A generator includes a sliding member, a first power generation element and a second power generation element. The sliding member is made of a biomass-containing material. The first power generation element is configured to slide with respect to the sliding member. The second power generation element is configured to generate electrical power by variation of its relative position with respect to the first power generation element.

A system for converting an input oscillation having an input frequency into an output oscillation having an output frequency is disclosed. The system comprises: a controller configured for receiving the input oscillation and responsively generating a multi-component drive signal. A frequency of at least one component of the drive signal is other than two times the input frequency. In some embodiments, a frequency of another component of the drive signal equals about two times the output frequency. The system also comprises n oscillator for generating pump oscillations responsively to the drive signal and applying parametric excitation to the input oscillation at the pump oscillations.

An oscillator typically includes several rotatable drive magnets and pivotable oscillating arms having respective follower magnets so that the drive magnets drive movement of the follower magnets to pivot the arms back and forth in an oscillating manner. A generating magnet or electrically conductive member may be mounted on each oscillating arm for producing an electric current in the electrically conductive member. Repelling magnets may be mounted on the oscillating arms with respective repelling magnets positioned to repel the first repelling magnet to limit pivotal travel of the oscillating arm.

An oscillator typically includes several rotatable drive magnets and pivotable oscillating arms having respective follower magnets so that the drive magnets drive movement of the follower magnets to pivot the arms back and forth in an oscillating manner. A generating magnet or electrically conductive member may be mounted on each oscillating arm for producing an electric current in the electrically conductive member. Repelling magnets may be mounted on the oscillating arms with respective repelling magnets positioned to repel the first repelling magnet to limit pivotal travel of the oscillating arm.

A vibrating motor is provided in the present disclosure. The vibrating motor includes a shell, a base covered by the shell for forming an accommodating space, a vibrating system accommodated in the accommodating space, and a pair of elastic connectors connected to two opposite ends of the vibrating system respectively for elastically suspending the vibrating system in the accommodating space. Each elastic connector includes a first elastic member and a second elastic member for connecting a corresponding end of the vibrating system to the shell; the first elastic member includes a first elastic arm, and the second elastic member includes a second elastic arm crossing over and interesting with the first elastic arm.

An electromechanical transducer apparatus is disclosed and includes a housing. A static portion is substantially immobilized within the housing and includes a magnetic flux generator for generating magnetic flux, a pair of pole pieces for coupling magnetic flux through at least one of a first magnetic circuit and a second magnetic circuit, and a coil disposed to electromagnetically interact with one of the magnetic circuits. The static portion is thermally coupled to the housing via a low thermal resistance path to permit removal of heat. A movable portion includes first and second closing pieces separated from the pole pieces by first and second gaps. The closing pieces are mechanically coupled and supported for reciprocating motion about an equilibrium position which varies the gaps to cause a variation in magnetic reluctance in each of the first and second magnetic circuits.

According to an aspect of the present invention, there is provided A poly-generation system comprising: at least one cylinder which forms a combustion chamber; a piston provided in the cylinder and configured to reciprocate; an engine rotor which comprises an engine magnet and reciprocates in conjunction with the reciprocation of the piston; an engine stator which comprises an engine coil and outputs an electromotive force induced in the engine coil due to interference with the engine magnet to the outside; and a generator which is integrally coupled with the piston and generates electricity using an inertial force generated by the reciprocation of the piston, wherein the generator comprises: an elastic member deformed by the inertial force; a generator rotor which comprises a generator magnet and reciprocates due to the deformation of the elastic member; a generator stator which comprises a generator coil and outputs an electromotive force induced in the generator coil due to interference with the generator magnet, and a generator battery which stores the electromotive force induced in the generator coil.

According to an aspect of the present invention, there is provided A poly-generation system comprising: at least one cylinder which forms a combustion chamber; a piston provided in the cylinder and configured to reciprocate; an engine rotor which comprises an engine magnet and reciprocates in conjunction with the reciprocation of the piston; an engine stator which comprises an engine coil and outputs an electromotive force induced in the engine coil due to interference with the engine magnet to the outside; and a generator which is integrally coupled with the piston and generates electricity using an inertial force generated by the reciprocation of the piston, wherein the generator comprises: an elastic member deformed by the inertial force; a generator rotor which comprises a generator magnet and reciprocates due to the deformation of the elastic member; a generator stator which comprises a generator coil and outputs an electromotive force induced in the generator coil due to interference with the generator magnet, and a generator battery which stores the electromotive force induced in the generator coil.

A wave energy converter includes a surface float including a non-axisymmetric profile, a reaction plate configured to be submerged below a water surface, and more than one flexible tether, each mechanically coupled to both the surface float and the reaction plate, the reaction plate having a moment of inertia in pitch and roll greater than a moment of inertia in pitch and roll of the surface float.

A wave energy converter includes a surface float including a non-axisymmetric profile, a reaction plate configured to be submerged below a water surface, and more than one flexible tether, each mechanically coupled to both the surface float and the reaction plate, the reaction plate having a moment of inertia in pitch and roll greater than a moment of inertia in pitch and roll of the surface float.