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Why is low-side sensing giving less current information and ultimately not the preferred solution for motor control applications? When the shunt is on the low-side, it will sense the low side of the inverter switching from the signal value to the ground at the frequency of the PWM. When the 3-phase bridge switches off, the current measured is equal to 0. This means that it does not represent the current at the load at all times. The measurement needs then to be synchronized with the PWM to happen while the switch is on. Because of the intrinsic impedance of the current sensor, there will be a non-negligible voltage drop that causes ground shifts. This in turn causes negative voltage transients, adding further in-accuracies. So, this technique might be the most inexpensive solution as it does not require isolation, but it is coming with some drawbacks when it comes to the accuracy of the measurement and the amount of information provided.
