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Singleturn vs. Multiturn

2022年3月29日

旋轉編碼器會使用單圈和多圈術語。兩者的差異是使用單圈編碼器時,編碼器軸的每圈都會產生重複的輸出碼。從資料無法判斷編碼器的圈數為 1 或 1000。使用多圈絕對式編碼器時,在高達某個特定圈數(例如 4096 圈)的每圈裡,每個軸位置都會產生不重複的輸出。

An example of a multiturn encoder application is linear position feedback by measuring the number of revolutions of a precision ball screw. A specific linear motion can be achieved with a specific number of revolutions. If the exact position of the system is required at power-up, the additional capability of counting the number of revolutions without mains power is required. This is useful when moving the system manually while the main power to the machine is off.

An example of a system that requires only a singleturn encoder is one whose movement is limited by hardware to less than one full turn. For example, the position of the front wheels (steering wheels) in a car can only be rotated ±30 degrees left and right. The encoder that measures the steering angle does not need to count more than 0 - 60 degrees of movement, so multiturn counters are irrelevant for such an application.

Another way to illustrate the difference between the two types is to think of the singleturn encoder as a clock with only a minute hand, and the multiturn encoder as a clock with a minute hand and an hour hand. Both have 60 positions within one revolution, but the multiturn encoder (clock with hour hand) can also count up to 12 full revolutions.

部分多圈編碼器的額外功能是即使在編碼器未開啟電源的情況下也能計算完整圈數的功能。為了達成這個額外功能,多圈編碼器需要額外的硬體,以便計算圈數。可以透過以下方式完成:

  • 電池供電:電池可跨不同的電源循環週期保持計數。使用省電的電子裝置設計來偵測動作。
  • 齒輪傳動:齒輪系可機械儲存圈數。
  • 自行供電:這些編碼器運用能量採集原理,透過移動軸來產生能量。此原理在 2007 年導入,使用韋根感測器產生電力為編碼器供電,並將圈數寫入非揮發性記憶體。

Left: single-turn; right: multi-turn



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