A Novel Technique for Two-Phase BLDC Motor to Avoid Demagnetization

Yazdan, Tanveer; Zhao, Wenliang; Lipo, T.Α.; Kwon, Byung-il

doi:10.1109/tmag.2016.2521874

Cited by 25 publications

(13 citation statements)

References 8 publications

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“…Back-EMF estimation is made either directly from the analytical modeling or through magnetic flux density (B M ) plots obtained from Numerical Methods (NMs). Moreover, demagnetization faults excite harmonics at multiples of mechanical frequency in the stator back-EMF and current spectrum [19] as given in (10).…”

Section: A Demagnetization Fault Modelingmentioning

confidence: 99%

“…Similar work has been done by J. Urresty in [18] who has diagnosed the demagnetization effect with a zero-sequence voltage and current signatures. The authors in [19], [20] has proposed some techniques for a fault tolerant system in case of demagnetization fault. A recent publication of B. Akin et.al, in [21] discusses about the SITF fault severity for a PMSM considering residual voltages and current.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Analysis of Demagnetization Faults in BLDC Motors Using Novel Hybrid Electrical Equivalent Circuit and Numerical Based Approach

Usman

Rajpurohit

2019

IEEE Access

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Brushless Direct Current (BLDC) motors are the type of Permanent Magnet Synchronous Motors (PMSMs) with trapezoidal back-EMF. Due to high proliferation of BLDC motors in industrial applications, these motors are extensively been operated for longer durations. During the continuous heavy operation, these motors are subjected to environmental, physical and thermal stresses which can lead to faults. Fault can be on the stator windings or on the Permanent Magnets (PMs) of the rotor of a machine, which can manifest into electrical quantities like currents and/or voltages, magnetic quantities like flux density and thermal characteristics of a machine. This paper shall explore in detail about the demagnetization fault in PMs of a BLDC motor. Modeling of a machine can be done through different available techniques such as Electrical Equivalent Circuit (EEC) based method or analytical method which accounts several assumptions in order to simplify the analysis. While the Numerical Methods (NM) such as Finite Element Method Magnetics (FEMM) gives more authoritative solutions. This paper aims to combine both these approaches and contribute by developing a novel Hybrid EEC-FEMM model for a closed loop BLDC motor drive using a Hysteresis Current Control (HCC) technique. The developed model is simulated both under healthy and faulty conditions. In order to simulate the effects of fault in the machine, demagnetization is introduced in the PM through various methods like change in magnetic coercivity, placement of broken magnets, partial demagnetization and lastly by replacement of a PM with a non-magnetic material which is an extreme case of demagnetization. The investigation on the machine performance through change in quantities like stator current, back-EMF, electromagnetic torque, mechanical speed and magnetic flux density is analyzed. Further using the Maxwell 2D tool, a Finite Element (FE) model of a BLDC motor is developed and its performance is examined under both healthy and demagnetization fault conditions. The experimental validation of demagnetization fault supports the inferences drawn from the simulation results. INDEX TERMS Brushless direct current (BLDC) motors, demagnetization, electrical equivalent circuit (EEC), finite element method (FEM), hysteresis current control (HCC), numerical method (NM), permanent magnet (PM), permanent magnet synchronous motors (PMSMs).

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Section: A Demagnetization Fault Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Demagnetization Faults in BLDC Motors Using Novel Hybrid Electrical Equivalent Circuit and Numerical Based Approach

Usman

Rajpurohit

2019

IEEE Access

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“…This paper outlines the AF topology for the only‐pull drive technique considering the back‐EMF profile as compared with radial flux topology. The topology of an RFPM motor with 16 slots and 18 poles (16S18P) presented in [3] is shown in Fig. 1 a .…”

Section: Topologies Operating Principle and Design Featuresmentioning

confidence: 99%

“…Most of the applications demand sinusoidal or trapezoidal back-electromotive force (EMF) waveforms depending on the drive techniques selected for the desired operation of PM machines [1,2]. Recently, the design of a radial flux PM (RFPM) motor with non-trapezoidal back-EMF was investigated for the only-pull drive technique [3]. This work reveals the deviation of the back-EMF profile from the expected trapezoidal shape resulting in low-average torque and high-torque ripples.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic design and performance analysis of a two‐phase AFPM BLDC motor for the only‐pull drive technique

Yazdan

Kwon

2018

IET Electric Power Applications

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This study proposes a two-phase single-air-gap axial flux permanent magnet (AFPM) motor that offers a trapezoidal back-electromotive force (EMF) waveform to improve the performance of the only-pull drive technique compared with the radial flux PM (RFPM) motor. The only-pull drive technique provides the benefit of allowing the use of thin magnets in the motor without suffering from irreversible demagnetisation. In the proposed motor, the design geometry is primarily considered to achieve the desired trapezoidal shape of back-EMF. The effects of the geometry are explained with the help of air-gap flux density, flux linkage, and the leakage flux. Both the radial flux and the proposed motor adopt the same design concept and hold equal electromagnetic loadings. The profile of back-EMF and the electromagnetic torque driven by the only-pull drive technique are compared with that of RFPM motor with non-trapezoidal back-EMF. Furthermore, the split configuration is proposed for the AFPM motor to reduce torque ripples. The demagnetisation analysis is performed to confirm the operating point of the magnets in a split-AFPM motor. The results reveal that the AF motor is a good candidate for the only-pull drive technique.

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Design and analysis of a two-phase brushless DC motor with hybrid permanent magnet material for only-pull drive technique

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A Novel Technique for Two-Phase BLDC Motor to Avoid Demagnetization

Cited by 25 publications

References 8 publications

Comprehensive Analysis of Demagnetization Faults in BLDC Motors Using Novel Hybrid Electrical Equivalent Circuit and Numerical Based Approach

Comprehensive Analysis of Demagnetization Faults in BLDC Motors Using Novel Hybrid Electrical Equivalent Circuit and Numerical Based Approach

Electromagnetic design and performance analysis of a two‐phase AFPM BLDC motor for the only‐pull drive technique

Design and analysis of a two-phase brushless DC motor with hybrid permanent magnet material for only-pull drive technique

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