Performance Comparison of Using Shunt-Based and Integrated Current Sensing for Sensorless Field-Oriented Control

Abstract:
Sensorless Field-Oriented Control (FOC) for 3-phase Permanent Magnet Synchronous Motors (PMSM) requires motor phase current information. This paper compares the performance of shunt-based and low-side switch integrated current sensing in terms of system efficiency and ease of use for predictive maintenance. The use of integrated current sensing in the low-side switch along with a current reconstruction algorithm doubles the information resolution and reduces the number of required components. Predictive maintenance techniques use sensed information to infer the health of the system. Integrated current sensing provides more information and better noise immunity, resulting in enhanced system performance and easier use for predictive maintenance analysis.