Patents by Inventor Ryozo Masaki
Ryozo Masaki 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: 7605517Abstract: A claw pole type rotating electric machine includes first and second claw cores which are disposed on a ring shaped ring yoke portion and a plurality of claw magnetic poles which extend in the axial direction are provided, and stator cores are formed by meshing of the claw magnetic poles with each other, and the stator is formed by holding the ring coils on the outer circumference side of the claw magnetic poles, wherein the first and second claw cores are formed by powder cores, the radial direction thickness of the claw magnetic pole is 2 mm or more, a flat surface is formed perpendicular to the axial direction at the end extending in the axial direction of the claw magnetic pole, a ejection taper in the circumference direction of the claw magnetic pole is formed in the range of 10 degrees or less, and the ratio of the axial direction length of the claw magnetic pole and the axial direction thickness of the ring yoke portion is no more than 5:1.Type: GrantFiled: September 27, 2006Date of Patent: October 20, 2009Assignees: Hitachi Industrial Equipment Systems Co., Ltd., Hitachi Powered Metals Co., Ltd., Japan Servo Co., Ltd.Inventors: Yuji Enomoto, Motoya Ito, Shoji Ohiwa, Ryozo Masaki, Chio Ishihara
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Publication number: 20070075605Abstract: A claw pole type rotating electric machine comprising first and second claw cores which are disposed on a ring shaped ring yoke portion and a plurality of claw magnetic poles which extend in the axial direction are provided, and stator cores are formed by meshing of the claw magnetic poles with each other, and the stator is formed by holding the ring coils on the outer circumference side of the claw magnetic poles, wherein the first and second claw cores are formed by powder cores, the radial direction thickness of the claw magnetic pole is 2 mm or more, a flat surface is formed perpendicular to the axial direction at the end extending in the axial direction of the claw magnetic pole, a ejection taper in the circumference direction of the claw magnetic pole is formed in the range of 10 degrees or less, and the ratio of the axial direction length of the claw magnetic pole and the axial direction thickness of the ring yoke portion is no more than 5:1.Type: ApplicationFiled: September 27, 2006Publication date: April 5, 2007Inventors: Yuji Enomoto, Motoya Ito, Shoji Ohiwa, Ryozo Masaki, Chio Ishihara
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Patent number: 6390064Abstract: An apparatus of controlling an electronically controllable throttle valve for car has a sensor for detecting the opening of the throttle valve and a microcomputer. A throttle valve opening command value is delivered in the form of a digital signal under the control of the microcomputer. The digital command value signal is converted into an analog signal and on the basis of the analog signal and a detected throttle opening, a motor connected to the throttle valve is driven to control the opening thereof.Type: GrantFiled: April 24, 2001Date of Patent: May 21, 2002Assignee: Hitachi, Ltd.Inventors: Katsuji Marumoto, Masatoshi Hoshino, Ryozo Masaki, Minoru Ohsuga, Mitsuru Watabe
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Publication number: 20010015196Abstract: An apparatus of controlling an electronically controllable throttle valve for car has a sensor for detecting the opening of the throttle valve and a microcomputer. A throttle valve opening command value is delivered in the form of a digital signal under the control of the microcomputer. The digital command value signal is converted into an analog signal and on the basis of the analog signal and a detected throttle opening, a motor connected to the throttle valve is driven to control the opening thereof.Type: ApplicationFiled: April 24, 2001Publication date: August 23, 2001Applicant: Hitachi, Ltd.Inventors: Katsuji Marumoto, Masatoshi Hoshino, Ryozo Masaki, Minoru Ohsuga, Mitsuru Watabe
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Patent number: 6253733Abstract: An apparatus of controlling an electronically controllable throttle valve for car has a sensor for detecting the opening of the throttle valve and a microcomputer. A throttle valve opening command value is delivered in the form of a digital signal under the control of the microcomputer. The digital command value signal is converted into an analog signal and on the basis of the analog signal and a detected throttle opening, a motor connected to the throttle valve is driven to control the opening thereof.Type: GrantFiled: March 20, 2000Date of Patent: July 3, 2001Assignee: Hitachi, Ltd.Inventors: Katsuji Marumoto, Masatoshi Hoshino, Ryozo Masaki, Minoru Ohsuga, Mitsuru Watabe
