Location History:
- Neyagawa, JA (1977)
- Neyagawa, JP (1978)
- Ikomashi, JP (1983)
- Nara, JP (1997 - 2007)
- Ikoma, JP (1980 - 2009)
Company Filing History:
26 out of 27,375 
1 out of 25 
1 out of 16,453 
Years Active: 1977-2009
Title: **Yoshiaki Igarashi: Innovator in Motor Technology**
Introduction
Yoshiaki Igarashi is a prominent inventor based in Ikoma, Japan, known for his significant contributions to motor technology with a total of 28 patents. His work focuses primarily on innovations in DC brushless motors, enhancing their efficiency and performance.
Latest Patents
Among Yoshiaki Igarashi’s latest patents is the **Three-phase DC brushless motor and winding method**. This invention enables a coil winding method that ensures consistent starting with PWM sensorless driving. It effectively suppresses the DC offset component of the induced voltage resulting from imbalances in the motor coil windings. The winding method achieves a state where the difference in mutual inductance is rendered substantially zero.
Another noteworthy patent is for a **motor driving device, motor driving method, and motor apparatus**. In this innovation, a motor driving component consists of half bridge circuits with high and low potential side transistors connected in series. This design includes a rotor position detector to monitor the rotor position and generate corresponding signals. A current phase detector is also implemented to ascertain the phase of the current flowing through the stator winding driving terminal. The voltage signal generator creates a voltage profile signal that maintains a predetermined electrical angle difference between the phase current and rotor position signal. Ultimately, a driving signal generator produces a PWM signal to control the drive transistors for each motor phase.
Career Highlights
Yoshiaki Igarashi has made a significant impact in the field of motor technology through his roles at Matsushita Electric Industrial Co., Ltd. His innovative approaches have led to advancements in motor design and functionality.
Collaborations
Throughout his career, Igarashi has collaborated with notable individuals including Hiroshi Mitani and Mitsuaki Oshima. These partnerships have fostered a creative environment for developing groundbreaking motor technologies.
Conclusion
Yoshiaki Igarashi’s contributions to the field of electric motors and related technologies position him as a leading inventor in this domain. His work not only showcases technical expertise but also highlights the importance of innovation in modern engineering solutions. As technology continues to evolve, Igarashi's patents will undoubtedly influence the future of motor design and functionality.