![]() ![]() ![]() Thanks a lot, and sorry if this is off-topic. Hall effect sensors are not required for sensorless control. Sensorless control has two distinct advantages: lower system cost and increased reliability. A simple approach of detecting back EMF using comparator and RC filter is defined. Sensorless control of a BLDC motor calls for commutation based on the Back Electromotive Force (BEMF) produced in the stator windings. It’s the VIN full voltage (PVDD in the schematics) through the same voltage divider (68k/5.1k) and through the same voltage follower that the BEMF signals are sent. Keywords: -BLDC (Brushless DC Motor), RC filter, back EMF. It would make the wiring easier…Īnd not related to that (or is it?), what’s the purpose of the VPDD-OUT pin on this board? Something like this:Īs the BEMF outputs signals in this board are buffered and through a voltage divider, could I create this virtual neutral after the outputs of the opamp that buffers the voltage? It’s the MCP6004, in the schematics. Each with one pin in one phase and the other pin common to all of them, right? And add a comparator to each phase with this virtual neutral. If not, I could add three resistors wired in each phase. In this particular board, this “virtual neutral” doesn’t exist as an output pin, right out of the box, correct? So I need to compare each BEMF to a virtual neutral point between all the phases. But to be able to read it and perform the commutation sequence, I need to find the zero crossing of each phase. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |