Servo Position Feedback: Resolvers vs. Hall Effect Sensors 1

[jharjula]

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?

 

[jbartos]

Suggestion: Visit

http://www.motionvillage.com/training/handbook/feedback/

http://motioncontrol.com/products/level2.cfm?catpath1=Sensors

http://www.emoteq.com/products.htm

etc. for more info

 

[avigodner]

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

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

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