Siemens Aktiengesellschaft

Siemens Industry, Inc.

Siemens Energy & Automation, Inc.

Innomotics Gmbh

Robicon Corporation

Richard H Osman

Mukul Rastogi

Peter W Hammond

Marc Francis Aiello

Stefan Von Dosky

John Channing Bousfield, Iii

Bogdan Cristian Ionescu

Herbert Schorb

Yusuke Fukuta

Bernd Köhler

Kinjal Patel

Peter Willard Hammond

Marc F Aiello

John Channing Bousfield Iii

Provided are embodiments for a system for reducing input harmonic distortion of a power supply. The system includes a power source coupled to a power supply. The power supply includes an input stage that is configured to receive an input signal from the power-supply, wherein the input signal is received at known input frequency, and a converting stage that is operated to convert the input signal to an output signal, wherein the output signal has an output frequency. The power supply also includes an output stage that is operated to generate output power based on the output signal, and a controller that is configured to provide control signals to the output stage of the power supply to modify the output signal. Also provided are embodiments for a power supply and method for reducing input harmonic distortion of the power supply.

Reducing input harmonic distortion in a power supply

A system () for controlling a linear alternating current (AC) electrodynamic machine () includes a linear AC electrodynamic machine () with a stationary part () with a plurality of discrete stationary sections (), each stationary section () having a poly-phase circuit; a variable frequency drive (VFD) () configured to be coupled to a utility power source and to provide output currents, wherein the VFD () is operable coupled to the stationary part () of the linear AC electrodynamic machine () for powering and controlling the stationary sections () of the stationary part (); and a plurality of switches () coupled between the VFD () and the stationary part (), wherein the plurality of switches () allow connecting or disconnecting the VFD () to or from the stationary sections ().

System and method for controlling a linear motor having multiple sections with a single variable frequency drive

Systems and method for controlling an alternating current (AC) electrodynamic machine () with a variable frequency drive (VFD) () include a control system () with a phase-locked-loop (PLL) circuit () for providing a stator flux angle signal () to the VFD (), the PLL circuit () comprising a proportional integral (PI) regulator () providing an output signal (); and a feedforward generator () in communication with the PLL circuit (), wherein the feedforward generator () tracks a stator flux position of the AC electrodynamic machine () such that the feedforward generator () determines a stator frequency signal () based on stator flux signals () and supplies the stator frequency signal () downstream of the PI regulator (), and wherein the stator frequency signal () is summed with the output signal () of the PI regulator () to provide a dynamically adapted output signal () of the PI regulator (), and wherein the adapted output signal () is used to determine the stator flux angle signal ().

Systems and method for controlling electrodynamic machines with a variable frequency drive

A system for soft starting a large AC motor may include a variable frequency drive (VFD) having a much lower voltage rating than the rated voltage of the AC motor. The VFD's voltage rating may be in a range of about 33% to about 67% of the AC motor's rated voltage. The AC motor may be coupled to a utility power source via conventional connections to leads of the AC motor's windings. The VFD may be connected to the AC motor via tapped connections within the windings of the AC motor such that the tap voltages are much less than the AC motor's rated voltage. A less expensive VFD may therefore be used to soft start the AC motor instead of a VFD having the same rated voltage as the AC motor. Methods of starting large AC motors with a VFD are also provided, as are other aspects.

Systems, apparatus, and methods for soft starting large AC motors with a variable frequency drive

A power electronic device is disclosed. The power electronic device may include a housing, a conductive element positioned within the housing and rated for at least a medium voltage, a cooling system in fluid communication with the conductive element, a plurality of temperature sensing tags and a data collection unit having a receiver that is configured to receive signals from the antennae of the temperature sensing tags. The cooling system may have a plurality of outlet conduit elements that are positioned within the housing. Each of the tags may be attached to one of the outlet conduits and may include a power supply, a temperature sensor, and an antenna.

Temperature sensing system for power electronic device

A system for braking a motor. The system includes at least one resistor and a contactor connected to the at least one resistor and a motor. The system further includes a variable frequency drive electrically connected to the motor, wherein the variable frequency drive comprises a controller operably connected to the contactor, wherein at least a portion of the contactor closes connecting the at least one resistor to the motor in response to a command from the controller. The variable frequency drive is configured such that motor flux levels may be maintained at a relatively high level as motor torque current is reduced, resulting in a consistently high motor flux level as the motor speed decreases.

Method for braking an AC motor

A starting method and system for a motor where the motor may be started as an induction motor by applying a magnetizing current to build flux through the stator, with the field current set at the maximum permissible exciter stator current (i.e., the current that will cause rated no-load current in the main field at the transition speed). The motor stator currents will be maintained at a value that allows the motor to generate sufficient breakaway torque to overcome any stiction. At a specific transition speed or after a period of time, the drive will initiate a transition from induction motor control to synchronous motor control by removing the initial magnetizing current, and a field current is then applied to the motor through the DC exciter. Once this transition is completed, the drive may ramp up to the desired speed demand.

Method of starting a synchronous motor with a brushless DC exciter

A three-phase, multi-winding includes a core, the core including a hub and an outer shell around a perimeter of the hub. wherein the hub and the outer shell are in a fixed position with respect to each other. The core also includes multiple slots. In addition to the core, the multi-winding device includes a primary winding positioned in at least two of the slots; and multiple spatially distributed secondary windings, wherein at least one of the secondary windings is positioned proximate the primary winding in at least one of the two slots.

Three-phase multi-winding device

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.

Variable-frequency drive with regeneration capability

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.

System and method for reducing harmonic effects on a power delivery system

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.

Inverter operation with over-modulation

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.

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Pittsburgh, PA, United States of America

Richard H Osman