Company Filing History:
6 out of 886 
3 out of 309 
1 out of 104 
Years Active: 1980-2000
Title: The Innovative Contributions of Herbert Stemmler
Introduction
Herbert Stemmler is a notable inventor based in Kirchdorf, Switzerland. He has made significant contributions to the field of electrical engineering, particularly in the area of reactive power generation and low-noise operation of electrical machines. With a total of 12 patents to his name, Stemmler's work has had a profound impact on the industry.
Latest Patents
One of Stemmler's latest patents is a method and apparatus for generating and injecting reactive power into an AC grid system. This innovative method involves producing a compensation voltage that is phase-shifted with respect to the current in the line, which is then injected directly into the line. This approach simplifies compensation by utilizing a DC voltage converted through an inverter made of gate turn-off power semiconductors.
Another significant patent focuses on the low-noise operation of machines fed by a pulse inverter. This invention computes the amplitudes and frequencies of harmonics in the inverter output voltages. By adjusting modulation parameters, the frequency spectrum can be optimized, eliminating harmonics that may excite stator resonances. This method ensures that the fundamental oscillation and operating point of the machine remain unaffected while reducing noise levels and improving sound quality.
Career Highlights
Throughout his career, Herbert Stemmler has worked with several prominent companies, including BBC Brown, Boveri & Company, Limited, and Asea Brown Boveri Inc. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in electrical engineering.
Collaborations
Stemmler has collaborated with notable professionals in his field, including Peter Steimer and Bjorn Odegard. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.
Conclusion
Herbert Stemmler's contributions to electrical engineering through his patents and collaborations have significantly advanced the industry. His innovative methods for reactive power generation and low-noise operation of machines demonstrate his commitment to improving technology and enhancing performance.