices are indicative and may change. Confirm the final configuration, commercial terms and delivery schedule before ordering.
