Patents by Inventor Masakazu Hase
Masakazu Hase 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: 11448217Abstract: A technique is provided that can further reduce power at the time of “unload operation control” in a gas compressor that generates a compressed gas at a set pressure by constant-speed control. The gas compressor includes a compressor main unit, a drive source, an intake throttle valve, a gas release valve, rotation speed converting means, a pressure detecting device that detects a discharge pressure, and a controller that, the relationship between an upper-limit pressure H and a lower-limit pressure L being H>L, carries out opening the intake throttle valve and closing the gas release valve and operating the drive source at a full-load rotation speed until the discharge pressure reaches the upper-limit pressure H. The controller carries out at least one of closing the intake throttle valve and opening the gas release valve to reduce the discharge pressure to within a predetermined range when the discharge pressure reaches the upper-limit pressure H.Type: GrantFiled: March 26, 2019Date of Patent: September 20, 2022Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Masakazu Hase, Hideharu Tanaka, Akira Iyozumi, Masahiko Takano, Kenji Morita, Shigeyuki Yorikane, Takashi Nakajima, Yoshihiko Sagawa
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Publication number: 20220136513Abstract: A gas compressor includes: a compressor main body that compresses gas and discharges the compressed gas; an electric motor that supplies driving force; a power conversion device that supplies predetermined frequency power to the electric motor; at least one of a suction throttle valve disposed on the suction side of the compression main body and an air release valve that releases the compressed gas in a discharge piping system to an atmospheric pressure environment, and a controller. The gas compressor performs unload operation of reducing, when a discharge pressure reaches a predetermined pressure, a load on the compressor main body by closing the suction throttle valve or opening the air release valve. The gas compressor further includes a current value detector that detects a current value inputted to the power conversion device and outputs the current value to the controller.Type: ApplicationFiled: March 24, 2020Publication date: May 5, 2022Inventors: Kenji MORITA, Masahiko TAKANO, Masakazu HASE
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Publication number: 20210017988Abstract: A technique is provided that can further reduce power at the time of “unload operation control” in a gas compressor that generates a compressed gas at a set pressure by constant-speed control. The gas compressor includes a compressor main unit, a drive source, an intake throttle valve, a gas release valve, rotation speed converting means, a pressure detecting device that detects a discharge pressure, and a controller that, the relationship between an upper-limit pressure H and a lower-limit pressure L being H>L, carries out opening the intake throttle valve and closing the gas release valve and operating the drive source at a full-load rotation speed until the discharge pressure reaches the upper-limit pressure H. The controller carries out at least one of closing the intake throttle valve and opening the gas release valve to reduce the discharge pressure to within a predetermined range when the discharge pressure reaches the upper-limit pressure H.Type: ApplicationFiled: March 26, 2019Publication date: January 21, 2021Inventors: Masakazu HASE, Hideharu TANAKA, Akira IYOZUMI, Masahiko TAKANO, Kenji MORITA, Shigeyuki YORIKANE, Takashi NAKAJIMA, Yoshihiko SAGAWA
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Patent number: 9136788Abstract: Disclosed is a motor control apparatus for controlling a synchronous motor, which includes a receiver section for receiving the value detected by a temperature sensor installed inside the synchronous motor. The synchronous motor is started up with the current fed into it, whose magnitude is changed in accordance with the temperature received by the receiver section at the time of starting up the synchronous motor. In this way, the stable startup of the synchronous motor can be guaranteed and the useful life of the semiconductor elements can also be prolonged.Type: GrantFiled: February 16, 2009Date of Patent: September 15, 2015Assignee: Hitachi, Ltd.Inventors: Tomofumi Okubo, Norinaga Suzuki, Hajime Uematsu, Hideharu Tanaka, Masakazu Hase, Yoshiyuki Taguchi
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Patent number: 8608450Abstract: The present invention is a compressor compressing air, an electric motor driving the compressor, and an inverter variably controlling a rotating speed of the electric motor, the compressed air manufacturing facility is provided with a pressure sensor detecting a discharge pressure of the compressor at an upstream side position of a discharge air system connected to a discharge side of the compressor, and a control apparatus computing a pressure loss of the discharge air system in correspondence to a rotating speed of the electric motor, and changing a control range of the discharge pressure of the compressor at the upstream side position of the discharge air system on the basis of the computation in such a manner that a terminal pressure at a downstream side position of the discharge air system comes to a predetermined range.Type: GrantFiled: March 9, 2009Date of Patent: December 17, 2013Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Masakazu Hase, Hiroyuki Matsuda
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Patent number: 8257053Abstract: In order to provide a compressed air manufacturing facility which can increase a stability of a supply pressure while obtaining an energy saving effect, in a compressed air manufacturing facility provided with a compressor compressing an air, an electric motor driving the compressor, and an inverter variably controlling a rotating speed of the electric motor, the compressed air manufacturing facility is provided with a pressure sensor detecting a discharge pressure of the compressor at an upstream side position of a discharge air system connected to a discharge side of the compressor, and a control apparatus computing a pressure loss of the discharge air system in correspondence to a rotating speed of the electric motor, and changing a control range of the discharge pressure of the compressor at the upstream side position of the discharge air system on the basis of the computation in such a manner that a terminal pressure at a downstream side position of the discharge air system comes to a predetermined rangeType: GrantFiled: March 20, 2007Date of Patent: September 4, 2012Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Masakazu Hase, Hiroyuki Matsuda
