How to choose an encoder！

Choosing An Encoder

From a user’s perspective, the technology behind an encoder (magnetic or optical) is only relevant if it determines the performance that can be achieved. Particularly when employed as part of an MMI, the encoder undergoes mechanical stress and has to function also while on fast rotation.

Therefore, having determined whether incremental or absolute encoding is required, the key selection criteria are rotational speed, measured in rpm, and angular resolution, either quoted as the number of positions per revolution or the equivalent number of bits.

Of course, if the intended application is going to subject the encoder to extended use at high speeds, some consideration of life expectancy is appropriate, i.e., choosing an encoder with suitable high-performance ball bearings. Beyond this, normal considerations of quality, reliability, and price will apply.

Rather than considering these factors from an abstract position, it is easier to look at a number of representative products from various manufacturers to understand their advantages in the types of applications they target.

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