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ASB340C801ND0LF Datasheet(PDF) 6 Page - Kemet Corporation |
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ASB340C801ND0LF Datasheet(HTML) 6 Page - Kemet Corporation |
6 / 12 page 6 © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com P0102_ASB • 4/6/2016 Multilayer Piezoelectric Actuators – ASB Series Metal Sealed 85°C Reliability The majority of failure modes on multilayer piezoelectric actuators are short-circuits due to degraded insulation. Although the cause of degradation of insulation has not been clarified, it has been found that the failure rate varies greatly between static uses (DC voltage application) and dynamic uses (pulse voltage application). Like other electrical components, piezoelectric actuators can be affected by humidity as well as applied voltage and ambient temperature. KEMET has added the metal sealed piezoelectric actuators featuring high reliability by eliminating the effects of the ambient atmosphere. This section describes reliability guidelines for static and dynamic usage of the metal sealed type actuators. Reliability of our multilayer piezoelectric actuators is represented by MTTF (mean time to failure) in case of static usage. The number of repetitions is considered to represent the reliability in the case of dynamic usage. DC Voltage Application MTTFr of the metal sealed type under the actual operating conditions is calculated from the reference MTTFs and the acceleration factor as it is in the case of the resin coated type. However, since the internal element is sealed from the atmosphere, it is not affected by the atmospheric humidity. Therefore, equation (1) below is used. (1) MTTFr = MTTFs × A v × At MTTFr : Estimated value MTTFs : Reference value (= 36,000 hours) A v: Acceleration factor for drive voltage = (100/VR) 2 V R: Actual operating voltage (V) A t: Acceleration factor for ambient temperature = 1.5 (85 -Tr)/10 T R Actual ambient temperature (ºC) The following calculation is made for the case of use at 25°C, and 150 V. MTTFr = 36,000 X (100/150)2 X 1.5(85-25)/10 = 36,000 X 0.44 X 11.3 ≈ 179,000 hours (20.4 years) Pulse Voltage Application Similarly to the resin coated type, it is extremely difficult to estimate reliability for the metal sealed type products by using an equation. In KEMET’s testing on the ASB170C801NP0, there was no failure confirmed up to 1,000 hours (equivalent to 100 million pulses applied) under the conditions below: Temperature: 85 ±2°C Humidity: 90 to 95% RH Load: 200 N to 500 N (20 kgf to 50 kgf) Drive voltage waveform: rectangular wave, 30 Hz, 0 to 100 V, duty ratio at 30% |
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