Secondary saliencies decoupling technique for self-sensing integrated multi-drives

The paper deals with the study and implementation of a secondary saliencies decoupling technique for self-sensing control algorithms used in multiphase motor drives and based on the injection of an additional high frequency excitation. The proposed approach can be applied to multiphase motors whose stator winding is composed of multiple three phase units suitably spatially shifted. The method exploits the spatial phase shift among the stator units to isolate undesired prominent saliency harmonics. Compared to the state of the art, this approach does not require multiple saliencies models or sophisticated filtering processes, but only the knowledge of the saliency harmonic order to be suppressed. Finite Element Analysis and Experimental results applied to a dual-three phase permanent magnet synchronous motor confirm the effectiveness of the method.