Patents by Inventor Hideo Matsushiro
Hideo Matsushiro 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: 7113414Abstract: An inverter control device for driving a motor with small size, light weight and low cost is provided. The inverter control device includes a first motor voltage command corrector that corrects a voltage command of each phase by multiplying the each phase voltage command by a PN voltage correction coefficient, and a second motor voltage command corrector that corrects again the each phase voltage command once corrected by the first motor voltage command corrector, only when any one of the phase voltage commands corrected by the first motor voltage command corrector is larger than the inverter DC voltage, by multiplying the voltage command of each phase corrected by the first motor voltage command corrector by the inverter DC voltage value, and dividing the product of the multiplication by the maximum value of the phase voltage commands corrected by the first motor voltage command corrector.Type: GrantFiled: March 26, 2004Date of Patent: September 26, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideo Matsushiro, Mitsuo Kawaji, Tomohiro Sugimoto, Hideki Nakata, Mitsuo Ueda
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Patent number: 7095208Abstract: A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter, so that a small, light and low-cost inverter controller for driving a motor can be implemented, and even when an inverter DC voltage largely fluctuates and it is difficult to drive the motor, the motor can be kept driving by operating the inverter such that a voltage applied to the motor may stay constant by a motor voltage command corrector which generates a motor voltage command correction value of the motor.Type: GrantFiled: March 30, 2004Date of Patent: August 22, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsuo Kawaji, Hideo Matsushiro, Tomohiro Sugimoto
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Patent number: 6984948Abstract: In a motor control apparatus of the present invention, a control section which receives an input voltage to an inverter circuit, a motor current flowing to a brushless motor and a motor current command value indicating the value of a current required to flow to the inverter circuit, and controls the inverter circuit by maintaining a phase of the voltage applied to the brushless motor when the value of the input voltage to the inverter circuit is smaller than the value of a voltage required to be applied to the brushless motor.Type: GrantFiled: December 10, 2003Date of Patent: January 10, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideki Nakata, Mitsuo Ueda, Hideo Matsushiro, Masanori Ogawa, Mitsuo Kawaji, Tomohiro Sugimoto
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Patent number: 6972541Abstract: An inverter control device for driving a motor with small size, light weight and low cost is provided. The inverter control device generates PN voltage correction coefficient by dividing the reference DC voltage by the detected DC voltage, and corrects the voltage command of each phase by multiplying the voltage command of each phase obtained by the motor voltage command generator with the PN voltage correction coefficient output from the PN voltage corrector, thus resulting in the corrected motor voltage command. The inverter control device has, in generating PN voltage correction coefficient, a first mode in which the PN voltage correction coefficient is set to 1 when the DC voltage value is more than the reference DC voltage, and a second mode in which the value obtained by dividing the reference DC voltage by the detected DC voltage is set to the PN voltage correction coefficient.Type: GrantFiled: March 26, 2004Date of Patent: December 6, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideo Matsushiro, Mitsuo Kawaji, Tomohiro Sugimoto
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Patent number: 6958589Abstract: A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter. A PN voltage corrector calculates a ratio of the DC voltage detection value of the inverter obtained by the PN voltage detector to a predetermined DC voltage reference value of the inverter to thereby generate a PN voltage correction factor. A beat amount corrector calculates a fluctuation amount of the motor current from the motor current detection value obtained by the motor current detector and generates a reverse phase component of the motor current fluctuation amount. Thus, a small, light and low-cost inverter controller can be implemented.Type: GrantFiled: April 1, 2004Date of Patent: October 25, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsuo Kawaji, Hideo Matsushiro, Tomohiro Sugimoto
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Patent number: 6924618Abstract: An inverter controller for driving a motor includes a rectifier having a reactor, an inverter, a capacitor, a generator which generates a voltage command value for each phase of the motor, a detector which detects a DC voltage between the DC buses of the inverter, a first corrector which calculates a voltage correction coefficient by comparing the DC voltage with a predetermined DC reference voltage, a second corrector which corrects the voltage command value by multiplying the voltage command value and the voltage correction coefficient, a selector which selects either two-phase modulation or three-phase modulation as a modulation type, a computer that computes a carrier frequency, and a pulse width modulation controller which controls a pulse width modulation so that a value of a voltage to be applied to the motor equals to the corrected voltage command value, by using the selected modulation type and the selected carrier frequency.Type: GrantFiled: March 24, 2004Date of Patent: August 2, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideo Matsushiro, Tomohiro Sugimoto, Mitsuo Kawaji
