Providing electric power distribution for fracturing operations comprising receiving, at a transport, electric power from a mobile source of electricity at a first voltage level and supplying, from the transport, the electric power to a fracturing pump transport at the first voltage level using only a first, single cable connection. The first voltage level falls within a range of 1,000 V to 35 kilovolts. The transport also supplies electric power to a second transport at the first voltage level using only a second, single cable connection.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.

A linear generator includes one or more helices, and one or more magnet members movable relative to a first helix to generate electric energy within the first helix. The first helix includes a first coil. The first helix and/or the magnet members have a density less than that of water such that the first helix and/or the magnet members have buoyant properties when the linear generator is at least partially submerged in the water.

A smart ring is configured harvest mechanical energy using piezoelectricity. The smart ring includes a ring-shaped housing, a power source disposed within the ring-shaped housing, and a charging circuit. The charging circuit includes a piezoelectric harvesting element, and is configured to charge the power source when user motion causes a mechanical deformation in the piezoelectric harvesting element. The smart ring further includes a component, disposed within the ring-shaped housing and configured to draw energy from the power source, and further configured to perform at least one of: i) sense a physical phenomenon external to the ring-shaped housing, ii) send communication signals to a communication device external to the ring-shaped housing, or iii) implement a user interface.

An axial flux rotary generator comprising: two magnetic annuli; a coil annulus; the magnetic annuli and coil annulus having a common axis; the two magnetic annuli defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli and the coil annulus having a sequence of coils attached around the common axis in the gap such that lines of magnetic flux from the magnetic fields cut the turns of the coils and thus induce electric current in the coils as the magnetic annuli are caused to rotate relative to the coil annulus; wherein a relative positioning of individual magnetic fields and a relative positioning of centers and sizing of individual coils in the sequence of coils is such that (i) the electric currents in the individual coils of the sequence of coils are in excess of three phases relative to one another, and (ii) the number of common factors other than one between the number of coils in the sequence of coils and the number of individual magnetic fields around the common axis is one or zero.

A high voltage DC electric power generating system includes a poly-phase permanent magnet generator having at least one control winding and a plurality of power windings. Each of the power windings is a phase of the poly-phase permanent magnet generator. A passive rectifier connects a switch to an input of each of the power windings such that the switch is a neutral node in a closed state and a disconnect in an open state.

A high voltage DC electric power generating system includes a poly-phase permanent magnet generator having at least one control winding and a plurality of power windings. Each of the power windings is a phase of the poly-phase permanent magnet generator. A passive rectifier connects a switch to an input of each of the power windings such that the switch is a neutral node in a closed state and a disconnect in an open state.

Improved apparatuses and methods of returning magnetic energy of a motor to the motor system. Improved battery systems and configurations are disclosed to enhance recovery of magnetic energy of a motor, to enhance motor efficiency. A power source has a first pole and a second pole. A phase coil is configured to receive electrical energy from the power source to form a magnetic field for imparting motion to a rotor. A battery has a first pole and a second pole, the first pole of the battery configured to receive energy of the magnetic field of the phase coil, the second pole of the battery being coupled to the first pole of the power source and having a polarity that is opposite a polarity of the first pole of the power source.

Improved apparatuses and methods of returning magnetic energy of a motor to the motor system. Improved battery systems and configurations are disclosed to enhance recovery of magnetic energy of a motor, to enhance motor efficiency. A power source has a first pole and a second pole. A phase coil is configured to receive electrical energy from the power source to form a magnetic field for imparting motion to a rotor. A battery has a first pole and a second pole, the first pole of the battery configured to receive energy of the magnetic field of the phase coil, the second pole of the battery being coupled to the first pole of the power source and having a polarity that is opposite a polarity of the first pole of the power source.

An electric generator assembly for an aircraft is provided. The electric generator assembly includes: a main generator having a main rotor and a main stator, the main stator includes a first three-phase winding and a second three-phase winding, the first and second three-phase windings each configured to have a voltage induced therein by the main rotor, the first three-phase winding defining a phase shift from the second three-phase winding greater than zero degrees.