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Theory and characteristics of novel variable reluctance 1X resolver
Author(s) -
Ishizaki Akira,
Takasaki Kazuhiko,
Shimomura Shoji,
Masaki Kouichi,
Kitazawa Kanji
Publication year - 1996
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391160512
Subject(s) - resolver , permeance , stator , engineering , electromagnetic coil , control theory (sociology) , magnetic reluctance , rotor (electric) , rotary variable differential transformer , delta wye transformer , linear variable differential transformer , transformer , air gap (plumbing) , electrical engineering , wound rotor motor , voltage , magnet , distribution transformer , computer science , materials science , induction motor , permeation , control (management) , artificial intelligence , membrane , biology , genetics , composite material
Although brushless resolvers have been used widely as angular position transducers, they are expensive due to their intricate construction, involving a rotary transformer to supply the exciting coils wound on the rotor poles with the current. It is shown theoretically in this paper that the resolver without rotary transformer or brushes can be realized by simple construction, which consists of the stator core with both 4‐poles exciting windings and 2‐poles output ones and the rotor core carrying no windings. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos θ, where θ represents the angular position of a point in the air gap with respect to the origin on the rotor, the point of minimum air gap. The method determining the rotor form to embody the aforementioned gap permeance variation is also shown. It has been confirmed not only by simulation but also experiment that the 2‐phase output voltages of a model designed based on the theory have sinusoidal waveforms with very small harmonic contents. Moreover, the rotor position detected by processing the output voltages through the conventional resolver/digital converter was within acceptable engineering accuracy.