意大利意爾創ELTRA增量編碼器EL58B2500Z8/24L106MR
傳統的光電編碼器碼盤的材料有玻璃、金屬、塑料,玻璃碼盤是在玻璃上沉積很薄的刻線,其熱穩定性及精度可以達到普通標準、 般要求,但容易碎。金屬碼盤直接以通和不通刻線,不易碎,但由于金屬有 定的寬度要求 ,精度就有限制,其熱穩定性就要比玻璃碼盤差 個數量 。塑料碼盤是經濟型的,其成本低,精度和耐高溫達不到高要求。
而磁性編碼器采用磁電式設計,通過磁感應器件、利用磁場的變化來產生和提供轉子的 對位置,利用磁器件代替了傳統的碼盤,彌補了光電編碼器的這 些缺陷,更具抗震、耐腐蝕、耐污染、性能更可靠 、結構更簡單。光電增量編碼器是通過在碼盤上刻線來計算精度,所以精度越高,碼盤就會越大,編碼器體積越大,并且精度也不是連續的。磁性編碼器則沒有這樣的限制,可以做到體積很小。
磁性編碼器經常也被稱為磁電式編碼器,是 種新型的角度或者位移測量裝置,其原理是采用磁阻或者霍爾元件對變化的磁性材料的角度或者位移值進行測量。磁性材料角度或者位移的變化會引起 定電阻或者電壓的變化,通過放大電路對變化量進行放大,通過單片機處理后輸出脈沖信號或者模擬量信號,達到測量的目的。磁性編碼器的結構分為采樣檢測和放大輸出兩部分,采用檢測 般采用橋式電路來完成,有半橋和全橋兩種,放大輸出 般通過三 管和運放等器件去實現。
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