Patents by Inventor Akira Saruta
Akira Saruta 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: 7007505Abstract: A refrigerating device including a refrigerating cycle including a plurality of compressors driven by motors, the plurality of compressors comprising a variable speed compressor which can be controlled in capacity and a constant speed compressor which is driven by a motor of which rotor core comprising a cage type conductor and permanent magnets.Type: GrantFiled: May 26, 2004Date of Patent: March 7, 2006Assignee: Hitachi, Ltd., Trustee for the Benefit of Hitachi Air Conditioning Systems, Co., Ltd.Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 6966194Abstract: A refrigerating machine having a compressor driven by a motor. The motor incorporates an armature with an iron core having a cage type conductor and a permanent magnet which is magnetized so as to enable the motor to operate as a synchronous motor. A bypass passage is provided between a discharge side of the compressor and a suction side of the compressor, a shut-off valve is provided for opening and closing the bypass passage, a pressure detecting device is provided for detecting a discharge pressure from the compressor and a current detector is provided for detecting a value of drive current for the compressor. The shut-off valve is opened and closed in accordance with the discharge pressure and the value of the drive current.Type: GrantFiled: December 13, 2004Date of Patent: November 22, 2005Assignee: Hitachi, Ltd.Inventors: Atsuhiko Yokozeki, Susumu Nakayama, Kenji Tojo, Akira Saruta, Mutsunori Matsunaga, Satoshi Kikuchi
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Publication number: 20050086960Abstract: A refrigerating machine having a compressor driven by a motor. The motor incorporates an armature with an iron core having a cage type conductor and a permanent magnet which is magnetized so as to enable the motor to operate as a synchronous motor. A bypass passage is provided between a discharge side of the compressor and a suction side of the compressor, a shut-off valve is provided for opening and closing the bypass passage, a pressure detecting device is provided for detecting a discharge pressure from the compressor and a current detector is provided for detecting a value of drive current for the compressor. The shut-off valve is opened and closed in accordance with the discharge pressure and the value of the drive current.Type: ApplicationFiled: December 13, 2004Publication date: April 28, 2005Inventors: Atsuhiko Yokozeki, Susumu Nakayama, Kenji Tojo, Akira Saruta, Mutsunori Matsunaga, Satoshi Kikuchi
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Patent number: 6832488Abstract: A refrigerating machine includes a plurality of compressors driven by motors each having an armature core incorporating a squirrel cage conductor and a permanent magnet which is magnetized so as to allow the motor to serve as a synchronous motor, and a compressor drive circuit for selectively driving the motor at a power source frequency by a commercial power source or at a variable frequency by an inverter. Thus, the overall efficiency of the refrigerating machine can be enhanced.Type: GrantFiled: July 8, 2003Date of Patent: December 21, 2004Assignee: Hitachi, Ltd.Inventors: Atsuhiko Yokozeki, Susumu Nakayama, Kenji Tojo, Akira Saruta, Mutsunori Matsunaga, Satoshi Kikuchi
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Publication number: 20040211213Abstract: A refrigerating device including a refrigerating cycle including a plurality of compressors driven by motors, the plurality of compressors comprising a variable speed compressor which can be controlled in capacity and a constant speed compressor which is driven by a motor of which rotor core comprising a cage type conductor and permanent magnets.Type: ApplicationFiled: May 26, 2004Publication date: October 28, 2004Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 6772607Abstract: A refrigerating device including a refrigerating cycle including a plurality of compressors driven by motors, the plurality of compressors comprising a variable speed compressor which can be controlled in capacity and a constant speed compressor which is driven by a motor of which rotor core comprising a cage type conductor and permanent magnets.Type: GrantFiled: October 24, 2002Date of Patent: August 10, 2004Assignee: Hitachi, Ltd.Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Publication number: 20040040323Abstract: A refrigerating machine includes a plurality of compressors driven by motors each having an armature core incorporating a squirrel cage conductor and a permanent magnet which is magnetized so as to allow the motor to serve as a synchronous motor, and a compressor drive circuit for selectively driving the motor at a power source frequency by a commercial power source or at a variable frequency by an inverter. Thus, the overall efficiency of the refrigerating machine can be enhanced.Type: ApplicationFiled: July 8, 2003Publication date: March 4, 2004Inventors: Atsuhiko Yokozeki, Susumu Nakayama, Kenji Tojo, Akira Saruta, Mutsunori Matsunaga, Satoshi Kikuchi
