An electromagnetic induction generator for use in applications where other energy sources are unavailable or undesired includes: a rotor having at least a pair of through holes in its body, the rotor body supporting two or more magnets; a stator including a plurality of conductive windings and a through hole; and a length of filament inserted through the through holes of the rotor and stator, the filament supporting the rotor during use.

Voltage is induced by causing relative rotation between the stator and rotor to create an electrical current that can be stored in an electricity storage unit. During use the stator is held stationary, for example by a mounting member. The rotor is rotated by winding the filament upon itself and then unwinding the filament by applying an input force on either end to induce rotation of the rotor in a manner similar to a traditional button spinner toy.

A pedal for bicycles comprising a pedal pin and a pedal body coupled in a freely rotatable manner on the pedal pin. An internal chamber obtained in the pedal pin has an internal surface extending along a reference axis approximately coaxial with the same. The pedal further comprises an electronic measurement system provided with deformation sensors configured to detect electric parameters indicative of the mechanical deformation of the pedal pin, an electronic circuit configured to determine, based on the electric parameters, the mechanical deformation of the pedal pin, and an electric generator which generates electrical power based on the rotation of the pedal body and is arranged in the internal chamber of the pedal pin.

A human motion energy harvesting apparatus embeddable in a wearable electronic device is provided. The apparatus may include a base; a first rotor disposed in a ring shape and connected to the base, the first rotor being rotatable circumferentially relative to the base, wherein a plurality of pairs of first permanent magnets may be disposed on a surface of the first rotor; an oscillating weight fixed coaxially with the first rotor; a second rotor disposed in a ring shape and coaxially connected to the base with the first rotor, the second rotor being rotatable circumferentially relative to the base, wherein a plurality of pairs of second permanent magnets may be disposed on a surface of the second rotor; a modulation ring fixed to the base coaxially with the first rotor between the first rotor and the second rotor; and a stator fixed to the base coaxially with the first rotor on a side of the second rotor opposite the first rotor, wherein a coil is arranged on the stator.

A hub for a human-powered vehicle is provided that comprises a hub axle, a hub body, an electric power generator, and a communication device. The hub body is rotatably mounted on the hub axle about a rotational axis. The electric power generator is provided between the hub axle and the hub body. The electric power generator is configured to generate electric power by relative rotation between hub axle and the hub body. The communication device is located at least partly outside of the hub body. The communication device includes a wireless communicator configured to wirelessly communicate with an additional wireless communicator.

Simple to manufacture electric generators or motors and methods of manufacturing such are disclosed. Such devices are preferably manufactured from 2-dimensionally cut, flat stock materiel. The generator or motor has two large diameter rotors to enable, for example, useful generation of electricity at low revolutions per minute. The frame of the device includes side walls with castellated stators on the periphery of the walls. Castellated end plates removeably interlock with the stators. The rotors drive magnets past the stators in the frame of the device. In preferred embodiments, rotors are driven by human legs or arms, low speed wind, or water with low or zero water drop distance.

A human-powered generator includes a frame and a pedal crankset and crankset sprocket rotatably mounted on the frame, a flywheel rotatably mounted on the frame including a flywheel-crankset sprocket a flywheel-countershaft sprocket, a countershaft rotatably mounted on the frame including a countershaft-flywheel sprocket and a countershaft-alternator sprocket, and an alternator including an alternator drive shaft and an alternator sprocket. The human-powered generator also includes a crankset-flywheel drive chain, a flywheel-countershaft drive chain, and a countershaft-alternator drive chain. A pedaling cadence at the pedal crankset of between approximately 60 RPM and approximately 100 RPM achieves an alternator drive shaft RPM of between approximately 2,000 RPM and approximately 5,000 RPM.

An apparatus may generate energy in response to a vehicle wheel rotation. The apparatus may include a roller, a shaft, and a generator. The roller may rotate in response to a movement or motion of the wheel and may apply a friction to the wheel to decrease a rotational velocity of the wheel. The shaft may rotate in response to a rotation of the roller. The generator may generate an electrical output based on rotation of the shaft and convey the electrical output to an energy storage device or to a motor of the vehicle.

A system is provided for generating electrical energy from passage of a vehicle over a road surface. The system comprises a pressure receiver connected to a rotatable shaft associated with a primary transmission unit. The pressure receiver is adapted for swinging motion over the road surface, so that upon pressure being applied to the pressure receiver by the moving vehicle the receiver swings in the direction of vehicle movement, wherein kinetic energy of vehicle motion is transferred to the shaft resulted in its rotation causing operation of a primary energy transmission unit consisting of the driving sprocket and a driven sprocket-follower wheel assembly which is coupled by a leading transmission arrangement an electrical generator.

An apparatus may generate energy in response to a vehicle wheel rotation. The apparatus may include a roller, a shaft, and a generator. The roller may rotate in response to a movement or motion of the wheel and may apply a friction to the wheel to decrease a rotational velocity of the wheel. The shaft may rotate in response to a rotation of the roller. The generator may generate an electrical output based on rotation of the shaft and convey the electrical output to an energy storage device or to a motor of the vehicle.

A portable apparatus for generating electricity is provided comprising an electrical energy-generating device for generating electrical energy in response to input mechanical action. The apparatus comprises a drive mechanism having an elongate flexible member provided as a closed endless loop. A portion of the elongate flexible member is exposed so as to enable a user to grasp and pull said portion downward by a distance of at least 30 cm. The drive mechanism supplies the said mechanical action to the electricity-generating device, wherein said mechanical action is provided by user applying a downward force to the elongate flexible member so as to cause the elongate flexible member to move with respect to the mounting element. A re-chargeable battery is further provided for storing the electrical energy generated by the electrical energy-generating device. A mounting element enables the apparatus to be supported at a suspended position relative to the ground during use.