Eliminate resonance in stepper motor ball screw assemblies

Plymouth, Minnesota: Step-Flex, the new class of shaft couplings from Miki Pulley, eliminates resonance in stepper motor ball screw assemblies. Now with this video, system designers can see how this two-part elastomer element combination coupling operates. Step-Flex Couplings are designed to mechanically tune the system for optimal performance when a stepper motor is used to drive a linear actuator.

The Step-Flex features a combination of HNBR (black) rubber element flanked by smaller, softer laminated (green) spacers. This design quickly dampens oscillations, thereby suppressing resonance. The coupling’s machined aluminum hubs also provides a low moment of inertia.

With the unique Step-Flex design, the hard (black) element is separated from the aluminum alloy hubs by a softer (green) elastomer. This maintains enough torsional stiffness for precise positional accuracy while still allowing for minimal angular and parallel misalignment, and absorbing vibration. The power-transmitting element, consisting of different hardness layers, achieves a reduction in counter force generated by misalignment. This can greatly reduce the load on the bearing, which results in reduced heat load.

Specs:

• 5 sizes available
• Torque: 53 in-lb (6Nm)
• Bore size range: 1/8” to 5/8” (3mm to 16mm)

Step-Flex applications include automation of all types where ball screws are used including packaging, semi-conductor assembly, laboratory automation and medical equipment.

Source: Miki Pulley