Babak Fahimi

US Patent:

7392143, Jun 24, 2008

Filed:

Jul 24, 2006

Appl. No.:

11/491643

Inventors:

Ranjit Jayabalan - Danvers MA, US
Babak Fahimi - Arlington TX, US

Assignee:

The University of Texas System Board of Regents - Austin TX

International Classification:

G01R 21/00
G06F 17/18
G06F 11/30

US Classification:

702 60, 702179, 702185

Abstract:

As described herein is a vehicle, system, method and device for monitoring, detecting and diagnosis of one or more faults in single- or multi-converter power system. Through use of existing devices within the power system, particularly semiconductor devices, output parameters may be monitored for deviations from normal operation. In addition, faults may be detected and/or diagnosed within the failure withstand time of the existing device.

US Patent:

7663283, Feb 16, 2010

Filed:

Apr 18, 2006

Appl. No.:

11/379174

Inventors:

Mark T. Holtzapple - College Station TX, US
George A. Rabroker - College Station TX, US
Babak Fahimi - Arlington TX, US
Mehrdad Ehsani - College Station TX, US

Assignee:

The Texas A & M University System - College Station TX
StarRoter Corporation - College Station TX

International Classification:

H02K 17/42
H02K 19/20
H02K 19/24

US Classification:

310168

Abstract:

According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. The rotor rotates relate to the stator. The at least one rotor is configured to rotate between the first leg and the second leg of the at least one stator pole.

US Patent:

7839101, Nov 23, 2010

Filed:

May 2, 2008

Appl. No.:

12/114520

Inventors:

Haidong Yu - Saint Joseph MI, US
Babak Fahimi - Arlington TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02P 1/00

US Classification:

318135, 318153, 318687, 318727

Abstract:

A method and system for a control scheme for linear induction machines. The control scheme includes a maximum energy conversion ratio and a maximum acceleration and deceleration for linear induction machines.

US Patent:

8022586, Sep 20, 2011

Filed:

Feb 15, 2010

Appl. No.:

12/705900

Inventors:

Mark T. Holtzapple - College Station TX, US
George A. Rabroker - College Station TX, US
Babak Fahimi - Arlington TX, US
Mehrdad Ehsani - College Station TX, US

Assignee:

The Texas A&M University System - College Station TX
StarRotor Corporation - College Station TX

International Classification:

H02K 17/42
H02K 19/20
H02K 19/24

US Classification:

310168, 439320

Abstract:

According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. The rotor rotates relate to the stator. The at least one rotor is configured to rotate between the first leg and the second leg of the at least one stator pole.

US Patent:

8125170, Feb 28, 2012

Filed:

Jun 16, 2008

Appl. No.:

12/140232

Inventors:

Babak Fahimi - Arlington TX, US
Umamaheshwar Krishnamurthy - Arlington TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02P 6/00

US Classification:

31840035, 318701, 318721, 31840034

Abstract:

A system and technique for measuring the mutual inductance in a switched reluctance machine (SRM). In a first example embodiment of the technique, a voltage pulse is applied to primary coil when the machine is stationery. By measuring current in the primary coil and measuring induced voltages in adjacent open circuited coils mutual inductance may be determined. In another example embodiment, a voltage pulse is applied to the primary coil when the machine is stationery. The secondary coil is allowed to freewheel current through the phase. By measuring time taken by the primary phase to reach a preset value, the mutual inductance for the known position of a rotor can be determined.

US Patent:

8248829, Aug 21, 2012

Filed:

May 1, 2010

Appl. No.:

12/772199

Inventors:

Babak Fahimi - Arlington TX, US
Wei Jiang - Yangzhou, CN

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02M 7/44
H02M 7/5387

US Classification:

363 98, 363132

Abstract:

Methods and systems for phase current reconstruction are disclosed. An example method comprises: sampling a current from a power stage comprising: three phase legs, a current sensor to measure a dc-link current, and three more current sensors configured to measure three summations of currents for the power stage, storing the sampled current into a current stack if the sampled current comes from a survived sensor and is one of the phase currents from the switching state in the state stack, and reconstructing an unknown phase current by using the previously stored currents along with the sampled current to calculate the unknown phase current. Other embodiments are described and claimed.

US Patent:

8314576, Nov 20, 2012

Filed:

Jul 17, 2010

Appl. No.:

12/838442

Inventors:

Babak Fahimi - Arlington TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02P 6/12
H02P 23/14

US Classification:

31840021, 31840004, 318700

Abstract:

Methods and apparatuses for detecting faults and optimizing phase currents in an electromechanical energy converter are disclosed. An example method comprises: measuring a current of a phase of the electromechanical energy converter, modeling the electromechanical energy converter with the current measurement input into a field reconstruction module, calculating a flux linkage of the electromechanical energy converter, comparing the flux linkage with a flux linkage from a no fault electromechanical energy converter, and optimizing the current of the phase of the electromechanical energy converter in response to the comparison. Other embodiments are described and claimed.

US Patent:

8442698, May 14, 2013

Filed:

Jan 29, 2010

Appl. No.:

12/696896

Inventors:

Babak Fahimi - Arlington TX, US
Wei Jiang - Yangzhou, CN

Assignee:

Board of Regents, The University of Texas System - Austin TX

International Classification:

H02J 7/00

US Classification:

700297, 700287

Abstract:

Methods and systems for energy management are disclosed. An example system includes a first port connected to an energy storage device for bidirectional flow of energy, a second port connected to an energy source device for unidirectional flow of energy, a third port connected to a utility grid for bidirectional flow of energy, and a unified control system with control logic configured to simultaneously control energy flow between the first, second, and third ports based on at least two factors from the group consisting of: a state of charge of the energy storage device, a state of the energy source device, and a state of the utility grid. Other embodiments are described and claimed.