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For the Inventor, By the Inventor

Ashikaga, Japan

Kenichi Iizuka

This inventor holds 9 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.. Active years: 1977-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kenichi Iizuka. Retrieved from https://idiyas.com/inventor/kenichi-iizuka

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 4.5

ph-index = 8

Forward Citations = 247(Granted Patents)


Location History:

  • Shimotsuga, JA (1977)
  • Ashikaga, JP (1986 - 1991)

Company Filing History:

goldMedal9 out of 42,726 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 162 
 
Hitachi Engineering Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1977-1991

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9 patents (USPTO):Explore Patents
1. 4992715 - Torque control apparatus for rotating motor machine (1991-02-12),
2. 4879502 - Speed control apparatus and method for motors (1989-11-07),
3. 4855652 - Speed control apparatus for a brushless direct current motor (1989-08-08),
4. 4748535 - Method of magnetizing rotor of motor (1988-05-31),
5. 4718247 - Refrigerator temperature control system (1988-01-12),
6. 4709317 - Inverting apparatus (1987-11-24),
7. 4662185 - System of controlling refrigerator temperature (1987-05-05),
8. 4566289 - Refrigerator control system (1986-01-28),
9. 4051417 - Control system for a brushless motor (1977-09-27),

Title: Kenichi Iizuka: Innovator in Motor Control Technologies

Introduction

Kenichi Iizuka is a prominent inventor based in Ashikaga, Japan. He has made significant contributions to the field of motor control technologies, holding a total of 9 patents. His work focuses on enhancing the efficiency and performance of motor machines.

Latest Patents

Iizuka's latest patents include a "Torque control apparatus for rotating motor machine." This invention features a torque control unit that rotates a motor machine with a motor element and a load element. The load element is connected to the motor element via a rotational main shaft and is driven to rotate by the motor element. The system detects rotational acceleration at each angle during one revolution of the main shaft and provides feedback. The electromagnetic torque of the motor element is controlled to ensure that the difference between the electromagnetic torque and the load torque becomes zero at each rotation angle. Another notable patent is the "Speed control apparatus and method for motors." This invention allows for precise control of voltage or current supplied to the motor, ensuring that the motor's speed aligns with a command speed. It minimizes pulsation and noise, particularly at low revolutions, by storing and correcting data indicative of voltages or currents supplied to the motor.

Career Highlights

Throughout his career, Kenichi Iizuka has worked with notable companies such as Hitachi, Ltd. and Hitachi Engineering Co., Ltd. His experience in these organizations has contributed to his expertise in motor technologies and control systems.

Collaborations

Iizuka has collaborated with several professionals in his field, including Hideo Uzuhashi and Minoru Kobayashi. These collaborations have likely enriched his work and led to innovative solutions in motor control.

Conclusion

Kenichi Iizuka's contributions to motor control technologies through his patents and collaborations highlight his role as an influential inventor. His work continues to impact the efficiency and performance of motor machines in various applications.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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