對(duì)新型電動(dòng)自行車的關(guān)鍵動(dòng)力部件——直流無(wú)刷電機(jī)作了深入的剖析與設(shè)計(jì)。直流無(wú)刷電機(jī)是一種具有高效率、低磨損、低噪聲的新型直流電機(jī)機(jī)種。文中所介紹的電動(dòng)自行車中使用的直流無(wú)刷電機(jī), 系參考英國(guó)Pats2cent re 國(guó)際實(shí)驗(yàn)室協(xié)作設(shè)計(jì)產(chǎn)品, 采用全電子操縱系統(tǒng), 電動(dòng)自行車的最高時(shí)速可達(dá)25km?h , 1 次充電行程為64km。該電機(jī)的功率為350W , 重6kg, 具有自充電與過壓過流保護(hù)功能, 效率可達(dá)85% , 性能綜合指標(biāo)遠(yuǎn)優(yōu)于傳統(tǒng)
的以有刷電機(jī)為動(dòng)力的電動(dòng)自行車。
關(guān)鍵詞: 位置傳感器; 無(wú)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