如何在工業(yè)物聯(lián)網(wǎng)中通過能量獲取獲取機器診斷

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　　來自工業(yè)設(shè)備的診斷數(shù)據(jù)是物聯(lián)網(wǎng)的關(guān)鍵資源。遠程監(jiān)控設(shè)備的狀態(tài)使操作員能夠識別有問題的機器。這些數(shù)據(jù)甚至可以預(yù)測哪些系統(tǒng)是失敗的，并取代它們作為日常維護的一部分，而不是災(zāi)難性的和昂貴的故障。

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　　與物聯(lián)網(wǎng)，所有這些數(shù)據(jù)可以在云中進行分析，提供警報和儀表板，讓監(jiān)測從世界任何地方。然而，有一個關(guān)鍵的挑戰(zhàn)，這個模型，這實際上是獲取數(shù)據(jù)。雖然現(xiàn)代系統(tǒng)可能有內(nèi)置的診斷，這些可能無法連接到云，和舊設(shè)備可能是極其有限的監(jiān)測電子產(chǎn)品。這可能是由于缺乏傳感器和通信鏈路和可用的電源。

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　　Energy harvesting is providing a key capability for monitoring and diagnostics in the industrial Internet of Things. Being able to power a wireless sensor node from energy in the environment allows these nodes to be attached to equipment at the point at which the operator can get the best value from the data.

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　　A variety of energy harvesting sources can be used to acquire this key diagnostic data. One particularly elegant approach is to use the vibration of industrial equipment to both power the wireless node and act as the sensor. A piezoelectric sensor can be tuned to the resonant frequency of the vibrations from the equipment and this can be used to power the wireless sensor node. A sophisticated power manager that is optimized for energy harvesting， such as Linear Technologies’ LTC3588， can then capture and modify the current from the piezoelectric crystal to power the wireless transceiver. Evaluation boards from SparkFun Electronics （shown in Figure 1） provide the links into the LTC3588 to connect to the power source. Four output voltages， 1.8 V， 2.5 V， 3.3 V and 3.6 V， are pin selectable from the device with up to 100 mA of continuous output current; however， the output capacitor may be sized to service a higher output current burst. An input protective shunt set at 20 V enables greater energy storage for a given amount of input capacitance.

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