Abstract
Multiphase electrical machines are advantageous for many industrial applications that require a high power rating, smooth torque, power/torque sharing capability, and fault-tolerant capability, compared with conventional single three-phase electrical machines. Consequently, a significant number of studies of multiphase machines has been published in recent years. This paper presents an overview of the recent advances in multiphase permanent magnet synchronous machines (PMSMs) and drive control techniques, with a focus on dual-three-phase PMSMs. It includes an extensive overview of the machine topologies, as well as their modelling methods, pulse-width-modulation techniques, field-oriented control, direct torque control, model predictive control, sensorless control, and fault-tolerant control, together with the newest control strategies for suppressing current harmonics and torque ripples, as well as carrier phase shift techniques, all with worked examples.
Highlights
Compared with conventional single-three-phase electrical machines, multiphase electrical machines are advantageous for many industrial applications that require high power rating, smooth torque, power/torque sharing capability, and fault-tolerant capability
It should be noted that while the major topics of MTP permanent magnet synchronous machines (PMSMs) systems in the existing review work are covered, this paper provides a comprehensive overview of machine topologies, modelling methods, PWM techniques, field oriented control, direct torque control, model predictive control, sensorless control, and fault-tolerant control, together with the newest control strategies for suppressing current harmonics and torque ripples, as well as carrier phase shift techniques
Multiphase PMSMs are composed of multiple individual three-phase sets, a the model of MTP PMSMs can be considered as the sum of the models of all thre machines with extra coupling voltage terms
Summary
Compared with conventional single-three-phase electrical machines, multiphase electrical machines are advantageous for many industrial applications that require high power rating, smooth torque, power/torque sharing capability, and fault-tolerant capability. The advantages of multiphase machines attract researchers to utilize them in electric and hybrid electric vehicles (EVs), e.g., on-board battery chargers for EVs with three-phase machines [14], five-phase machines [15], six-phase machines [16,17], and ninephase machines [18] They are considered preferable solutions for wind power generation systems due to the power sharing capability [19], modularity [20], additional degrees of freedom [21], and fault-tolerant capability [22,23] provided by their multiphase topologies. It should be noted that while the major topics of MTP PMSM systems in the existing review work are covered, this paper provides a comprehensive overview of machine topologies, modelling methods, PWM techniques, field oriented control, direct torque control, model predictive control, sensorless control, and fault-tolerant control, together with the newest control strategies for suppressing current harmonics and torque ripples, as well as carrier phase shift techniques. Worked examples, which were developed at the University of Sheffield, are presented in each section, whenever possible, to support the discussions
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