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According to the recent trend of high speed and heavy load in truck & bus services, supplemental brake systems are highly desired to obtain safety, easy operation, and economical advantages such as longer lining life. To meet such requirements, a compact eddy current brake system (ECB retarder) using powerful permanent Nd-Fe-B magnets has been designed, manufactured, and supplied to market. This paper reports the basic idea, construction design, and material selection of new ECB retarders. Using the derivation from Maxwell equations, the retardation force was obtained, and the design was made based on the obtained principle.

Recently engin output and vehicle speed are much improved and there received much requests for better brake system with high performance and safety. In order to meet these reguests research work was initiated to develop new retavder system as auxiliary brake, and new compact & light weight retarder without requiring electricity consumption was successfully developed by using very strong parmanent magnet of Nd-Fe-B base for the first time in the world. This new retarder was marketed in the last January for the heavy duty truck followed medium duty tyuck in this April. This new retarder well matched with market needs has been highly commented upon beyond engineer expectation, and it is believed that this new system will be popularized very rapidly in Japan.