Noritoshi Tuzi

Title: Noritoshi Tuzi and Inverter Frequency Protection

Introduction

Noritoshi Tuzi is an inventor associated with Narashino, Japan, and Hitachi, Ltd. His work includes an inverter apparatus designed to prevent an excessive increase in output frequency and help protect the connected AC rotary electric machine from overspeed operation. Tuzi is credited with 1 patent.

Latest Patents

Tuzi’s listed patent, “Inverter apparatus for preventing an overincrease of output frequency,” concerns a microcomputer-controlled inverter suitable for driving an AC rotary electric machine. The apparatus detects output current, output voltage, or a control signal to determine the inverter’s output frequency. It also uses a hardware switch structure with a memory function to set and retain an upper frequency limit.

By comparing the detected output frequency with that limit, the apparatus can reliably suppress the frequency when it reaches the threshold. The hardware-based limit is designed to resist noise-related changes, helping prevent unintended overspeed operation of the driven machine.

Career Highlights

Tuzi’s listed invention addresses a practical control and safety challenge in inverter-driven electric machines. Its approach combines frequency detection with a hardware-set upper limit to support dependable operation.

Collaborations

The available information associates Tuzi with Hitachi, Ltd. and lists Hiroshi Fujii and Satoshi Ibori as coworkers. It does not specify their roles in the patent or describe particular collaborative contributions.

Conclusion

Noritoshi Tuzi’s listed patent presents a method for limiting inverter output frequency and reducing the risk of overspeed in an AC rotary electric machine.