Abstract: In some aspects, a ground detection system may measure a difference from a tie point of the ungrounded electrical system and a ground point to determine if a grounded condition exists. The ground detection system may measure a plurality of signals at a plurality of distributed overload protection devices. The ground detection system may compare the plurality of signals from each of the plurality of distributed overload protection devices to stored threshold values. The ground detection system may determine a location of the grounded condition based at least in part on the comparing the plurality of signals from each of the plurality of distributed overload protection devices to the stored threshold values. In various embodiments, the location can be based on a length and an impedance of electrical circuit wiring. The ground detection system may display the location of the grounded condition on a display. Numerous other aspects are described.

Abstract: A retention structure can be created using two or more different materials (e.g., one magnetic material, and one non-magnetic material) as a composite structure. The retention structure can include a cylindrical hoop comprising one or more one or magnetic regions tangentially alternating with one or more non-magnetic regions configured to surround and retain a plurality of magnets to a rotor, wherein the one or more magnetic regions are aligned with each one of the plurality of magnets and the one or more non-magnetic regions are aligned with one or more spaces between the plurality of magnets on the rotor. The magnetic material allows flux from the permanent magnets to flow through to the stators and the non-magnetic sections reduce leakage of magnetic flux to adjoining permanent magnets through use of non-magnetic materials. The retention structure can be fabricated using a hot isostatic press process.

Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.

Abstract: A methods and systems for generating rectified signals are disclosed. For example, a system performing the methods includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current.

Abstract: A Z source network includes positive and negative input terminals and a first snubber circuit connected across the positive and negative input terminals. The first snubber circuit is configured to suppress voltage transients across the positive and negative input terminals. The Z source network also includes positive and negative output terminals and a second snubber circuit connected across the positive and negative output terminals. The second snubber circuit is configured to suppress voltage transients across the positive and negative output terminals.