Recent content by matt_in_mtl

walls99, thanks for the reply. That method makes good sense. -Matt

walls99, that's super cool! I think yours is the first controller I have seen that implements closed loop control for slow speed commutation. Do you have any references to your 6-position scanning method? Also, have you seen http://scolton.blogspot.com/? He has some interesting ideas on PMAC...

Excellent thread Ricky, top notch! You may have stumbled on it already, but I think you may find this blog interesting: http://scolton.blogspot.com/search/label/3ph He is doing the most thorough work on BLDC and BLAC motor design/controller design that I have seen (granted, i don't have an...

The infinieon blew it's FET after I abused it :evil: The Turnigy has no built in current limiting, I am sure that it would have also blown. -Matt

gwhy, yeah I have been watching your thread. :D I can`t recall exactly what my ratio was, but it worked out to about 30 - 35mph no load based on kv of the motor at 48V. The 15mph was not the top speed, I did not get a chance to test that, the controller blew too soon. I think I was in the...

Short answer: no you cannot long answer: the serial port on your computer uses the rs232 protocol which has signals from -12V to +12V, with a '1' bit being 3-12V, and '0' being -3 to -12V. Your ttl serial port on the infineon micro uses 0-5v signals, with a '0' being ~+5V and '1' being ~0V...

When you say the controller was limiting to 40amps is this between the battery and the controller? The current between the controller and the motor is always equal or larger (can be much larger) than the current between the battery and controller. This means that at partial throttle you could...

When you plug in the USB-TTL adapter, if it is properly installed it should create a new COM port This will show up under ports in the device manager. To get there go: Right–click My Computer, click Manage, and then click Device Manager If a new port is created, make note of it's number...

and don't forget our British members propensity towards using words like Antipodean? :lol: Good post Jeremy, well said. -Matt

Yeah, apparently :D to be fair I knew I was pushing it, and am not too surprised that it blew. Also, I was nowhere near 40A from the battery, more like 20A peak, I suspect it was hitting 75amp phase current limit which really hurt it. I have opened it up, and the fet that blew also melted it's...

Well, I thought it might be time for an update. The bike has moved under it's own power. I got the motor up and running as discussed using an RC speed controller, and also ordered a 6-fet infineon controller. I have mad a couple topics on the forum since then about trying to program the...

Well... that was fun. I found 30amp phase to be a little anemic, and it was only drawing 8amps from the battery, so I upped the battery current to 40 amp ;-) and set the phase to 75 amp ( note this is with stock fets ;-) ) it was a lot better, and there was NO cutting out... except after a...

OK, time for some more test results (this time with pictures :P ) I pulled out the usb scope and soldered some test leads to the positive sides of the shunt (after removing my previous shunt mod), C20, and C19. The following were done with my previous settings of 30A. Here is the first test...

Awesome job guys! I for one am very excited, I think we may have just cracked this egg!! :lol: Now who was that testing the mini-monster 6-fet who was having high power cutting out problems, they may be interested in hearing about this? -Matt