PL425303A1 - Device for recovery and conversion of mechanical energy from radial vibrations of a machine rotor or shaft into electrical energy - Google Patents

Abstract

The device in its structure contains piezoelectric fiber composites (MFC - Micro Fiber Composite), which, thanks to deformation, generate electric charges (simple piezoelectric phenomenon). The deformation of the MFC elements (4), which are attached to the hub (1) through flexible couplings (5), is caused without contact by the interaction of the rotor (2) vibrations and the configuration of the MFC elements (4) with permanent magnets. The device transfers the mechanical energy of the rotor's radial vibrations (2) to the MFC elements (4) through a magnetic coupling. In particular, two configurations of the arrangement of neodymium magnets are a feature of the device. The first one introduces the arrangement of neodymium magnets on the circumference of the rotor (2) and at the MFC elements (4). Here, the deformation of the MFC elements (4) takes place due to the forces of repulsion or attraction of the poles of neodymium magnets. The second one introduces the arrangement of neodymium magnets only at MFC elements (4). In this case, the deformation of the MFC elements (4) is caused by the attractive forces of the neodymium magnets. To enhance the impact of rotor vibrations on the deformation of MFC elements (4), neodymium magnets were used in two different Halbach arrays configurations. The functionality and efficiency of the device depend on the design, including the modular configuration of the MFC-rotor system, which is a characteristic feature of the above-mentioned device. The modular design of the device ensures its easy adaptation to various rotor diameters of machines thanks to the use of a split hub (1) and the possibility of adjusting the diameter d1, as well as adjusting the width of the air gap between the MFC elements and the rotor.