Location History:
- Ibaraki, JP (1978)
- Ibarakimachi, JA (1978)
- Higashiibaraki, JP (1979)
Company Filing History:
Years Active: 1978-1979
Title: Tadao Kameyama: Innovator in Elevator Control Systems
Introduction
Tadao Kameyama is a notable inventor based in Ibaraki, Japan. He has made significant contributions to the field of elevator control systems, holding a total of 3 patents. His work has been instrumental in enhancing the efficiency and safety of elevator operations.
Latest Patents
Kameyama's latest patents include an innovative elevator control apparatus. This apparatus features a three-phase AC tachometer generator coupled to a motor for driving an elevator car. The AC output of the tachometer generator is full-wave rectified for use as a speed feedback voltage. A waveform-shaping circuit generates one pulse for each cycle of the output of the AC tachometer generator. A counter counts such pulses after the car has passed a deceleration-initiating point, producing counts proportional to the car's running distance after this point. From these counts, a deceleration command voltage is obtained, which decreases progressively according to the car's position. During deceleration, the car-drive motor is subjected to feedback control based on the difference between the speed feedback voltage and the deceleration command voltage, effectively controlling the elevator car's deceleration.
Another significant patent is related to a three-phase load controlling system. In this system, two bilateral switching circuits control the current in the first and third phases, with the first phase being later than the third. The second phase remains uncontrolled. The gating signals applied to the bilateral switching arrangement in the first phase are advanced by a constant degree concerning the voltage of the first phase, while those in the third phase are synchronized with the voltage of the third phase.
Career Highlights
Tadao Kameyama is currently employed at Hitachi, Ltd., where he continues to innovate and develop advanced technologies in elevator systems. His expertise in control systems has positioned him as a key figure in the industry.
Collaborations
Throughout his career, Kameyama has collaborated with notable colleagues, including Yasuyuki Maeda and Nobuo Mitsui. These collaborations have further enriched his work and contributed to the development of cutting-edge technologies.
Conclusion
Tadao Kameyama's contributions to elevator control systems exemplify his innovative spirit and technical expertise. His patents reflect a commitment to improving safety and efficiency in elevator operations. His work continues to
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