Company Filing History:
Years Active: 1988-1989
Title: The Innovations of Pekka Nummi
Introduction
Pekka Nummi is a notable inventor based in Nurmijarvi, Finland. He has made significant contributions to the field of electrical engineering, particularly in the area of voltage regulation for inverters. With a total of 2 patents to his name, Nummi's work has had a considerable impact on the efficiency and performance of electrical systems.
Latest Patents
Nummi's latest patents include a method and apparatus for voltage regulation in three-phase inverters. This innovation focuses on regulating the control voltage of an inverter that supplies an alternating current (a.c.) motor. The system utilizes semiconductor switches and measures the output voltage of each inverter phase to improve the curve shapes of the inverter output through feedback. The control voltage is adjusted by a voltage regulator, which derives its output from an actual value voltage formed from the inverter's output and a reference voltage.
Another significant patent involves a method and apparatus for controlling a braking resistor in a direct current (d.c.) circuit of a frequency converter. This invention rectifies mains voltage using a first rectifier bridge connected to a three-phase mains supply to create an actual value voltage. The system compares this actual value voltage with a reference voltage and operates a switch in series with the braking resistor to ensure it conducts when necessary.
Career Highlights
Pekka Nummi is currently employed at Kone Elevator GmbH, where he continues to innovate and develop new technologies. His work at Kone Elevator GmbH has allowed him to apply his expertise in electrical engineering to enhance the performance of elevator systems.
Collaborations
Throughout his career, Nummi has collaborated with several talented individuals, including Matti J Kahkipuro and Urpo Sten. These collaborations have contributed to the advancement of his projects and the successful implementation of his inventions.
Conclusion
Pekka Nummi's contributions to the field of electrical engineering through his patents and work at Kone Elevator GmbH highlight his innovative spirit and dedication to improving technology. His inventions in voltage regulation and braking systems demonstrate the importance of continuous advancement in engineering practices.