Isn't this how most closed loop stepper drives claim to work? Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031
-----Original Message----- From: Chris Albertson <albertson.ch...@gmail.com> Sent: Tuesday, January 11, 2022 2:06 PM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: [Emc-users] Field Oriented Control (FOC) algorithm for BLDC and Stepper motors. [EXTERNAL EMAIL] Be sure links are safe. Here is a different way to control a stepper motor. This control method treats the stepper as if it is just a plain old BLDC motor but with 50 poles and 2 phases. Positional accuracy is determined by an encoder, not the number of steps as the controller is not doing "steps" but using the motor as a continuous motion servo. It seems like this could be a retrofit to a machine that uses steppers to give an increased performance while keeping the same motors. You can read the theory used here: https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FVector_control_&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Cc21d1504e33b42a15eaf08d9d535a470%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637775249503911306%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=CnWkF%2BhmPNQmnNLXcRJePq%2FO1YdMMdCBvrBKVdACd%2Bk%3D&reserved=0(motor) What this project offers is not a controller, but Open Source software that runs on any of a shortlist of microcontrollers and uses a long list of sensors and motors. The website was a project design walk-through. This is also, as you can see very low cost, he is using a $5 driver board from eBay. What they are saying is that small steppers have better performance and use less power when driven using their closed-loop algorithm. But it does require that you place a current sensor (Hall effect or in in-line resister) on both phases and drive the stepper with a PWM capable pair of full-H-bridges. What is going on is the control software is measuring current and forcing it to have the desired waveform against the inductance and mechanical loads. https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fyoutu.be%2Fzcb86TRxTxc&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Cc21d1504e33b42a15eaf08d9d535a470%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637775249503911306%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GXOX24h9HBSe3wGa%2BTwmhzw7vMc3E0SGfFUrAfZL8gw%3D&reserved=0 Here is the project website https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsimplefoc.com%2F&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Cc21d1504e33b42a15eaf08d9d535a470%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637775249503911306%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=0xzqDAizMu8CL9EgF0yVHA7pXwJJUf%2BQ72JUBh8Zpu0%3D&reserved=0 -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Cc21d1504e33b42a15eaf08d9d535a470%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637775249503921326%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=Rv%2BriLj8Cg5KjS8l6PQ2VWG6K%2FRg4%2BHcIqi0jH2Hvr8%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
