Thrust & CapacitorX
Thrust Thrust
CapacitorX CapacitorX
Thrust Thrust
Hey, I’ve been tinkering with a new turbo‑charged electric motor for a racing airframe, but the voltage spikes are throwing off the throttle response. I need a precision eye on the waveform to smooth it out—think you can help?
CapacitorX CapacitorX
CapacitorX: Your throttle feels like it's being slapped by a stray pulse. Let me write a quick log: **Schematic snippet** ``` Gate driver → Rg=10Ω → Gate of MOSFET MOSFET drain → Csnubber=100nF → Source Catch diode (Schottky) across drain‑source ``` Drop the 100 nF and a 10 Ω resistor. It should tame the di/dt spikes and give you a smoother voltage wave. Log the waveform before and after—if it still jitter, the driver’s drive current is the culprit. Keep the gate‑drive voltage steady, not 12 V or 18 V; 10 V is usually the sweet spot. After this tweak, re‑measure. If the throttle is still off, we’ll need to dig into the PWM dead‑time. I’ll file the results in the log.
Thrust Thrust
Thanks for the quick fix—let’s drop that snubber and resistor, log the waveforms, and see if the throttle smooths out. If not, we’ll crank the driver up and tweak the dead‑time. Bring the data and we’ll tackle it head‑on.
CapacitorX CapacitorX
Got it, I’ll log the waveforms with the snubber and resistor removed, and I’ll check the current draw on the gate driver. If the throttle still stutters, I’ll push the driver’s voltage higher in 1 V steps and adjust the dead‑time in 100 ns increments. I’ll file the data now, then we’ll review the plots together.
Thrust Thrust
Sounds good—let’s get those plots and see how fast we can clean up that throttle jitter. Bring the data, and we’ll tweak the driver like a fine‑tuned prop.Need to ensure no tags.Got it, looking forward to the logs—let’s see if we can smooth that throttle out faster than a jet stream.
CapacitorX CapacitorX
Logging waveforms now. I’ll start with a 0.1 µF snubber removed and 10 Ω gate resistor removed. I’ll record the drain voltage at 1 µs resolution, gate voltage, and current draw. After the first sweep I’ll compare the peak-to-peak swing. If the throttle still responds sluggishly, I’ll step up the gate drive by 1 V increments and adjust the dead‑time in 100 ns increments. Data will be in the log folder. Let's see what the numbers say.
Thrust Thrust
Nice plan—get those numbers down, and let’s see if we can smooth that throttle faster than a jet cruise. Keep me posted on the plots.
CapacitorX CapacitorX
Waveforms logged, throttle still jittery. Peak swing is 4.3 V, driver at 12 V. I’ll bump the gate drive to 13 V and set dead‑time to 400 ns. Sending the updated plot.Plot updated, driver now at 13 V, dead‑time 400 ns. The voltage swing is down to 3.7 V peak‑to‑peak, throttle response smoother. Next step: try 14 V and 500 ns dead‑time if needed. I'll keep logging.