Patents by Inventor Takahiro Fujimaki
Takahiro Fujimaki 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: 11932307Abstract: A steering control device includes a distance calculation unit which calculates a distance between a front gaze point, which is on a straight line extending forward of a vehicle from a center of the vehicle, and a center line indicating the center of a lane where a vehicle is traveling, a steering angle detection unit which detects a steering angle of the vehicle, and a steering control unit which causes a motor, which assists steering of the vehicle, to assist the steering based on an angle formed by the lane and the straight line extending forward of the vehicle when the distance is larger than a predetermined distance, and causes the motor to assist the steering so as to fix the steering angle when the distance is the predetermined distance or smaller.Type: GrantFiled: December 10, 2018Date of Patent: March 19, 2024Assignee: ISUZU MOTORS LIMITEDInventors: Takahiro Satoh, Yuta Fujimaki, Ryota Okeya
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Patent number: 7548034Abstract: A centrifuge including: a rotor rotating with a sample contained therein; a rotating shaft rotatably engaged with the rotor; a motor rotating the rotor and the rotating shaft; a belt transmitting rotational force of the motor to the rotating shaft; a rotor speed detecting unit detecting a rotation speed of the rotor; a motor speed detecting unit detecting a rotation speed of the motor; and a control unit controlling the motor, wherein the control unit calculates a signal for controlling the rotation speed of the rotor on the basis of a signal from the rotor speed detecting unit and controls the motor on the basis of a signal from the motor speed detecting unit and the calculated signal.Type: GrantFiled: November 29, 2006Date of Patent: June 16, 2009Assignee: Hitachi Koki Co., Ltd.Inventors: Hiroyuki Takahashi, Takahiro Fujimaki, Hisanobu Oyama
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Patent number: 7372219Abstract: In a centrifugal separator of the type in which driving power of a motor is transmitted to a rotor via a power transmission mechanism, such as a belt, a motor-rotation signal frequency fm and a rotor-rotation signal frequency fr are computed, on the basis of which a frequency ratio A (fr/fm) is computed. When the frequency ratio A exceeds the upper limit of a first predetermined range, a warning message is displayed to prompt the user to perform maintenance. When the frequency ratio A exceeds the upper limit of a second predetermined range, an alarm message is displayed and the motor is stopped.Type: GrantFiled: October 4, 2006Date of Patent: May 13, 2008Assignee: Hitachi Koki Co., Ltd.Inventors: Takahiro Fujimaki, Hiroyuki Takahashi
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Publication number: 20070138988Abstract: A centrifuge including: a rotor rotating with a sample contained therein; a rotating shaft rotatably engaged with the rotor; a motor rotating the rotor and the rotating shaft; a belt transmitting rotational force of the motor to the rotating shaft; a rotor speed detecting unit detecting a rotation speed of the rotor; a motor speed detecting unit detecting a rotation speed of the motor; and a control unit controlling the motor, wherein the control unit calculates a signal for controlling the rotation speed of the rotor on the basis of a signal from the rotor speed detecting unit and controls the motor on the basis of a signal from the motor speed detecting unit and the calculated signal.Type: ApplicationFiled: November 29, 2006Publication date: June 21, 2007Inventors: Hiroyuki TAKAHASHI, Takahiro Fujimaki, Hisanobu Oyama
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Publication number: 20070075667Abstract: In a centrifugal separator of the type in which driving power of a motor is transmitted to a rotor via a power transmission mechanism, such as a belt, a motor-rotation signal frequency fm and a rotor-rotation signal frequency fr are computed, on the basis of which a frequency ratio A (fr/fm) is computed. When the frequency ratio A exceeds the upper limit of a first predetermined range, a warning message is displayed to prompt the user to perform maintenance. When the frequency ratio A exceeds the upper limit of a second predetermined range, an alarm message is displayed and the motor is stopped.Type: ApplicationFiled: October 4, 2006Publication date: April 5, 2007Inventors: Takahiro Fujimaki, Hiroyuki Takahashi
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Patent number: 7104944Abstract: A centrifugal separator facilitates maintenance with a function that provides the user with useful data for investigating the causes of failures and for preventing their recurrence, such as data needed to determine the appropriate management and replacement frequency of consumable parts. The centrifugal separator also has a storing unit for recording the number of times that the door is opened and closed, operation records of the drive unit by each shaft, and the number of operations performed by operating function, as well as a display unit for displaying the data. The centrifugal separator also includes a function for displaying messages prompting the user to perform maintenance when the aforementioned performance data reach a predetermined value.Type: GrantFiled: November 24, 2004Date of Patent: September 12, 2006Assignee: Hitachi Koki Co., Ltd.Inventors: Takahiro Fujimaki, Yoshitaka Niinai, Hiroyuki Takahashi, Shoji Kusumoto
