描述
只有大型發(fā)電機(jī)或電動(dòng)機(jī)使用分?jǐn)?shù)槽,小型發(fā)電機(jī)或電動(dòng)機(jī)都是整數(shù)槽。
分?jǐn)?shù)槽優(yōu)點(diǎn):
①能削弱磁極磁場(chǎng)非正弦分布所產(chǎn)生的高次諧波電勢(shì);
②能有效地削弱齒諧波電勢(shì)的幅值,改善電動(dòng)勢(shì)的波形;
③減小了因氣隙磁導(dǎo)變化引起的每極磁通的脈振幅值,減少了磁極表面的脈振損耗。
分?jǐn)?shù)槽缺點(diǎn):繞組的磁動(dòng)勢(shì)存在奇數(shù)次和偶數(shù)次諧波,在某些情況下它們和主極磁場(chǎng)相互作用可能產(chǎn)生一些干擾力,當(dāng)某些干擾力的頻率和定子機(jī)座固有振動(dòng)頻率重合時(shí),將引起共振,導(dǎo)致定子鐵芯振動(dòng)。因此,分?jǐn)?shù)槽q值選擇不當(dāng)也可能帶來(lái)很多隱患,這在實(shí)際發(fā)電機(jī)或電動(dòng)機(jī)的運(yùn)行中是有例子的。
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門(mén)子系列產(chǎn)品)》
⑥銷(xiāo)售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門(mén)子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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