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detecting motor speed via armature feedback

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david90

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practically speaking, how does a DC drive detects a motor's speed using armature voltage feedback?

since
Vsource = IR+CEMF
CEMF= Vsource - IR

How does a DC drive know what the CEMF is if it doesn't know what the amature resistance is? I work with a lot of DC drives and I never have to input the amature resistance during the DC drive programming process.
 

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