2results about How to "Reduce waveform distortion rate" patented technology

The utility model relates to the technical field of generators, and discloses a stator punching sheet, which comprises a stator punching sheet body, the outer contour of the stator punching sheet body is provided with four arcs, and the appearance of the stator punching sheet body is provided with four cut edges. Eight 'W'-shaped weld grooves are circumferentially arranged on the outer contour of the stator punching sheet body, 30 'U'-shaped wire embedding grooves are circumferentially arranged on the inner contour of the stator punching sheet body, and a 'T'-shaped tooth portion is arranged between every two adjacent wire embedding grooves. According to the stator punching sheet, only a punching die of the stator punching sheet needs to be fixed, the original assembly mode of a generator is not changed, 30 U-shaped wire embedding grooves are circumferentially arranged on the inner contour, the utilization rate of materials is improved, the number of the U-shaped wire embedding grooves of the stator is changed, the efficiency of the generator can be improved, the waveform distortion rate is reduced, and the power generation quality is improved. Electromagnetic noise is reduced, reactive power consumption of the generator can be reduced, and output power of the generator is improved.

This invention provides a filtering method, apparatus, frequency converter, and storage medium. The filtering method includes: obtaining a filtering capacitor based on the cable length between the frequency converter and the motor; obtaining a filtering inductor based on the motor's rated parameters; and filtering the voltage signal to be output to the motor using the filtering inductor, the filtering capacitor, and a pulse width modulation waveform determined based on both, to obtain a filtered voltage signal. This invention improves the accuracy of filtering parameter calculation, reduces computational complexity, lowers the waveform distortion rate and phase voltage amplitude of the input voltage signal at the motor end, and reduces harmonics in the voltage signal.