Waleed Said Phones & Addresses
-
5282 Solitude Dr, Rockford, IL 61114 (815) 633-7519
-
Chicago, IL
Publications
Us Patents
Power Conversion Architecture With Zero Common Mode Voltage
View pageUS Patent:
7952896, May 31, 2011
Filed:
Aug 20, 2008
Appl. No.:
12/229124
Inventors:
Jun Hu - Rockford IL, US
Vietson M. Nguyen - Rockford IL, US
Waleed M. Said - Rockford IL, US
Vietson M. Nguyen - Rockford IL, US
Waleed M. Said - Rockford IL, US
Assignee:
Hamilton Sundstrand Corporation - Rockford IL
International Classification:
H02M 5/452
H02M 1/12
H02M 1/12
US Classification:
363 37, 363 39
Abstract:
A controller for a power conversion system reduces common-mode voltage generated by the power conversion system by imposing a constraint on the control signals applied to the power conversion system. The power conversion system includes a plurality of switching devices that are responsive to control signals provided by the controller to selectively connect each output of the power conversion system to one of a plurality of inputs. The controller generates control signals based on a desired output of the power conversion system. In addition, the controller imposes a constraint on the control signals to reduce the common-mode voltage. The constraint is defined by assigning an integer value to each input of the power conversion system, and requiring that the selective connection of outputs to inputs must result in a sum of integer values equal to zero.
Control Of Pole-Change Induction Motors
View pageUS Patent:
8294409, Oct 23, 2012
Filed:
Aug 18, 2010
Appl. No.:
12/858764
Inventors:
Waleed Said - Rockford IL, US
Huazhen Chai - Caledonia IL, US
Huazhen Chai - Caledonia IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H02P 1/38
US Classification:
318773, 318727, 318779, 318799, 180 6531, 123566
Abstract:
A ram air fan control system includes a ram air fan motor, the ram air fan motor being a pole-change induction motor with at least two pole-count configurations, a ram air fan contactor in operative communication with a first pole-count configuration of the ram air fan motor over a ram air fan conductor bus, a ram air fan power controller in operative communication with the ram air fan contactor, a common contactor in operative communication a second pole-count configuration of the ram air fan motor over a common conductor bus, the common conductor bus being separate and electrically isolated from the ram air fan conductor bus, and a common power controller in operative communication with the common contactor.
Multi-Level Parallel Phase Converter
View pageUS Patent:
8374009, Feb 12, 2013
Filed:
Mar 25, 2010
Appl. No.:
12/731280
Inventors:
Frank Z. Feng - Loves Park IL, US
Waleed M. Said - Rockford IL, US
Waleed M. Said - Rockford IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H02M 7/00
US Classification:
363 65
Abstract:
A multi-level parallel phase power converter has a power source, a converter, and an electrical node. The converter includes multiple converter modules. Each of the converter modules has multiple multi-level power converters, a poly-phase interphase inductor, and a set of poly-phase power summing connections. The summed power of each of the multiple converter modules are connected together to form a single poly-phase power converter.
Active Rectification For A Variable-Frequency Synchronous Generator
View pageUS Patent:
8378644, Feb 19, 2013
Filed:
Aug 28, 2009
Appl. No.:
12/549466
Inventors:
Waleed M. Said - Rockford IL, US
Si Jian Fang - Carpentersville IL, US
Si Jian Fang - Carpentersville IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H02P 11/00
H02P 9/00
H02P 9/00
US Classification:
322 44, 322 24
Abstract:
An active rectifier controller decouples measurements of the phase and speed of a variable frequency synchronous generator from measurements of the AC output voltage. The active rectifier controller receives position information representative of the rotor position of the VFSG independent of a load connected to the VFSG that is used to determine the phase position and speed of the VFSG. Based on measurements of the generator speed and phase, the active rectifier controller controls the active rectifier to draw AC currents in-phase with the back-electromotive force (BEMF) voltage of the VFSG.
Cooling And Controlling Electronics
View pageUS Patent:
8531822, Sep 10, 2013
Filed:
Jul 29, 2011
Appl. No.:
13/193743
Inventors:
Waleed M. Said - Rockford IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H05K 7/20
US Classification:
361677, 361699
Abstract:
A power electronics rack includes a switching chamber provided with one or more plate heat exchangers to receive a cooling fluid. A contactor chamber has contactors for connecting switches in the switching chamber to a magnetics chamber. The magnetics chamber receives at least one of a filter, an inductor or a transformer. The magnetics chamber receives cooling fluid which directly contacts the at least one of a filter, an inductor and a transformer for cooling. A common cooling circuit delivers cooling fluid to both the switching and magnetics chambers. The contactors may be reconfigured under certain conditions.
Gradually Reducing Resistive Clamp
View pageUS Patent:
8553381, Oct 8, 2013
Filed:
May 27, 2011
Appl. No.:
13/117181
Inventors:
Vietson M. Nguyen - Rockford IL, US
John D. Sagona - Poplar Grove IL, US
Waleed M. Said - Rockford IL, US
John D. Sagona - Poplar Grove IL, US
Waleed M. Said - Rockford IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H02H 9/00
H02H 3/20
H02H 9/04
H02H 3/22
H02H 3/20
H02H 9/04
H02H 3/22
US Classification:
361 56, 361 911, 361111
Abstract:
A voltage spike protection system minimizes a voltage spike by connecting a resistive clamp to a power source when the voltage spike is detected. The voltage spike detection system disconnects the resistive clamp after a portion of the voltage spike is dissipated.
Active Ac Inrush Current Control
View pageUS Patent:
8630078, Jan 14, 2014
Filed:
Jul 29, 2010
Appl. No.:
12/845967
Inventors:
Huazhen Chai - Caledonia IL, US
Waleed Said - Rockford IL, US
Waleed Said - Rockford IL, US
Assignee:
Hamilton Sundstrand Corporation - Windsor Locks CT
International Classification:
H02H 9/02
US Classification:
361 939, 361 58, 361 63
Abstract:
Active inrush current control includes activating a load, the activating causing inrush current to flow, switching a semiconductor switching device to a current limiting state in response to the inrush current flow, the current limiting state being one of at least three states of the semiconductor switching device and the current limiting state dissipating the inrush current, and switching the semiconductor device to a full current flow state in response to the dissipating, the full current flow state not inhibiting current flow.
No Break Power Transfer For Power Generating System
View pageUS Patent:
20120139354, Jun 7, 2012
Filed:
Dec 6, 2010
Appl. No.:
12/961048
Inventors:
Waleed M. Said - Rockford IL, US
Assignee:
HAMILTON SUNDSTRAND CORPORATION - Windsor Locks CT
International Classification:
H02J 3/08
US Classification:
307 84
Abstract:
A method for no break power transfer in a variable frequency power generating system, the power generating system comprising a first bus connected to a first generator and a second bus connected to a second generator includes configuring a power transfer device to output power that is synchronized to match a voltage and a frequency of the second bus to the second bus; reconfiguring the power transfer device to output power that is synchronized to match a voltage and a frequency of the first bus to the second bus; and closing a tie switch located between the first bus and the second bus.