Abstract
The usage of multiphase electrical drives expands the operation possibilities of electrical machines and opens new directions of research on inverter-fed electrical machines. With an increasing number of phases, the standard approach of the electromagnetic design of machines has to be generalized to m-phase systems, which is not usually respected in the literature focused on electric machine design, and it is rarely published. This paper summarizes the specific problems linked with the design of machines with different numbers of phases, focusing on the winding design and the calculation of equivalent circuit parameters. In addition to the direct effect of different numbers of phases, the impact of injecting higher order time harmonic components on the electromagnetic design of electric machines is analyzed. The obtained analytical results are verified by the measurement of a nine-phase experimental induction motor.
Highlights
The ever-increasing public and political interest in the environment in the last two decades has had a significant impact on the global transportation industry
This feature has already been described in detail in [6,7,8], and its greatest benefits are the possibility of increasing the power density due to harmonic injection and the possibility of changing the number of pole pairs without winding switch-over
The presented procedure has been verified by finite element analysis (FEA) and by the measurement of a nine-phase induction machine prototype
Summary
The ever-increasing public and political interest in the environment in the last two decades has had a significant impact on the global transportation industry. To meet the increasing emission requirements, personal, public, and special vehicle manufacturers are replacing their internal-combustion-engine-based drives with battery-powered electric machines. In addition to the advantages that benefit from the higher number of phases (lower vibration, lower power per phase, etc.), the multiphase machines have a feature that is generally referred to in the literature as additional degrees of freedom This feature has already been described in detail in [6,7,8], and its greatest benefits are the possibility of increasing the power density due to harmonic injection and the possibility of changing the number of pole pairs without winding switch-over. The presented procedure has been verified by finite element analysis (FEA) and by the measurement of a nine-phase induction machine prototype
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