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Publication number: 20110056226Abstract: Disclosed is a motor control apparatus for controlling a synchronous motor, which includes a receiver section for receiving the value detected by a temperature sensor installed inside the synchronous motor. The synchronous motor is started up with the current fed into it, whose magnitude is changed in accordance with the temperature received by the receiver section at the time of starting up the synchronous motor. In this way, the stable startup of the synchronous motor can be guaranteed and the useful life of the semiconductor elements can also be prolonged.Type: ApplicationFiled: February 16, 2009Publication date: March 10, 2011Applicant: Hitachi, Ltd.Inventors: Tomofumi Okubo, Norinaga Suzuki, Hajime Uematsu, Hideharu Tanaka, Masakazu Hase, Yoshiyuki Taguchi
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Patent number: 7808202Abstract: In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of an AC voltage and the detected current values of the inverter, and the resulting estimated pulsating frequency value and detected current values are used to correct the output voltage of the inverter.Type: GrantFiled: December 28, 2007Date of Patent: October 5, 2010Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Kiyoshi Sakamoto, Hajime Uematsu, Masakazu Hase
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Patent number: 7719226Abstract: Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an estimated frequency value.Type: GrantFiled: December 27, 2007Date of Patent: May 18, 2010Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Daigo Kaneko, Hajime Uematsu, Masakazu Hase
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Publication number: 20090169396Abstract: In order to provide a compressed air manufacturing facility which can increase a stability of a supply pressure while obtaining an energy saving effect, in a compressed air manufacturing facility provided with a compressor compressing an air, an electric motor driving the compressor, and an inverter variably controlling a rotating speed of the electric motor, the compressed air manufacturing facility is provided with a pressure sensor detecting a discharge pressure of the compressor at an upstream side position of a discharge air system connected to a discharge side of the compressor, and a control apparatus computing a pressure loss of the discharge air system in correspondence to a rotating speed of the electric motor, and changing a control range of the discharge pressure of the compressor at the upstream side position of the discharge air system on the basis of the computation in such a manner that a terminal pressure at a downstream side position of the discharge air system comes to a predetermined rangeType: ApplicationFiled: March 9, 2009Publication date: July 2, 2009Inventors: Masakazu Hase, Hiroyuki Matsuda
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Publication number: 20080157709Abstract: Current command values are used instead of detected current values to estimate axis error by calculation. An axis error command value is generated according to a speed command value, and a difference between the generated axis error command value and the estimated axis error value is used to control an estimated frequency value.Type: ApplicationFiled: December 27, 2007Publication date: July 3, 2008Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Daigo Kaneko, Hajime Uematsu, Masakazu Hase
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Publication number: 20080157710Abstract: In a driving system for an inverter that uses a diode rectifying circuit to convert a single-phase or three-phase AC voltage to a desired DC voltage and drives a permanent magnet motor, a DC-voltage pulsating frequency is estimated from a pulsating frequency setting calculated from the power supply frequency of an AC voltage and the detected current values of the inverter, and the resulting estimated pulsating frequency value and detected current values are used to correct the output voltage of the inverter.Type: ApplicationFiled: December 28, 2007Publication date: July 3, 2008Inventors: Kazuaki Tobari, Yoshitaka Iwaji, Kiyoshi Sakamoto, Hajime Uematsu, Masakazu Hase
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Publication number: 20080014097Abstract: In order to provide a compressed air manufacturing facility which can increase a stability of a supply pressure while obtaining an energy saving effect, in a compressed air manufacturing facility provided with a compressor compressing an air, an electric motor driving the compressor, and an inverter variably controlling a rotating speed of the electric motor, the compressed air manufacturing facility is provided with a pressure sensor detecting a discharge pressure of the compressor at an upstream side position of a discharge air system connected to a discharge side of the compressor, and a control apparatus computing a pressure loss of the discharge air system in correspondence to a rotating speed of the electric motor, and changing a control range of the discharge pressure of the compressor at the upstream side position of the discharge air system on the basis of the computation in such a manner that a terminal pressure at a downstream side position of the discharge air system comes to a predetermined rangeType: ApplicationFiled: March 20, 2007Publication date: January 17, 2008Inventors: Masakazu Hase, Hiroyuki Matsuda
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Patent number: 6287083Abstract: A compressed air production facility includes at least one variable speed compressor and a plurality of constant speed compressor, which are connected in parallel with one another. The variable speed compressor and the plurality of constant speed compressors are capacitively controlled with the use of a pressure in an air reservoir into which discharge air from these compressor are led. Both upper limit pressure at which the variable speed compressor is turned into its load operation mode into its unload operation mode and a lower limit pressure at which the variable speed compressor is turned into its unload operation mode into its load operation mode are set between an upper limit change-over pressure at which all of the plurality of constant speed compressors are turned into their load operation into their unload operation and a lower limit change-over pressure at which all of the plurality of constant speed compressors are changed over from their unload operation into their load operation.Type: GrantFiled: March 16, 2000Date of Patent: September 11, 2001Assignee: Hitachi, Ltd.Inventors: Masakazu Hase, Masakazu Aoki, Hiroyuki Matsuda
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Patent number: D550721Type: GrantFiled: December 11, 2006Date of Patent: September 11, 2007Assignee: Hitachi Industrial Equipment Systems Co.Inventors: Hideharu Tanaka, Masahiko Takano, Masakazu Hase, Tomotake Sakaguchi, Hiroyuki Matsuda