2results about How to "Eliminate harmonics" patented technology

The present application relates to the technical field of flat wire motor, and discloses a flat wire motor suitable for different parallel branch windings. In the present application, Y / 2+1 kinds of hairpins are needed to realize the design of motor windings, the kinds of hairpins are less, and the mold opening cost and equipment cost are reduced; in the motor production, the production efficiency is increased. In the single unit of the present application, two kinds of same-layer hairpins and one kind of cross-layer hairpin group are adopted, so that different branch numbers can be obtained through simple series connection or parallel connection of the unit, and the unit is suitable for 1 branch, 2 branches and 4 branches, thereby improving the universality of the unit of the present application, facilitating product serialization, and achieving the purpose of reducing the manufacturing cycle. In addition, the unit composed of the three kinds of hairpin combinations forms a "short distance" arrangement form, which is beneficial to eliminate harmonics.

The application discloses a modulation method for suppressing common-mode voltage high-frequency harmonics. The method re-synthesizes a virtual voltage vector, adopts a virtual voltage vector to synthesize a reference vector, and adopts effective vectors with opposite phases to synthesize a zero vector, so that common-mode voltage waveforms between carrier periods are completely identical and positive and negative polarity acting time is equally divided. According to the characteristics of the common-mode voltage waveform, the modulation strategy can completely eliminate harmonics at even multiple carrier frequencies and sideband harmonics near each carrier frequency while reducing the common-mode voltage amplitude, and effectively reduces the adverse effects caused by the common-mode voltage amplitude and high-frequency harmonics. The modulation method greatly reduces the content of common-mode voltage high-frequency harmonics, reduces harmonic loss and the adverse effects of the common-mode voltage on a motor system, and has high research value and application value.