A stationary induction apparatus includes a plurality of stationary device structures, each including: a stationary induction device including a core that has a plurality of magnetic legs and yokes connecting both ends of the plurality of magnetic legs, and windings that are respectively wound around the plurality of magnetic legs of the core; and a pair of yoke supports that respectively extend along the yokes on both ends of the stationary induction device and individually support the respective yokes; and a pair of connecting support members to which both ends of the pairs of yoke supports are respectively fixed such that the plurality of stationary device structures are arranged parallel to one another to form airflow paths between the respective stationary induction device that are disposed adjacent to each other.

The invention comprises an apparatus, comprising: an inductor, comprising: an inductor core and a winding comprising a wound shape around the inductor core, where the winding comprises a first cross-sectional area at a first longitudinal position along the winding and a second cross-sectional area at a second longitudinal position along the winding, the second cross-sectional area at least twenty percent larger than the first cross-sectional area. Optionally and preferably, the winding includes a first set of cast elements sharing a first geometric shape and a second set of cast elements sharing a second geometric shape, where the alternating members of the first set of cast elements and the second set of cast elements are welded together to form the winding.

The invention comprises a method and apparatus for processing power, comprising the steps of: generating/using 3-phase power; feeding an AC drive with the 3-phase power, the AC drive generating a first output; and transforming the first output with a zigzag transformer, the zigzag transformer linked to at least one load output/load connector. The method and apparatus comprises an optional filter for filtering the 3-phase power prior to the step of transforming, the filter including a distributed gap core material.

Embodiments of the present invention relate to a wireless charging device. The wireless charging device includes a housing, an induction coil, a ferrite, a printed circuit board (PCB), and a fan. The housing includes a first surface and a second surface, a protrusion is disposed on the first surface, and the protrusion is configured to: support a to-be-charged device, and leave a gap between the to-be-charged device and the first surface when the to-be-charged device is installed on the wireless charging device. At least one first air guiding opening and at least one second air guiding opening are disposed on the housing. When the fan runs, the first air guiding opening, the fan, and the second air guiding opening form an air duct that passes through the ferrite and the PCB.

The invention comprises a harmonic filter apparatus and method of use thereof for magnetically isolating and filtering individual phases of three-phase power comprising a delta circuit that includes: (1) a first leg connecting to a second leg and a third leg and (2) first circuitry on the first leg matching second circuitry on the second leg, the first circuitry comprising at least two contactors electrically wired in parallel, the harmonic filter magnetically isolating individual phases of three-phase power, where inductor—coupled inductor pairs couple apexes of the delta circuit to individual phases of the three-phase power.

A transformer assembly includes an electric transformer, a temperature sensor system, and a computation unit for determining a thermal state of the electric transformer. The electric transformer includes a cooling device having at least one liquid coolant channel to absorb exhaust heat from the electric transformer, a heat spreader for transferring heat from the liquid coolant to a heat dissipation surface of the heat spreader, and an air blower configured to effect an airstream along the heat dissipation surface. The temperature sensor system includes an entering coolant sensor for providing an entering coolant temperature signal, a leaving coolant sensor for providing a leaving coolant temperature signal, an entering airstream sensor providing an entering airstream temperature signal, and a leaving airstream sensor providing a leaving airstream temperature signal. The computation unit is configured to determine a thermal state of the transformer.

Embodiments of the present invention relate to a wireless charging device. The wireless charging device includes a housing, an induction coil, a ferrite, a printed circuit board (PCB), and a fan. The housing includes a first surface and a second surface, a protrusion is disposed on the first surface, and the protrusion is configured to: support a to-be-charged device, and leave a gap between the to-be-charged device and the first surface when the to-be-charged device is installed on the wireless charging device. At least one first air guiding opening and at least one second air guiding opening are disposed on the housing. When the fan runs, the first air guiding opening, the fan, and the second air guiding opening form an air duct that passes through the ferrite and the PCB.

A resonance damping element for a power converter having a positive busbar and a negative busbar, wherein the resonance damping element comprises a magnetic core formed with two openings through which the positive busbar and the negative busbar of the power converter are to be routed, respectively.

A transformer cooling system, includes a dry transformer having a core including a leg, a winding body arranged around the leg, and a cooling channel extending in a direction of a longitudinal axis of the winding body. The cooling channel is disposed between an inner part of the winding body and an outer part of the winding body. The transformer cooling system further includes a housing for containing the dry transformer. The housing has an inlet portion for receiving air from outside the housing and an outlet portion for expelling air outside the housing. The transformer cooling system further includes a flow generating device arranged at the outlet portion and adapted to generate an under pressure for sucking the air from the inlet portion towards the flow generating device and to expel the air through the outlet portion outside the housing.

A medium conveying and heat exchange device and a vortex flow separator for an iron core of an electromagnetic device is provided. The vortex flow separator includes a jet pipe and a vortex flow separation pipe, the vortex flow separation pipe includes a vortex flow chamber, a cold end pipe section and a hot end pipe section. Compressed airflow flows through the jet pipe to form spiral airflow and flow into the vortex flow chamber in a tangential direction thereof. A valve having a cone-shaped surface is arranged inside the hot end pipe section, central airflow of the spiral airflow passes by the cone-shaped surface of the valve and flows back, and is cooled to become cold airflow, and then flows out from the cold end pipe section, to serve as cooling and drying airflow of the input electromagnetic device.