Investigating the Influence of PWM-Driven Cascaded H-Bridges Multilevel Inverter on Interior Permanent Magnet Synchronous Motor Power Losses

Claudio Nevoloso (), Gioacchino Scaglione, Giuseppe Schettino, Antonino Oscar Di Tommaso, Fabio Viola, Ciro Spataro and Rosario Miceli
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Claudio Nevoloso: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Gioacchino Scaglione: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Giuseppe Schettino: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Antonino Oscar Di Tommaso: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Fabio Viola: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Ciro Spataro: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy
Rosario Miceli: Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy

Energies, 2025, vol. 18, issue 15, 1-24

Abstract: This paper presents an accurate analysis of the power losses of an interior permanent magnet synchronous motor fed by a cascaded H-bridge multilevel inverter. The main goal of this study is to investigate the impact of the cascaded h-bridge inverter, multicarrier PWM strategies, and inverter switching frequency on the synchronous motor power losses. With this aim in mind, a detailed frequency domain power analysis was carried out on motor power losses at different operating points in the frequency–torque plane. Motor power losses were further categorized into fundamental and harmonic power losses. This evaluation involved driving the power converter using six distinct multicarrier PWM strategies at four different switching frequencies. Additionally, a comparison was conducted with a conventional two-level PWM inverter to quantify the reduction in motor power losses. The experimental results show that the cascaded h-bridge inverter guarantees a notable increase in the motor efficiency, up to 7%, and losses in segregation at the fundamental frequency, if compared to the standard two-level PWM inverter, especially at low speed and with partial-load conditions. Such results mark out the cascaded H-bridge inverter as a valuable choice, also with regard to low-voltage drive applications.

Keywords: IPMSM drives; CHBMI; VSI; power measurement; power losses; harmonic power losses (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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