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Servo Position Feedback: Resolvers vs. Hall Effect Sensors

Servo Position Feedback: Resolvers vs. Hall Effect Sensors

Servo Position Feedback: Resolvers vs. Hall Effect Sensors

(OP)
Can anyone comment on the differences and merits of each?
Do they provide information on position/speed of motor?  So position/speed control of the load would assume zero slippage?

RE: Servo Position Feedback: Resolvers vs. Hall Effect Sensors

Both are essentially position sensors. Halls are coarse sensors with 60 el.deg resolution. May be used for DC (six step, or trapez) Brushless non-demanding speed control applications.

Resolvers - rotating electrical mini macnines - provided Resolver-to-Digital Converter deliver position in digital format.

You say nothing about optical position encoders - absolute (expensive) and incremental.

Smart Position Initialization article overview at

www.drbrushless.com/cgi-bin/articles.phtml

gives an idea about AC (sine) brushless with incremental encoder without Hall sensors start-up issues.

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