Motor Shunt Resistor

Calculator to determine the ideal shunt resistor and amplifier combination for a given motor current limit.

Motor Shunt Resistor

Motor
Shunt
Amplifier
ADC

Notes

For BLDC motor controller shunt resistors, using a bi-directional current sense amplifier.

  • The amplifier reference is the 'mid' or 0-current voltage (the average of vref1 and vref2 in -for example- TI amps).
  • If no amplifier is used set the gain to 1 and reference to 0