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TDK optimises piezo actuators' performance

Posted: 28 Aug 2014     Print Version  Bookmark and Share

Keywords:piezo actuators  EPCOS  automobiles 

The third generation of EPCOS piezo actuators from TDK Corporation comes with copper internal electrodes, offering both improved performance and higher cost-effectiveness.

These actuators are characterised by their outstanding stability and reliability. They can complete a billion switching cycles without failures at 170°C. Silver-palladium actuators already exhibit significant failure rates under these extreme conditions. The new copper piezo actuators thus set the benchmark with respect to operating life. The maximum number of cycles even under harsh operating conditions such as high temperature and humidity is one of the most important criteria for the use of piezo actuators in energy-efficient fuel injection systems for automobiles.

Piezo actuators

The third generation of EPCOS piezo actuators with copper electrodes is designed with a minimum proportion of inactive zones in the multi-layer actuator and thus achieves the highest possible volume efficiency. As a result, the actuator performance is 20 per cent higher than that of conventional designs of the same size. The basis for this is a ceramic material newly developed by TDK, whose piezoelectric coupling—conversion of electrical power into mechanical power—is higher than 75 per cent.

TDK is still the only company to use relatively inexpensive copper for the internal electrodes of its piezo actuators. In contrast, competitors use silver-palladium alloys. In the case of very high proportions of silver in the electrode material, however, silver migration can occur and thus cause failure of the actuators—especially under high humidity conditions.

In addition to the use of copper internal electrodes, TDK has developed a new lead-free high melting metal bond that exhibits no loss of contacting, even at high temperatures. The new piezo actuators withstand a 2,000-hour test at 200°C with no signs of embrittlement.

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