Incremental Rotary Encoders
Incremental encoders convert angular motion or position of a shaft into an analog or digital code. The square wave or sinusoid output signal of an incremental encoder provides information about the motion of the shaft, which is typically processed elsewhere into information like position, speed, and distance.
Incremental encoders are among the most commonly used rotary encoders.
There are several advantages of incremental encoders, such as:
- Excellent speed and distance feedback
- Simple systems
Absolute Rotary Encoders
An absolute rotary encoder provides speed and position information by outputting a digital word or bit in relation to motion. The output of an absolute encoder indicates the current shaft position, making it an angle transducer.
Absolute rotary encoders offer a few advantages over incremental, such as:
- Higher resolution
- Better start up performance due to low homing time
- Accurate motion detection along multiple axes
- Multiple output protocols for better electronics integration
- Better recovery from system or power failures