Location History:
- Hitachi, JP (2001 - 2003)
- Chiyoda-ku, JP (2007)
- Hitachinaka, JP (1999 - 2008)
Company Filing History:
14 out of 42,485 
1 out of 832,680 Years Active: 1999-2008
Title: Innovations of Yukio Kawabata
Introduction
Yukio Kawabata is a prominent inventor based in Hitachinaka, Japan. He holds a total of 15 patents, showcasing his significant contributions to the field of engineering and technology. His work primarily focuses on control systems for motors, particularly permanent magnet synchronous motors.
Latest Patents
One of his latest patents is a control system for permanent magnet synchronous motors. This vector control system utilizes a current control equivalent output value, a frequency instruction value, a current detection value, an inference phase error value, and a motor constant. It identifies a motor resistance equivalent or a resistance setting error equivalent. The vector control unit then uses this identified value to correct a set value R* equivalent of a voltage instruction calculation unit and an inference phase error calculation unit. This innovation allows for robust control characteristics, especially in low rotation speed areas under position sensor-less control.
Another notable patent is the synchronous motor drive unit and its driving method. This invention employs a rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave, with multiple periods within one period of the electrical angle of a motor. The motor is energized at each position for a specified length of time upon startup, using multiple electrical angles corresponding to the multiple candidate absolute angles obtained from the rotary sensor signal. This method determines the electrical angle at which the motor acceleration becomes maximum as the absolute angle. During operation, the phase difference between the motor's counter electromotive voltage and the control phase is directly computed from the motor parameters, sensed current, voltage command, and angle speed to correct any shifted position.
Career Highlights
Yukio Kawabata has worked with notable companies, including Hitachi, Ltd. His experience in these organizations has contributed to his expertise and the development of his innovative patents.
Collaborations
He has collaborated with esteemed colleagues such as Yasuo Notohara and Makoto Ishii, further enhancing his work and contributions to the field.
Conclusion
Yukio Kawabata's innovative patents and career achievements highlight his significant impact on motor control technology. His work continues to influence advancements in engineering and technology.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.