Design-Oriented Modelling of Axial-Flux Variable-Reluctance Resolver Based on Magnetic Equivalent Circuits and Schwarz–Christoffel Mapping

Optimal Winding Selection for Wound-Rotor Resolvers

“…Resolvers are one of the most common position sensors in industrial applications. In industries with special circumstance, where there is wide temperature variation, high vibration level, and polluted environments, resolvers are the most promising choice [1] - [3].…”

“…VR resolvers work based on sinusoidal variation of air-gap reluctance. In this regard, two types of VR resolvers emerge: sinusoidal air-gap length (SAGL) resolvers [3] - [9] and sinusoidal area (SA) resolvers [10]- [14]. The commercial VR resolvers are SAGL types.…”

“…Despite acceptable accuracy of that resolver, it has an excessive axial length in comparison with conventional SAGL resolvers. To improve the resiliency of the SAGL resolver under eccentricities, disk type resolvers are proposed [3], [9]. Furthermore, SA resolvers are also proposed to overcome the disadvantages of the SAGL resolvers [10].…”

Proposal of new windings for 5‐X variable reluctance resolvers

“…Furthermore, variable reluctance (VR) resolvers have no winding on rotor and easily integrated with motors [1,[8][9][10][11][12][13]. Since they do not need rotary transformer (RT) to transfer excitation voltage to the rotor, they have more thermal stability with respect to the wound rotor resolvers and there is no concern about leakage flux of RT and phase shift error due to equivalent impedance of RT [14][15][16]. Finally, VR resolvers can be built with the same pole number of PM machines to measure the rotor position absolutely.…”

“…VR resolvers work based on sinusoidal variation of air-gap reluctance. Therefore, there are two types of VR resolvers: sinusoidal air-gap length [1,6,15,[17][18][19][20][21] and sinusoidal coupling area [5,16,22,23]. The first type is produced commercially and there are many works on winding proposal for them [6,[19][20][21].…”