Hi
i build some sort of DC motor speed controller:
**broken link removed**
It works fine,
soft-start works, reverse works, forward and turbo modes also works
but problem is that torque is lost (somehow) no more wheel spinning in toy car. Stall torque is low
But top speed looks the same.
U can say that's because of soft-start, but even if i let wheels spin (not touching ground at all) and after that i put it on ground - it stops after short time.
Earlier it was with IRF540N mosfet in use, but i changed it to IRLZ34N (lower turn-on Vgs), but almost nothing changed.
As R1 resistor (potentiometer) is variable i tried to make duty cycle of 555 timer 100% (upper side 10K oms, lower 0 oms) and in that case torque becomes as it was before adding new controller. (wheel spinning, almost good for drifting)
But as soon i set R1 to about 95% duty cycle (upper side 9.5K oms, lower - 0.5K oms) torque is lost It looks like half (50% or more) of torque is away
I tried C1 1uF and 100nF, almost no difference in torque - only sound of motor changes about 100Hz and 1Khz, sounds funny, but it does not matters, or should i go for higher frequencies? 10Khz? 20Khz 100Khz? (motor is similar to Speed 400 6V)
I hope that my description is clear, if not please let me know i'll try to clarify it.
Thanks for ideas
i build some sort of DC motor speed controller:
**broken link removed**
It works fine,
soft-start works, reverse works, forward and turbo modes also works
but problem is that torque is lost (somehow) no more wheel spinning in toy car. Stall torque is low
But top speed looks the same.
U can say that's because of soft-start, but even if i let wheels spin (not touching ground at all) and after that i put it on ground - it stops after short time.
Earlier it was with IRF540N mosfet in use, but i changed it to IRLZ34N (lower turn-on Vgs), but almost nothing changed.
As R1 resistor (potentiometer) is variable i tried to make duty cycle of 555 timer 100% (upper side 10K oms, lower 0 oms) and in that case torque becomes as it was before adding new controller. (wheel spinning, almost good for drifting)
But as soon i set R1 to about 95% duty cycle (upper side 9.5K oms, lower - 0.5K oms) torque is lost It looks like half (50% or more) of torque is away
I tried C1 1uF and 100nF, almost no difference in torque - only sound of motor changes about 100Hz and 1Khz, sounds funny, but it does not matters, or should i go for higher frequencies? 10Khz? 20Khz 100Khz? (motor is similar to Speed 400 6V)
I hope that my description is clear, if not please let me know i'll try to clarify it.
Thanks for ideas