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Is a Modular Encoder Right for Your Application?

From Encoder Products Company

Modular, or "Kit", encoders are a specialized category of rotary encoders. The difference between a modular encoder and a standard
encoder is that the modular encoder does not incorporate internal bearings into its design. Instead, it relies on the host, typically a motor,
to supply the structural integrity necessary for proper operation. At first glance, this approach seems to be a good idea, since eliminating
the bearings can lower the price of the encoder and give the overall encoder a lower height profile. Motor manufacturers often favor
modular encoders for these reasons.
However, modular encoders are definitely not a panacea, and can be good or bad, depending upon personal experience. The root
problem is not modular encoders themselves, but the fact that they are often misapplied, and a proper understanding of the trade-offs
involved will go a long ways towards preventing a bad experience. The primary purpose of this bulletin is to help you determine whether
a modular encoder is the right choice for your application. In addition, you will better understand the trade-offs involved, and proper
implementation, so that you will see only benefits.

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Products & Services
Incremental Rotary Encoders
Incremental rotary encoders are multi-turn sensors that use optical, mechanical, or magnetic index-counting for angular measurement. They contain no absolute reference, but instead count relative to the turn-on position.
Linear Encoders
Linear encoders sense and digitize linear position change for positional measurement and feedback to control systems.
Absolute Rotary Encoders
Absolute rotary encoders use optical, mechanical, or magnetic indexing for angular measurement. They do not lose their position after power-down, but instead provide absolute position upon power-up without requiring a home cycle or any shaft rotation.
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Gurley Precision Instruments - Virtual Absolute Technology
Gurley Precision Instruments has developed a unique encoding method that combines the simplicity of an incremental encoder with the reliability of an absolute encoder. (read more)
Avago Technologies - Ultra-Precision 17-Bit Absolute Encoder
The Avago Technologies AEAT-9000 series are high resolution single turn optical absolute encoders. They are designed to allow design engineers to achieve superior positioning performance in terms of... (read more)
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