Patents by Inventor Rei KASAHARA
Rei KASAHARA 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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Publication number: 20240035280Abstract: An anchorage for gripping and fixing an end portion of a tendon is provided. The anchorage includes a base having a surface; and a coating film provided at least on a contact portion of the surface of the base. The contact portion contacts the tendon when the tendon is gripped by the anchorage. The coating film has an electrical resistivity of 104 Q·m or more.Type: ApplicationFiled: July 20, 2023Publication date: February 1, 2024Inventors: Rei KASAHARA, Yoshiyuki MATSUBARA, Motonobu NISHINO, Yuka KISHIMOTO, Hiroki SHOKAWA
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Patent number: 10680544Abstract: In order to achieve a power conversion device with which a motor can be stably driven, a power conversion device is provided with: an inverter, which converts supplied DC voltage to an AC output voltage and supplies the AC output voltage to windings, and which, in accordance with the DC voltage, changes the saturation level at which the output voltage is saturated, in order to drive a motor equipped with a stator having the windings and a rotor having permanent magnets; and a controller which, when the output voltage is lower than the saturation level, increases the output current of the inverter such that a magnetic flux that weakens or strengthens the magnetic flux generated by the permanent magnets is generated in the windings. An air conditioner including the power conversion device is also disclosed.Type: GrantFiled: October 24, 2017Date of Patent: June 9, 2020Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.Inventors: Ken Kishita, Dongsheng Li, Rei Kasahara
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Patent number: 10612797Abstract: The present invention provides an outdoor unit for an air conditioner that can be constructed at low cost while reducing risk of malfunction. The outdoor unit has a compressor; a fan motor; a compressor driver board having a compressor inverter circuit and a compressor driver circuit; and a fan driver board having a fan inverter circuit and fan driver circuit. The compressor driver board has at least either: a shared control circuit that feeds a first switching signal for a compressor to the compressor driver circuit and feeds a second switching signal for a fan to the fan driver circuit; or a shared power source circuit that steps down a first DC voltage to a second DC voltage and supplies the second DC voltage to the compressor driver circuit and to the fan driver circuit.Type: GrantFiled: December 26, 2016Date of Patent: April 7, 2020Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.Inventors: Takayuki Hashimoto, Takashi Ooishi, Shin Miura, Rei Kasahara
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Publication number: 20190131903Abstract: In order to achieve a power conversion device with which a motor can be stably driven, a power conversion device is provided with: an inverter, which converts supplied DC voltage to an AC output voltage and supplies the AC output voltage to windings, and which, in accordance with the DC voltage, changes the saturation level at which the output voltage is saturated, in order to drive a motor equipped with a stator having the windings and a rotor having permanent magnets; and a controller which, when the output voltage is lower than the saturation level, increases the output current of the inverter such that a magnetic flux that weakens or strengthens the magnetic flux generated by the permanent magnets is generated in the windings. An air conditioner including the power conversion device is also disclosed.Type: ApplicationFiled: October 24, 2017Publication date: May 2, 2019Inventors: Ken KISHITA, Dongsheng LI, Rei KASAHARA
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Patent number: 10222108Abstract: The air conditioner has: an outdoor heat exchanger that exchanges heat between the air and a refrigerant flowing in the interior of this heat exchanger; an outdoor fan that blows air into the outdoor heat exchanger; an outdoor fan motor that rotationally drives the outdoor fan; an outdoor fan inverter that supplies a desired current to the outdoor fan motor; a current detector that detects the current flowing in the outdoor fan motor; and a control unit that controls the outdoor fan inverter such that the rotational frequency of the outdoor fan motor reaches a target rotational frequency. The control unit starts a defrosting operation of the outdoor heat exchanger on the basis of a detection value from the current detector during the heating operation.Type: GrantFiled: March 28, 2014Date of Patent: March 5, 2019Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.Inventors: Koji Naito, Kazumoto Urata, Kazuhiko Tani, Hiroaki Kaneko, Mikihito Tokudi, Rei Kasahara
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Publication number: 20190032928Abstract: The present invention provides an outdoor unit for an air conditioner that can be constructed at low cost while reducing risk of malfunction. The outdoor unit has a compressor; a fan motor; a compressor driver board having a compressor inverter circuit and a compressor driver circuit; and a fan driver board having a fan inverter circuit and fan driver circuit. The compressor driver board has at least either: a shared control circuit that feeds a first switching signal for a compressor to the compressor driver circuit and feeds a second switching signal for a fan to the fan driver circuit; or a shared power source circuit that steps down a first DC voltage to a second DC voltage and supplies the second DC voltage to the compressor driver circuit and to the fan driver circuit.Type: ApplicationFiled: December 26, 2016Publication date: January 31, 2019Inventors: Takayuki HASHIMOTO, Takashi OOISHI, Shin MIURA, Rei KASAHARA
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Patent number: 9893670Abstract: A controller of an inverter control apparatus includes an A/D conversion unit that performs digital conversion of an input signal when a signal for either an A/D converter start trigger or an A/D converter start trigger is input thereinto; a first inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a first carrier signal; a second inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a second carrier signal; and an A/D start factor selection unit that receives either the A/D converter start trigger or the A/D converter start trigger and selects an A/D start factor at a predetermined period timing of an operation period of the first carrier signal and the second carrier signal.Type: GrantFiled: March 30, 2017Date of Patent: February 13, 2018Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.Inventors: Rei Kasahara, Dongsheng Li
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Publication number: 20170288594Abstract: A controller of an inverter control apparatus includes an A/D conversion unit that performs digital conversion of an input signal when a signal for either an A/D converter start trigger or an A/D converter start trigger is input thereinto; a first inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a first carrier signal; a second inverter control unit that generates the A/D converter start trigger which starts the A/D conversion unit, based on A/D converter start timing information and a second carrier signal; and an A/D start factor selection unit that receives either the A/D converter start trigger or the A/D converter start trigger and selects an A/D start factor at a predetermined period timing of an operation period of the first carrier signal and the second carrier signal.Type: ApplicationFiled: March 30, 2017Publication date: October 5, 2017Inventors: Rei KASAHARA, Dongsheng LI
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Publication number: 20170010031Abstract: The air conditioner has: an outdoor heat exchanger that exchanges heat between the air and a refrigerant flowing in the interior of this heat exchanger; an outdoor fan that blows air into the outdoor heat exchanger; an outdoor fan motor that rotationally drives the outdoor fan; an outdoor fan inverter that supplies a desired current to the outdoor fan motor; a current detector that detects the current flowing in the outdoor fan motor; and a control unit that controls the outdoor fan inverter such that the rotational frequency of the outdoor fan motor reaches a target rotational frequency. The control unit starts a defrosting operation of the outdoor heat exchanger on the basis of a detection value from the current detector during the heating operation.Type: ApplicationFiled: March 28, 2014Publication date: January 12, 2017Inventors: Koji NAITO, Kazumoto URATA, Kazuhiko TANI, Hiroaki KANEKO, Mikihito TOKUDI, Rei KASAHARA