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Publication number: 20030071533Abstract: A self-starting synchronous motor and a compressor including the motor are disclosed. The self-starting synchronous motor comprises at least a squirrel-cage conductor buried in the neighborhood of the outer peripheral portion of a rotor core, and a plurality of permanent magnets buried in the periphery inward of the squirrel-cage conductor. The armature winding for the stator is wound in concentrated way, and the two ends of each of the teeth are expanded to form at least a disuniform gap between the stator and the rotor. At least an arcuate permanent magnet is buried in the rotor, and a squirrel-cage conductor is buried also between the magnetic poles.Type: ApplicationFiled: September 10, 2002Publication date: April 17, 2003Inventors: Satoshi Kikuchi, Haruo Koharagi, Tomio Yoshikawa, Akira Saruta, Susumu Nakayama, Miyoshi Takahashi
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Publication number: 20030056534Abstract: A refrigerating device including a refrigerating cycle including a plurality of compressors driven by motors, the plurality of compressors comprising a variable speed compressor which can be controlled in capacity and a constant speed compressor which is driven by a motor of which rotor core comprising a cage type conductor and permanent magnets.Type: ApplicationFiled: October 24, 2002Publication date: March 27, 2003Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 6505480Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: GrantFiled: April 3, 2002Date of Patent: January 14, 2003Assignee: Hitachi Ltd.Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Publication number: 20020095950Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: ApplicationFiled: April 3, 2002Publication date: July 25, 2002Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 6408645Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: GrantFiled: August 10, 2001Date of Patent: June 25, 2002Assignee: Hitachi Air Conditioning Systems, Co. Ltd.Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Publication number: 20020026806Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: ApplicationFiled: August 10, 2001Publication date: March 7, 2002Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 6305187Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: GrantFiled: April 19, 2000Date of Patent: October 23, 2001Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
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Patent number: 5035519Abstract: A thrust bearing including a ring-like form plate body, and a plurality of rib members provided on the ring-like form plate body of the thrust bearing. Such a plurality of rib members may be provided on a thrust runner. The rib members cause a difference in load deformation amount in a circumferential direction according to thrust load and generate a wedge-shaped form clearance between a sliding face of the thrust bearing and a sliding face of the thrust runner. Since the wedge-shaped form clearance is formed by utilizing the load deformation, even when the thrust load becomes large, the wedge-shaped form clearance does not become narrow. The occurrence of dynamic pressure by the wedge effect and the formation of a water film can be assured, and the temperature increase between the sliding face of the thrust runner and the sliding face of the thrust bearing can be restrained.Type: GrantFiled: March 5, 1990Date of Patent: July 30, 1991Assignee: Hitachi, Ltd.Inventors: Kooji Aizawa, Katsutoshi Nii, Kazuhiko Kawaike, Kengo Hasegawa, Akira Saruta, Ryoichi Nakashima
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Patent number: 4564777Abstract: A novel rotor construction is disclosed, in which plural permanent magnets are arranged on the outer periphery of a rotor core, which are protected with a cover, and in which a member is placed at an axial end of the rotor core cast with end rings with a balance weight on the outside thereof. The protective cover protects the outer peripheries of the end rings and dampens the centrifugal force of the balance weight. Projections provided on the outer periphery of the member are located at the center of the permanent magnets to reduce the leakage magnetic fluxes between the permanent magnets.Type: GrantFiled: April 24, 1984Date of Patent: January 14, 1986Assignee: Hitachi, Ltd.Inventors: Masaharu Senoo, Keizi Noma, Akira Saruta, Masanori Yoshizaki, Koichi Teshirogi, Kouei Yaegashi