Company Filing History:
3 out of 42,485 
1 out of 195 
Years Active: 1982-1989
Title: The Innovations of Sadahiko Niwa
Introduction
Sadahiko Niwa is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of electric machines, holding a total of 3 patents. His work focuses on enhancing the efficiency and reliability of electric systems.
Latest Patents
One of Niwa's latest patents is a variable-speed generator/motor system. This system comprises a generator/motor with primary and secondary windings installed on the motor rotor, which is coupled to a prime mover or load. The design includes a main circuit interposed between a power system and the primary winding, along with an excitation circuit featuring a frequency converter. This setup allows for stable operation during disturbances in the power system by maintaining a consistent frequency signal.
Another significant patent is a method and apparatus for diagnosing overheating in gas-cooled electric machines. This invention addresses the challenges posed by organic insulating materials that decompose at high temperatures. The apparatus enables gas extraction from the machine's interior, detects particle density, and analyzes the composition of the decomposed materials. This innovative approach helps identify overheating regions and positions within the electric machine.
Career Highlights
Throughout his career, Sadahiko Niwa has worked with prominent companies such as Hitachi, Ltd. and Kansai Electric Power Co., Inc. His experience in these organizations has allowed him to develop and refine his inventions, contributing to advancements in electric machine technology.
Collaborations
Niwa has collaborated with notable coworkers, including Kiyoshi Narato and Hiroto Nakagawa. Their combined expertise has fostered innovation and progress in their respective fields.
Conclusion
Sadahiko Niwa's contributions to electric machine technology through his patents and collaborations highlight his role as a significant inventor in the industry. His work continues to influence advancements in the field, ensuring more efficient and reliable electric systems.
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.