Short-Circuited Rotor Windings for Improving the Electromagnetic Saliency for Inductance- and Resistance-Based Self-Sensing Control

Self-sensing control of electrical machines has been a challenging topic in the field of control of electrical machines in the last years. This strategy can be used to omit the encoder, which has positive impact on the cost and the volume of the electrical machine. In this work, a concept for the improvement of the self-sensing capability of an electrical machine with surface mounted magnets by applying short-circuited windings on the rotor will be presented. These windings are supposed to increase the electromagnetic saliency that is required for an electrical machine to be suitable for self-sensing control. First, the manufacturing process will be described shortly. Second, the parameters that are necessary for self-sensing control will be presented for inductance- as well as resistance-based saliency tracking. The parameters were identified on a test bench. Finally, the influence of the concept on the total losses of the machine will be evaluated by measurement results.