Hey Guys
I have been developing an electric buggy, using a brush-less three phase DC motor (BLDC).
The advantage of a BLDC is of course efficiency and control.
I have built the buggy, the MOSFET drivers (x3) and the PIC controller, and it really goes .
I got the circuit from a magazine for a high power DC motor speed controller X 3.
It is an alternator with an external fan on the belt pully, and goes so fast that I don't have to dry my hair.
After removing some spike suppression zener diodes and capacitors that kept catching fire, I noticed the main flyback protection diodes getting so hot that I could only run this ripper for about one minute.
And these diodes are huge, in a similar package to a bolt on TO-220, but twice as big.
So, I ask, 'All that flyback current that gets suppressed by these diodes and wasted as heat, surely can be harnessed in the next switching cycle'.
Any ideas ?
I have been developing an electric buggy, using a brush-less three phase DC motor (BLDC).
The advantage of a BLDC is of course efficiency and control.
I have built the buggy, the MOSFET drivers (x3) and the PIC controller, and it really goes .
I got the circuit from a magazine for a high power DC motor speed controller X 3.
It is an alternator with an external fan on the belt pully, and goes so fast that I don't have to dry my hair.
After removing some spike suppression zener diodes and capacitors that kept catching fire, I noticed the main flyback protection diodes getting so hot that I could only run this ripper for about one minute.
And these diodes are huge, in a similar package to a bolt on TO-220, but twice as big.
So, I ask, 'All that flyback current that gets suppressed by these diodes and wasted as heat, surely can be harnessed in the next switching cycle'.
Any ideas ?