I am trying to understand how the KBIC controller works. http://www.galco.com/scripts/cgiip.exe/wa/wcat/webpromo2.htm?promo=120KBIC
My understanding so far is: Universal motors are brush motors with windings for the armature and the stator. They can run on DC, or more commonly, AC if both windings are kept in phase. To reverse direction, the polarity of the armature or the stator is reversed. The speed of the motor can be controlled by changing the average voltage to either the rotor or stator by PWM, PDM or SCR (I don't know the term, but like a light dimmer). Because there is mains voltage on the control potentiometer, the KBIC appears to use an SCR to control the passing of mains current to the motor. There seems to be no provision for motor direction control, but an external means of reversing the polarity of a winding might do it. The documentation mentions that the controller has current limiting to prevent demagnetizing permanent magnet motors, but provides no information on how to use the controller with PM motors. Usually, Universal motors are used where cost is a major factor, but when you try to control one, the controller, and if needed for CNC, the analog input and reversing options are fairly expensive. For CNC, it seems that you would save money by changing out the motor for a PM motor and PWM controller. Although, if you run the Universal on DC, it should act like and be controllable by a PM motor controller? Am I off base on any of this? ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
