Current Control for Dual Three-Phase Permanent Magnet Synchronous Motors Accounting for Current Unbalance and Harmonics

Hu, Yashan; Zhu, Z. Q.; Liu, Kan

doi:10.1109/jestpe.2014.2299240

Cited by 206 publications

(24 citation statements)

References 48 publications

(91 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has the benefit that in an event of fault(s) in one 3-phase set, the other set does not need to reconfigure its controller. Alternatively, the two 3-phase sets may be controlled as a single unit by employing "vector-space decomposition" (VSD) algorithm [38]. While the VSD may be a better option for symmetrical nx3-phase machines, it requires control reconfiguration under fault conditions.…”

Section: ) Control Systemmentioning

confidence: 99%

Enhanced Availability of Drivetrain Through Novel Multiphase Permanent-Magnet Machine Drive

Patel

Wang

Nugraha

et al. 2016

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

Abstract-This paper deals with novel multi-phase permanent magnet machine drive to enhance drivetrain availability in electric traction applications. It describes the development of new winding configurations for 6-phase permanent magnet (PM) brushless machines with 18-slot, 8-pole, that eliminate and/or reduce undesirable space harmonics in the stator magnetomotive force (MMF). In addition to improved power/torque density and efficiency with a reduction in eddy current loss in rotor permanent magnets and copper loss in end-windings, the developed winding configuration also enhances availability of drivetrain, in a variety of applications requiring a degree of fault tolerance, by employing it as two independent 3-phase windings in a 6-phase interior permanent magnet machine (IPM), which is designed and optimized for a given set of specifications for an electric vehicle (EV), under thermal, electrical and volumetric constraints. The paper also describes the design and development of 6-phase inverter with independent control for both sets of 3-phase windings. The designs of the motor and the inverter are validated by a series of preliminary tests on the prototype machine drive.Index Terms-Electric vehicle, fractional-slot, inverter control, multiphase, permanent magnet machines, power drivetrain. I. INTRODUCTIONERMANENT MAGNET (PM) brushless machines have been increasingly used in a variety of applications ranging from high speed manufacturing [1], electric and hybrid vehicle traction [2], ship propulsion [3], aerospace actuation [4] to wind power generation [5]. To improve torque density and efficiency, and to reduce torque ripple, a relatively newer Manuscript received December 28, 2014; revised March 19, 2015 and April 13, 2015; accepted April 16, 2015. Copyright (c) 2015 IEEE. Personal use of this material is permitted. However, permission to use this material for any other purposes must be obtained from the IEEE by sending a request to pubs-permissions@ieee.org.This work was supported in part by the European Commission for CASTOR project under European Green Vehicles Initiative (EGVI) through Grant No. 260176.V. I. Patel, and J. Wang are with the Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S1 3JD, United Kingdom (e-mail: v.i.patel@ieee.org, j.b.wang@sheffield.ac.uk). D. T. Nugraha, and R. Vuletić are with the Automotive System Engineering Team, Infineon Technologies AG, Munich, 85579, Germany (email: dian.nugraha@infineon.com, radovan.vuletic@infineon.com winding configuration for PM brushless machines, which is often referred to as fractional-slot concentrated or modular, has recently emerged [2], [6], [7], [8]. It offers numerous advantages over the overlapped distributed winding in conventional PM brushless machines, which include simple manufacturing due to concentrated coils of the phase around one tooth or alternate teeth [9], higher copper packing factor and lower end-winding losses resulting into high efficiency [10], and reduced probability of inter...

show abstract

Section: ) Control Systemmentioning

confidence: 99%

Enhanced Availability of Drivetrain Through Novel Multiphase Permanent-Magnet Machine Drive

Patel

Wang

Nugraha

et al. 2016

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

show abstract

“…The symmetrical multiphase machines are usually those with odd phase numbers, like five-phase [4,9,19], seven-phase [20], and nine-phase [21] machines. And most of the machines with even phase numbers are in asymmetrical structures [5,[14][15][16], which have less torque pulsations than those in symmetrical structures [22]. Therefore, the following discussion focuses on the symmetrical multiphase systems with odd phase numbers.…”

Section: Symmetrical Components For Symmetrical Multiphase Systemsmentioning

confidence: 99%

“…7 (b), it can be concluded that the sampling frequency does not have a significant influence on the imbalance of the phase currents, either. Actually, as is discussed in [14][15][16] and [24], the asymmetry in the machine parameters is the major reason for the imbalance problem, while the difference in the characteristics of power modules would also have an effect. …”

Section: Experimental Verificationmentioning

confidence: 99%

“…Therefore, to extend the motor life and suppress the torque ripple, the current imbalance should be eliminated. Some research have been done to deal with the unbalanced currents of multiphase inverters in [13][14][15][16]. For five-phase induction machines under RFOC, two pairs of Manuscript synchronous PI controllers are employed in [13]; but because of limited bandwidth, they cannot compensate the imbalance in some cases when negative sequence currents appear in the α β − or x y − subplanes [14].…”

Section: Introductionmentioning

confidence: 99%

“…For five-phase induction machines under RFOC, two pairs of Manuscript synchronous PI controllers are employed in [13]; but because of limited bandwidth, they cannot compensate the imbalance in some cases when negative sequence currents appear in the α β − or x y − subplanes [14]. For dual three-phase induction machines, anti-synchronous PI controllers in the x-y subplane [14,15] and second-order harmonic compensators in α β − subplane [16] are suggested to compensate the current imbalance between the two three-phase winding sets and the imbalance between phase windings in each three-phase set, respectively. However, these above literatures dealt with current imbalance problem are focused on a specific type of multiphase machine.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current Balance Control for Symmetrical Multiphase Inverters

Liu

Zheng

et al. 2016

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

The current imbalance between stator phase windings could shorten the motor life and affect the drive performance, whereas in case of multiphase drive applications, there is not a general current balance control strategy that can apply to symmetrical inverters with any phase number m. Based on the generalized Symmetrical Component Theory, this letter analyzed the values of relative symmetrical components of multiphase systems in balanced and unbalanced cases. Then developed from the conventional Rotor-flux Oriented Control (RFOC), the current-balance RFOC is proposed to compensate the current imbalance for symmetrical m-phase inverters. Finally, experiment results from the five-phase and nine-phase drive systems confirm the validity of the control strategy in eliminating current imbalance. Index Terms-Multiphase, voltage source inverter (VSI), current imbalance.ɶ I can be called positive and negative k th

show abstract