Location History:
- Hitachi, JP (1999)
- Hitachiota, JP (2008)
Company Filing History:
2 out of 42,496 
1 out of 162 
1 out of 8 Years Active: 1999-2008
Title: Yoshiaki Ajima: Innovator in Motor Control and Communication Systems
Introduction
Yoshiaki Ajima is a notable inventor based in Hitachi, Japan. He has made significant contributions to the fields of motor control and communication systems, holding a total of 2 patents. His innovative work has had a lasting impact on technology and engineering.
Latest Patents
One of Ajima's latest patents is titled "System and method for driving synchronous motor." This invention involves a driving apparatus for a synchronous motor that ensures all switching devices of an inverter are turned off based on a control pulse signal from a pulse generator. The design allows motor current to continue flowing through free wheel diodes for a specific duration, even after the switching devices are in the off state. This mechanism enables the pulse generator to change an induced voltage detection signal to a high level after the motor current has dropped to zero, facilitating the estimation of rotor position.
Another significant patent is "Communication control device and a communication system using the same." This device allows multiple data items to be transferred to and from external devices, such as a CPU and memory, through an external bus with varying data bus widths in DMA transfer mode. The DMA controller within the communication control device manages the DMA transfer, producing signals that indicate the continuity of data items.
Career Highlights
Throughout his career, Yoshiaki Ajima has worked with prominent companies, including Hitachi, Ltd. and Hitachi Engineering Co., Ltd. His experience in these organizations has contributed to his expertise in developing advanced technologies.
Collaborations
Ajima has collaborated with notable colleagues, including Kiyoshi Sakamoto and Tsunehiro Endo. Their teamwork has fostered innovation and progress in their respective fields.
Conclusion
Yoshiaki Ajima's contributions to motor control and communication systems exemplify his innovative spirit and technical expertise. His patents reflect a commitment to advancing technology and improving efficiency in engineering applications.