35 results about "Electromagnetic energy harvester" patented technology

The invention belongs to the technical field of renewable energy and micro-miniature power generation, and in particular relates to a two-degree-of-freedom electromagnetic energy harvester that converts vibration and linear reciprocating motion into rotational motion. The device is characterized by at least comprising a base, a rotor, a Top cover, spring, wire rope, magnet, coil, radial bearing, ferromagnetic patch; the radial bearing is fixedly connected with the cylindrical shaft; the rotor is fixedly connected with the outer ring of the radial bearing; the two ends of the spring are respectively connected with the top cover It is fixedly connected with the base to support the top cover to move up and down; several groups of magnets are fixed on the rotor; two ferromagnetic patches are fixed on the outer cylindrical surface of the cylinder; when the external excitation acts on the top cover, the rope will drive the rotor to rotate , the magnets fixed on the rotor and the coils move relative to each other, and continuously output electric energy through the principle of electromagnetic induction; the energy harvester has the characteristics of large output power, wide operating frequency, not affected by the placement direction, and wide application range.

The invention relates to a miniature electromagnetic swing-type energy harvester, especially an energy harvester which employs mechanical swinging and electromagnetic induction principles, and belongs to the technical field of new energy and power generation. The interior of a housing is provided with a drive device, a supporting spring, an electromagnetic power generation device, an energy storage circuit, a switch, and an output interface. The drive device and the electromagnetic power generation device carry out transmission in a gear mode. The electromagnetic power generation device is connected with the switch and the energy storage circuit, and the energy storage circuit is connected with an output interface. The energy harvester employs the half-gear mechanical reciprocating rotation of the drive device and the magnetic induction line cutting motion of the power generation device for power generation. Compared with a conventional electromagnetic energy harvester, the energy harvester is more reliable and stable. Moreover, the energy harvester can make the most of the motion of a human body or the vibration of an environment, and enables the swinging kinetic energy to be converted into electric energy. The energy harvester employs a closed-type structure, avoids a housing seam needed for the replacement of a cell, and meets the requirements of application in a severe environment.

The invention discloses an electromagnetic MEMS vibration energy harvester and a preparation method thereof. After preparing grooves and respective inductance line layers on two substrates, the two substrates are combined so that the grooves are formed to accommodate The cavity of the moving permanent magnet enables the respective inductance lines to be connected in a bridging manner to form a spiral inductance. In the vibration environment, the vibration pickup structure of the electromagnetic energy harvester can move freely in the cavity, which is a non-resonant vibration pickup structure. Compared with the resonant vibration pickup structure in the traditional energy electromagnetic harvester, its motion The case is less affected by the frequency of environmental vibrations and can respond to environmental vibrations in different directions. No matter how the vibration frequency and vibration direction change, the energy harvester of the present invention can efficiently collect vibration energy and convert it into electrical energy, so it has high energy collection efficiency, and has the advantages of low manufacturing cost and good consistency.

The invention discloses an array type piezoelectric-electromagnetic energy harvester based on fluid excitation, which is used as a power generation device for directly collecting water energy; it consists of a casing, a piezoelectric vibrator, a rectangular magnet, a circular magnet, an electromagnetic coil, and a casing Composed of end cover, connecting rod, driving fan and fixed base plate; using water flow to drive the fan to drive it to rotate, thereby driving the base to rotate, the circle on the bottom surface of the stepped shaft is inscribed with the circle on the bottom surface of the base to form a crank linkage mechanism with the connecting rod When the circular magnet moves as a piston in the casing, the circular magnet will cut the magnetic induction line with the electromagnetic coil in the casing to generate electromagnetic power; when the circular magnet is close to the rectangular magnet, it will produce magnetic coupling to deform the piezoelectric vibrator. Charges are generated on its surface; piezoelectric-electromagnetic power generation mode is achieved; piezoelectric power generation and electromagnetic power generation are carried out simultaneously, and the voltage generated by energy capture can reach the maximum in a short time.

The invention belongs to the technical field of new energy and power generation, and in particular relates to a cable-driven rotary electromagnetic energy harvester, which can be used to collect mechanical energy such as vibration and swing in the environment and convert it into electrical energy. The device mainly includes: a central rotating shaft, a rotor, elastic cables and non-elastic cables; wherein, the central rotating shaft and the rotor are fixedly connected, and the elastic cables and non-elastic cables are respectively wound on the central rotating shaft with opposite winding directions; magnets can be embedded in the rotor and Interacting with the coil produces an induced current. The invention can be used to supply power to low-power electronic devices (such as micro sensors, small mobile devices, environmental monitoring networks, etc.), and can be placed in complex environments such as vibrating machinery with vibration sources, sea wave floats, and elastic floors. In addition, the invention has simple structure, easy processing, high output power and wide operating frequency range.

