The Air Cleaner with Nidec’s Jointly Developed Counter rotating Propeller Fan Wins the FY 2021 Energy Conservation Award

by Robyn Bonavita

Allergies have seemed to get worse in recent years and the people getting them is only increasing so Nidec Corporation came up with a solution to help alleviate the problem. 

Nidec Corporation announced today that PU-AA50, the air cleaner with the counter-rotating propeller fan that the Company jointly developed with Zojirushi Corporation has won the Energy Conservation Center, Japan’s FY2021 Energy Conservation Award in the area of products and businesses.

Purifying the Air

Statistics released by Japan’s Ministry of Health, Labour and Welfare demonstrate a growing number of people with allergies in recent years, and the needs for air cleaners to counter allergies are expected to increase. PU-AA50, an excellent, low-noise air cleaner intended for a large space (24 tatami mats, or app. 38.88m2), omni-directionally takes in and purifies the air 30cm above the floor, where pollens and house dust tend to accumulate and where small children spend much of their time. PU-AA50 cleans the air inside a room by generating a large volume of air that reaches its ceiling. In addition, this product boasts the best-in-class noise level*, which is lower than that of the inside of a library, and the power of 10W, which is approximately 20% of those of its rival products. These facts led PU-AA50 to win the FY2021 Energy Conservation Award.
With the counter-rotating propeller fan, two fans, each designed optimally, rotate in the reverse direction from each other for the swirling component of the wind generated by one of the fans to be collected by the other, which rotates in the opposite direction, to generate a very straight, far-reaching airflow. Based on its past experience of using this counter-rotating propeller fan to cool servers, Nidec has utilized the technology from this area to design the fan’s main unit and airflow path jointly with Zojirushi, and contributed to improving the performance of our high-efficiency motors and the entire air cleaner.


 Nidec stays committed to giving the world products and solutions that other companies cannot imitate and meeting the needs of our customers and society.


*This information is as of February 20, 2022 for mechanical air cleaners for the applicable floor space of 20 tatami mats (app. 33m2) and larger, on the standard mode of operation (with the maximum air volume).

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Nidec was established in Kyoto, Japan in 1973 by its Chairman Shigenobu Nagamori. In 1979, Nidec became the first company in the world to successfully commercialize a direct drive spindle motor for HDDs based on a brushless DC motor. Since then, the company has grown into a world-leading comprehensive motor manufacturer encompassing more than 300 subsidiaries employing over 100,000 people throughout the world and with annual sales exceeding $13B. Nidec’s motors, drives, generators and related products are found in a diverse range of applications including computers, smartphones, home appliances, automobiles, manufacturing plants, robots and more.

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