Experimental Study of Macro Fiber Composite-Magnet Energy Harvester for Self-Powered Active Magnetic Bearing Rotor Vibration Sensor

Abstract

The paper presents the design, fabrication, and characterization of an energy harvester for an active magnetic bearing (AMB) rotor vibration using a macro fiber composite (MFC) with magnetic coupling. The MFC cantilevers configuration, together with neodymium magnets, is used for the contact-free rotor radial vibration self-powered sensor. The permanent magnets attached to the rotor and to the four MFC element beams ensure the mechanical energy transfer and the MFC cantilever vibration excitation. In the proposed prototype, the MFC transducer output voltage depends on the air-gap between two magnets. This paper investigates the optimum conditions to harvest as much as possible electric energy at different clearances and rotational speeds. Furthermore, to assess the rotor vibration sensitivity, the experimental results of the MFC-magnet self-powered sensor are compared with measurements obtained using a fiber optic sensor. The maximal obtained harvesting power equals 673.47 µW for the rotor speed of 3150 rpm. Moreover, the MFC cantilever was proposed as the rotor vibration sensor. The MFC-magnet self-powered vibration sensor output was compared with the fiber optic laser sensor. The mismatched vibration amplitude for both sensors does not exceed 1 µm.

Impact of a Connection Structure of Macro Fiber Composite Patches on Energy Storage in Piezoelectric Energy Harvesting from a Rotating Shaft

“…Many researchers use the commercial EH300 or EH301 energy storage systems, in which the voltage across the capacitor reaches a maximum value of 3.6 V [36] or 5.2 V [37]. Tables 9 and 10 An analysis of the capacitor-charging dynamics for individual connections indicates that the delta connection produced the highest capacitor-charging power, regardless of the value of the capacitor capacity, the external load of the shaft, or its rotational speed (Figure 10).…”

“…Many researchers use the commercial EH300 or EH301 energy storage systems, in which the voltage across the capacitor reaches a maximum value of 3.6 V [36] or 5.2 V [37]. Tables 9 and 10 Many researchers use the commercial EH300 or EH301 energy storage systems, in which the voltage across the capacitor reaches a maximum value of 3.6 V [36] or 5.2 V [37]. Tables 9 and 10 show the times to reach 3.6 V and 5.2 V across a capacitor in all 12 experiments.…”

Piezoelectric Transducer-Based Diagnostic System for Composite Structure Health Monitoring

“…Thus, structural health monitoring of composite structures with use of embedded piezoelectric sensors is of great significance in recent research of composites defects [ 24 , 25 , 26 , 27 , 28 , 29 ]. The piezo-based macro-fiber composite magnets were applied as the self-powered rotor vibration monitoring system in the active magnetic bearing application [ 30 ]. In this application, the piezo-transducers were used both as the energy harvesting and rotor vibration sensing.…”

Dual Piezoelectric Energy Investing and Harvesting Interface for High-Voltage Input

“…As energy generated by a single PZT could be insufficient to power wearable electronics, this work focuses on maximizing energy extraction from multiple PZTs. Fabrication and characterization of multiple vibration transducers-based systems have been done in some of the prior works [18][19][20]. However, they only utilize simple circuits with discrete components or commercially available harvesting circuits to evaluate harvesting performance and did not present any optimized integrated circuit design for multiple transducers.…”