Research and development of the 4X-variable reluctance resolver

Effect of damper winding on accuracy of wound‐rotor resolver under static‐, dynamic‐, and mixed‐eccentricities

“…It can be seen that using damper winding improved the performance characteristic of the healthy and faulty resolver. In fact when distributed winding is employed for the stator and the rotor of the resolver, damper winding has no significant effect on the performance of the healthy resolver [4]. However, using on‐tooth winding the damper winding causes a significant improvement in healthy and faulty condition.…”

“…Although sensor less control of electrical machines has many advocates, its drawbacks such as vibration at zero start‐up due to uncertain rotor position, make them unsuitable for high‐accuracy applications. In such applications, usually encoders and resolvers are used [1–4]. The challenges of optical encoders make resolvers the only choice for many applications where the sensor has to be worked accurately in polluted environments over a wide range of speeds, temperature, and vibration [4–8].…”

“…The primary coil of RT is located on the stator and fed by the excitation voltage and the induced voltage in the secondary coil of the RT that is located on the rotor of the resolver is used for feeding the rotor winding [3]. The difficulties in using RT and the requirements of using low‐price resolvers pushed the researchers into proposing a new generation of resolvers with no‐winding on the rotor [4, 6–20]. Most of these resolvers work based on sinusoidal variation of air‐gap permeance that can be attained by sinusoidal variation of air‐gap length [6–13] or sinusoidal variation of coupling area [18–20].…”

“…There are many works on performance evaluation of WR resolvers [4, 7, 21–27]. Many previous works have analysed the performance of WR radial flux resolvers (RFRs) [23–27].…”

“…This is because the air‐gap length remains constant in AFRs under SE; the only difference from fully aligned resolvers is the change in the coupling area of the stator and rotor. In [4, 22], the optimal dimensions of the rotor are calculated to achieve maximum accuracy. However, there is no report on performance analysis of WR resolvers under dynamic‐ and mixed‐eccentricities (DE and ME).…”