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Patent number: 6879129Abstract: In a brushless motor control method and a brushless motor controller in accordance with the present invention, a rotor rotation position detection means detects the time of the intersection of a detected induced voltage and an induced voltage reference value. In addition, a motor speed calculation means calculates the rotation speed of a brushless motor on the basis of the interval of the intersection times detected by the rotor rotation position detection means. Furthermore, a speed control means outputs a duty factor index on the basis of the deviation between the command speed and the rotation speed of the brushless motor. Still further, a switching signal generation means outputs switching signals to groups of switching devices on the basis of the rotation speed and the duty factor index at the time of the intersection.Type: GrantFiled: March 28, 2002Date of Patent: April 12, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Tazawa, Kazushige Narazaki, Tomokuni Iijima, Hideo Matsushiro, Subrata Saha
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Publication number: 20040246641Abstract: An inverter control unit for motor driving includes a rectifier circuit for converting into a DC power a first AC power inputted from an AC power supply, which includes a diode bridge and a reactor connected to an AC input side or a DC output side of the diode bridge and having a small inductance, and an inverter for converting the DC power from the rectifier circuit into a second AC power so as to output the second AC power to a motor. Furthermore, a capacitor for absorbing regenerative energy of the motor, which has a small capacitance and an overvoltage protecting circuit whose impedance is lowered by overvoltage are connected between DC buses of the inverter.Type: ApplicationFiled: April 20, 2004Publication date: December 9, 2004Inventors: Tomohiro Sugimoto, Hideo Matsushiro, Mitsuo Kawaji, Akihiro Kyogoku
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Publication number: 20040232876Abstract: An inverter control device for driving a motor with small size, light weight and low cost is provided. The inverter control device generates PN voltage correction coefficient by dividing the reference DC voltage by the detected DC voltage, and corrects the voltage command of each phase by multiplying the voltage command of each phase obtained by the motor voltage command generator with the PN voltage correction coefficient output from the PN voltage corrector, thus resulting in the corrected motor voltage command. The inverter control device has, in generating PN voltage correction coefficient, a first mode in which the PN voltage correction coefficient is set to 1 when the DC voltage value is more than the reference DC voltage, and a second mode in which the value obtained by dividing the reference DC voltage by the detected DC voltage is set to the PN voltage correction coefficient.Type: ApplicationFiled: March 26, 2004Publication date: November 25, 2004Inventors: Hideo Matsushiro, Mitsuo Kawaji, Tomohiro Sugimoto
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Publication number: 20040232877Abstract: A reactor (5) having a predetermined small capacity is connected to a rectifier (2), and a capacitor (6) having a predetermined small capacity which is connected between DC bus lines of the inverter (3). A PN voltage corrector (10) calculates a ratio of the DC voltage detection value of the inverter obtained by the PN voltage detector (9) to a predetermined DC voltage reference value of the inverter (3) to thereby generate a PN voltage correction factor. A beat amount corrector (16) calculates a fluctuation amount of the motor current from the motor current detection value obtained by the motor current detector (15) and generates a reverse phase component of the motor current fluctuation amount. Thus, a small, light and low-cost inverter controller can be implemented.Type: ApplicationFiled: April 1, 2004Publication date: November 25, 2004Inventors: Mitsuo Kawaji, Hideo Matsushiro, Tomohiro Sugimoto
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Patent number: 6822417Abstract: A control apparatus of a synchronous reluctance motor includes a torque current correction unit (16) that generates a torque current command tracing a load torque so as to make the output torque of the motor coincide with the load torque. The control apparatus may further include a position and speed estimation unit (13) that estimates the position and speed based on three phase voltage equation to improve control performance in a voltage saturation state.Type: GrantFiled: May 11, 2004Date of Patent: November 23, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsuo Kawaji, Hideo Matsushiro, Keizo Matsui
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Publication number: 20040228151Abstract: An inverter control device for driving a motor with small size, light weight and low cost is provided. The inverter control device includes a first motor voltage command corrector that corrects a voltage command of each phase by multiplying the each phase voltage command by a PN voltage correction coefficient, and a second motor voltage command corrector that corrects again the each phase voltage command once corrected by the first motor voltage command corrector, only when any one of the phase voltage commands corrected by the first motor voltage command corrector is larger than the inverter DC voltage, by multiplying the voltage command of each phase corrected by the first motor voltage command corrector by the inverter DC voltage value, and dividing the product of the multiplication by the maximum value of the phase voltage commands corrected by the first motor voltage command corrector.Type: ApplicationFiled: March 26, 2004Publication date: November 18, 2004Inventors: Hideo Matsushiro, Mitsuo Kawaji, Tomohiro Sugimoto, Hideki Nakata, Mitsuo Ueda
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Publication number: 20040217728Abstract: A reactor (11) having a predetermined small capacity is connected to a rectifier (2), and a capacitor (12) having a predetermined small capacity is connected between DC bus lines of the inverter (3), so that a small, light and low-cost inverter controller for driving a motor can be implemented, and even when an inverter DC voltage largely fluctuates and it is difficult to drive the motor, the motor can be kept driving by operating the inverter such that a voltage applied to the motor may stay constant by a motor voltage command corrector (17) which generates a motor voltage command correction value of the motor.Type: ApplicationFiled: March 30, 2004Publication date: November 4, 2004Inventors: Mitsuo Kawaji, Hideo Matsushiro, Tomohiro Sugimoto
