Commonly used different types of encoder characteristics！

Advantages: the principle of simple structure, mechanical life expectancy can be tens of thousands of hours or more, high reliability, suitable for long-distance transmission.
Disadvantages: can only output relative position, can not output the absolute position of the shaft, power loss data loss.
Absolute value encoder
Advantages: no memory, no need to find the reference point, anti-jamming features, data reliability, higher resolution, fast start speed, multi-axis precise motion control, a variety of communication protocols.
Disadvantages: Installation and debugging difficult.
Optical encoder
Advantages: small size, precision, its resolution can be very high, no contact without wear; long life, easy to install, interface, rich in form and reasonable price. The same species can detect angular displacement, but also in the mechanical conversion device to help detect linear displacement; multi-turn optical absolute encoder can detect a considerable range of linear displacement.
Disadvantages: the use of outdoor and harsh environments put forward higher protection requirements; measurement of linear displacement to be dependent on mechanical device conversion, the need to eliminate the error caused by the mechanical gap; detection track running objects easily lead to slip.
Magnetic Encoders
Advantages: simple structure, resistance to harsh environments, wide frequency response, easy to achieve absolute position output, lower cost.
Disadvantages: precision requirements can not be too high.
Hollow shaft encoder
Compact, easy to adjust to adapt to a variety of applications. Hollow shaft type encoder shaft diameter size suitable for the motor shaft, and can be flexible to adjust the position of the spring. Installation does not require additional parts lead to an increase in the size of the installation. Easy to adjust the position and absorb the load vibration and shock.
Solid shaft encoders
The installation of the need to use flexible couplings, solid shaft encoder for the axis alignment of the operation of the relatively high precision requirements.

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