Hitachi, Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Hitachi Car Engineering Co., Ltd.

Hitachi Appliances, Inc

Hitachi Information & Control Solutions, Ltd.

Renesas Electronics Corporation

Hitachi Keiyo Engineering Co., Ltd.

Hitachi Home and Life Solutions, Inc.

Tsunehiro Endo

Takahiro Suzuki

Yoshitaka Iwaji

Kiyoshi Sakamoto

Kazuaki Tobari

Kazuo Tahara

Kunio Miyashita

Haruo Koharagi

Yoshitaro Ishii

Fumio Jyoraku

Hidefumi Shirahama

Hisanori Toyoshima

Koujirou Yamashita

Hiroshi Fujii

Daisuke Maeda

Yasuo Notohara

Yuhachi Takakura

Syuji Watanabe

Daigo Kaneko

Wakichiro Hishi

Kohichi Saito

Yukio Kawabata

Tomofumi Okubo

Motoo Futami

Seiji Ishida

Yozo Nakamura

Shigehisa Aoyagi

Mitsuru Nakamura

Tatsuo Ando

Yuzo Kadomukai

Hiroyuki Hasegawa

Hiromi Inaba

Hiroaki Hata

Junnosuke Nakatsugawa

Kenji Sakurai

Chikara Tanaka

Mitsuhiro Mishima

Yoshiaki Kurita

Yoshiki Ito

Hideki Miyazaki

Kinya Nakatsu

Masahiro Iwamura

Akihiko Emori

Ryoso Masaki

Kazuo Kato

Hiroyuki Tomita

Toshiyuki Innami

Toshiaki Okuyama

Takeshi Abe

Keiichi Mashino

Toshiyuki Ajima

Noboru Akiyama

Haruo Miura

Akira Yamazaki

Masashi Kitamura

Yasuo Fukushima

Keijiro Sakai

Masahiro Hiraga

Naohiko Takahashi

Houng Joong Kim

Akira Arai

Junya Kaneda

Koichi Suda

Kazuki Takahashi

Makoto Ishii

Ikuo Yamato

Norinaga Suzuki

Kenji Nandoh

Naoyuki Tanaka

Kenichi Iizuka

Kouzou Watanabe

Yoshiyuki Taguchi

Yoshimi Sakurai

Shoichi Ito

Tomoyuki Someya

Junji Kato

Hisao Suka

Kou Ajima

Toru Inoue

Hajime Uematsu

Tadao Shimotsu

Mitsuhisa Kawamata

Hiroyuki Hanei

Naoto Ohnuma

Noriaki Yamada

Masaya Taniguchi

Hiroshi Maruyama

Atusi Hosokawa

Yoshiaki Ajima

Minoru Yoshihara

Hiroyuki Benya

Yuji Mori

Shigeru Kishi

Shizuo Takahashi

Tsuyoshi Sasaki

Humio Tazima

Sigeru Machida

Yoshiki Itou

Atsushi Okuyama

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.

Apparatus and method for driving synchronous motor

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.

Semiconductor integrated circuit, PWM signal output device, and power conversion control apparatus

A converter includes a converter circuithaving 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.

Converter and power converter that becomes it with the converter

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&#x2212;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&#x2212;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.

Vector controller for a permanent magnet motor and inverter module

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.

Motor controller, washing machine, air conditioner and electric oil pump

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.

Driving apparatus and driving system for electric motor

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.

Vector controller for permanent magnet synchronous motor

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.

Vector controller for a permanent magnet synchronous motor, inverter module, and permanent magnet synchronous motor constant display system

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.

Field weakening vector controller for permanent magnet synchronous motor and control module

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.

Control system for permanent magnet synchronous motor and module

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.

System and method for driving synchronous motor

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.

Motor drive device that combined charge controller

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 &#x394;Idcpand &#x394;Idcpon the positive side and two current values &#x394;Idcnand &#x394;Idcnon 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 &#x394;Idcp&#x2192;&#x394;Idcpand &#x394;Idcp&#x2192;&#x394;Idcp

Synchronous motor driving apparatus

Growing community of inventors

Hitachiota, Japan

Tsunehiro Endo