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Publication number: 20040207360Abstract: An inverter controller for driving a motor includes a rectifier having a reactor, an inverter, a capacitor, a generator which generates a voltage command value for each phase of the motor, a detector which detects a DC voltage between the DC buses of the inverter, a first corrector which calculates a voltage correction coefficient by comparing the DC voltage with a predetermined DC reference voltage, a second corrector which corrects the voltage command value by multiplying the voltage command value and the voltage correction coefficient, a selector which selects either two-phase modulation or three-phase modulation as a modulation type, a computer that computes a carrier frequency, and a pulse width modulation controller which controls a pulse width modulation so that a value of a voltage to be applied to the motor equals to the corrected voltage command value, by using the selected modulation type and the selected carrier frequency.Type: ApplicationFiled: March 24, 2004Publication date: October 21, 2004Inventors: Hideo Matsushiro, Tomohiro Sugimoto, Mitsuo Kawaji
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Publication number: 20040201358Abstract: A control apparatus of a synchronous reluctance motor includes a torque current correction unit (16) that generates a torque current command tracing a load torque so as to make the output torque of the motor coincide with the load torque. the control apparatus may further include a position and speed estimation unit (13) that estimates the position and speed based on three phase voltage equation to improve control performance in a voltage saturation state.Type: ApplicationFiled: May 11, 2004Publication date: October 14, 2004Inventors: Mitsuo Kawaji, Hideo Matsushiro, Keizo Matsui
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Publication number: 20040124807Abstract: In a motor control apparatus of the present invention, a control section which receives an input voltage to an inverter circuit, a motor current flowing to a brushless motor and a motor current command value indicating the value of a current required to flow to the inverter circuit, and controls the inverter circuit by maintaining a phase of the voltage applied to the brushless motor when the value of the input voltage to the inverter circuit is smaller than the value of a voltage required to be applied to the brushless motor.Type: ApplicationFiled: December 10, 2003Publication date: July 1, 2004Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Hideki Nakata, Mitsuo Ueda, Hideo Matsushiro, Masanori Ogawa, Mitsuo Kawaji, Tomohiro Sugimoto
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Patent number: 6512341Abstract: The invention provides an motor drive apparatus comprising a detector for detecting a terminal voltage in a non-energized phase and a detector for detecting a DC voltage applied to the main line of an inverter. The rotation of the brushless motor is controlled by specifying the inverter circulating current period from the terminal voltage and the DC voltage and calculating the magnetic pole position of the rotor from the terminal voltage after the end of the inverter circulating current period and a waveform of the terminal voltage predetermined from the characteristics of the brushless motor. As a result, the brushless motor can be rotated stably throughout a wide revolution range from low to high speeds.Type: GrantFiled: July 11, 2001Date of Patent: January 28, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideo Matsushiro, Keizo Matsui, Kazushige Narazaki, Toru Tazawa
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Publication number: 20020140395Abstract: In a brushless motor control method and a brushless motor controller in accordance with the present invention, a rotor rotation position detection means detects the time of the intersection of a detected induced voltage and an induced voltage reference value. In addition, a motor speed calculation means calculates the rotation speed of a brushless motor on the basis of the interval of the intersection times detected by the rotor rotation position detection means. Furthermore, a speed control means outputs a duty factor index on the basis of the deviation between the command speed and the rotation speed of the brushless motor. Still further, a switching signal generation means outputs switching signals to groups of switching devices on the basis of the rotation speed and the duty factor index at the time of the intersection.Type: ApplicationFiled: March 28, 2002Publication date: October 3, 2002Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Tazawa, Kazushige Narazaki, Tomokuni Iijima, Hideo Matsushiro, Subrata Saha
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Patent number: 6362581Abstract: Device and method are provided for starting a brushless motor easily enables reliable motor starting, and prevents overcurrent supply when starting the motor. The permanent magnet rotor is firstly positioned by supplying current from one phase to another phase (or the other two phases) before starting the motor. The motor is then started by controlling the switch-operation of the switching devices of the inverter based on output signals from Hall ICs which detect the pole position of the magnet rotor. Thus positioning the rotor before starting motor ensures output of stable Hall IC signals, and enables the brushless motor to be started without affection of electrical noise or the slight moving of the magnet rotor.Type: GrantFiled: June 7, 1999Date of Patent: March 26, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideo Matsushiro, Takahito Chinomi
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Publication number: 20020030462Abstract: The invention provides an motor drive apparatus comprising a detector for detecting a terminal voltage in a non-energized phase and a detector for detecting a DC voltage applied to the main line of an inverter. The rotation of the brushless motor is controlled by specifying the inverter circulating current period from the terminal voltage and the DC voltage and calculating the magnetic pole position of the rotor from the terminal voltage after the end of the inverter circulating current period and a waveform of the terminal voltage predetermined from the characteristics of the brushless motor. As a result, the brushless motor can be rotated stably throughout a wide revolution range from low to high speeds.Type: ApplicationFiled: July 11, 2001Publication date: March 14, 2002Inventors: Hideo Matsushiro, Keizo Matsui, Kazushige Narazaki, Toru Tazawa