6AV6545-0AA10-0XA0現貨;
6AV6545-0AA10-0XA0供應。
變頻器是運動控制系統(tǒng)中的功率變換器。當今的運動控制系統(tǒng)包含多種學科的技術領域,總的發(fā)展趨勢是:驅動的交流化,功率變換器的高頻化,控制的數字化、智能化和網絡化。因此,變頻器作為系統(tǒng)的重要功率變換部件,提供可控的高性能變壓變頻的交流電源而得到迅猛發(fā)展。
隨著新型電力電子器件和高性能微處理器的應用以及控制技術的發(fā)展,變頻器的性能價格比越來越高,體積越來越小,而廠家仍然在不斷地進步可靠性實現變頻器的進一步小型輕量化、高性能化和多功能化以及無公害化而做著新的努力。變頻器性能的優(yōu)劣,一要看其輸出交流電壓的諧波對電機的影響;二要看對電網的諧波污染和輸進功率因數;三要看本身的能量損耗如何。這里僅以量大面廣的交—直—交變頻器為例,闡述它的發(fā)展趨勢:
主電路功率開關元件的自關斷化、模塊化、集成化、智能化;開關頻率不斷進步,開關損耗進一步降低。
變頻器主電路的拓撲結構方面。變頻器的網側變流器對低壓小容量的裝置常采用6脈沖變流器,而對中壓大容量的裝置采用多重化12脈沖以上的變流器。負載側變流器對低壓小容量裝置常采用兩電平的橋式逆變器,而對中壓大容量的裝置采用多電平逆變器。對于四象限運行的轉動,為實現變頻器再生能量向電網回饋和節(jié)省能量,網側變流器應為可逆變流器,同時出現了功率可雙向活動的雙PWM變頻器,對網側變流器加以適當控制可使輸進電流接近正弦波,減少對電網的公害。
脈寬調制變壓變頻器的控制方法可以采用正弦波脈寬調制控制、消除次數諧波的PWM控制、電流跟蹤控制、電壓空間矢量控制(磁鏈跟蹤控制)。
20) 你笑一次我可以高興好幾次,可看你哭一次,我就難過了好幾年。
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