High-speed permanent magnet motor permanent magnet loss compensation method and system considering time-space harmonic conditions

Abstract

The invention discloses a high-speed permanent magnet motor permanent magnet loss compensation method and system considering time-space harmonic conditions, and belongs to the field of alternating current motor loss analysis and calculation. A high-speed permanent magnet motor powered by a variable-frequency power source serves as a research object, Fourier analysis is conducted on input phase current of the permanent magnet motor, current excitation under each harmonic wave is obtained, and a two-dimensional finite element eddy-current loss model is established; and according to mathematical derivation, a compensation calculation model of the permanent magnet eddy current loss after compensation under each harmonic excitation and the permanent magnet eddy current loss of the high-speed permanent magnet motor under the harmonic condition is obtained, and through superposition of the permanent magnet loss after compensation under each harmonic, the calculation amount is reduced, and the efficiency of permanent magnet loss compensation is improved. According to the high-speed permanent magnet motor permanent magnet loss compensation method considering the time-space harmonic condition, the calculation result of a permanent magnet eddy current algorithm considering an eddy current non-axial path is about 30% more than that of a conventional two-dimensional finite element algorithm.

Description

technical field [0001] The invention belongs to the field of loss analysis and calculation of AC motors, and in particular relates to a compensation method and system for permanent magnet losses of high-speed permanent magnet motors that take into account space-time harmonic conditions. Background technique [0002] High-speed permanent magnet motors have the advantages of small size, high efficiency, simple control, high power density, high power factor, good control performance, great development potential, and wide application range. High-speed permanent magnet motors have shown great application potential in five major fields including high-precision CNC machine tools, aerospace equipment, new energy vehicles, electric power equipment, and high-performance medical equipment. While high-speed permanent magnet motors bring their own advantages, they also increase the difficulty of their analysis and design. One of the difficulties in the research of high-speed motors is t...

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a high-speed permanent magnet motor permanent magnet loss compensation method and system that takes into account space-time harmonic conditions, aiming at solving the problem that the eddy current calculation model in the prior art cannot simultaneously consider high The technical problems of uneven distribution of eddy current under high frequency, non-axial loss of eddy current and additional eddy current loss generated by various space-time harmonics

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