Patents by Inventor Girish Yajurvedi
Girish Yajurvedi 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).
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Patent number: 11469697Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to apply a drive signal to the power switch circuit to control the supply of power to the brushless motor. The controller is configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor within a variable speed range of zero to at least 15,000 rotations-per-minute (RPM), and control the drive signal based on the detected angular position of the rotor to electronically commutate the motor within a torque range of zero to at least 15 newton-meters (N.m.) and a power output of zero to at least 1500 watts.Type: GrantFiled: June 9, 2020Date of Patent: October 11, 2022Assignee: Black & Decker Inc.Inventors: Girish Yajurvedi, Mehdi Ramezani, Michael K. Forster, John C. Vanko, Tal Gottesman, Levent Gokdere
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Publication number: 20220255479Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to apply a drive signal to the power switch circuit to control the supply of power to the brushless motor. The controller is configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor within a variable speed range of zero to at least 15,000 rotations-per-minute (RPM), and control the drive signal based on the detected angular position of the rotor to electronically commutate the motor within a power output of zero to at least 1500 watts.Type: ApplicationFiled: April 28, 2022Publication date: August 11, 2022Inventors: Girish YAJURVEDI, Mehdi RAMEZANI, Michael K. Forster, John C. VANKO, Tal GOTTESMAN, Levent GOKDERE
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Patent number: 11374520Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. If the supply of power to the motor is turned OFF to cause the motor to slow down and is turned back ON while the rotor speed exceeds a speed threshold, the controller electronically brakes the motor for a time interval to measure the phase current of the motor and detects the angular position of the rotor based on the measured phase current.Type: GrantFiled: June 9, 2020Date of Patent: June 28, 2022Assignee: Black & Decker Inc.Inventors: Girish Yajurvedi, Mehdi Ramezani, Michael K. Forster, John C. Vanko, Tal Gottesman, Levent Gokdere
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Patent number: 11374519Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. The controller detects an initial sector within which the rotor is located at start-up, apply the drive signal so as to rotate the motor to a parking angle associated with the detected initial sector, and control a commutation sequence to drive the motor beginning at the parking angle.Type: GrantFiled: June 9, 2020Date of Patent: June 28, 2022Assignee: Black & Decker Inc.Inventors: Girish Yajurvedi, Mehdi Ramezani, Michael K. Forster, John C. Vanko, Tal Gottesman, Levent Gokdere
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Publication number: 20200389110Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. If the supply of power to the motor is turned OFF to cause the motor to slow down and is turned back ON while the rotor speed exceeds a speed threshold, the controller electronically brakes the motor for a time interval to measure the phase current of the motor and detects the angular position of the rotor based on the measured phase current.Type: ApplicationFiled: June 9, 2020Publication date: December 10, 2020Inventors: Girish YAJURVEDI, Mehdi RAMEZANI, Michael K. Forster, John C. VANKO, Tal GOTTESMAN, Levent GOKDERE
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Publication number: 20200389109Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor, and apply a drive signal to the power switch circuit to control a commutation of the motor based on the detected angular position of the rotor. The controller detects an initial sector within which the rotor is located at start-up, apply the drive signal so as to rotate the motor to a parking angle associated with the detected initial sector, and control a commutation sequence to drive the motor beginning at the parking angle.Type: ApplicationFiled: June 9, 2020Publication date: December 10, 2020Inventors: Girish YAJURVEDI, Mehdi RAMEZANI, Michael K. Forster, John C. VANKO, Tal GOTTESMAN, Levent GOKDERE
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Publication number: 20200389108Abstract: A power tool is provided including a housing, a brushless motor disposed within the housing, a power switch circuit that supplies power from a power source to the brushless motor, and a controller configured to apply a drive signal to the power switch circuit to control the supply of power to the brushless motor. The controller is configured to receive at least one signal associated with a phase current of the motor, detect an angular position of the rotor based on the phase current of the motor within a variable speed range of zero to at least 15,000 rotations-per-minute (RPM), and control the drive signal based on the detected angular position of the rotor to electronically commutate the motor within a torque range of zero to at least 15 newton-meters (N.m.) and a power output of zero to at least 1500 watts.Type: ApplicationFiled: June 9, 2020Publication date: December 10, 2020Inventors: Girish YAJURVEDI, Mehdi RAMEZANI, Michael K. Forster, John C. VANKO, Tal GOTTESMAN, Levent GOKDERE
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Patent number: 10061275Abstract: A system for tuning a control system uses a simplified tuning procedure to generate robustly stabilizing tuning parameters that reduce or eliminate undesired system oscillations in the presence of long system dead times or phase lag. A control method is used to establish a relationship between the plant parameters of a controlled system and the tuning parameters of a parameterized active disturbance rejection controller determined to be optimal or substantially optimal for the control system. The plant parameters include the system gain, time constant, and dead time. Corresponding tuning parameters include the controller bandwidth and a system gain estimate. Using the system gain estimate as a tuning parameter can alleviate the influence of large dead times or phase lags on system response. Once established, these fixed relationships can be used to determine suitable tuning parameters for specific motion or process control applications based on the system gain and dominant constraints of the system.Type: GrantFiled: July 29, 2014Date of Patent: August 28, 2018Assignee: LINESTREAM TECHNOLOGIESInventors: Ahmed El-Shaer, Gang Tian, Girish Yajurvedi
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Publication number: 20160033944Abstract: A system for tuning a control system uses a simplified tuning procedure to generate robustly stabilizing tuning parameters that reduce or eliminate undesired system oscillations in the presence of long system dead times or phase lag. A control method is used to establish a relationship between the plant parameters of a controlled system and the tuning parameters of a parameterized active disturbance rejection controller determined to be optimal or substantially optimal for the control system. The plant parameters include the system gain, time constant, and dead time. Corresponding tuning parameters include the controller bandwidth and a system gain estimate. Using the system gain estimate as a tuning parameter can alleviate the influence of large dead times or phase lags on system response. Once established, these fixed relationships can be used to determine suitable tuning parameters for specific motion or process control applications based on the system gain and dominant constraints of the system.Type: ApplicationFiled: July 29, 2014Publication date: February 4, 2016Inventors: Ahmed El-Shaer, Gang Tian, Girish Yajurvedi