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Discussion
BLDC controller
Well, I wanna be the one to start up the new thread in the DIY forums
![]() To iterate, here's the old thread: https://www.rcgroups.com/forums/show...hreadid=181247 I won't repost any of the old stuff, let's get new stuff in! I am planning to make a prototype circuit with a programmer buildt in for easy re-flashing now. It will only be the basic module and not have any motor peripherals. I was thinking of using a pinheader and linking it to the FET-board so that I may do changes on the design more quickly. I will be experimenting with heavy filtering of the EMF signal with rpm-based table-correction of the signal phase. This should make it possible to design a very high commutation-rate controller without the need for fast ADC. |
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Re: BLDC controllerQuote:
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Well seeing we are giving current status reports,
![]() My latest PCB is almost fully populated .. just needs the FET drivers and FPGA device. Still awaiting the FETs I ordered though. Mr Takao. I ran some tests on the ADC module and over-clocked it progressively up to 2MHz while watching the stream of samples sent to my PC. Samples where within 1 bit resolution for an 8-bit sample on a RX PWM generated voltage. Not bad for device that is clocked 10 times faster than the specified spec. I am yet to try the 4MHz clock as you have done, but I am more than happy with the 6 odd uS conversion time I am getting. It has allowed me to totally rethink how I am doing some routines. Brian |
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Kreature
Here is somthing that may help you with the journey of the DIY Brushless Controller. Microchip application note AN857 http://www.microchip.com/1010/suppdo...n857/index.htm Link to all the Motor application notes. http://www.microchip.com/1010/suppdo...ntes/index.htm Martin |
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I had looked at AN587, and was really curious about the sensorless design they show. Most other designs sense all three phases, but their sensorless design has input from only one phase . If the motor is running at a fairly constant speed, this should be fine and save a few components. I would wonder however, how well it would handle startup or rapid speed changes.
Jeff |
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Takao write - previous thread
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