Resulting Vectors of Multiphase Winding Discrete Voltage States
DOI:
https://doi.org/10.24160/1993-6982-2023-1-25-32Keywords:
resulting voltage vectors of discrete states, resulting voltage vector of continuous rotationAbstract
A multiphase bridge converter has a certain number of logical states (digital codes) depending on the number of its diagonals (number of phases): 8 logical states for three phases, 32 for five phases, 128 for seven phases, etc. When a symmetrical multiphase winding is connected to a multiphase converter, each logical state corresponds to the resulting discrete voltage vector. At a unity input voltage of the converters, the moduli of the resulting discrete state vectors have different values.
It has been found that the maximum modulus of the resulting vector of discrete voltage states of a multiphase system is equal to the maximum-to-minimum winding line-to-line voltage ratio. With increasing the number of phases, the modulus of the resulting vector of discrete voltage states tends to the modulus of the resulting continuous rotation vector, and the discrete process becomes continuous without implementing the sine-wave pulse width modulation (SPWM) mode. This opens the possibility to increase the voltage utilization factor and improve the motor vector control quality without changing its principles.
A generalized analytical expression for the maximum modulus of the resulting discrete voltage vector of a multiphase system with an odd number of phases has been obtained.
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Для цитирования: Терешкин В.М., Гришин Д.А., Баландин С.П., Терешкин В.В. Результирующие векторы дискретных состояний напряжения многофазных обмоток // Вестник МЭИ. 2023. № 1. С. 25—32. DOI: 10.24160/1993-6982-2023-1-25-32.
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For citation: Tereshkin V.M., Grishin D.A., Balandin S.P., Tereshkin V.V. Resulting Vectors of Multiphase Winding Discrete Voltage States. Bulletin of MPEI. 2023;1:25—32. (in Russian). DOI: 10.24160/1993-6982-2023-1-25-32.
