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Is the shunt resistor usually mounted high-side (i.e. at the positive battery terminal), or low-side (at the negative terminal), and why? Does it matter? There should be no significant difference to the measurement if the shunt resistor is on the high or low side. As the resistor is in series the absolute voltage across, and current through, the resistor ...


2

There are two reasons to throttle limit, one is obvious, the other is not necessarily obvious. The first reason is that both thrust and amperage draw grow rapidly at higher throttle values, and particularly because of the interaction of battery sag and the wattage motors will pull at the top end, it is possible to exceed the amperage of battery and ...


2

The reason why this is recommended for racers is likely due to the fact that during these high-throttle punches, the voltage of the battery sags from the load and so more current is pulled from the battery to increase the motor RPM. Power is equal to VI when V is voltage and I is current, which can be rewritten (by substitution of Ohm's law V = IR in for V) ...


2

Using PM07 power management board from Holybro as an example. They use shunt resistor on the high side. Voltage across the shunt resistor is then fed into the Texas Instruments INA169 current sense amplifier. Gain and BW of the amplifier is set using an external resistor. I was designing my own power management board recently and had exactly the same ...


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