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。直流無刷電機是一種具有高效率、低磨損、低噪聲的新型直流電機機種。文中所介紹的電動自行車中使用的直流無刷電機, 系參考英國Pats2cent re 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 , 1 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: Th is paper intends to make a bet ter design on the DC mo to r, the key part of the new style elect ric bicy2 cle, after the detailed analysis. The DC mo to r w ithout coal brushes is in a new style,w ith h igher wo rk rate, less w ear and tear and low er no ise. Th is k ind ofmo to r discussed in th is paper, is designed in reference to the p roduct de2 signed by Patscent re Internat ional L ab,U K,w h ich is operated w ith elect ronic system comp letely, in the top speed of 25km per hour, covering the distance of 64km each t ime it’s charged. Themo to r is 6kg in w eigh t,w ith the pow er of 350W ,w h ich has the funct ion of self- charge, and comp lete p ro tect ion w hen the elect ric current and vo ltage is over the no rmal levels in the rate clo se to 85%. The comp rehensive index of the funct ions of th is k ind of mo to r is
much bet ter than that of all the t radit ional ones w ith coal brushes.
Key words: po sit ional senso r; exchange ofA C and D C; the air- space inside and the th ickness ofmagnet ic field in2 tensity