Abstract: The present invention relates to composite paperboard containers and methods for making the same. Specifically, the present invention includes a curvilinear container comprising a tubular body formed convolutely or via spiral winding from a single paperboard ply or multiple plies as commonly known in the art. The tubular body includes opposing ends that can be sealed by paperboard, metallic, plastic, or membrane-type end closures so as to preserve the consumable products typically enclosed by the container. The curvilinear container includes a tubular body having a curvilinear portion wherein the diameter of the tubular body varies along the length of the curvilinear portion. A plurality of radially projecting ribs are distributed about the circumference of the curvilinear portion as collection areas for excess tube wall material and thereby accommodate reduction of the tube wall diameter within the curvilinear portion.

Abstract: A power delivery system, and a method for operating it includes a plurality of power cells that are electrically connected to a multi-winding machine comprising one or more primary windings and a plurality of secondary windings such that each cell is electrically connected to one of the secondary windings and a plurality of the secondary windings are phase-shifted with respect to the primary windings. The method includes determining, for each cell in a set of the power cells, a carrier offset angle, and synchronizing, by the each cell in the set, a carrier signal to the secondary voltage for the cell based on the carrier offset angle determined for the cell. The carrier signal for each cell controls the timing of operation of switching devices within the cell.

Abstract: A variable frequency drive including a plurality of power cells that are configured as three phases of series-connected cells to deliver power to a load. The drive is operated to increase the output voltage of each power cell using overmodulation.

Abstract: An electrical device includes a plurality of single-phase power cells electrically connected to receive power from a source and deliver power to a load. The single-phase power cells include a first rank of regenerative power cells and a second rank of non-regenerative power cells. Each non-regenerative power cell may include an inverter bridge, a capacitor set electrically connected across terminals of the inverter bridge, and a three-phase bridge rectifier electrically connected across the terminals. The non-regenerative power cells may provide reactive power when the plurality of cells are used for braking of a motor.

Abstract: The present invention relates to composite paperboard containers and methods for making the same. Specifically, the present invention includes a curvilinear container comprising a tubular body formed convolutely or via spiral winding from a single paperboard ply or multiple plies as commonly known in the art. The tubular body includes opposing ends that can be sealed by paperboard, metallic, plastic, or membrane-type end closures so as to preserve the consumable products typically enclosed by the container. The curvilinear container includes a tubular body having a curvilinear portion wherein the diameter of the tubular body varies along the length of the curvilinear portion. A plurality of radially projecting ribs are distributed about the circumference of the curvilinear portion as collection areas for excess tube wall material and thereby accommodate reduction of the tube wall diameter within the curvilinear portion.

Abstract: An electric drive apparatus and method for controlling AC motors wherein the motor output is a function of the AC input power to the electric drive. Means are provided for detecting the voltage being supplied by the source of AC power to a drive circuit, and for controlling the output to the multi-phase AC load based on the detected power level. A controller monitors the motor voltage, current, and speed or frequency while also receiving a command for torque or torque-producing current. The method provides for the operation of the drive circuit in the event of either a partial or complete loss of AC input power. During such an occurrence, the controller will cause the circuit to generate sufficient negative torque to cause a power flow from the motor to the drive circuit to substantially equal the inherent losses in the drive and motor to avoid loss of energy from the DC filter of the drive circuit. Motor torque and speed can be quickly restored when the input power is re-established.

Abstract: A set of positioning guide members are mounted on a worktable to delimit receiving areas for a workpiece support plate so that the support plate may be accurately positioned at each workstation on the table to allow accurate machining to be effected; a locking device is provided at each workstation to lock the support plate in a selected position in alignment with a tool at each workstation.