Affiliations: [a] Department of Electrical Engineering, Harbin Institute
of Technology, Harbin, Heilongjiang, China | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Hao Wang, Department of Electrical
Engineering, Harbin Institute of Technology, No. 92, Xidazhi Street, Nangang
District, Harbin 150001, Heilongjiang, China. E-mail:
wanghao861128@gmail.com
Abstract: Electrical error which contains amplitude error, function error and
zero error has a direct impact on accuracy of resolver when resolver is used as
a angle measuring device in control system. Harmonic interference existing in
the output electromotive force (EMF) of signal windings is the main influencing
factor of function error. Therefore, the reduction of harmonic interference
will greatly weaken function error. In this paper, an axial flux
variable-reluctance (AFVR) resolver with short pitch distributed winding is put
forward on the basis of former variable-reluctance resolver. By the analyses of
finite element method (FEM), high order harmonic of output EMF makes the
distortion of EMF waveform and causes errors. Furthermore, the change
regulation of high harmonics in the output EMF is got. The optimization
analysis is done to rotor shape, pole-pairs and each group teeth number of this
new resolver. Through FEM analysis and discussion on the optimized AFVR
resolver, the analytic results show that the influence of harmonic interference
is seriously weakened, and measurement accuracy is upgraded.
Keywords: Electromotive force (EMF), finite element method (FEM), high order harmonic, function error
