Electromagnetic friction composite generator for collecting mechanical energy in any direction in the plane
Friction energy harvesters and electromagnetic energy harvesters have a wide range of applications in vibration mechanical energy collection due to their respective material advantages and output characteristics. However, the vibrations in life are characterized by random disorder and variable direction. The mechanical energy in a certain direction will greatly reduce the efficiency of the device when it vibrates in other directions. Therefore, develop a vibration mechanical energy that can effectively collect multiple directions. Energy harvesters are important in building self-powered systems.
Recently, Professor Zhang Haixia from the Institute of Micro-Nano Electronics, School of Information Science and Technology, Peking University, proposed an electromagnetic friction composite energy harvester that can collect vibrational mechanical energy in any direction in the plane. The composite energy harvester uses a spring-mounted suspension magnet as a slider, and uses a FPCB process to fabricate a film-type friction generator electrode and an electromagnetic coil having an eight-valve structure, wherein any two opposing electrodes constitute a friction of a freestanding structure. The generator, therefore, allows the electromagnetic and friction signal output to be generated simultaneously when the device slides in any direction, improving the utilization efficiency of the mechanical energy. In addition, the spring and the magnet form an in-plane resonant system that allows the device to effectively generate an electrical signal output over a low frequency vibration range of 10 Hz. Thanks to the large output current of the electromagnetic generator and the high output voltage of the friction generator, the device can quickly charge the 20μF capacitor to 7V within 200s under the combined charging condition. By fixing the device to the human calf or bicycle wheel, the hybrid energy harvester can effectively collect the mechanical energy of the human body when running or braking the bicycle and light up 40 LEDs, so it can be used as energy for self-powered night running lights or bicycle brake lights. Acquisition device. In addition, by further analysis of the output signals on the four freestanding structure friction generators, the device can also be used as an active direction sensor to identify the direction of sinusoidal or pulsed vibrations in environmental monitoring, self-driven sensing systems and There are broad application prospects in the fields of human-computer interaction.
Aiming at the random disorder and variable direction of mechanical energy in life, the electromagnetic friction composite energy harvester capable of collecting mechanical energy in any direction in the plane is realized by using spring and magnet to form a resonant system. The resonance of the device is realized by reasonable structural design. When the frequency is reduced, the device effectively performs energy conversion at a low vibration frequency, and combines the output current of the electromagnetic hair electrode and the high output voltage of the friction generator, so that the charging capability of the device is greatly improved. In addition, thanks to the special electrode structure design of the friction power generation part, the device can recognize the pulse vibration in 8 directions, so it can be used as a self-driven vibration direction sensor, showing the environmental monitoring, self-driven sensing system, human-computer interaction. Great application potential in such fields.
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