1. SEPES
  2. All Volumes and Issues
  3. Volume 6, Number 1, 2024
  4. An Influence of the Time and Spatial Harmonics on an Electromagnetic Torque of a Symmetrical Six-Phase Induction Machine With a Six-Step Inverter Supply Under Open Phase Circuit Fault

An Influence of the Time and Spatial Harmonics on an Electromagnetic Torque of a Symmetrical Six-Phase Induction Machine With a Six-Step Inverter Supply Under Open Phase Circuit Fault

SEPES.
2024;
Volume 6, Number 1
: pp. 95 - 104
Authors:
  1. Mykola Semeniuk
  2. Andriy Kutsyk
  3. Valerii Misurenko
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University
3
Lviv Polytechnic National University, Department of Electromechatronics and Computerized Electromechanical Systems

Six-phase induction machines offer several advantages over traditional three-phase machines, including higher levels of electromechanical compatibility with loads, energy efficiency, and fault tolerance.

This article presents an analysis of the impact of harmonics in the winding distribution function in the stator slots and the harmonics of the machine’s supply on its electromechanical compatibility with the load during a single-phase failure.

Using the developed mathematical model, which accounts for spatial harmonics of the six-phase induction machine and time harmonics from the stator windings powered by a six-step voltage source inverter, the interaction of spatial and time harmonics in the phase failure mode and their effects on the electromagnetic torque and copper losses of the machine are analyzed. Specifically, in the normal (healthy) operating mode, the interaction of the first spatial harmonic with the 5th, 7th, 11th, and 13th time harmonics leads to the emergence of the 6th and 12th harmonics in the electromagnetic torque. Similar harmonics appear in the electromagnetic torque when the first time harmonic interacts with the 5th, 7th, 11th, and 13th spatial harmonics.

Under open single-phase fault in the six-phase induction machine, additional harmonics, including the 2nd, 4th, 8th, and 10th, appear in the electromagnetic torque. The second harmonic, caused by the reverse sequence component of the field, has the most significant impact on the electromagnetic torque. Notably, in this mode, the 6th and 12th harmonics in the electromagnetic torque decrease due to the absence of stator current under open phase fault.

Copper losses in the six-phase induction motor, which are caused by time and spatial harmonics, decrease under phase open fault. This is attributed to the absence of higher harmonics from the missing phase and the reduction in the THD for the currents of the healthy phases.

symmetrical six phase induction machine
electromechanical compatibility
open-circuit fault
six-step voltage source inverter
mathematical modeling
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