Commutation instant detector for sensorless drive of BLDC motor

Kim, T.Y.; Lyou, Joon

doi:10.1049/el.2011.1956

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…The DC-link current measured by the sampling resistor and quantised by the AD is used for both current control and phase extraction to extract commutation error. The commutator will switch the three-phase bridge power tubes for commutation by delaying the ZCPs θ^ degree θ^= θ o − θ^e (18) As in (18), θ o = 30° is the original advanced angle between ZCPs and ideal commutation points, θ^ is superimposed by the extracted commutation error θ^e and θ o . θ^ above 30 indicates that the commutator needs to delay more to compensate for the already advanced commutation, while θ^<30 indicates that the commutator will reduce the delay to compensate for the already lagged commutation.…”

Section: Commutation Error Compensation Methods Based On Commutation Ementioning

confidence: 99%

“…Among them, the back-EMF zerocrossing point (ZCP) detection method is still the most feasible solution due to its simplicity and reliability. It is implemented by observing the ZCPs of phase to neutral point or line-to-line voltage [18,19]. However, the high-frequency modulation of the inverters will interfere with the terminal voltage, resulting in many highfrequency burr signals, especially for low inductance motors, which will lead to inaccurate detected commutation points and trigger mis-commutation.…”

Section: Introductionmentioning

confidence: 99%

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Commutation error rapid compensation for brushless DC motor based on DC‐link current phase extraction method

Liu

Chen

Zheng

et al. 2020

IET Electric Power Applications

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In order to reduce the torque ripple and running loss caused by the commutation error in the brushless DC motor (BLDCM) of the magnetically suspended control moment gyroscope (MSCMG), this study proposes a novel method dealing with commutation error in sensorless controlled BLDCM by rapid phase extraction and compensation technique. First, a traditional virtual neutral point circuit consisted of three-phase resistance network and low-pass filter are used to obtain the zero-crossing points of the non-conducting phase back electromotive force without noise interference. Then, an improved phase extraction method is built after analysing the DC-link current. Commutation error is extracted from DC-link current with the improved phase extractor rapidly. Furthermore, the effect of speed offset caused by fluctuation during phase extraction is also analysed and an adaptive commutation error compensation method based on the DC-link current phase extraction is proposed. Finally, simulation and experimental results performed on the high-speed motor of MSCMG verify its effectiveness and rapidity. The main novelties of this study are the direct phase extraction algorithm with natural parameter insensitivity and robustness and the rapid iterative commutation error compensation method based on the extraction algorithm.

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Section: Commutation Error Compensation Methods Based On Commutation Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Commutation error rapid compensation for brushless DC motor based on DC‐link current phase extraction method

Liu

Chen

Zheng

et al. 2020

IET Electric Power Applications

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“…The method using the line voltage differences to detect the ZCPs of the phase back EMFs is suggested in [14], where the 30 electrical degrees phase shift is still unavoidable. The research in [15]- [17] proposed the line-to-line voltage ZCPs detection method without the motor neutral voltage to determine the commutation instants directly. However, the position detection error due to the phase delay of the LPF and the voltage drop on the stator resistance still cannot be neglected [18].…”

Section: Introductionmentioning

confidence: 99%

Position Sensorless Control Without Phase Shifter for High-Speed BLDC Motors With Low Inductance and Nonideal Back EMF

Fang

et al. 2016

IEEE Trans. Power Electron.

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1 Abstract-This paper presents a novel method for position sensorless control of high-speed brushless dc (BLDC) motors with low inductance and nonideal back electromotive force (EMF) in order to improve the reliability of the motor system of a magnetically suspended control moment gyro (MSCMG) for space application. The commutation angle error of the traditional line-to-line voltage zero-crossing points (ZCPs) detection method is analyzed. Based on the characteristics measurement of the nonideal back EMF, a two-stage commutation error compensation method is proposed to achieve the high reliable and high accurate commutation in the operating speed region of the proposed sensorless control process. The commutation angle error is compensated by the transformative line voltages, the hysteresis comparators and the appropriate design of the low-pass filters (LPFs) in the low speed and high speed region respectively. High precision commutations are achieved especially in the high speed region to decrease the motor loss in steady state. The simulated and experimental results show that the proposed method can achieve an effective compensation effect in the whole operating speed region.Index Terms-Brushless dc (BLDC) motor, position sensorless control, back electromotive force (EMF) detection.

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“…Many position sensorless control schemes for BLDCM drive have been reported in the literature [15][16][17][18][19][20][21][22][23]. Estimation of phase back emf using the terminal voltage sensing has been most widely used technique to extract rotor position information.…”

Section: Introductionmentioning

confidence: 99%

“…However, a phase delay of 30⁰ is achieved due to phase back-emf sensing which has to be compensated by the use of analog filter [15]. This phase delay problem has been removed in line back emf sensing methods, but the phase delay due to low pass filtering and effect of voltage drop at the stator windings has to be considered [16,17].…”

Section: Introductionmentioning

confidence: 99%

Power factor correction in sensorless BLDC motor drive

Bist

Singh

2014

2014 IEEE 6th India International Conference on Power Electronics (IICPE)

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This work presents a sensorless brushless DC motor (BLDCM) drive with power factor correction (PFC). The speed control of BLDCM is achieved by varying the DC bus voltage of the voltage source inverter (VSI) feeding BLDCM. The BLDCM is electronically commutated using a VSI operating at low frequency switching for reducing the switching losses in VSI. A canonical switching cell (CSC) converter is used for varying the DC bus voltage of VSI. This CSC converter is operated in discontinuous inductor current mode (DICM) for achieving a power factor correction (PFC) inherently without any sensing requirement. The rotor position sensors are eliminated by using sensorless control of BLDCM. Hence, a sensorless BLDCM drive is developed as a cost effective solution for low power applications. Its performance is evaluated on a developed prototype at various speeds with unity power factor (UPF) at AC mains.

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Commutation instant detector for sensorless drive of BLDC motor

Cited by 17 publications

References 4 publications

Commutation error rapid compensation for brushless DC motor based on DC‐link current phase extraction method

Commutation error rapid compensation for brushless DC motor based on DC‐link current phase extraction method

Position Sensorless Control Without Phase Shifter for High-Speed BLDC Motors With Low Inductance and Nonideal Back EMF

Power factor correction in sensorless BLDC motor drive

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