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).
-
Patent number: 8575479Abstract: In one embodiment, a transformer is provided for coupling between a utility connection and a plurality of power cells of a drive system. The transformer may be of a horizontal arrangement and include a housing and a core configured within the housing and having multiple columns each adapted along a horizontal axis. Each column corresponds to a phase, and each phase includes a coil having primary winding and multiple secondary windings concentrically adapted about the column horizontal axis to provide an air gap between adjacent ones of the primary and secondary windings. In addition, the transformer may include a baffler adapted about the core and configured within the housing to prevent air flow at a periphery of the coils and to direct air flow through the air gaps of the coils.Type: GrantFiled: March 17, 2011Date of Patent: November 5, 2013Assignee: TECO—Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Manzoor Hussain
-
Patent number: 8460153Abstract: A power tool that includes a housing, a motor, a planetary transmission, a first bearing and a second bearing. The motor is disposed in the housing and includes an output shaft. The planetary transmission has a sun gear, a plurality of first planet gears, a first ring gear and a carrier. The sun gear is driven by the output shaft. The first planet gears are driven by the sun gear and have teeth that are meshingly engaged to teeth of the first ring gear. The carrier includes a rear carrier plate and a front carrier plate between which the first and second planet gears are received. The rear carrier plate includes a first bearing aperture. The first bearing is received in the first bearing aperture and is configured to support the output shaft. The second bearing is received onto the rear carrier plate to support the carrier relative to the housing.Type: GrantFiled: December 17, 2010Date of Patent: June 11, 2013Assignee: Black & Decker Inc.Inventors: Scott Rudolph, Sankarshan Murthy, Daniel Puzio, Qiang Zhang, Aris Cleanthous, Mehdi Abolhassani, Ren H. Wang
-
Publication number: 20120331195Abstract: A control system may be provided for a controlled system such as a drive or inverter system. To provide for control in such system, a master controller may be present to receive, via a second communication protocol from a cabinet controller coupled to the master controller, status information of a controlled device, generate control information based at least in part on the status information, and transmit the control information to the cabinet controller via the second communication protocol. In turn, the cabinet controller can generate and communicate a control packet to the controlled device via a first communication protocol. This packet can be interleaved within another message communicated from the cabinet controller to the device.Type: ApplicationFiled: June 24, 2011Publication date: December 27, 2012Inventors: Randall Pipho, Ryan Edwards, Mehdi Abolhassani, Enrique Ledezma, Alex Skorcz, Thomas Keister
-
Patent number: 8279640Abstract: 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: GrantFiled: September 24, 2008Date of Patent: October 2, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
-
Patent number: 8254076Abstract: 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: GrantFiled: June 30, 2009Date of Patent: August 28, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
-
Patent number: 8223515Abstract: 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: GrantFiled: February 26, 2009Date of Patent: July 17, 2012Assignee: TECO—Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Ryan Edwards, Enrique Ledezma
-
Patent number: 8213198Abstract: 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: GrantFiled: April 27, 2011Date of Patent: July 3, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Enrique Ledezma, Ryan Edwards
-
Publication number: 20120127673Abstract: 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: ApplicationFiled: January 31, 2012Publication date: May 24, 2012Inventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
-
Patent number: 8130501Abstract: 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: GrantFiled: June 30, 2009Date of Patent: March 6, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
-
Patent number: 8129853Abstract: 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: GrantFiled: June 30, 2010Date of Patent: March 6, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz
-
Patent number: 8106526Abstract: 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: GrantFiled: June 30, 2010Date of Patent: January 31, 2012Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz
-
Patent number: 8045346Abstract: In one embodiment, the present invention includes a system having multiple modular transformers each including a 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: GrantFiled: September 27, 2010Date of Patent: October 25, 2011Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
-
Publication number: 20110215890Abstract: In one embodiment, a transformer is provided for coupling between a utility connection and a plurality of power cells of a drive system. The transformer may be of a horizontal arrangement and include a housing and a core configured within the housing and having multiple columns each adapted along a horizontal axis. Each column corresponds to a phase, and each phase includes a coil having primary winding and multiple secondary windings concentrically adapted about the column horizontal axis to provide an air gap between adjacent ones of the primary and secondary windings. In addition, the transformer may include a baffler adapted about the core and configured within the housing to prevent air flow at a periphery of the coils and to direct air flow through the air gaps of the coils.Type: ApplicationFiled: March 17, 2011Publication date: September 8, 2011Inventors: Mehdi Abolhassani, Manzoor Hussain
-
Publication number: 20110199033Abstract: 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: ApplicationFiled: April 27, 2011Publication date: August 18, 2011Inventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Enrique Ledezma, Ryan Edwards
-
Publication number: 20110152029Abstract: A power tool that includes a housing, a motor, a planetary transmission, a first bearing and a second bearing. The motor is disposed in the housing and includes an output shaft. The planetary transmission has a sun gear, a plurality of first planet gears, a first ring gear and a carrier. The sun gear is driven by the output shaft. The first planet gears are driven by the sun gear and have teeth that are meshingly engaged to teeth of the first ring gear. The carrier includes a rear carrier plate and a front carrier plate between which the first and second planet gears are received. The rear carrier plate includes a first bearing aperture. The first bearing is received in the first bearing aperture and is configured to support the output shaft. The second bearing is received onto the rear carrier plate to support the carrier relative to the housing.Type: ApplicationFiled: December 17, 2010Publication date: June 23, 2011Inventors: Scott Rudolph, Sankarshan Murthy, Daniel Puzio, Qiang Zhang, Aris Cleanthous, Mehdi Abolhassani, Ren H. Wang
-
Patent number: 7940537Abstract: 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: GrantFiled: December 31, 2008Date of Patent: May 10, 2011Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Alex Skorcz, Enrique Ledezma, Ryan Edwards
-
Publication number: 20110044010Abstract: 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: ApplicationFiled: July 28, 2010Publication date: February 24, 2011Inventors: Enrique Ledezma, Thomas Keister, Mehdi Abolhassani, Ryan Edwards, Alex Skorcz, Randall Pipho, Srinivas Satumahanti
-
Publication number: 20110012364Abstract: 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: ApplicationFiled: June 30, 2010Publication date: January 20, 2011Inventors: MEHDI ABOLHASSANI, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz
-
Publication number: 20110013428Abstract: In one embodiment, the present invention includes a system having multiple modular transformers each including a 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: ApplicationFiled: September 27, 2010Publication date: January 20, 2011Inventors: MEHDI ABOLHASSANI, Ryan Edwards, Thomas Keister, Alex Skorcz, Enrique Ledezma, Chao Hsu Liao
-
Patent number: 7863766Abstract: 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: GrantFiled: June 30, 2009Date of Patent: January 4, 2011Assignee: TECO-Westinghouse Motor CompanyInventors: Mehdi Abolhassani, Thomas Keister, Haran Karmaker, Ryan Edwards, Enrique Ledezma, Alex Skorcz