Milestone-Proposal talk:Inverter-driven residential air conditioner 1981
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It is a really groundbreaking innovation in air-conditioner development history. The inverter air conditioner is nowadays widely used throughout the world and become the global standard of air conditioners. It has a big impact. -- Xdh (talk) 04:13, 12 June 2020 (UTC)
I am glad to be a reviewer for the proposal to milestone-proposal titled on Inverter driven residential air conditioner 1981. It is a really groundbreaking innovation in air-conditioner development history. The inverter air conditioner is nowadays widely used throughout the world and become the global standard of air conditioners. It is a great impact on both energy efficiency and environmental protection. Firstly the Plaque Citation is accurate to represent the novelty of the invention. Toshiba is firstly to embed the inverter into the air-conditioner by miniaturizing the inverter size. Secondarily the milestone well supported by the documents. One of the important pieces of evidence is paper titled on " Capacity Control with Frequency Modulation System", Japanese Association of Refrigeration in 1981. It reported the progress on inverter modulation controller the air-conditioners by Tokyo Shibaura Electric Co., Ltd. Toshiba commercialized the inverter-driven residential air-conditioner in 1980. It can be found in the Toshiba Science Museum. The contribution has been recognized in Japan with the Ichimura Prize in Industry in 1984 and Award of the Institute of Electrical Engineers of Japan in 2008. To solve the energy-inefficient problem of on-off control of the conventional air-conditioner. Toshiba leverage power transistor and microprocessor and sinusoidal pulse width modulation control and achieved a significant downsizing in its inverters. A downsizing inverter is critical to residential products. The energy efficiency of the inverter residential air conditioners reached a 40% improvement to the conventional fixed-speed ones. On technically, they solved the power circuit design and microprocessor PWM control issue. Besides, there are challenges of the mechanical issues due to the transition from the fixed speed to variable speed. Toshiba finally successfully overcome these obstacles with their technical expertise and obtain downsizing and lower costs inverter-driven residential air conditioners in 1981.
May 27, 2020 Dear Dr. Enrique Tejera, IEEE History Committee
RE: Review result of the IEEE Milestone proposal entitled "Inverter-driven residential air conditioner 1981"
Dear To whom it may concern lam willing to review the IEEE Milestone proposal entitled "Inverter-driven residential air conditioner 1981." First of all, let me introduce myself. I am, Professor, currently Distinguished Professor at the Tokyo Institute of Technology, Japan. I got my Ph. D. degree in power electronics from the Tokyo Institute of Technology in 1979. Since then, I have been conducting education and research on power electronics, motor drives, and their applications to indust印, transportation, and utilities. I have published some 140 IEEE Journal/Transactions papers, as well as three invited papers in Proceedings of the IEEE I was elected as an IEEE Fellow in 1996, and then an IEEE Life Fellow in 2020 I have received six IEEE Transactions Prize Paper Awards and 16 IEEE Industry Applications Society Committee Prize Paper Awards. I was a recipient of the IEEE William E. Newell Power Electronics Award in 2001, the IEEE Industry Applications Society Outstanding Achievement Award in 2004, the IEEE Richard H. Kaufmann Award 2008, the IEEE Power & Energy Society Nan Higorani Custom Power Award in 2012, and the IEEE Medal in Power Engineering in 2018 I served as the President of the IEEE Power Electronics Society from 2007 to 2008 for two years and the IEEE Division II Director from 2015 to 2016 for two yeas Since I have been involved in research on power electronics and motor drives in 1974, as a graduate student at the Tokyo Institute of Technology, I have known well the processes of the research and development, following the commercialization of inverter-driven residential air conditioners in Japan. Firstly, I will answer the following questions in line 1) Is the suggested wording of the Plaque Citation accurate? Yes, it is accurate. However, it would be much better if the term "conditioner" would eb replaced with "conditioners." 2) Is the evidence presented in the proposal of sufficient substance and accuracy to support the Citation? Yes, it is. No additional evidence is required 3) Does the proposed milestone represent a significant technical achievement? Yes, it does Toshiba put their residential split inverter-driven air conditioners on the market on December 2, 1981. Two years later, Hitachi followed Toshiba in terms of commercialization of residential split inverter-driven air conditioners in 1983. However, Hitachi replaced induction motors with permanent-magnet synchronous motors with ferrite magnets. As a result, the Japanese market of residential split inverter-driven air conditioners have been expanding leaps and bound, accompanied by price reduction and technical improvement. This is a good example that an appropriate competition among manufacturers are mandatory to market expansion In conclusion, I strongly recommend the proposal entitled "Inverter-driven residential air conditioner 1981" to be awarded the prestigious IEEE Milestone in 2020 Please let me know if you have any question on this matter M 子一刃kグ請、末泰文 Hirofumi Akagi, IEEE Life Fellow Distinguished Professor Tokyo Institute of Technology Phone/Fax: 81-45-924-5623 E-mail: email@example.com