![]() ![]() ![]() ![]() The fact that you are asking this question implies you are not aware that the phase sequence table was written for a bi-polar supply motor controller (+Vcc/-Vee, not uncommon) and that the single supply equivilent of the DC- are the L1, L2, 元 control lines.since In case you or anyone else are wondering what sequence I will be using I attached a photo of it. What is another way to turn negative on and off?Īnd once I figure out how to turn the negative on and off for each motor phase wire I will then write the PWM current Sequence that will function of the readings of the Hall sensors. I believe this is because it came in contact with the 5 volts. My main question is how do you switch on and off a negative voltage with a n-channel Power Mosfet, because if you look at the schematic in the first post, you will see the mosfet labeled 'M4' whenever I applied 5 volts from the arduino to the the gate it turned negative on but sparked. There are American brushless motor controllers that I have found but they are 100-300$ each which is unreasonable.Īs I stated in my first post "I am aware that the brushless motors need a PWM phase current sequence in order to rotate, right now I'm just performing tests to make sure my circuit can make each Phase wire turn positive, turn negative, and neutral." Most of the Chinese controllers are programmed specifically for ebikes. I have tried ordering Chinese brushless motor controllers but there's always issues like: the reverse function only works if the motors are completely stopped, which is a huge issue because self-balancing scooters need to be able to reverse instantaneously. I haven't been able to find a cheap 48v brushless that will work for the self balancing scooter that I am almost done building. The reason I am building a controller instead of buying one is for these reasons: I did not buy a brushless motor controller, I am designing a brushless motor controller from scratch. I might have not made my question clear enough for you, and I've been building circuits for years, I'm just new to the H-Bridge concept. I know that many brushless motor h bridge circuits use PNP and NPN transitors but I have seen it done only using n channel power mosfets which is what Im trying to do.Īny suggestions or ideas will be greatly appreciated.Ĥ8v 1000watt Dc hub motor with hall sensors attached But Switching phase wires to negative has been unsuccessful. I have successfully made each phase wire turn positive voltage on and off, I used the battery ground and the positive of the phase wire for my multimeter. I am aware that the brushless motors need a PWM phase current sequence in order to rotate, right now I'm just performing tests to make sure my circuit can make each Phase wire turn positive, turn negative, and neutral. So my question is, were there sparks because 'M4' is switching the negative wire on but the 5v high input of the gate came in contact with the negative? How else would I switch the negative wire on? Would the 470uf capacitor be better than the 1000uf for this circuit? Also I tried testing the circuit using a 12v battery and a arduino uno, I was mainly seeing whether or not I could get a voltage reading with my multimeter from 2 of the motor phase wires but when I turned 'M1'(show in schematic) High and 'M4' High some sparks shot out but I quickly turned off the mosfet and did not damage it. I did not use the 630uf capacitor, will that be a problem? I have 470uf capacitors and 1000uf capacitors but not 630uf. I have also added hall sensor inputs for the arduino. I used six STP80NF70 N-channel mosfets, instead of the STP40NF20 mosfets used in the schematic. I found a schematic and I attached an image of it. I have just finished soldering my brushless motor controller circuit and I have a few questions on how to use it. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |