Patents by Inventor Mehdi Abolhassani

Mehdi Abolhassani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100327666
    Abstract: In one embodiment, the present invention includes a turbine to generate mechanical energy from kinetic energy, a generator coupled to the turbine to receive the mechanical energy and to output multiple isolated supply powers, and multiple power stages each coupled to the generator. Each of the power stages may receive at least one of the isolated supply powers.
    Type: Application
    Filed: June 30, 2010
    Publication date: December 30, 2010
    Inventors: Mehdi Abolhassani, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz
  • Publication number: 20100328848
    Abstract: In one embodiment, a medium voltage drive system includes at least one transformer and multiple power cell chambers each coupled to a transformer. The power cell chambers each may include a rectifier, a DC-link, and an inverter. Each power cell chamber can be separated into fixed and moveable portions, where the moveable portion includes the rectifier and the inverter and the fixed portion includes the DC-link. A power service bus can couple the fixed and moveable portions of each power cell chamber and couple in series groups of the plurality of power cell chambers.
    Type: Application
    Filed: June 30, 2009
    Publication date: December 30, 2010
    Inventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
  • Publication number: 20100328883
    Abstract: In one embodiment, a power cell chamber for a drive system includes moveable and fixed portions. The moveable portion includes a rectifier stage to rectify an input signal received from a secondary winding of a transformer to provide a rectified signal and an inverter stage having a plurality of switching devices to receive a DC signal and output an AC signal. This moveable portion can be slidably adapted within a cabinet of the drive system. In turn, the fixed portion includes a DC link having at least one capacitor to receive the rectified signal and provide the DC signal to the inverter stage.
    Type: Application
    Filed: June 30, 2009
    Publication date: December 30, 2010
    Inventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
  • Patent number: 7830681
    Abstract: In one embodiment, the present invention includes a system having multiple modular transformers each including a phase-shifted primary winding coupled to an input power source and phase-shifted secondary windings each coupled to a power cell. The system further includes different phase output lines coupled to a load. These lines may include first, second and third phase output lines.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: November 9, 2010
    Assignee: TECO-Westinghouse Motor Company
    Inventors: Mehdi Abolhassani, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
  • Patent number: 7821217
    Abstract: A power tool may include an electronically commutated motor such as, for example, a brushless DC permanent magnet motor with a rotor having internally mounted magnets and/or cavities filled with air or other non-magnetic materials. A control system may be used to control the motor in a manner that implements field weakening when the speed of the motor increases beyond its rated motor speed, or when the torque demands on the motor continue to increase after the maximum power output of the motor is reached. The field weakening may offset the growing back EMF and may enable a constant power and constant efficiency to be achieved by the motor over a wide speed range, rather than at just a single predetermined operating speed. Pulse width modulation control of the motor may be used up until the motor reaches its maximum power output.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: October 26, 2010
    Assignee: Black & Decker Inc.
    Inventors: Mehdi Abolhassani, Shailesh P. Waikar, Ren H. Wang, Uday S. Deshpande
  • Publication number: 20100213921
    Abstract: A transformer module includes a main primary winding coupled to a first input power source to receive a medium voltage signal, multiple main secondary windings each to couple to a power cell of a drive system, and an auxiliary primary winding coupled to a second input power source to receive a low voltage signal. The auxiliary primary winding can be spatially separated from the main windings to increase leakage inductance. The auxiliary primary winding can be active during a pre-charge operation to pre-charge the power cells.
    Type: Application
    Filed: February 26, 2009
    Publication date: August 26, 2010
    Inventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Ryan Edwards, Enrique Ledezma
  • Publication number: 20100142234
    Abstract: In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform partial regeneration. A controller may be included in the system to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system.
    Type: Application
    Filed: December 31, 2008
    Publication date: June 10, 2010
    Inventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Enrique Ledezma, Ryan Edwards
  • Publication number: 20100133816
    Abstract: In one embodiment, the present invention includes a turbine to generate mechanical energy from kinetic energy, a generator coupled to the turbine to receive the mechanical energy and to output multiple isolated supply powers, and multiple power stages each coupled to the generator. Each of the power stages may receive at least one of the isolated supply powers.
    Type: Application
    Filed: June 30, 2009
    Publication date: June 3, 2010
    Inventors: Mehdi Abolhassani, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz
  • Publication number: 20100073970
    Abstract: In one embodiment, a system may include multiple transformers each to provide an output to one or more power cells, where the power cells provide AC power to a load. Each transformer may have at least one primary winding and multiple secondary windings, where the primary winding of each transformer is phase shifted with respect to its neighboring transformers and the secondary windings are also phase shifted. The phase shift of the primary winding can be based on the phase shift of the secondary windings and a number of the plurality of transformers.
    Type: Application
    Filed: September 24, 2008
    Publication date: March 25, 2010
    Inventors: Mehdi Abolhassani, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
  • Publication number: 20100072824
    Abstract: In one embodiment, the present invention includes a system having multiple modular transformers each including a phase-shifted primary winding coupled to an input power source and phase-shifted secondary windings each coupled to a power cell. The system further includes different phase output lines coupled to a load. These lines may include first, second and third phase output lines.
    Type: Application
    Filed: September 24, 2008
    Publication date: March 25, 2010
    Inventors: Mehdi Abolhassani, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
  • Publication number: 20070267990
    Abstract: A power tool may include an electronically commutated motor such as, for example, a brushless DC permanent magnet motor with a rotor having internally mounted magnets and/or cavities filled with air or other non-magnetic materials. A control system may be used to control the motor in a manner that implements field weakening when the speed of the motor increases beyond its rated motor speed, or when the torque demands on the motor continue to increase after the maximum power output of the motor is reached. The field weakening may offset the growing back EMF and may enable a constant power and constant efficiency to be achieved by the motor over a wide speed range, rather than at just a single predetermined operating speed. Pulse width modulation control of the motor may be used up until the motor reaches its maximum power output.
    Type: Application
    Filed: May 22, 2007
    Publication date: November 22, 2007
    Applicant: BLACK & DECKER INC.
    Inventors: Mehdi Abolhassani, Shailesh P. Waikar, Ren H. Wang, Uday S. Deshpande