Patents by Inventor Tsunehiro Endo
Tsunehiro Endo 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: 8035330Abstract: The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.Type: GrantFiled: October 5, 2010Date of Patent: October 11, 2011Assignees: Hitachi, Ltd., Hitachi Information & Control Solutions, Ltd.Inventors: Daisuke Maeda, Tsunehiro Endo, Hidefumi Shirahama, Kenji Sakurai, Hiroyuki Hasegawa, Mitsuhiro Mishima
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Publication number: 20110182096Abstract: Provided is a control technique of a PWM conversion type power converter capable of compensating for a voltage error due to voltage drop mainly at a switching element and managing a switching time of a PWM signal at the same time, and capable of suppressing increase/decrease of software operation load and addition of a hardware circuit to the minimum. A semiconductor integrated circuit having a PWM signal generating unit which generates a PWM signal is provided with a PWM timer unit including a counter counting a pulse width of a pulse signal inputted from the outside with delay from a PWM signal, a register loading a counter value of the counter in synchronization with the PWM signal, and an A/D converting unit converting an analog signal serving as a source signal of the pulse signal inputted from the outside to a digital signal.Type: ApplicationFiled: April 5, 2011Publication date: July 28, 2011Inventors: Takahiro Suzuki, Yasuo Notohara, Tsunehiro Endo, Yuji Mori
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Patent number: 7944720Abstract: Provided is a control technique of a PWM conversion type power converter capable of compensating for a voltage error due to voltage drop mainly at a switching element and managing a switching time of a PWM signal at the same time, and capable of suppressing increase/decrease of software operation load and addition of a hardware circuit to the minimum. A semiconductor integrated circuit having a PWM signal generating unit which generates a PWM signal is provided with a PWM timer unit including a counter counting a pulse width of a pulse signal inputted from the outside with delay from a PWM signal, a register loading a counter value of the counter in synchronization with the PWM signal, and an A/D converting unit converting an analog signal serving as a source signal of the pulse signal inputted from the outside to a digital signal.Type: GrantFiled: August 14, 2008Date of Patent: May 17, 2011Assignee: Renesas Electronics CorporationInventors: Takahiro Suzuki, Yasuo Notohara, Tsunehiro Endo, Yuji Mori
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Publication number: 20110018485Abstract: The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.Type: ApplicationFiled: October 5, 2010Publication date: January 27, 2011Inventors: Daisuke MAEDA, Tsunehiro ENDO, Hidefumi SHIRAHAMA, Kenji SAKURAI, Hiroyuki HASEGAWA, Mitsuhiro MISHIMA
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Patent number: 7839113Abstract: The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.Type: GrantFiled: January 25, 2008Date of Patent: November 23, 2010Assignees: Hitachi, Ltd., Hitachi Information & Control Solutions, Ltd.Inventors: Daisuke Maeda, Tsunehiro Endo, Hidefumi Shirahama, Kenji Sakurai, Hiroyuki Hasegawa, Mitsuhiro Mishima
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Patent number: 7839663Abstract: A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in parallel to the DC side of the converter circuit and a current detector provided in a condenser circuit to control a condenser current flowing through the smoothing condenser to be a set value. The condenser current is controlled to be the set value (e.g. zero) to thereby reduce the capacity of the smoothing condenser and make the converter small.Type: GrantFiled: December 16, 2008Date of Patent: November 23, 2010Assignee: Hitachi Appliances, Inc.Inventors: Takahiro Suzuki, Yoshitaka Iwaji, Tsunehiro Endo, Yasuo Notohara, Yoshiaki Kurita, Tatsuo Ando, Chikara Tanaka
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Patent number: 7821223Abstract: In a system in which current is detected in an inexpensive manner or in a system in which a position detector is omitted, the present invention provides a high-efficiency vector controller for a permanent magnet motor that can minimize current at the same torque even when there is setting error (R?R*) in resistance. Even when a current value commanded for the d-axis is set to zero, a virtual inductance value calculated from a detected q-axis current value is used for output voltage value calculation and phase error estimation calculation; so even if there is setting error (R?R*) in resistance, current can be minimized at the same torque and thereby the present invention can provide a high-efficiency vector controller for a permanent magnet motor.Type: GrantFiled: June 28, 2007Date of Patent: October 26, 2010Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., LtdInventors: Kazuaki Tobari, Tsunehiro Endo, Kiyoshi Sakamoto, Daisuke Maeda, Shigehisa Aoyagi
