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References in periodicals archive ?
where [H.sub.[delta]] is the magnetic field strength in the air gap pack size [[delta].sub.1] between stator and rotor teeth; [K.sub.F] >1 is the coefficient taking into account ferromagnetic of the chain; [I.sub.f] and [w.sub.f] are the current and number of turns of winding; [F.sub.f] is the magnetomotive force (MMF) of the winding.
The electrical diagram layout of the investigated factory-produced three-phase motor winding and the instantaneous distribution of rotating magnetomotive force generated by this winding are presented in Fig.
Concentrated double layer full pitch coil six-phase winding and its magnetomotive force is presented in Fig.
On the basis of (7) the instantaneous space distributions of magnetomotive force in the selected moment of time are created (Fig.
The expression of conditional change of magnetomotive force in the slot of two-layer winding is the following
The same magnetomotive force [F.sub.m] acts in any of these branches
Electromagnetic properties of the two-phase windings can be evaluated by performing harmonic analysis of the rotating magnetomotive force, created by them and by calculating electromagnetic efficiency factors, based on the results of this analysis [4].
Space distributions of rotating magnetomotive force in the defined moment of time are determined according to the results from Tables 3 and 4 (Fig.
Conditional changes of magnetomotive force [DELTA]F in slots in time moment t = 0 are calculated by applying the electrical circuit layout of the considered winding (Fig.
To achieve the distribution of rotating magnetomotive force in the air gap of electric machines and the form of the curve of electromotive force induced in the windings as close as possible to sinusoidal, some certain measures are taken: the span of the windings is shortened (y < t), windings are distributed (q > 1), skewed slots are made in the magnetic circuit [1 - 2].
Kulik, "Persistent currents, flux quantization, and magnetomotive forces in normal metals and superconductors," Low Temperature Physics, vol.