LCI Motor Parameter Estimation via Commutation Intervals

The patent uses commutation interval information as an intermediary to bridge the gap between limited sensor measurements and accurate motor parameter estimation. By detecting the commutation interval from available voltage measurements and using it to calculate motor power, commutation inductance, and firing angle, the system achieves high measurement precision without requiring additional sensors or complex hardware configurations

The patent replaces direct physical measurement mechanisms (additional current sensors, voltage sensors) with computational methods based on electrical principles. Instead of mechanically adding more sensors to the system, the invention uses mathematical relationships and signal processing of existing measurements to derive accurate motor parameters, substituting hardware complexity with intelligent algorithms

The patent enables the LCI system to estimate motor parameters using its own existing measurements and control information. The commutation interval detection utilizes the motor side ac-voltage measurements already taken for control purposes, and the controller's internal models, allowing the system to self-diagnose and monitor its own performance without external measurement devices

The patent makes the existing sensor infrastructure serve multiple functions. The motor side ac-voltage sensors, originally used only for control, are repurposed to also provide commutation interval information for parameter estimation. This multi-functional use of existing sensors eliminates the need for dedicated measurement sensors while maintaining high estimation accuracy