sasikumar Posted August 16, 2004 Report Share Posted August 16, 2004 hi..currently im doing my final yr project on "single phase controlled rectifier(scr) for DC motor"...im having problem in designing the scr triggering circuit..my objective is to provide variable dc voltage so that i'd control the speed of motor.. im stuck already...my presentation would be on coming Sept.. at least i must manage to submit the simulation result of the said circuit to my lecture.. im helpless now.. would appreciate ur help if you could give me any sample circuits..plz help me!!!rgds,sasikumar Quote Link to comment Share on other sites More sharing options...
ante Posted August 16, 2004 Report Share Posted August 16, 2004 Sasikumar,If you post the circuit you Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted August 16, 2004 Report Share Posted August 16, 2004 If you are using DC then what is the phase for? Are you using pulse width modulation? You have to have two signals for phase. Does the motor have multiple windings? An SCR will require anode current interuption to turn it off. This can be easily accomplished if you are working with low voltage such as 12v. But it may be more difficult if the voltage is higher. Quote Link to comment Share on other sites More sharing options...
surajbarkale Posted August 17, 2004 Report Share Posted August 17, 2004 Hope this helps this document dose not gives direct DC voltage => Motor Speed circuit but has potentiometer controlled circuits. http://www.littelfuse.com/data/Application_Notes/an1003.pdf Quote Link to comment Share on other sites More sharing options...
sasikumar Posted August 17, 2004 Author Report Share Posted August 17, 2004 thanks for ur kind attention... actually i was assigned to design a single phase full wave controlled rectifier using center-tapped transformer... input will be 240rms ... load for this rectifier will be a DC motor.. my aim is to provide a variable DC output voltage ranging from 0-60Vdc so that i'd control the dc motor...but im not really sure that whether the speed of the motor can be controlled by just varying the firing angle of the thyristors(im using SCR's)... or not!! now,problem is dont to design the control circuits(zero crossing detector,pulse generator,pulse transformer(isolation)).... Quote Link to comment Share on other sites More sharing options...
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