Dal Ho Cheong

Title: Innovations by Dal Ho Cheong

Introduction

Dal Ho Cheong is a notable inventor based in Seoul, South Korea. He has made significant contributions to the field of appliance technology, particularly in washing machines. With a total of 2 patents, his work focuses on enhancing the efficiency and effectiveness of washing machine motors.

Latest Patents

One of his latest patents is a "Method and device for controlling speed of a washing machine motor." This invention relates to a method and apparatus for controlling the speed of a washing machine motor by varying the number of revolutions and changing the direction of rotation of the motor to control the water current of the washing machine. The invention detects the actual speed of the washing machine motor at every half cycle of ordinary use power frequency. It determines speed error by comparing the detected actual speed with an ordered speed, determines a speed state from the speed error, calculates a proportional integration value according to the determined speed state, and scales the calculated proportional compensation value into an angular value. The washing machine's motor speed is controlled using the scaled angular value.

Another significant patent is the "Device for detecting motor speed of automatic washing machine." This device is suitable for detecting motor speed in accordance with different kinds of laundry and for improving the washing effect of the washing machine. The motor speed detecting device includes a motor speed detecting unit interposed between a support plate and a motor unit. The motor speed detecting unit is cased by a detecting unit casing and has a gear type detecting member mounted to the motor shaft, a rectangular base plate interiorly mounted to a side wall of the detecting unit casing, a magnet mounted to the base plate generating a magnetic line of force, and scanning the magnetic line of force on the detecting member. Additionally, a Hall effect linear sensor is mounted to the magnet and senses changes in the density of the magnetic force lines.

Career Highlights

Dal Ho Cheong is currently employed at Goldstar Co., Ltd., where he continues to innovate and develop new technologies for household appliances. His work has significantly impacted the efficiency of washing machines, making them more user-friendly and effective.

Collaborations

He collaborates with his coworker, Doo Whan Sang, to further enhance their inventions and bring new ideas to fruition.

Conclusion

Dal Ho Cheong's contributions to washing machine technology demonstrate his commitment to innovation and efficiency. His