performance enhancement of disk-type multi-speed wound-rotor resolver

Multi-speed resolvers are desirable position sensors for high performance closed-loop control of inverter driven machines due to their high accuracy. however, developing a winding with high number of poles with limited number of slots is a main challenge in achieving multi-speed function. therefore, in this paper different winding configuration are proposed to achieve 5-x performance of a disk type wound-rotor resolver. then, the best winding is chosen for experimental verification. in addition to the accuracy of the sensor, the optimal winding selection index is defined considering copper usage, number of winding layers (overlapping or non-overlapping configurations), the number of turns for each coil of the winding (variable or constant turn configurations), and the amplitude of the fundamental harmonic. an objective function is defined involving all the mentioned indices with different weights determined based on the importance of each index. finally, a prototype of the sensor with the best winding is built and tested. the experimental measurements verify the results of the simulations that are obtained using 3-d time setting finite element analysis.