Sensorless commutation and speed control of Brushless DC-machine drives based on the back-EMF symmetric threshold-tracking

Darba, Araz; Belie, Frederik De; Melkebeek, Jan

doi:10.1109/iemdc.2013.6556141

Cited by 15 publications

(18 citation statements)

References 12 publications

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“…As soon as the back-emf crosses the threshold added with the same delay which was applied before, the commutation action is triggered. Simulation results in [13] verified the performance of this method in detecting the exact moment of commutation which affects the transient states of the drive. In this paper different experimental aspects of implementation of the proposed method will be discussed and the results will New trends in industry as well as academic area are more towards replacing micro-controllers with newer generation of processing units which are FPGA's aimed to reach the optimum point of cost and technology.…”

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confidence: 68%

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FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for Brushless DC-machines

Darba

Belie

Salem

et al. 2013

2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and P

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Abstract-The operation of brushless DC permanent-magnet machines requires information of the rotor position to steer the semiconductor switches of the power-supply module which is commonly referred to as Brushless Commutation. Different sensorless techniques have been proposed to estimate the rotor position using current and voltage measurements of the machine. Detection of the back-electromotive force (EMF) zero-crossing moments is one of the methods most used to achieve sensorless control by predicting the commutation moments. Most of the techniques based on this phenomenon have the inherit disadvantage of an indirect detection of commutation moments. This is the result of the commutation moment occurring 30 electrical degrees after the zero-crossing of the induced back-emf in the unexcited phase. Often, the time difference between the zero crossing of the back-emf and the optimal current commutation is assumed constant. This assumption can be valid for steadystate operation, however a varying time difference should be taken into account during transient operation of the BLDC machine. This uncertainty degrades the performance of the drive during transients. To overcome this problem which improves the performance while keeping the simplicity of the back-emf zero-crossing detection method an enhancement is proposed. The proposed sensorless method operates parameterless in a way it uses none of the brushless dc-machine parameters. In this paper different aspects of experimental implementation of the new method as well as various aspects of the FPGA programming are discussed. Proposed control method is implemented within a Xilinx Spartan 3E XC3S500E board.Index Terms-Permanent-magnet brushless DC-machine (BLDC-machine), back-EMF zero-crossing, sensorless control, field-programmable gate arrays (FPGAs)

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confidence: 68%

“…In [13], the authors have proposed a method which after a predefined small delay from the last switching event that can be generated by start-up sequence, a voltage sample of the unenergized phase is obtained. By using this sampled value a threshold is defined for the back-emf of the same phase.…”

mentioning

confidence: 99%

FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for Brushless DC-machines

Darba

Belie

Salem

et al. 2013

2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and P

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show abstract

“…During speed transients this assumption leads to a degradation of the performance of the drive. The technique proposed in [2] and [3] is employed together with the current reference optimisation.…”

Section: Proposed Current Optimisationmentioning

confidence: 99%

“…The most frequently used self-sensing method for BLDC drives is to detect the back-EMF zero-crossing moments. Examples of the use of zero-crossings detection can be found in [2], [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Improving the torque generation in self-sensing BLDC drives by shaping the current waveform

Manzolini

Darba

Belie

2016

2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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Abstract-Brushless DC drives are widely used in different fields of application because of their high efficiency and power density. Torque ripple can be considered one of the drawbacks of these drives. This paper proposes a method to reduce the torque ripple in BLDC drives. For this reason, the current amplitude is adapted to the rotor position rather than to be kept constant as done in a conventional commutation method. This is done by computing an optimum reference current based on the phase back-EMF waveform. The proposed approach is implemented in a self-sensing drive so its applicability to self-sensing BLDC motor drives is verified. Simulation and experimental results are given and discussed to show that the proposed method actually is able to improve torque production.

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“…The model developed from the R&D of this paper was also fabricated in the same way. BLDC motors have gained popularity due to their high efficiency, compact form, reliability, and low maintenance [6,7]. As a result of a no-load test performed to verify the designed motor, it was found that non-ideally excessive input power was supplied.…”

Section: Introductionmentioning

confidence: 99%

High-Speed BLDC Motor Design for Suction Fan and Impact on the Loss caused by Core Welding

Hong¹,

Kim²,

Hojoon³

et al. 2017

Journal of Electrical Engineering and Technology

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-This paper deals with the effects of welding, which is done to fix the stator stack, on a motor in case of fabricating a prototype motor that is manufactured in a small quantity. In the case of a small motor, the stator is designed and fabricated with the segmented core as a way to raise the fill factor of winding wire to the utmost within a limited size. In case of fabrication by welding both inside and outside of the stator in order to fix the segmented-core stator, the effects of stack are ignored, and the eddy current loss occurs. This paper performed the no-load test on an IPM-type BLDC motor for driving the suction fan of a vacuum cleaner, which was manufactured by using a segmented-core stator. As a result of the test, it was found that input power more than expected was supplied. To analyze the effects of welding by using the finite element analysis method and verify them experimentally, a stator was re-manufactured by bonding, and input power supplied during the no-load test was compared.

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Sensorless commutation and speed control of Brushless DC-machine drives based on the back-EMF symmetric threshold-tracking

Cited by 15 publications

References 12 publications

FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for Brushless DC-machines

FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for Brushless DC-machines

Improving the torque generation in self-sensing BLDC drives by shaping the current waveform

High-Speed BLDC Motor Design for Suction Fan and Impact on the Loss caused by Core Welding

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