Abstract
The interest in multiphase machines for high power and reliable drives has been growing, and many control algorithms have been proposed to improve their torque performance. This article presents a new approach to the modeling of a multi three-phase drive, aiming at the minimization of the torque ripple introduced by the pulsewidth modulation (PWM) voltage excitation, by the shift of carrier phase angles among different three-phase inverters. The underlying idea is to use standard three-phase converters feeding the individual segment and to apply a phase shift between the PWM carriers. For the torque ripple analyzed in this article, only the interaction between the armature field, resulting from the PWM voltage excitation, and the fundamental component of the permanent-magnet field is considered. The proposed carrier phase-shift angles are obtained for a case study of a sectored triple three-phase synchronous permanent-magnet machine. Analytical, numerical and finite-element analysis results are presented to explain how the carrier shift angles affect the current and torque ripple. Finally, experimental results are presented to validate the model and the control algorithm.
Highlights
Multiphase drives are well known for being a suitable solution for high power systems such as ship propulsion, electric vehicles and More Electric Aircraft applications [1]–[6]
This paper proposes an analytical model of the torque ripple generated in a sectored multi three-phase machine fed by a Pulse Width Modulation (PWM) control of multi three-phase modular converters
The experimental setup consists of three three-phase inverters with standard IGBT modules, a sectored triple three-phase PMSM with its cross section shown in Fig. 2, and a centralized controller
Summary
Multiphase drives are well known for being a suitable solution for high power systems such as ship propulsion, electric vehicles and More Electric Aircraft applications [1]–[6]. In high power systems the power electronics must bear high currents (or voltages) and the switching frequency of the power semiconductor is usually limited (below 30 kHz) [20]–[23]. This results in significant high frequency current ripple caused by the PWM of the DC/AC converter [24], [25]. This paper proposes an analytical model of the torque ripple generated in a sectored multi three-phase machine fed by a PWM control of multi three-phase modular converters. Starting from the model, a method for the torque ripple reduction by applying CPS-PWM technique to the multi threephase inverters is defined. Numerical and FEA simulations are presented and validated by experimental tests
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