Dave Keeton wrote: >>The motor has only Hall sensors. Do the Hall sensors have an analog >>output in order to be able to position the rotor at a desired angle from >>the sensors? > > > I think that Hall Effect sensors are sinusoidal output. At least > with my experience with them. The ones that I have worked with have an a, > not a, b, not b and z, not z. They are converted to TTL square wave in the > drive itself. I think you will find they are digital coming out of the motor. They work more like an Inductosyn linear scale. Signal > amplitude is critical, to much and the drive will start clipping and giving > you false feed back or throwing alarms. I think plain old encoders are a > better bet for a bridgeport. Hall effect sensors are to sensitive and to > expensive to replace if you need to. Real Hall sensors are buried in the motor, and would require extreme surgical measures to even get to them. Many brushless motors with "industry standard" hall outputs use a Renco encoder which gives ABZ plus the "Hall" signals.
Yes, optical encoders are great, but you still need commutation signals from the motor to properly drive a brushless drive. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
