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A semi-analytical method for calculating high-frequency electromagnetic force of motor by constructing low-frequency harmonic current

A technology of harmonic current and electromagnetic force, which is applied in the semi-analytical field of constructing low-frequency harmonic current and calculating the high-frequency electromagnetic force of a motor, can solve problems such as large errors, and achieve the advantages of reducing the amount of simulation calculation, saving calculation time, and reducing errors. Effect

Active Publication Date: 2019-03-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006]Aiming at the above defects or improvement needs of the prior art, the present invention provides a semi-analytic method for constructing low-frequency harmonic currents to calculate the high-frequency electromagnetic force of the motor, thus Solve the technical problem of large errors in the existing technology when the frequency conversion speed regulation is running

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  • A semi-analytical method for calculating high-frequency electromagnetic force of motor by constructing low-frequency harmonic current
  • A semi-analytical method for calculating high-frequency electromagnetic force of motor by constructing low-frequency harmonic current
  • A semi-analytical method for calculating high-frequency electromagnetic force of motor by constructing low-frequency harmonic current

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Embodiment 1

[0074] (1) Determine the operating conditions of the motor, obtain the waveform of the current, and perform Fourier decomposition on the current to obtain the amplitude and phase of the fundamental frequency component and each harmonic component. In this embodiment, the speed of the 12-slot 10-pole surface-mounted permanent magnet synchronous motor is 1200 rpm, the current contains fundamental waves and harmonics, the fundamental frequency is 100Hz, the amplitude is 25A, and the amplitude of the harmonics is 1A, the frequency is 5kHz. The current waveform is as Figure 5 As shown, its spectrum is shown as Figure 6 shown.

[0075] (2) Establish the finite element model of motor electromagnetic field and electromagnetic force analysis, pass the fundamental frequency current obtained in step (1) into the model, and construct a low-frequency current harmonic, the frequency of this current harmonic is the fundamental frequency Integer multiples of . Here the low-frequency harm...

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Abstract

The invention discloses a semi-analytical method for calculating high-frequency electromagnetic force of a motor by constructing low-frequency harmonic current, which comprises the following steps of:obtaining a current waveform according to the operation condition of the motor; performing Fourier decomposition on the current based on the current waveform to obtain the amplitude and frequency ofthe fundamental frequency current and each harmonic current; constructing The low frequency harmonic current by using the fundamental frequency current, and the distribution of electromagnetic field and obtaining force in the motor by finite element simulation of the motor with the fundamental frequency current and the low frequency harmonic current. Decomposing The distribution of electromagneticfield and force by two-dimensional Fourier transform in time and space, and obtaining the electromagnetic field and force related to low frequency harmonic current. For the electromagnetic fields andforces related to the low frequency harmonic currents, obtaining the electromagnetic fields and forces introduced by each harmonic current by mapping the frequency and amplitude. The invention has high computational efficiency when the variable frequency speed regulation is operated. The invention has high computational efficiency when the variable frequency speed regulation is operated.

Description

technical field [0001] The invention belongs to the field of motor design, and more specifically relates to a semi-analytic method for calculating the high-frequency electromagnetic force of a motor by constructing a low-frequency harmonic current. Background technique [0002] When the motor is driven by a frequency converter, there are abundant harmonics in addition to the fundamental wave in the armature current. These current harmonics mainly include low-frequency harmonics related to the fundamental frequency of the motor, such as the 6k±1 (k=1, 2, 3, ...) sub-harmonics in the three-phase motor, and the harmonics introduced by the frequency converter. High-frequency harmonics, the frequency of which mainly exists near the switching frequency of the inverter and its multiplier. Although the amplitude of these current harmonics is small, the high-frequency magnetic field generated interacts with the fundamental frequency magnetic field to generate a large high-frequency ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 方海洋李大伟曲荣海徐云松
Owner HUAZHONG UNIV OF SCI & TECH
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