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"ideal" PWM frequency is about one tenth the time constant of L/R, where L is the inductance of the motor, and R is the winding resistance. so for a motor inductance of 100mH and a DC resistance of 10 ohms, L/R=0.001 sec. 0.001x0.1=0.0001, or inverting, we get 10khz.
The diode across an inductor that clamps the voltage spike produced must conduct the current that the inductor was passing. If the motor instantaneously reverses then the current might be 200A! Your low power rectifier bridge was useless.
A complementary pair of emitter-followers can quickly turn a Mosfet on and off.
EDIT: Maybe the peak current rating of your rectifier bridge was good.
Hayato, Is this what you meant by BJT totem? Both FETs would be turned on.
Thanks,
Kinarfi
Hayato, Is this what you meant by BJT totem? Both FETs would be turned on.
Thanks,
Kinarfi
It's been a long time since I worked with resonance, so correct me if I'm wrong, please. Parallel resonance has a high input impedance, very low current and series resonance looks like a short, current limited by the resistance, so when you say look for a null, it would have the a peak voltage across the cap, well above the supply voltage.and freq is = 1/2Pi √(F L).use a sine wave and look for a null across the signal source, that's the series resonant frequency. the square wave will just serve to give confusing results because of the harmonic content