Company Filing History:

3 out of 3,781

Renesas Technology Corp.

Hitachi Ulsi Systems Co., Ltd.

patents

4. 1 out of 35

Hitachi Tohbu Semiconductor, Ltd.

patents

5. 2 out of 832,680

Other

patents

where one patent can have more than one assignee

Years Active: 2002-2006

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8 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7119508 - Drive control device for direct current motor, rotation drive system for direct current motor and semiconductor integrated circuit for driving coil (2006-10-10),

2. 7071640 - Rotation drive control circuit of multiphases direct current motor and the start-up method thereof (2006-07-04),

3. 6900604 - Drive control system for sensor-less motor (2005-05-31),

4. 6801382 - Magnetic disk storage apparatus (2004-10-05),

5. 6771033 - Drive control system for sensor-less motor (2004-08-03),

6. 6563286 - Semiconductor integrated circuit for brushless motor drive control and brushless motor drive control apparatus (2003-05-13),

7. 6344721 - Semiconductor integrated circuit for brushless motor drive control and brushless motor drive control apparatus (2002-02-05),

8. 6340873 - Semiconductor integrated circuit for brushless motor drive control and brushless motor drive control apparatus (2002-01-22),

Title: Innovations by Kunihiro Kawauchi

Introduction

Kunihiro Kawauchi is a notable inventor based in Fujioka, Japan. He has made significant contributions to the field of direct current motor control systems. With a total of 8 patents to his name, Kawauchi's work has advanced the technology used in motor drive systems.

Latest Patents

Kawauchi's latest patents include a drive control device for direct current motors and a rotation drive system for direct current motors. His innovations focus on high-accuracy rotation drive control while detecting currents flowing into the coils without the need for shunt resistors. The system utilizes PWM control to drive output MOS transistors, allowing for efficient motor operation. Another patent details a rotation drive control circuit for multiphase direct current motors, which enhances start-up methods by detecting the polarity and levels of induced voltages in de-energized phases.

Career Highlights

Throughout his career, Kawauchi has worked with prominent companies such as Renesas Technology Corporation and Hitachi, Ltd. His experience in these organizations has contributed to his expertise in motor control technologies.

Collaborations

Kawauchi has collaborated with notable colleagues, including Yasuhiko Kokami and Toshiyuki Tsunoda. Their combined efforts have furthered advancements in the field of motor control systems.

Conclusion

Kunihiro Kawauchi's contributions to direct current motor technology demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving motor control systems, making him a significant figure in the field of engineering.

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