Electricity: motive power systems – Induction motor systems
Reexamination Certificate
2001-06-08
2003-01-07
Masih, Karen (Department: 2837)
Electricity: motive power systems
Induction motor systems
C318S611000, C318S638000, C318S538000, C388S832000, C388S805000, C388S907500, C310S051000
Reexamination Certificate
active
06504337
ABSTRACT:
FIELD OF THE INVENTION
The field of the invention relates electric motors and more particularly to the modeling of electric motors.
BACKGROUND OF THE INVENTION
The modeling of electric motors is not a new concept. However, the main issue in modeling single phase electric motors, as opposed to poly-phase motors, is that the flux in the airgap is not uniform. This gives rise to saturation in different regions of the motor that is decidedly different than other regions. Calculating this level of saturation accurately, especially considering the distortion of the flux waveform was not something that had been attempted in previous models. Assumptions were made (false assumptions) about the symmetry of the motor and the saturation was applied according to those assumptions, which gave erroneous results. Furthermore existing models divided the motor saturation into 4 nodes: stator yoke, stator teeth, rotor yoke, rotor teeth. Accordingly, a need exists for a more reliable method of modeling electric motors.
REFERENCES:
patent: 6191510 (2001-02-01), Landin et al.
Jansen Patrick L.
Saban Daniel M.
Stevens Charles M.
General Electric Company
Masih Karen
Welsh & Katz Ltd.
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