Review of 8-mm Piezoelectric Motor Connection Methods Page: 18 of 31
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Figure 14. Soldered Asymmetric Ring-Tab Cable
"Rabbit-Ear" Flexcable Designs
The ring-tab cable design was again modified so that the cable conductors entered the top of the PZT
ring in one small area (at the 12 o'clock position) and continued around (in each direction) to offer better
bonding areas on each element. It was believed this would reduce both bond stress and cable stress. This
cable design was nicknamed the "rabbit-ear" cable due to the long leads that look like floppy rabbit ears.
It consists of ounce per square foot copper (0.0007-inch thick) bonded to 0.001-inch thick Kapton
with 0.0005-inch thick adhesive. In some areas, a 0.0005-inch thick cover layer of Kapton is bonded on
top with 0.001- inch thick adhesive. The center section that attaches to the stator and the leads that
connect to the PZT ceramic element were designed to be very flexible, and do not include the top layer
of Kapton. This design has two wires that act as the pins that attach and ground the cable to the center
web of the motor. The original version of this "rabbit-ear" design had bare copper next to the PZT
elements and no soldering holes in the top Kapton layer. For development, a conductive adhesive bond
would be used to attach the cable to the PZT elements. For production, it was preferred to reduce or
eliminate organic materials contained in epoxies and adhesives from the motor fabrication process, to
reduce long-term outgassing and aging deterioration. The cable ears were thus designed to allow
soldering in the future. To increase cable flexibility and conformity to the stator bottom, three concentric
slits were laser-cut through the Kapton cable, between the conductors. See Figure 15. These cuts allowed
the power conductors to bend and contact the PZT elements on the outside perimeter and the ground
conductors to contact the web on the inside, with minimal mutual stress to both. To allow soldering, four
access holes were ablated through the top Kapton layer over each ear of the cable. See bottom of Figure
15. Either adhesive film or soldering could be used to bond the cable with this method. This seemed to
be the best combination of flexibility and strength for getting power to the moving PZT ring. These
cables were fabricated by Pioneer Circuits, Inc. of Santa Ana, CA.18 of 31
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Barben, C. L. & Yerganian, S. S. Review of 8-mm Piezoelectric Motor Connection Methods, report, June 8, 2000; Kansas City, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc707989/m1/18/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.