Abstract
More degrees of freedom not only enable multiphase drives to be fault-tolerant but also allow non-sinusoidal electromotive forces (NS-EMFs) in high-quality vector control. NS-EMFs lead to lower costs of design and manufacturing of electrical machines. However, the presence of multi-harmonics in NS-EMFs possibly generates pulsating torque in both healthy and faulty conditions of multiphase drives. To facilitate the use of NS-EMFs, this two-part study proposes control schemes to adaptively improve torque quality of multiphase drives in dealing with multi-harmonics of NS-EMFs. The proposed schemes are based on a simple but effective type of artificial intelligence, Adaptive Linear Neuron (Adaline). The knowledge of multiphase drives including the harmonic ranks of NS-EMFs and the rotor position is exploited to design the online-trained optimal Adalines. The first part of this study is to propose a control scheme using an Adaline for healthy mode with high-quality torque regardless of numerous harmonics in NS-EMFs. The second part of this study introduces a control scheme using another Adaline for open-circuit faults. The proposed schemes are numerically and experimentally validated on a seven-phase permanent magnet synchronous machine (PMSM) possessing a high total harmonic distortion (THD = 38%) of NS-EMFs.
Highlights
Multiphase drives can continue to properly operate under fault conditions without any additional hardware, leading to fault-tolerant property [1,2]. This present paper proposes a new control scheme for better utilization of more degrees of freedom of multiphase drives in healthy mode, obtaining smooth torque with multi-harmonics existing in non-sinusoidal electromotive forces (NS-EMFs) and phase currents
19th, 11th) of NS-EMFs with the proportions described in Figure 5 are used to model the are controlled byThesix previously six harmonic seven-phase machine
The first part of this study has proposed a control scheme for healthy mode in which torque quality of multi-harmonic NS-EMF multiphase drives is adaptively improved
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Multiphase drives can continue to properly operate under fault conditions without any additional hardware, leading to fault-tolerant property [1,2] This present paper proposes a new control scheme for better utilization of more degrees of freedom of multiphase drives in healthy mode, obtaining smooth torque with multi-harmonics existing in NS-EMFs and phase currents. In the first part of this study, an Adaline-based control scheme for healthy mode of multiphase drives is proposed to obtain smooth torque, regardless of multi-harmonics existing in NS-EMFs. The proposed control scheme is a combination of the classical. The proposed control scheme can be applied to other electric machines with different numbers of phases and NS-EMF waveforms This part of the study is an extension of [23] with additional explanations and experimental results.
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