I plan to drive a BLDC motor using a sine wave controller and will use a 500A 75mV shunt resistor (150µΩ) to measure current in the circuit, where the maximum current will be 300A. I have some questions regarding this setup:
Are there any potential issues that might arise when operating the circuit as shown in the diagram?
The voltage generated across the shunt resistor will be very low, so I need to consider the ADC input. I am planning to amplify the signal using an OP-AMP. Is it sufficient to use just the OP-AMP, or would it be better to add an external ADC, such as the ADS1115, for more precise measurements?
Would adding a capacitor help suppress high-frequency noise? Could you advise on selecting an appropriate capacitance?
Shunt Resistor vs. Hall Sensor – Which would you recommend for more accurate current measurement?
If there are any additional considerations for achieving more accurate current measurements, I would appreciate your insights.
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