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Simple Digital Feedbacks
What types of digital sensors are known to you?
Digital Halls, incremental encoder, a combination of digital halls and an incremental encoder, and absolute serial sensors.
For Elmo drives, how do you know which types of feedback they support when looking at the product catalog number?
Reference it according to the product matrix. “R” is for Resolver, and so on. It is usually the last product code of the catalog number.
What are digital hall sensors used for?
They assist in commutation of the motor for electrical cycle reference. The hall sensors give the location of the rotor to a tolerance of ±30 electrical degrees.
How many hall code states are there in one electrical cycle?
Six states
What are the hall codes’ illegal states?
There are two illegal states in Elmo drives. Those states are '111' and '000'
Why do we need 120 Ohm input resistance in the A/B internal differential OP AMP input?
Mainly for noise immunity.
Does the drive perform auto phasing when the Feedback is digital halls + incremental encoder?
No, only phase correction. Namely offset correction of the absolute hall’s zero with respect to the motor’s electrical zero.
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