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In power engineering, winding factor is a technique that is employed to improve the rms generated voltage or electromotive force (EMF) in a three-phase AC electrical machine so that the output voltage and hence torque does not have any harmonics in it which may reduce efficiency. This is because the armature winding of each phase is distributed in a number of slots. Since the EMF induced in different slots are not in phase, their phasor sum is less than their numerical sum. This reduction factor is called distribution factor Kd. Another factor that can reduce the winding factor is when the slot pitch is smaller than the pole pitch, called pitch factor Kₚ.
Calculation and optimization methods for winding coefficients of coreless motors
This application discloses a method for calculating and optimizing the winding coefficient of a coreless motor, comprising: constructing a radial magnetic induction intensity model of the permanent magnet considering three-dimensional effects / axial magnetic field attenuation based on the geometric and material parameters of the permanent magnet; calculating the axial efficiency factor of the winding based on the winding geometric parameters and the radial magnetic induction intensity model of the permanent magnet, the axial efficiency factor including the straight-side axial efficiency factor and the inclined-side axial efficiency factor; modifying the traditional pitch factor formula based on the axial efficiency factor to obtain the pitch factor considering the three-dimensional effect of the magnetic field of the coreless motor, and calculating the total winding coefficient of the winding based on the pitch factor. The accuracy of the three-dimensional distribution of magnetic induction intensity and the winding coefficient of the coreless motor calculated by this method is close to the three-dimensional finite element simulation results, while reducing the calculation time from several hours to milliseconds, achieving high precision and high efficiency.
Owner:ZHEJIANG UNIV