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Patent number: 7619385Abstract: A motor controller capable of suppressing a large speed change generated at the time of changeover from a synchronous operation mode to a position feedback operation mode and implementing even acceleration characteristics regardless of the load torque by estimating a torque of a permanent magnet motor in the synchronous operation mode for driving the permanent magnet motor and setting an initial value of a current command value in a position sensor-less operation mode on the basis of information of the torque estimated value.Type: GrantFiled: July 28, 2006Date of Patent: November 17, 2009Assignees: Hitachi, Ltd., Hitachi Industrial Equipment Systems, Co., Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Takahiro Suzuki, Tsunehiro Endo, Kazuaki Tobari, Daigo Kaneko, Daisuke Maeda, Akira Yamazaki
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Patent number: 7602138Abstract: An apparatus for controlling the drive of an electric motor, having a current detector for detecting the current through an externally connected electric motor; a controller for generating a control signal to control the electric motor on the basis of the current detected by the current detector and the speed command for specifying the rotational speed of the electric motor; wherein the apparatus includes a load estimator for estimating the mechanical load condition associated with the electric motor on the basis of the current detected by the current detector and the speed command, and the controller controls the electric motor current on the basis of the detected current, the speed command and the estimated load condition.Type: GrantFiled: September 27, 2006Date of Patent: October 13, 2009Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Daigo Kaneko, Takahiro Suzuki, Tsunehiro Endo, Kazuaki Tobari, Hajime Uematsu
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Publication number: 20090135630Abstract: A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in parallel to the DC side of the converter circuit and a current detector provided in a condenser circuit to control a condenser current flowing through the smoothing condenser to be a set value. The condenser current is controlled to be the set value (e.g. zero) to thereby reduce the capacity of the smoothing condenser and make the converter small.Type: ApplicationFiled: December 16, 2008Publication date: May 28, 2009Inventors: Takahiro Suzuki, Yoshitaka Iwaji, Tsunehiro Endo, Yasuo Notohara, Yoshiaki Kurita, Tatsuo Ando, Chikara Tanaka
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Patent number: 7528568Abstract: A vector controller for a permanent magnet synchronous motor according to the present invention has a motor constant identifying unit for identifying motor constants of the permanent magnet synchronous motor, which is connected to an electric power converter in the vector controller, by using a second d-axis current command value, a second q-axis current command value, a detected output current of the electric power converter, and motor constant settings. The vector controller uses the motor constants identified by the motor constant identifying unit in vector control calculation so as to control the driving of the permanent magnet synchronous motor. Thereby, the vector controller achieves torque control with high accuracy and superior responsiveness.Type: GrantFiled: August 11, 2006Date of Patent: May 5, 2009Assignee: Hitachi, Ltd.Inventors: Kazuaki Tobari, Tsunehiro Endo, Yoshiki Ito
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Patent number: 7521887Abstract: A vector controller for a permanent magnet synchronous motor uses current command values and detected currents of the d-axis and q-axis, a calculated frequency, and motor constant settings to control the output voltage of a power converter; the motor constants are identified by use of active or reactive power obtained from the output voltage and detected current of the power converter, the calculated frequency, and the detected current immediately before or during an actual operation.Type: GrantFiled: December 1, 2006Date of Patent: April 21, 2009Assignee: Hitachi, Ltd.Inventors: Kazuaki Tobari, Tsunehiro Endo
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Publication number: 20090066384Abstract: Provided is a control technique of a PWM conversion type power converter capable of compensating for a voltage error due to voltage drop mainly at a switching element and managing a switching time of a PWM signal at the same time, and capable of suppressing increase/decrease of software operation load and addition of a hardware circuit to the minimum. A semiconductor integrated circuit having a PWM signal generating unit which generates a PWM signal is provided with a PWM timer unit including a counter counting a pulse width of a pulse signal inputted from the outside with delay from a PWM signal, a register loading a counter value of the counter in synchronization with the PWM signal, and an A/D converting unit converting an analog signal serving as a source signal of the pulse signal inputted from the outside to a digital signal.Type: ApplicationFiled: August 14, 2008Publication date: March 12, 2009Inventors: TAKAHIRO SUZUKI, Yasuo Notohara, Tsunehiro Endo, Yuji Mori
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Patent number: 7471525Abstract: A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in parallel to the DC side of the converter circuit and a current detector provided in a condenser circuit to control a condenser current flowing through the smoothing condenser to be a set value. The condenser current is controlled to be the set value (e.g. zero) to thereby reduce the capacity of the smoothing condenser and make the converter small.Type: GrantFiled: August 30, 2005Date of Patent: December 30, 2008Assignee: Hitachi Appliances, Inc.Inventors: Takahiro Suzuki, Yoshitaka Iwaji, Tsunehiro Endo, Yasuo Notohara, Yoshiaki Kurita, Tatsuo Ando, Chikara Tanaka
