Rotor position estimation scheme with harmonic ripple attenuation for sensorless controlled permanent magnet synchronous motors

Lu, Qing; Zhu, Xiaoyong; Quan, Li; Zuo, Yuefei; Sichen, Du

doi:10.1049/iet-epa.2017.0858

Cited by 18 publications

(10 citation statements)

References 30 publications

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“…where ω c is the desired bandwidth of PLL. As analysed in [20] and described in (6), θ d is the function of the inductance ratio (L q /L d ) and rotor speed multiplied by the ZVV duration (ω e t p ). With a small inductance ratio and ω e t p , θ d approaches π/2 rad.…”

Section: Estimation Of Rotor Position and Speedmentioning

confidence: 99%

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Restart strategy for sensorless PMSM drive system based on zero‐voltage vector

Bao

Shen

et al. 2020

IET Electric Power Applications

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The zero‐voltage vector (ZVV) method is widely employed to restart a free‐running permanent magnet synchronous machine (PMSM) stably in a sensorless drive system due to its simple implementation. However, in the conventional method, it is hard to determine the action time and interval time of ZVV pulses, which may result in overcurrent. Moreover, the estimation accuracy is susceptible to current measurement noise. To cope with these problems, an enhanced ZVV method based on two feedback loops is proposed. With the proposed strategy, an inner closed loop is constructed to regulate the action time of the ZVV pulse by keeping the current amplitude at the reference value, which prevents the overcurrent. Meanwhile, the reference value of the current amplitude is adjusted automatically based on the outer loop to determine a suitable interval time of the ZVV pulse. Furthermore, the phase‐locked loop technique is exploited to extract rotor speed and position. The feasibility of the proposed method is verified under simulation and experimental results with a 5.5 kW sensorless PMSM drive system.

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Section: Estimation Of Rotor Position and Speedmentioning

confidence: 99%

“…In order to increase reliability and reduce cost, various advanced sensorless control structures have been proposed to remove the encoder in the drive system [1][2][3]. In general, the rotor position is obtained based on current measurements in these schemes [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Restart strategy for sensorless PMSM drive system based on zero‐voltage vector

Bao

Shen

et al. 2020

IET Electric Power Applications

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show abstract

“…is satisfied can guarantee the stability of the SMSC, where ρ max is the maximum disturbance estimation error. It can be seen from (22) and (26) that ε 2 is much smaller than ε 2 and therefore, it can dramatically reduce the chattering without increasing convergence time. Since the disturbance can provide a feed-forward to the SMSC to enhance its response speed and reduce the chattering, a disturbance observer with fast observation speed is designed as follows.…”

Section: Design Of Smscmentioning

confidence: 99%

“…The proposed method can effectively extract the fundamental of the back EMF from the SMO without introducing any phase lag at the centre frequency [21]. Similar to the SFE, Lu et al [22] proposed an improved SMO adopting synchronous rotating low-pass filter. However, both algorithms are computationally intensive and sensitive to speed variations.…”

Section: Introductionmentioning

confidence: 99%

High‐performance control method for the MSTMP motor

Hai-feng

Liu

2020

IET Power Electronics

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Permanent magnet synchronous motor (PMSM) is the ideal drive for the magnetically suspended turbo-molecular pump (MSTMP) for its high power density, reliable operation and high energy efficiency. Rotor position information is necessary to drive the PMSM. However, because of the installation space limitation and reliability requirement, position sensorless control technology without mechanical position sensors is more attractive. In this study, a sliding mode observer is adopted to estimate the back electromotive force (EMF) that contains the position information. Since the high-order harmonics in the back EMF would lead to harmonic position errors, a fixed frequency extraction filter is proposed to filter out the harmonics. A high precision speed control is of importance to ensure the performance of the MSTMP and also contributes to achieving a better position estimation accuracy, especially under strong disturbances. Therefore, a composite speed controller combining a sliding mode speed controller and a sliding mode disturbance observer is proposed to improve the speed control performance of the MSTMP. The effectiveness of the proposed high-performance control method for the MSTMP motor is evaluated with experiments.

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“…a) LPF delay The conventional SMO uses the signum function as the switching function [22]- [24], leading to inevitable chattering phenomenon when the system states go through the sliding surface (SS) from one side to the other. In order to attenuate the adverse effect of chattering on the accuracy of position calculation, the LPFs with fixed or variable cut-off frequency are commonly adopted [23], [24]. However the inherent delay attribute of the LPFs would bring about errors between the real and estimated values.…”

mentioning

confidence: 99%

An Improved Delay-Suppressed Sliding-Mode Observer for Sensorless Vector-Controlled PMSM

Gong

Gao

et al. 2020

IEEE Trans. Ind. Electron.

286

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This paper presents a delay-suppressed sliding mode observer (SMO) to observe the real-time rotor position of a permanent magnet synchronous machine (PMSM) controlled by vector control (VC) algorithms. Firstly, in order to solve the low pass filter (LPF) delay problem existing in the traditional signum function-based sliding mode observer (SMO), a brand-new hyperbolic function is initially selected as the switching function. Because a hyperbolic function with proper boundary layer is capable of reducing the chattering phenomenon of a SMO, it is not necessary to re-employ LPFs to eliminate the adverse impacts of chattering on the position estimation accuracy. In order to ensure the reachability and stability of the hyperbolic function-based SMO, the observer gain is calculated by the means of a Lyapunov function in this paper. Secondly, to solve the problem of calculation delay caused by digital computation, a current pre-compensation scheme based on dual-sampling strategy in one switching period is proposed. After compensating the calculation delay, the accuracy of position estimation as well as the motor control performance can be improved. Finally, the proposed SMOs with and without delay compensation are verified by both simulation and experiments which are conducted on a three-phase 1.5kW PMSM drive prototype.

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Rotor position estimation scheme with harmonic ripple attenuation for sensorless controlled permanent magnet synchronous motors

Cited by 18 publications

References 30 publications

Restart strategy for sensorless PMSM drive system based on zero‐voltage vector

Restart strategy for sensorless PMSM drive system based on zero‐voltage vector

High‐performance control method for the MSTMP motor

An Improved Delay-Suppressed Sliding-Mode Observer for Sensorless Vector-Controlled PMSM

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