Indirect sensing for rotor flux position of permanent magnet AC motors operating over a wide speed range

Moreira, J.C.

doi:10.1109/28.556643

Cited by 181 publications

(51 citation statements)

References 4 publications

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“…Methods which utilize the third harmonic component of the back EMF are attractive since they are relatively simple and potentially low cost. To date, however, their performance has been reported only for BLDC motors operating under normal commutation, i.e., without commutation advance or flux weakening [3], [13]. In this paper, the utility of the third harmonic back-EMF method is demonstrated for the sensorless operation of both BLDC and BLAC drives.…”

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

“…1 shows a schematic of a permanent-magnet brushless drive with Y-connected resistors to enable the third harmonic component of the back EMF to be sensed. In the literature, three methods for obtaining the third harmonic voltage have been proposed: 1) from the voltage between the star point " " of the resistor network and the neutral point " " of the stator windings [3], [13], [14]; 2) from the voltage between " " and the midpoint " " of the dc bus [13]; and 3) from the voltage between " " and " " [15]. These are evaluated in detail as follows.…”

Section: Evaluation Of Methods For Extracting Thirdmentioning

confidence: 99%

“…It was assumed in [13] that the back-EMF waveforms of the two energized phases were identical and instantaneously sum to zero. Thus, (3) was rewritten as (4) Itwouldappear,therefore,thatthethirdharmoniccomponentof thebackEMFcouldbeextractedfrom .However,thisassumptionisonlyvalidwhentheback-EMFwaveformistrapezoidalwith aflat top electrical,whichisnotgenerallythecaseinpractice.…”

Section: B Voltagementioning

confidence: 99%

“…In this paper, the utility of the third harmonic back-EMF method is demonstrated for the sensorless operation of both BLDC and BLAC drives. Three methods have been proposed to extract the third harmonic component of the back EMF [3], [13]- [15]. These are evaluated and the most appropriate is identified and implemented for the sensorless control of both BLDC and BLAC drives, including operation in the flux-weakening mode.…”

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

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Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Shen

Zhu

Howe

IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03.

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Abstract-The sensorless control of brushless machines by detecting the third harmonic back electromotive force is a relatively simple and potentially low-cost technique. However, its application has been reported only for brushless dc motors operating under normal commutation. In this paper, the utility of the method for the sensorless control of both brushless dc and ac motors, including operation in the flux-weakening mode, is demonstrated.Index Terms-Back electromotive force (EMF), brushless drives, permanent-magnet machines, sensorless control.

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Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

Section: Evaluation Of Methods For Extracting Thirdmentioning

confidence: 99%

Section: B Voltagementioning

confidence: 99%

Section: Sensorless Flux-weakening Control Of Permanent-magnet Brushlmentioning

confidence: 99%

See 2 more Smart Citations

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Shen

Zhu

Howe

IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03.

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“…J. C. Moreira proposed a method that can extract third harmonic component from the stator phase voltage while the fundamental and other polyphase component are eliminated via a simple summation of three phase voltage [4]. S. Ogasawara proposed a sensorless drive based on conducting state of free-wheeling diodes connected in antiparallel with power transistors [5].…”

Section: Introductionmentioning

confidence: 99%

Disturbance Observer Structure Applied to Sensorless Brushless DC Motors Drive

Wang¹,

Chin-Hsuan²,

Lee³

2015

IJCTE

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Abstract-In a permanent magnet (PM) brushless dc motor (BLDC), the performance of Hall effect sensors are not reliable in some applications. The back electromotive force (back-EMF) signal is used instead since the zero-crossing points of back-EMF can be used to provide the rotor position information. In this paper, a new back-EMF difference detection method based on disturbance observer is proposed. The proposed structure can detect the back-EMF as well as back-EMF difference signal. The zero-crossing points of the back-EMF difference can be used directly for commutation, requiring no phase shift. Simulation and experiment results are provided to show the feasibility of the proposed method.

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A practical sensorless commutation method based on virtual neutral voltage for brushless DC motor

2017

IEEJ Transactions Elec Engng

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This paper presents a low‐cost and highly practical sensorless control method for brushless DC (BLDC) motor drives. The developed methodology can generate an accurate commutation signal for the BLDC motor by sensing the back electromotive force zero‐crossing point through the virtual neutral voltage of the motor. Since commutation control is critical for the BLDC motor control, a voltage‐controlled phase shifter comprising a hysteresis comparator and voltage‐controlled resistor is proposed in order to perform phase compensation at different speeds and prevent rapid output oscillations due to noise or high‐frequency ripples in the virtual neutral voltage. Finally, several experiments have been performed on a prototype motor to verify the theoretical analysis and demonstrate the practicality and reliability of the proposed sensorless drive method. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Indirect sensing for rotor flux position of permanent magnet AC motors operating over a wide speed range

Cited by 181 publications

References 4 publications

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Sensorless flux-weakening control of permanent magnet brushless machines using third-harmonic back-EMF

Disturbance Observer Structure Applied to Sensorless Brushless DC Motors Drive

A practical sensorless commutation method based on virtual neutral voltage for brushless DC motor

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