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Singleturn vs. Multiturn

2022年3月29日

对于旋转编码器,使用了单圈和多圈术语。两者之间的区别是,对于单圈编码器,输出代码随着编码器轴每转一圈而重复。没有能够指明编码器是转了一圈还是转了1000圈的数据。对于多圈绝对式编码器,在一定的圈数范围内(例如4096),每一圈的每个轴位置的输出代码是唯一的。

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.

一些多圈编码器的附加功能是,即使编码器未通电,也能计算整圈转数。为了实现这一附加功能,多圈编码器需要额外的硬件才可以计算转数。这可以通过下述方式实现:

  • 电池供电型:电池可以在多个加电循环中保持计数。它使用节能电气设计来检测运动。
  • 齿轮型:齿轮传动系统以机械方式存储转数。
  • 自供电型:这些编码器使用能量收集原理从运动轴生成电能。这一原理于2007年提出,使用Wiegand传感器产生足以为编码器供电的电能,并将转数写入非易失性内存。

Left: single-turn; right: multi-turn



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