This inventor holds 2 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Keiyo Eng. Co., Ltd., Hitachi Keiyo Engineering Co., Ltd.. Active years: 1985.
Company Filing History:
2 out of 42,717 
1 out of 1 
1 out of 34 Years Active: 1985
Title: Sadayuki Igarashi: Innovator in Motor Control Technology
Introduction
Sadayuki Igarashi is a notable inventor based in Funabashi, Japan. He has made significant contributions to the field of motor control technology, particularly in the development of control apparatuses for induction and AC motors. With a total of 2 patents, Igarashi's work has had a meaningful impact on the efficiency and performance of electric motors.
Latest Patents
Igarashi's latest patents include a "Control apparatus for induction motor" and a "Control apparatus for AC motors." The control apparatus for an induction motor features an inverter connected between a power source and the motor, allowing for optimized energization. This innovation adjusts the magnetizing current component command and torque current component command based on the input voltage of the inverter. The control apparatus for AC motors addresses the challenges of driving an AC motor with a PWM inverter. It modulates the width of a speed command signal to produce width-modulated pulses, effectively reducing noise and magnetic vibrations during low-speed operation.
Career Highlights
Throughout his career, Igarashi has worked with prominent companies such as Hitachi, Ltd. and Hitachi Keiyo Engineering Co., Ltd. His experience in these organizations has allowed him to refine his expertise in motor control technologies and contribute to various innovative projects.
Collaborations
Igarashi has collaborated with notable colleagues, including Hisakazu Ninomiya and Hiroshi Nagase. These partnerships have fostered a collaborative environment that has led to advancements in motor control systems.
Conclusion
Sadayuki Igarashi's contributions to motor control technology through his patents and collaborations highlight his role as an influential inventor in the field. His work continues to inspire advancements in electric motor efficiency and performance.