Summary and recommendations
Incremental encoders (optical)
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- Good resolution - up to 20,000 ppr on standard Parker product
- Good for applications where going back to home for out of application situation (power down) is not a concern
- Low cost |
Absolute encoders
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- Provide absolute position upon powering up (no homing required)
- Provide a very high resolution - 16 bit = 65,536 ppr - 20 bit = 1,048,576 ppr - Options for memory download to support "smart” encoder option - Option to allow for single cable from the motor for power and feedback |
Resolver
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- Good resolution (12 bit) - Very rugged – 40g vibration and 200g shock - High temp suitability – up to 200 deg. C - Provide absolute position within a single turn - Accuracy not as good as incremental or absolute encoders - Low cost |
With the wide variety of application demands and environmental conditions, spanning both rotary and linear servo motor designs, selecting a compatible motor and feedback device can be a daunting task. We hope that this blog post helps in making the right choices for your most challenging applications.
Article contributed by Jeff Nazzaro, gearhead and motor product manager, Electromechanical & Drives Division, Parker Hannifin Corporation.
Disclaimer
Licensing for these images came with permission from the Parker Hannifin Media Manager collection.
Article reposted with Parker Hannifin's permission.