對新型電動自行車的關鍵動力部件———直流無刷電機作了深入的剖析與設計。本文所介紹的電動自行車中使用的直流無刷電機,系參考英國Patscentre 國際實驗室協作設計產品,采用全電子操縱系統,電動自行車的最高時速可達25km/ h ,一次充電行程為64km。該電機的功率為350W,重6kg ,具有自充電與過壓過流全保護功能,效率可達85 % ,性能綜合指標遠優于傳統的以有刷電機為動力的電動自行車。
關　鍵　詞:位置傳感器;無接觸換向;氣隙磁密
Abstract : This paper intends to make a better design on the D. C. motor , the key part of the new style electric bicycle , after the? detailed analysis. The D. C. motor without coal brushes is in a new style , with higher work rate , less wear and tear and lower noise. This kind of motor discussed in this paper , is designed in reference to the product designed by Patscentre International Lab , μK, which is operated with electronic system completely , in the top speed of 25km per hour , covering the distance of 64km each time it’s charged. The motor is 6kg in weight , with the power of 350W, which has the function of self2charge , and complete pro2
tection when the electric current and voltage is over the normal levels in the rate close to 85 %. The comprehensive index of the functions of this kind of motor is much better than that of all the traditional ones with coal brushes.
Key words : positional sensor ; exchange of A. C. and D. C. ; the air2space inside and the thickness of magnetic field intensity