Position and Speed Estimation of Permanent Magnet Machine Sensorless Drive at High Speed Using an Improved Phase-Locked Loop

Chen, Guan-Ren; Yang, Shih-Chin; Hsu, Yu-Liang; Li, Kang

doi:10.3390/en10101571

Cited by 17 publications

(14 citation statements)

References 38 publications

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“…Electronics 2019, 8, x FOR PEER REVIEW 2 of 13 position [7][8][9][10][11]. In the sensorless control method, the stator current is measured to estimate the speed of the motor.…”

Section: Control Unit For Pmsmmentioning

confidence: 99%

“…In conventional position sensorless permanent magnet (PM) machine drives, the rotor position is obtained from the phase-locked loop (PLL) with the regulation of spatial signal in estimated back electromotive force (EMF) voltages. Due to the sinusoidal distribution of back-EMF voltages, a small-signal approximation is assumed in the PLL in order to estimate the position [7][8][9][10][11]. In the sensorless control method, the stator current is measured to estimate the speed of the motor.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the PMSM Shaft Position with An Absolute Encoder

Rudnicki

2019

Electronics

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The most critical aspect of assessing a permanent magnet synchronous motor is the problem of correctly measuring the position of the synchronous motor shaft. The purpose of this article was to show the effects of employing an absolute encoder to control a synchronous motor with permanent magnets while encountering disturbances. This problem is often overlooked, but it appears from time to time. The correct measurement of the shaft position eliminates improper motor operation characterized by jerking. The article showed that despite momentary erroneous readings of the shaft’s position, it was still possible to control the permanent magnet synchronous motor (PMSM). This also allows for correct measurement of the motor speed. This paper originally proposed an adaptive correction method for a rotary encoder.

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“…Electronics 2019, 8, x FOR PEER REVIEW 2 of 13 position [7][8][9][10][11]. In the sensorless control method, the stator current is measured to estimate the speed of the motor.…”

Section: Control Unit For Pmsmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of the PMSM Shaft Position with An Absolute Encoder

Rudnicki

2019

Electronics

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“…Most approaches are based on the estimation of the PMSM variables such as the back electromotive force, in the stationary reference frame αβ. In a typical sensorless control scheme, the rotor speed and position are obtained from estimated PMSM parameters or variables, such as back-EMF or rotor flux, implementing state estimators such as a Luenberger, sliding mode or phase-locked-loop (PLL)-type observer [4,17]. Several developed observers were based on PMSM current model, which may cause instability issues in some speed ranges due to introduced model assumptions [4,17].…”

Section: Introductionmentioning

confidence: 99%

“…In a typical sensorless control scheme, the rotor speed and position are obtained from estimated PMSM parameters or variables, such as back-EMF or rotor flux, implementing state estimators such as a Luenberger, sliding mode or phase-locked-loop (PLL)-type observer [4,17]. Several developed observers were based on PMSM current model, which may cause instability issues in some speed ranges due to introduced model assumptions [4,17]. In avoiding such model simplifications, the magnetic saliency and the back-EMF terms are included into the so-called extended EMF [1,18,19].…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of Permanent Magnet Synchronous Machine with Magnetic Saliency Tracking Based on Voltage Signal Injection