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Patent number: 6242882Abstract: The present invention addresses a problem as to how to provide a motor control apparatus which has a magnetic pole position inferring means capable of inferring the position of a magnetic pole of a synchronous motor by adopting a simple method in a short period of time with a high degree of accuracy. In order to solve this problem, a signal id1* for inference use is applied and a peak value iqh of a response current iq′ is detected by an iq′ peak detecting unit. The peak value iqh is then supplied to a magnetic pole position inferring unit for inferring the position of the magnetic pole of the synchronous motor by carrying out multiplication processing.Type: GrantFiled: November 19, 1999Date of Patent: June 5, 2001Assignee: Hitachi, Ltd.Inventors: Satoru Kaneko, Ryozo Masaki
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Patent number: 6225774Abstract: In an a.c. motor control method and apparatus, operations are carried out at a current controller and a voltage setting using interrupt signals generated in synchronism with maximum and minimum values of a carrier wave at a control device for controlling an inverter for driving an alternating current motor. In operations at the voltage setting part carried out using one of the interrupt signals, a carrier wave is corrected in such a manner that phases of voltage command values gradually come into synchronism with a carrier wave. An integral multiple of the period of the carrier wave becomes the period of the a.c. voltage and current control operation timing is carried out in synchronism with the carrier wave.Type: GrantFiled: October 19, 1999Date of Patent: May 1, 2001Assignee: Hitachi, Ltd.Inventors: Ryozo Masaki, Yoshitaka Iwaji, Satoru Kaneko
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Patent number: 6055960Abstract: An apparatus of controlling an electronically controllable throttle valve for car has a sensor for detecting the opening of the throttle valve and a microcomputer. A throttle valve opening command value is delivered in the form of a digital signal under the control of the microcomputer. The digital command value signal is converted into an analog signal and on the basis of the analog signal and a detected throttle opening, a motor connected to the throttle valve is driven to control the opening thereof.Type: GrantFiled: July 2, 1999Date of Patent: May 2, 2000Assignee: Hitachi, Ltd.Inventors: Katsuji Marumoto, Masatoshi Hoshino, Ryozo Masaki, Minoru Ohsuga, Mitsuru Watabe
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Patent number: 6043624Abstract: In an a.c. motor control method and apparatus, operations are carried out at a current controller and a voltage setting using interrupt signals generated in synchronism with maximum and minimum values of a carrier wave at a control device for controlling an inverter for driving an alternating current motor. In operations at the voltage setting part carried out using one of the interrupt signals, a carrier wave is corrected in such a manner that phases of voltage command values gradually come into synchronism with a carrier wave. An integral multiple of the period of the carrier wave becomes the period of the a.c. voltage and current control operation timing is carried out in synchronism with the carrier wave.Type: GrantFiled: June 10, 1998Date of Patent: March 28, 2000Assignee: Hitachi, Ltd.Inventors: Ryozo Masaki, Yoshitaka Iwaji, Satoru Kaneko
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Patent number: 6005365Abstract: The present invention addresses a problem as to how to provide a motor control apparatus which has a magnetic pole position inferring means capable of inferring the position of a magnetic pole of a synchronous motor by adopting a simple method in a short period of time with a high degree of accuracy. In order to solve this problem, a signal id1* for inference use is applied and a peak value iqh of a response current iq' is detected by an iq' peak detecting unit. The peak value iqh is then supplied to a magnetic pole position inferring unit for inferring the position of the magnetic pole of the synchronous motor by carrying out multiplication processing.Type: GrantFiled: May 21, 1998Date of Patent: December 21, 1999Assignee: Hitachi, Ltd.Inventors: Satoru Kaneko, Ryozo Masaki