http://www.powermanagementdesignline.com/news/208401936
By Vince Biancomano Power Management DesignLine (06/03/2008 10:16 HΠEDT)
Irvine, Calif.—Perpetuum (Southampton, UK) and CAP-XX Limited (Sydney, Australia) have collaborated to deliver what they say is the world's first energy harvesting-and-supercapacitor system for powering large wireless sensor networks. In a paper presented today at the Darnell Group's nanoPower Forum, CAP-XX's Pierre Mars reported on the results of field trials at the Nyhamna gas plant in Norway to evaluate the system, which uses Perpetuum's PMG17 vibration energy-harvesting microgenerator and CAP-XX's supercapacitors. So-called "condition monitoring" solutions traditionally depend on engineering personnel for manual data collection, or the use of battery-powered remote wireless sensors. The limited lifespan of the larger battery-powered systems in harsh environments, and the cost of replacing and disposing of old batteries, work against their use. "The microgenerator and supercapacitor combination eliminates battery reliability issues and time-consuming maintenance, while enabling significant savings in operational costs and energy use," said Stephen Roberts, technical manager for Perpetuum. "Wireless system manufacturers can now easily design battery-free systems using this 'fit and forget' self-generating power source," said Mars. In operation, the system uses the PMG17 to convert mechanical vibration into electrical energy (source provides 0.5 to 50 mW), and the CAP-XX supercapacitors for energy storage. Ultimately, the wireless sensors nodes can be powered indefinitely. The energy requirements include the power needed to transmit sensor condition data over wireless networks such as IEEE 802.15.4 (Zigbee) and 802.11 (WLAN). The microgenerator will support the power requirements of intermittent radio sensor systems such as Wireless HART, SP-100, and Wi-Fi in industrial applications. Generally, however, larger sensor systems require tens to hundreds of milliwatts, and the use of a supercapacitor provides the required peak power for data transmission.
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(2)Battery-free wireless condition monitoring
http://www.factorymaintenance.com.au/articles/Battery-free-wireless-condition-monitoring_z173620.htm
CAP-XX, an Australian supercapacitor manufacturer, has joined forces with Perpetuum to create battery-free condition monitoring systems to manage assets in factories.
The new system uses Perpetuum’s PMG17 vibration energy-harvesting micro-generator to provide a small but steady stream of energy which is stored in the supercapacitor. The energy is then used to power wireless sensor nodes when needed.
According to the companies, traditional solutions for condition monitoring would have maintenance engineers manually and physically collecting data, or require the use of battery-powered wireless sensors. The batteries tended to have short lives because of the harsh environments, costing plant operators significant amounts of money to replace and dispose of batteries.In the new system, the accumulated power generated from machinery vibration is used for intermittent data transmissions from the battery-less wireless sensor nodes. It is suitable for sensor systems such as Wireless HART, SP-100 and Wi-Fi.The manufacturers claim the combination of the micro-generator and supercapacitor means battery reliability is no longer an issue, while at the same time eliminating time-consuming maintenance and providing savings in operational costs and energy use.
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(3)Battery free condition monitoring
http://www.newelectronics.co.uk/article/14303/Battery-free-condition-monitoring.aspx
Energy scavenging specialist Perpetuum and supercapacitor developer CAP-XX have combined their technologies to produce a battery free machinery condition monitoring system. “The microgenerator and supercapacitor combination eliminates battery reliability issues and time consuming maintenance, whilst enabling significant savings in operational costs and energy use,” said Dr Stephen Roberts, technical manager for Perpetuum. The PMG17 microgenerator converts mechanical vibration into useable electrical energy. After being stored in a CAP-XX supercapacitor, this energy can power wireless sensor nodes indefinitely, say the companies. The supercapacitor stores the energy harvested by the PMG17, then delivers the peak power needed to transmit sensor condition data over wireless networks such as IEEE802.15.4 (Zigbee) and 802.11 (WLAN). The microgenerator’s output is said to be high enough to meet the power needs of intermittent radio sensor systems, such as Wireless HART, SP-100 and Wi-Fi in industrial applications, but its output impedance is said to be too high to supply the power required by sensor nodes during data collection and transmission. However, the high capacitance and low equivalent series resistance of the supercapacitor allows peak power to be generated for approximately one second – long enough for data to be transmitted. In a field trial at Shell’s Nyhamna gas plant in Norway, the PMG17 and CAP-XX supercapacitor system was used to power wireless sensor nodes. Operating in a wide range of temperatures, the sensors monitored the condition of rotating equipment, reporting temperature and overall vibration every five minutes. For more on the trial: http://www.cairnstone.co.uk/PDF%20Files/Norwegian_Technology_01.pdf
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