These types of system require the same number of signal cables as

These types of system require the same number of signal cables as there is sensor units, yielding a sellectchem complicated signal wiring system. In addition to the high costs of machining processes, the sensor cable assembly no may also cause damage, further lowering the reliability of the motor monitoring system.The development of wireless and powerless sensing nodes aims Inhibitors,Modulators,Libraries to lower costs and increase the reliability of the motor monitoring system as due to its simple wiring, the deployment of the novel-sensing node offers low costs. The performance of the monitoring system and its ability to improve system reliability was investigated in this study.

Since fault signatures usually originate from abnormal vibrations the Inhibitors,Modulators,Libraries vibration sensors demand higher data transfer rates than other temperature, or pressure, sensors that are employed for motor Inhibitors,Modulators,Libraries monitoring, therefore, this study focused on vibration measurements.

2.2. MEMS accelerometerA MEMS (Micro Electro-Mechanical System) sensor was employed for wireless and powerless sensing nodes. Compared with the piezoelectric accelerometer employed by traditional monitoring systems, the MEMS accelerometer is silicon micro-machined, and therefore, can be easily integrated with the signal processing Inhibitors,Modulators,Libraries circuits. Moreover, the power consumption of the Inhibitors,Modulators,Libraries MEMS accelerometer has clear specification, as provided by the manufacturer, facilitating the self-powered generator design. The commercial Inhibitors,Modulators,Libraries product, Kionix KXPA4 series accelerometer [11], was selected for this study.

Specifications and their comparisons to the traditional piezoelectric accelerometer, namely the KISTLER type 8636C5, are listed in Table 1.

With the exception of the lower resonant frequency, the MEMS accelerometer has similar Inhibitors,Modulators,Libraries performance to the piezoelectric system. Note the listed details of Inhibitors,Modulators,Libraries GSK-3 power supply demands of the MEMS accelerometer including voltage, current, sleep modes, and wake-up times of power consumption, which can be useful information for self-powered generator designs. The piezoelectric accelerometer sensor operations rely on the power supply of the front-end amplifier, which is connected directly to the analysis instrument. No power supply information can be referred.Table 1.

Comparison of the MEMS accelerometer and piezoelectric accelerometerThe MEMS accelerometer element functions on the principle of the differential capacitance of the micro machined structure of the silicon chip.

Acceleration selleckchem AZD9291 causes the displacement of a silicon structure Cilengitide resulting in capacitance changes, which can provide tri-axial vibration third detection of a variety of upper frequencies. In this study, x-axis with 3.3 kHz resonant frequency was employed for motor radial direction vibration measurements.The chip embedded signal processor, using a standard CMOS manufacturing process, detects and transforms changes of capacitance into an analog output voltage, which is proportional to acceleration.

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