1
Noboru Azusawa: Control system for commutatorless motor. Hitachi, Craig & Antonelli, June 2, 1981: US04271385 (28 worldwide citation)

A synchronous motor having a polyphase armature winding and a field winding is driven by a frequency converter. A position signal associated with the rotational position of the synchronous motor is adapted to be shifted in phase by the maximum of 180.degree. to the advance and lag side by a position ...


2
Noboru Azusawa, Hisayoshi Shiraishi: Pulse width modulation pulse generator. Hitachi, Antonelli Terry & Wands, December 9, 1986: US04628475 (27 worldwide citation)

A modulating wave signal whose phase abruptly changes is compared with a carrier signal to generate a pulse width modulation pulse. The carrier signal is a sine wave signal having a frequency n times as high as that of the modulating signal and synchronized with the modulating signal. A phase of the ...


3
Noboru Azusawa, Tadahiko Hashimoto, Hisayoshi Shiraishi, Yoshiharu Nagae: Liquid crystal projection display. Hitachi, Antonelli Terry Stout & Kraus, August 28, 1990: US04952034 (24 worldwide citation)

The liquid crystal is written with a laser beam. The laser beam generated by a laser source is applied through an optical control unit such as galvanometer mirrors to the liquid crystal. The intensity of the laser beam applied to the liquid crystal is controlled by a laser beam intensity varying uni ...


4
Tadashi Okamoto, Noboru Azusawa: Multiplex control system with programmable logic for controlling signal transfer between controllers and one or more controlled systems. Hitachi, Antonelli Terry Stout & Kraus, March 5, 1991: US04998194 (23 worldwide citation)

A multiplex control system has controllers for delivering control data to at least one common controlled system, and a multiplex mode switching device which is constructed to permit the logic for selecting the control data to be changeably set therein. The mode selection logic of the multiplex mode ...


5
Kenji Kubo, Rached Dhaouadi, Masahiro Tobise, Noboru Azusawa: Motor speed controller for suppressing shaft torsion vibration. Hitachi, Kenyon & Kenyon, August 13, 1996: US05545957 (21 worldwide citation)

A motor controller includes a shaft torsion vibration estimator for estimating a shaft torsion vibration between a motor and a mechanical load and a shaft torque estimator for estimating a shaft torque acting upon a motor shaft, wherein a vibration in a mechanical load driving system is suppressed b ...


6
Akihiro Ohhashi, Tadashi Okamoto, Makoto Tachikawa, Takeshi Katoh, Noboru Azusawa, Junichi Hamano, Hitoshi Saitoh: Apparatus and method for controlling a system process. Hitachi, Hitachi Information and Control Systems, Antonelli Terry Stout & Kraus, December 3, 1996: US05581759 (11 worldwide citation)

A process controlling method and apparatus which uses a flowchart language program and ladder programs with an intermediate register accessible using the same name by both the flowchart language program and the ladder programs. Each ladder program defines the operation of a machine, including an int ...


7
Noboru Azusawa: Control system for commutatorless motor driven through frequency converter. Hitachi, Craig and Antonelli, April 14, 1981: US04262241 (11 worldwide citation)

A control system for a commutatorless motor comprises a frequency converter which includes two graetz-connected thyristor converters and D.C. lines interconnecting the converters, between an A.C. motor and an A.C. power supply. Motoring operation and regenerating operation are selectively effected b ...


8
Akihiro Ohhashi, Tadashi Okamoto, Makoto Tachikawa, Takeshi Katoh, Noboru Azusawa, Junichi Hamano, Hitoshi Saitoh: Apparatus and method for controlling a system process. Hitachi, Hitachi Information & Control Systems, Antonelli Terry Stout & Kraus, October 11, 1994: US05355482 (10 worldwide citation)

A process controlling method uses a flowchart language program and ladder programs with an intermediate register to be accessible with the same name by both the flowchart language program and the ladder programs. Each ladder program defines the operation of a machine, including an interlock conditio ...


9
Noboru Azusawa, Hisayoshi Shiraishi: Apparatus and method for controlling a thyristor converter in response to change in mode of load current. Hitachi, Antonelli Terry & Wands, February 18, 1986: US04571668 (8 worldwide citation)

A control apparatus for a thyristor converter which supplies electric power to a load generating a changeable electromotive force, wherein, in response to a load current being changed from an intermittent load current mode to a continuous load current mode, an actual main circuit constant of the loa ...


10
Noboru Azusawa, Tadahiko Hashimoto, Hisayoshi Shiraishi, Yoshiharu Nagae: Liquid crystal projection display having laser intensity varied according to beam change-of-axis speed. Hitachi, Antonelli Terry & Wands, March 7, 1989: US04810064 (7 worldwide citation)

The liquid crystal is written with a laser beam. The laser beam generated by a laser source is applied through an optical control unit such as galvanometer mirrors to the liquid crystal. The intensity of the laser beam applied to the liquid crystal is controlled by a laser beam intensity varying uni ...