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Patent number: 7443120Abstract: A field weakening vector controller is disclosed which calculates a d-axis current command value for a power converter to drive a permanent magnet synchronous motor. The field weakening vector controller includes a stabilization calculator, a d-axis current command calculator, a q-axis current command calculator, and a phase calculator. The d-axis current command calculator corrects the d-axis current command value, while the stabilization calculator calculates a product of the phase error and the d-axis command value. The q-axis current command calculator corrects the q-axis current command value using this product.Type: GrantFiled: October 19, 2006Date of Patent: October 28, 2008Assignee: Hitachi, Ltd.Inventors: Kazuaki Tobari, Daisuke Maeda, Tsunehiro Endo
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Publication number: 20080203962Abstract: The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.Type: ApplicationFiled: January 25, 2008Publication date: August 28, 2008Inventors: Daisuke Maeda, Tsunehiro Endo, Hidefumi Shirahama, Kenji Sakurai, Hiroyuki Hasegawa, Mitsuhiro Mishima
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Patent number: 7388341Abstract: A vector control system for a permanent magnet synchronous motor, using a current control equivalent output value, a frequency instruction value, a current detection value, an inference phase error value, and a motor constant, identifies a motor resistance equivalent or a resistance setting error equivalent. Next, the vector control unit, using the identified value, corrects a set value R* equivalent of a voltage instruction calculation unit and a n inference phase error calculation unit. Thereby, a vector control system for a permanent magnet synchronous motor can realize a robust control characteristic for changing of a resistance constant of a motor in a low rotation speed area under position sensor-less control. Further, a vector control system for a permanent magnet synchronous motor can be applied in common in a system performing inexpensive current detection.Type: GrantFiled: August 17, 2005Date of Patent: June 17, 2008Assignee: Hitachi, Ltd.Inventors: Kazuaki Tobari, Kiyoshi Sakamoto, Tsunehiro Endo, Yoshitaka Iwaji, Yukio Kawabata, Shigehisa Aoyagi
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Patent number: 7342378Abstract: A driving apparatus of a synchronous motor fixes all the switching devices of an inverter at OFF in accordance with a value of an all-OFF control pulse signal outputted by a pulse generator. A motor current keeps flowing through free wheel diodes for a predetermined period even after all the switching devices shift to the OFF state. Therefore, pulse generator changes an induced voltage detection signal to an H (high) level after the passage of the time in which a motor current drops down to zero. A terminal voltage of the motor is taken in to acquire an induced voltage and a rotor position is estimated.Type: GrantFiled: August 17, 2006Date of Patent: March 11, 2008Assignee: Hitachi, Ltd.Inventors: Kiyoshi Sakamoto, Tsunehiro Endo, Hidefumi Shirahama, Yoshiaki Ajima
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Patent number: 7332882Abstract: A voltage detector is connected to a connection terminal connected to one phase of an AC output of an inverter through a diode. A removable charge power supply is connected to said connection terminal and another connection terminal. A charge-power-supply connection judging circuit judges whether the charge power supply is or isn't connected, based on a charge power supply voltage detected by a voltage detector. A mode change control circuit outputs switch signal by the result of said judgment. By receiving this switch signal, the inverter controller switches the operation of the inverter between the Motor Drive mode or the Battery Charge mode. Thereby, a motor drive device detects a connecting status of an external charge power supply and steadily switches the operation of the inverter between the Motor Drive mode or the Battery Charge mode.Type: GrantFiled: July 27, 2006Date of Patent: February 19, 2008Assignee: Hitachi, Ltd.Inventors: Shigehisa Aoyagi, Tsunehiro Endo, Hidefumi Shirahama, Yoshiki Ito
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Patent number: 7276876Abstract: A synchronous motor driving apparatus having a power converter which applies AC variable voltages having variable frequency to a synchronous motor includes a pulsating current application unit for applying pulsating current to the synchronous motor and a magnetic pole position presumption unit. The magnetic pole position presumption unit detects two current values ?Idcp1 and ?Idcp2 on the positive side and two current values ?Idcn1 and ?Idcn2 on the negative side of the pulsating current and presumes the magnetic pole position of the synchronous motor on the basis of difference between change rates of ?Idcp1??Idcp2 and ?Idcp1??Idcp2.Type: GrantFiled: August 18, 2005Date of Patent: October 2, 2007Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Daigo Kaneko, Yoshitaka Iwaji, Kiyoshi Sakamoto, Tsunehiro Endo, Tomofumi Okubo