• Why a stepper motor / actuator? • Unlike other motors, stepper are unique, as they move a given amount of rotary motion for every input pulse. • Can-stack motors will step 7.5 or 15 rotational degrees for each input pulse. • Hybrid motors will step 0.9 or 1.8 rotational degrees for each input pulse. • This allows the motor to be used very effectively for positioning applications. ELECTROMATE Toll Free Phone (877) SERVO98 Toll Free Fax (877) SERV099 www.electromate.com [email protected]
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• Why a stepper motor / actuator?• Unlike other motors, stepper are unique, as
they move a given amount of rotary motion for every input pulse.
• Can-stack motors will step 7.5 or 15 rotational degrees for each input pulse.
• Hybrid motors will step 0.9 or 1.8 rotational degrees for each input pulse.
• This allows the motor to be used very effectively for positioning applications.
following application needs:– force = 15 lbs– travel = 3 inches– time to achieve the travel = 6 seconds– number of desired cycles = 1,000,000– linear velocity = 3 inches / 6 sec. = 0.5
• ACCURACY:• The difference between the theoretical distance and the actual
distance traveled is the actuator’s accuracy.• Example: For an actuator utilizing a screw with a 1” lead, 360
deg of rotary motion will result in a theoretical 1” stroke. Due to manufacturing tolerances in the components of the actuator, the actual travel will be slightly different. The magnitude of this difference is the accuracy of the actuator.
• REPEATABILITY:• The range of positions attained when the actuator is
commanded to approach the same target multiple times under identical conditions.
• Example: Allow the actuator to extend a given distance from it’s home position. Measure and record this distance and call it “x”. Retract the actuator back to it’s home position. Command the actuator to return to the commanded distance “x”. The difference between the new distance traveled and the original distance “x” is repeatability.