Ilioudis

2020

Machines

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This paper presents a sensorless control method of a permanent magnet synchronous machine (PMSM) with magnetic saliency estimation. This is based on a high-frequency injection (HFI) technique applied on the modified PMSM model in the γδ reference frame. Except for sensorless control, an emphasis is placed on the magnetic saliency estimation to indicate a practical approach in tracking PMSM inductance variations. The magnetic saliency is determined using calculations embedded in the speed and position algorithm through current measurements. A notable characteristic of the modified PMSM model is that the corresponding rotor flux integrates both permanent magnet and saliency term fluxes. In applying a HFI technique for sensorless control, the structure of the PMSM flux model is formatted accordingly. A novel inductance matrix is derived that is completely compatible with the HFI methodology, since its elements include terms of angle error differential and average inductances. In addition, a sliding mode observer (SMO) is designed to estimate the speed and angle of rotor flux based on equivalent control applying a smooth function of the angle error instead of a sign one to reduce the chattering phenomenon. The control strategy is principally based on the adequacy of the proposed modified model and on the appropriateness of the SMO structure to successfully track the rotor flux position with the required stability and accuracy. Simulation results demonstrate the performance of the PMSM sensorless control verifying the effectiveness of the proposed algorithm to detect PMSM saliency, speed and position in steady state and transient modes successfully. Keywords: sensorless control of PMSM; sliding mode observer (SMO); magnetic saliency estimation; modified rotor flux; high frequency injection (HFI) Notation u d , u q = dq axis stator voltages i d , i q = dq axis stator currents λ d , λ q = dq axis stator magnetic fluxes λ m = rotor magnetic flux L d , L q = dq axis inductances ΣL =(L d +L q )/2 = average inductance ∆L = (L d -L q )/2 = differential inductance r s = stator resistance u γ , u δ = γδ axis stator voltages i γ , i δ = γδ axis stator currents λ γ , λ δ = γδ axis stator magnetic fluxes p = number of pole pairs θ = θ e = electrical angular position ω = ω e = electrical angular speed Machines 2020, 8, 14 3 of 20However, the observers in the αβ stationary reference frame suffer from phase delay between the real and the estimated EMF, since the real extended EMF is a sinusoidal signal [18,20]. This undesired phase delay is due to the observer operation, which is similar to signal filtering. Despite the αβ stationary frame, PMSM variables, such as flux and extended EMF, are constant quantities in the dq (direct-quadrature) synchronous rotating reference frame that, however, cannot be applied directly. An advantageous alternative proposal is to express PMSM mathematical model in the γδ reference frame, which is rotating at estimated angular velocityω and lagging behind the dq synchronous reference frame by electrical...

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“…Generally, PM machines have high efficiency and large torque density when employed with a rare earth magnet, which makes them more competitive than electrically excited machines (EEMs) in large-torque traction applications [1][2][3][4][5][6][7]. Fixed PM excitation is one major drawback of PM machines which means that the air-gap flux cannot be easily regulated as in the EEMs by controlling the excitation current.…”

Section: Introductionmentioning

confidence: 99%

A Novel DC-Coil-Free Hybrid-Excited Machine with Consequent-Pole PM Rotor

Wang

Niu

2018

Energies

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This paper proposes a new DC coil free hybrid excited machine concept, which has no external field windings. The technical novelty is the integration of field windings and armature windings. DC bias current is injected into the excitation and the field windings in the traditional hybrid excited machine are eliminated. Compared with traditional hybrid-excited machines with additional field windings, the proposed machine can realize a higher slot utilization ratio, hence achieve a higher torque density and a wider flux adjusting range. Another advantage of the proposed machine is that the voltage drop associated with flux regulation is small due to the small DC resistance, and the torque generating capability at the flux regulating region can be improved accordingly. The rotor is specifically designed with magnet-iron sequences and a consequent-pole, in which the permanent magnet and iron pole are alternatively employed. A bi-directional flux modulating effect can be achieved, which can contribute to the magnetic coupling in the air-gap. Analytical derivation is used to describe the operating principle, and the proposed machine was optimally designed using the Tabu search algorithm. A prototype was made, and its performances investigated through experimental tests.

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Position and Speed Estimation of Permanent Magnet Machine Sensorless Drive at High Speed Using an Improved Phase-Locked Loop

Cited by 17 publications

References 38 publications

Measurement of the PMSM Shaft Position with An Absolute Encoder

Measurement of the PMSM Shaft Position with An Absolute Encoder

Sensorless Control of Permanent Magnet Synchronous Machine with Magnetic Saliency Tracking Based on Voltage Signal Injection

A Novel DC-Coil-Free Hybrid-Excited Machine with Consequent-Pole PM Rotor

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