Patent ID: 9175984
Filing Date: 2015-11-03
Classification: G01D

Abstract:
1. A system for determining an initial rotor position of an interior permanent magnet (IPM) machine having a rotor and a stator, the system comprising: a drive circuit in operative and electrical communication with each phase of the IPM machine; and a controller in electrical communication with the drive circuit, the controller configured to engage the drive circuit to selectively apply a voltage signal to each phase of the stator of the IPM machine, detect a current signal through each phase corresponding to the applied voltage signal, and calculate the initial rotor position based on a least squares analysis between at least the voltage signal, the current signal and a predefined inductance of the IPM machine including both self-inductance and mutual inductance associated with the IPM machine, the controller configured to calculate the initial rotor position based at least partially on the following equation: