Dynamic Eccentricity and Demagnetized Rotor Magnet Detection in Trapezoidal Flux (Brushless DC) Motors Operating Under Different Load Conditions

Rajagopalan, S.; Roux, W. le; Habetler, T.G.; Harley, R.G.

doi:10.1109/tpel.2007.904183

Cited by 137 publications

(72 citation statements)

References 8 publications

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“…Multi-phase winding is wound in the stator slots which creates rotating magnetic field in the air gap of motor. Magnetic flux of PMs is crossed through the air gap and travels into the stator core and then returns back to rotor [2].…”

Section: Design Parameters Of Bldc Motormentioning

confidence: 99%

Healthy BLDC Motor Simulation Using Finite Element Analysis

2017

IJAERD

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Section: Design Parameters Of Bldc Motormentioning

confidence: 99%

Healthy BLDC Motor Simulation Using Finite Element Analysis

2017

IJAERD

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“…The ratios of irreversible demagnetization patterns are N-pole 50%, S-pole 60% and N-pole 50%, S-pole 70%. Cracks and chips from manufacturing defects and physical damages can lead to demagnetization [15], [16]. In this case, only one of N-pole and S-pole can be demagnetized.…”

Section: B Inequality Demagnetization Pattern Of Pmsmentioning

confidence: 99%

Demagnetization Detection for IPM-type BLDCMs According to Irreversible Demagnetization Patterns and Pole-Slot Coefficients

Kang¹,

Kim²,

Park³

et al. 2016

Journal of Power Electronics

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This paper proposes a method for detecting irreversible demagnetization using the harmonic analysis of back electromotive force (BEMF) in interior permanent magnet-type brushless DC motors. First, demagnetization patterns, such as equality, inequality, and weighted demagnetizations, are defined and classified by considering the possibility of demagnetization resulting from motor operating characteristics. Second, an available diagnostic model for the harmonic analysis of BEMFs is defined according to pole-slot coefficients because the characteristics of BEMFs under demagnetization conditions are affected by the combination of poles and slots. Third, BEMFs and their harmonic components under normal and demagnetization conditions are analyzed through simulation and experiment to verify the proposed demagnetization detection technique.

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“…This goal can be obtained either by an opportune choice of the permanent magnet pole arc or by suitable short-pitch stator windings. Taking into account (5), (6), (8), (9), (13), (14), (15), (16) and (17), the space vectors 1 S e and 3 S e of the back-emf, can be expressed as shown in (23) and (24), which emphasize the low order harmonic content of the back-emf space vectors. (24) show that the effect of the local demagnetization increases with the harmonic order, being Δγ multiplied by the field harmonic order.…”

Section: Surface-mounted Pmsg Modeling and Control Descriptionmentioning

confidence: 99%

“…In [13], an exhaustive investigation of the impact of the control strategy and even the tuning of the speed regulator was considered as potential criteria for the selection of the appropriate motor fault diagnosis technique. The on-line detection of rotor magnet demagnetization for three-phase PM synchronous generators has been already studied in several papers, using motor current signature analysis, rotor flux estimation, or torque constant average value [14]- [18]. In this paper, a current-controlled fivephase surface-mounted permanent magnet generator is considered.…”

mentioning

confidence: 99%

Effect of the closed-loop control on the diagnosis of rotor demagnetization in five-phase surface-mounted permanent magnet generators

Gritli

Tani

Mengoni

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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Multiphase permanent-magnet generators are an attractive alternative for a variety of emerging applications owing to their reliability and dynamic performance such as hybrid traction systems. In this context, diagnosing the status of the rotor magnets is crucial for improving the reliability of the generators. The effect of the closed-loop control system cannot be neglected when the fault detection process is based on the signature analysis of electrical variables. Therefore, investigating the relevance of the bandwidth of the control system on the induced fault component is mandatory.In this paper, the detectability of the demagnetization of the rotor magnet trailing edges, due to large stator currents, in five-phase surface-mounted permanent magnet synchronous generators, is investigated. The theoretical analysis is validated by means of numerical simulations.Index Terms--Five-phase permanent magnet generators, rotor demagnetization, FOC, fault diagnosis.

show abstract

Dynamic Eccentricity and Demagnetized Rotor Magnet Detection in Trapezoidal Flux (Brushless DC) Motors Operating Under Different Load Conditions

Cited by 137 publications

References 8 publications

Healthy BLDC Motor Simulation Using Finite Element Analysis

Healthy BLDC Motor Simulation Using Finite Element Analysis

Demagnetization Detection for IPM-type BLDCMs According to Irreversible Demagnetization Patterns and Pole-Slot Coefficients

Effect of the closed-loop control on the diagnosis of rotor demagnetization in five-phase surface-mounted permanent magnet generators

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