RICHARD H OSMAN
Engineers in Pittsburgh, PA

2013033, Dec 19, 2013

Jun 12, 2013

13/915815

Richard H. Osman - Pittsburgh PA, US

SIEMENS INDUSTRY, INC. - Alpharetta GA

H02P 1/02

318503

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.

7977910, Jul 12, 2011

Apr 18, 2008

12/105766

Richard H. Osman - Pittsburgh PA, US
Kinjal Patel - Monroeville PA, US
Mukul Rastogi - Murrysville PA, US

Siemens Industry, Inc. - Alpharetta GA

H02P 23/00, H02P 25/00, H02P 1/50

318716, 318712, 318718, 318721, 318268, 318270, 322 10, 322 29, 322 89

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.

7428158, Sep 23, 2008

Sep 11, 2006

11/518979

Richard H. Osman - Pittsburgh PA, US

Siemens Energy & Automation, Inc. - Alpharetta GA

H02M 5/458, H02M 1/12

363 65, 363 39

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.

6313600, Nov 6, 2001

Feb 29, 2000

9/515442

Peter W. Hammond - Greensburg PA
Richard Osman - Pittsburgh PA

Robicon Corporation - New Kensington PA

H02P 528

318798

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.

2014000, Jan 2, 2014

Jun 27, 2013

13/928477

Bogdan Ionescu - McMurray PA, US
Peter Willard Hammond - Greensburg PA, US
Richard H. Osman - Pittsburgh PA, US

SIEMENS INDUSTRY, INC. - Alpharetta GA

H01H 71/00

335 18

An electrical contact apparatus is disclosed. The contact apparatus has first contact member having a first contact, a movable contact member received adjacent to the first contact member, the movable contact member having an opposing contact positioned adjacent the first contact, and an armature operable to produce an electromagnetic closing force to cause the movable contact member to remain closed upon application of current through the first contact member, movable contact member. Contact assemblies and methods of operating the contact apparatus are disclosed, as are other aspects.

8134316, Mar 13, 2012

Feb 20, 2009

12/389935

Richard H. Osman - Pittsburgh PA, US
Mukul Rastogi - Monroeville PA, US

Siemens Industry, Inc. - Alpharetta GA

H02P 3/12

318381, 318375, 318269, 31840002

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.

7948340, May 24, 2011

Aug 28, 2008

12/200377

Mukul Rastogi - Murrysville PA, US
Richard H. Osman - Pittsburgh PA, US
Peter Willard Hammond - Greensburg PA, US
Marc F. Aiello - Oakmont PA, US

Siemens Industry, Inc. - Alpharetta GA

H01F 30/12, H01F 27/02, H01F 21/02, H01F 27/28, H01F 27/24, H01F 7/06

336 5, 336 83, 336145, 336170, 336221, 336222, 296021, 29605

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.

7508147, Mar 24, 2009

May 18, 2006

11/419064

Mukul Rastogi - Murrysville PA, US
Richard H. Osman - Pittsburgh PA, US
Yusuke Fukuta - Pittsburgh PA, US

Siemens Energy & Automation, Inc. - Alpharetta GA

H02P 3/14

318376, 318759, 318801

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.

7307400, Dec 11, 2007

May 26, 2006

11/420578

Mukul Rastogi - Murrysville PA, US
Marc F. Aiello - Oakmont PA, US
Richard H. Osman - Pittsburgh PA, US

Siemens Energy & Automation, Inc. - Alpharetta GA

H02P 27/04, H02P 7/622, H02M 1/12

318801, 318807, 363 43

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.