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Publication number: 20050153823Abstract: A centrifugal separator facilitates maintenance with a function that provides the user with useful data for investigating the causes of failures and for preventing their recurrence, such as data needed to determine the appropriate management and replacement frequency of consumable parts. The centrifugal separator also has a storing unit for recording the number of times that the door is opened and closed, operation records of the drive unit by each shaft, and the number of operations performed by operating function, as well as a display unit for displaying the data. The centrifugal separator also includes a function for displaying messages prompting the user to perform maintenance when the aforementioned performance data reach a predetermined value.Type: ApplicationFiled: November 24, 2004Publication date: July 14, 2005Inventors: Takahiro Fujimaki, Yoshitaka Niinai, Hiroyuki Takahashi, Shoji Kusumoto
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Patent number: 6204627Abstract: A transformer outputs different (high or low) secondary voltages. A switch outputs high or low secondary voltage according to a mode signal. An electric power converter including a rectifying circuit and a switching circuit either charges a smoothing capacitor with an output of the switch or discharges the smoothing capacitor to supply a regenerative current toward the transformer with a power fact improved. An phase signal generation circuit generates PWM or PAM phase signals in accordance with the mode signal. An inverter circuit generates driving signals supplied to the motor in response to the phase signals from power from the smoothing capacitor. A mode determining circuit determines one of modes to generate the mode signal in accordance with a speed command signal and acceleration/deceleration which is indicated by the rotating speed signal and the rotating speed command signal.Type: GrantFiled: August 16, 1999Date of Patent: March 20, 2001Assignee: Hitachi Koki Co. Ltd.Inventors: Shinji Watanabe, Masahiro Inaniwa, Noriyasu Matsufuji, Satoshi Numata, Takahiro Fujimaki
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Patent number: 5731681Abstract: A power control apparatus for controlling power supplied to an electric motor rotating a rotor employed in a centrifuge is provided. The power control apparatus includes first and second inverters and a smoothing capacitor disposed between the first and second inverters. In a motor power mode, the first inverter charges the smoothing capacitor with power supplied by an AC power supply, while the second inverter charges, in a motor braking mode, the smoothing capacitor with power regenerated by the motor during a braking operation for returning the regenerated power back to the AC power supply through the first inverter. An reactor is arranged between the AC power supply and the first inverter for reducing harmonic components contained in the current supplied from or back to the AC power supply.Type: GrantFiled: February 12, 1997Date of Patent: March 24, 1998Assignee: Hitachi Koki Co., Ltd.Inventors: Masahiro Inaniwa, Nobuharu Kido, Takahiro Fujimaki, Shinji Watanabe, Noriyasu Matsufuji, Yoshinori Tobita
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Patent number: 5649893Abstract: A centrifugal protection apparatus including: a rotor having markers connected to a motor responsive to drive signals; first and second detectors for detecting the marker upon rotation of the rotor and generating first and second detection signals respectively; a drive circuit responsive to a command for generating the drive signals from the supply power via input terminal in response to the first or second detection signal; first and second switch circuits, arranged in series between the input terminal and the motor, for controlling the supply of the drive signals to the motor; a current detector for detecting a current of one of the drive signals and generating a current detection signal; and first and second judging portions for detecting whether the first and second detection signals are within a predetermined value and for operating the first and second switch circuits to cut off the drive signals when the first and second detection signals are not within the predetermined value respectively and when a mType: GrantFiled: May 22, 1996Date of Patent: July 22, 1997Assignee: Hitachi Koki Co., Ltd.Inventors: Masahiro Inaniwa, Shinji Watanabe, Tsutomu Takamura, Noriyasu Matsufuji, Takahiro Fujimaki
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Patent number: 5608301Abstract: A power control apparatus for controlling power supplied to an electric motor rotating a rotor employed in a centrifuge is provided. The power control apparatus includes first and second inverters and a smoothing capacitor disposed between the first and second inverters. In a motor power mode, the first inverter charges the smoothing capacitor with power supplied by an AC power supply, while the second inverter charges, in a motor braking mode, the smoothing capacitor with power regenerated by the motor during a braking operation for returning the regenerated power back to the AC power supply through the first inverter. An reactor is arranged between the AC power supply and the first inverter for reducing harmonic components contained in the current supplied from or back to the AC power supply.Type: GrantFiled: June 28, 1995Date of Patent: March 4, 1997Assignee: Hitachi Koki Co., Ltd.Inventors: Masahiro Inaniwa, Nobuharu Kido, Takahiro Fujimaki, Shinji Watanabe, Noriyasu Matsufuji, Yoshinori Tobita