該結(jié)構(gòu)是在電機(jī)的軸上裝有一個磁環(huán)，它一般有6極磁環(huán)及2極磁環(huán)2種。當(dāng)電機(jī)轉(zhuǎn)子旋轉(zhuǎn)一圈時，磁環(huán)也旋轉(zhuǎn)一圈，磁環(huán)與PG板中的霍爾元件相感應(yīng)，6極磁環(huán)會在PG板的OUTPUT（白）腳中輸出3個脈沖，2極磁環(huán)會輸出1個脈沖，這樣根據(jù)輸出脈沖的數(shù)量就可以知道電機(jī)的轉(zhuǎn)速。在電控中設(shè)定有預(yù)定的轉(zhuǎn)速值，將它與從PG塊中采樣取得的轉(zhuǎn)速值相比較，當(dāng)轉(zhuǎn)速偏低時，則提高電控的輸出電壓（可控硅導(dǎo)通角變大），當(dāng)轉(zhuǎn)速偏高時，則降低電控的輸出電壓（可控硅導(dǎo)通角變?。?，這樣通過PG信號的反饋調(diào)節(jié)電控輸出電壓就實現(xiàn)了對電機(jī)的平滑調(diào)速。由于電控的輸出電壓不會高于其輸入電壓，因此在電機(jī)設(shè)計時要保證電機(jī)達(dá)到高風(fēng)檔的轉(zhuǎn)速時其電控的電壓不高于工作的額定電壓。如我國額定電壓為220VAC，則設(shè)計時的電控電壓一般設(shè)計為180VAC~200VAC左右。此參數(shù)值設(shè)定太低則造成電機(jī)材料浪費(fèi)，且電控若損壞擊穿后電機(jī)直通市網(wǎng)電壓，其電機(jī)溫升會較高；若此參數(shù)值設(shè)定過高則會造成市網(wǎng)電壓降低時，有可能達(dá)不到設(shè)定的額定轉(zhuǎn)速，影響空調(diào)的能力

　　抽頭調(diào)速

　　電容運(yùn)轉(zhuǎn)電動機(jī)在調(diào)速范圍不大時，普遍采用定子繞組抽頭調(diào)速。此時定子槽中放置有主繞組、副繞組及調(diào)速繞組，通過改變調(diào)速繞組與主、副繞組的聯(lián)接方式，調(diào)整氣隙磁場大小及橢圓度來實現(xiàn)調(diào)速的目的。

重要的是，對于模擬或數(shù)字控制結(jié)構(gòu)而言，輸入和輸出濾波器以及電源器件將基本上保持相同。

　　一般電容運(yùn)轉(zhuǎn)單相電機(jī)，主繞組與副繞組嵌在不同的槽中，繞組與鐵芯間由聚酯纖維無紡布（DMDM或DMD）隔開，其在空間一般相差90度電角度，且副繞組通過串聯(lián)一個工作電容器后與主繞組并接于電源。當(dāng)電機(jī)通電后，主繞組與副繞組在氣隙中共同形成一個有方向有幅值強(qiáng)度的旋轉(zhuǎn)磁場。其方向與主、副繞組所處的空間位置等有關(guān)，它決定了電機(jī)的轉(zhuǎn)向；其幅值強(qiáng)度則與主副繞組的參數(shù)設(shè)計有關(guān)，它決定了電機(jī)輸出力矩的大小。該旋轉(zhuǎn)磁場與轉(zhuǎn)子鼠籠轉(zhuǎn)子相互作用，使電動機(jī)按一定的方向旋轉(zhuǎn)。若調(diào)換主副繞組的空間位置，則旋轉(zhuǎn)磁場的旋轉(zhuǎn)方向會相反，該反方向的旋轉(zhuǎn)磁場與轉(zhuǎn)子相互作用，使電動機(jī)的轉(zhuǎn)向也會相反。

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福州卓凱電子科技有限公司

24小時銷售技術(shù)服務(wù)熱線 ：15506917382  0591-62182535
傳真（Fax）：0591-22989937

商務(wù)QQ ：583745937
聯(lián)系人： 王工（ 銷售工程師 ）

地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室
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