The invention provides a low-frequency vibration electromagnetic energy harvesting device. The device includes an energy collector housing, a cantilever beam elongated plate, a cantilever beam short plate, a collision mass block, a magnetic field generation piece and a multi-turn coil. The environment is vibrated so as to provide vibration excitation to the energy collector housing. The cantilever beam elongated plate and the cantilever beam short plate vibrate along with the vibration excitation. The collision mass block collides with the cantilever beam elongated plate at a preset position of the cantilever beam elongated plate, such that the cantilever beam elongated plate generates vibration at a frequency close to the inherent frequency of the cantilever beam elongated plate. The multi-turn coil and the cantilever beam elongated plate vibrate at the same frequency. When a magnetic induction line is cut, an electrical signal is generated. According to the invention, the electromagnetic energy collector can collect low-frequency vibration electromagnetic energy, and greatly increases low-frequency energy harvest bandwidth of an electromagnetic cantilever beam structure.

The invention discloses an energy harvester, comprising: an energy harvester shell, a coil with a preset number of turns wound on the outer wall of the energy harvester shell, an opening is arranged at the upper end of the energy harvester shell; a vibrating plate, The vibrating plate is provided with a vibrating part that responds to external vibrations. The vibrating plate covers the opening at the upper end of the energy harvester shell, and the vibrating plate is fixedly connected to the energy harvester shell; the magnet block is located inside the energy harvester shell, and the magnet block Connected with the vibrating plate; the first friction layer, the first friction layer is located at the lower end of the magnet block, and the first friction layer is fixedly connected with the magnet block; the second friction layer, the second friction layer is arranged on the inner bottom surface of the energy harvester housing Above, the second friction layer is arranged opposite to the first friction layer according to a preset collision distance. The two energy harvesting methods of friction and electromagnetic work at the same time, which improves the energy output density of the device and realizes efficient energy harvesting and output in a low-frequency vibration environment.

The invention discloses an energy collection circuit for a piezoelectric-electromagnetic composite energy harvester, relates to an energy collection circuit for an energy harvester, and belongs to the technical field of new energy and power generation. The invention includes an electromagnetic energy harvester energy collection circuit, a piezoelectric energy harvester energy collection circuit, and a charging circuit for realizing composite charging and preventing current backflow. The energy harvesting circuit of the electromagnetic energy harvester is used to increase the output voltage of the electromagnetic energy harvester and reduce the output current, thereby increasing the output power. The energy harvesting circuit of the piezoelectric energy harvester is used to reduce the output voltage of the piezoelectric energy harvester, increase the output current, and thereby increase the output power. The output voltage of the energy harvesting circuit of the electromagnetic energy harvester and the piezoelectric output of the energy harvesting circuit of the piezoelectric energy harvester match the charging voltage of the rechargeable battery. The invention can realize the conversion of alternating current into direct current and supply power to the load, that is, the piezoelectric-electromagnetic composite energy harvester can directly supply power to the load, thereby increasing the output power.

The invention belongs to the technical field of renewable energy sources and micro-miniature power generation, and particularly relates to a two-dimensional piezoelectric electromagnetic hybrid energyharvester which at least comprises piezoelectric cantilever beams, a magnet, a frame, a coil, a cylinder, a fixed clamp and a spring; wherein the piezoelectric cantilever beams comprise a first piezoelectric cantilever beam and a second piezoelectric cantilever beam, the fixed ends of the piezoelectric cantilever beams are fixedly connected with the vertical wall of the frame, and the free ends of the piezoelectric cantilever beams are fixedly connected with the magnet; the piezoelectric cantilever beams and the magnet form a piezoelectric energy harvester; the coil is formed by winding an enameled wire along the right half part of the outer wall of the cylinder; the cylinder is fixedly connected with the vertical wall of the frame; and the fixed clamp, the magnet, the spring and the coilform an electromagnetic energy harvester. The two-dimensional piezoelectric electromagnetic hybrid energy harvester is simple and compact in structure. Vibration energy can be collected from two orthogonal directions, and the energy collection efficiency is high.