Reliability and service life

Piezo Actuator Drive (PAD) - Standard & custom product

Since internal forces in the PAD motors are comparatively low, and all structures have to be very rigid to reduce elasticity, most parts are rather oversized and will survive longer than ever needed.

The two most critical parts are the actuators and the toothing. However, the actuators in the prototypes are made for more than 3x10⁹ load cycles, which in case of the PAD corresponds to about 3000h operation at full speed (which only occurs in applications where PADs are not the obvious choice).

The motor has been tested on a specifically designed test bench and subjected to more than 10⁷ load changes, and no breaking of teeth was observed due to the low surface pressure and the large number of teeth.

Tooth geometry

• Tooth module (corresponds to diametral pitch): 38 μm
• Depth 36 μm

• Number 312 (shaft), 313 (ring)

• Spacing 120 μm

• Length 6 mm