The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
Kun Wang - One of the best experts on this subject based on the ideXlab platform.
-
Adaptive Commutation Error Compensation Strategy Based on a Flux Linkage Function for Sensorless Brushless DC Motor Drives in a Wide Speed Range
IEEE Transactions on Power Electronics, 2018Co-Authors: Shaohua Chen, Xiangyu Zhou, Kun WangAbstract:This paper presents a novel adaptive commutation error Compensation strategy for the sensorless brushless DC (BLDC) motor based on the flux linkage function. It addresses the two key challenge problems on the sensorless control of the BLDC motor. The one is presenting a novel detection method for the BLDC motor rotor position signal to filter out the interference and the noise by the high frequency. The other one is proposing a commutation error Compensation strategy to improve the system efficiency. In traditional sensorless control strategy, a deep low-pass filter is usually used to obtain the BLDC motor rotor position signal from the high-frequency interference. However, the delayed angle caused by the low-pass filter may be more than 90 electrical degrees in the high speed range. Therefore, a novel sensorless control strategy based on the speed-independent flux linkage function was proposed in this paper. The interference of the diode freewheeling was filtered by the software filter, and a closed-Loop Compensation algorithm based on the deviation of line-to-line voltages was illustrated to correct the commutation error in the high speed range. The stability and accuracy of the method was confirmed by a series of experiments.
-
sensorless control for high speed brushless dc motor based on the line to line back emf
IEEE Transactions on Power Electronics, 2016Co-Authors: Gang Liu, Kun Wang, Chenjun Cui, Bangcheng Han, Shiqiang ZhengAbstract:A sensorless control method for a high-speed brushless DC motor based on the line-to-line back electromotive force (back EMF) is proposed in this paper. In order to obtain the commutation signals, the line-to-line voltages are obtained by the low-pass filters. However, due to the low-pass filters, wide speed range, and other factors, the actual commutation signals are significantly delayed by more than 90 electrical degrees which limits the acceleration of the motor. A novel sensorless commutation algorithm based on the hysteresis transition between “90-α” and “150-α” is introduced to handle the severe commutation retarding and guarantee the motor works in a large speed range. In order to compensate the remaining existing commutation errors, a novel closed-Loop Compensation algorithm based on the integration of the virtual neutral voltage is proposed. The integration difference between the adjacent 60 electrical degrees interval before and after the commutation point is utilized as the feedback of the PI regulator to compensate the errors automatically. Several experiment results confirm the feasibility and effectiveness of the proposed method.
M F Rahman - One of the best experts on this subject based on the ideXlab platform.
-
sensorless direct torque and flux controlled ipm synchronous machine fed by matrix converter over a wide speed range
IEEE Transactions on Industrial Informatics, 2013Co-Authors: Dan Xiao, M F RahmanAbstract:This paper proposes a new sensorless direct torque and flux controlled interior permanent magnet synchronous machine drive fed by a matrix converter. Closed-Loop control of both torque and stator flux is achieved by using two PI controllers. The input and output voltage vectors are modulated with the indirect space vector modulation technique. Additionally, unity power factor on the power supply side of matrix converter is achieved through closed-Loop Compensation of the input displacement angle created by the input filter of matrix converter. The adaptive observer used for joint stator flux and rotor speed estimation is enhanced by HF signal injection scheme for stable operation at low speed including standstill. The stator resistance variation is compensated with the current estimation error. The operating range of the drive is extended into high speed region by incorporating field weakening. The sensorless drive exhibits high dynamic and steady-state performances over a wide speed range. The implementation of digital control system for the proposed matrix converter drive is described in this paper. Extensive experimental results confirming the effectiveness of the proposed method are also included.
Shiqiang Zheng - One of the best experts on this subject based on the ideXlab platform.
-
sensorless control for high speed brushless dc motor based on the line to line back emf
IEEE Transactions on Power Electronics, 2016Co-Authors: Gang Liu, Kun Wang, Chenjun Cui, Bangcheng Han, Shiqiang ZhengAbstract:A sensorless control method for a high-speed brushless DC motor based on the line-to-line back electromotive force (back EMF) is proposed in this paper. In order to obtain the commutation signals, the line-to-line voltages are obtained by the low-pass filters. However, due to the low-pass filters, wide speed range, and other factors, the actual commutation signals are significantly delayed by more than 90 electrical degrees which limits the acceleration of the motor. A novel sensorless commutation algorithm based on the hysteresis transition between “90-α” and “150-α” is introduced to handle the severe commutation retarding and guarantee the motor works in a large speed range. In order to compensate the remaining existing commutation errors, a novel closed-Loop Compensation algorithm based on the integration of the virtual neutral voltage is proposed. The integration difference between the adjacent 60 electrical degrees interval before and after the commutation point is utilized as the feedback of the PI regulator to compensate the errors automatically. Several experiment results confirm the feasibility and effectiveness of the proposed method.
-
suppression of imbalance vibration for ambs controlled driveline system using double Loop structure
Journal of Sound and Vibration, 2015Co-Authors: Qi Chen, Shiqiang ZhengAbstract:Abstract Because of the couplings without off-line balancing and the uneven distribution of the rope, the equivalent residual unbalances in the active magnetic bearing (AMB) controlled driveline system are considerable. Therefore it is necessary to achieve suppressing the synchronous vibration force over the entire operating speed range. To completely achieve automatic balance of the rotor, a double-Loop Compensation design approach based on the AMB is proposed. Firstly, a dynamic model of the rotor with imbalance and the decentralized control system of magnetic bearing are established. Then the imbalance characteristic of the rotor system is identified by the generalized notch in which sign of the convergence coefficient needs to be changed according to the rotational speed. Finally, the second Loop which is a simply feedforward Loop at low speeds and switched to an adaptively tuning Loop at high speeds is used to adjust the control current to achieve complete suppression of the imbalance vibration force. The method can achieve automatic balancing within the entire operating speed range and the effectiveness is unaffected by the attenuation of power amplifier at high speeds. Simulation and experiment results well demonstrate effectiveness of the approach, and the stability of the whole system is guaranteed.
Fathi H. Ghorbel - One of the best experts on this subject based on the ideXlab platform.
-
Closed-Loop Compensation of kinematic error in harmonic drives for precision control applications
IEEE Transactions on Control Systems Technology, 2002Co-Authors: Prasanna S. Gandhi, Fathi H. GhorbelAbstract:We present nonlinear control algorithms to compensate for kinematic error in harmonic drives, thus forming a solid basis to improve their performance in precision positioning applications. Kinematic error, defined as deviation between expected and actual output positions, influences performance by producing static positioning error and inducing dynamic vibration effects. Its Compensation is difficult because of its nonlinear behavior and dependence on drive type, assembly, environmental conditions, and drive load. The Lyapunov-based closed-Loop control algorithms presented in this paper compensate for the kinematic error irrespective of its form in setpoint and trajectory tracking applications. Simulation and experimental results obtained with a dedicated harmonic drive test setup verify the effectiveness of the proposed controllers.
-
Closed Loop Compensation of kinematic error in harmonic drives for precision control applications
Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), 1Co-Authors: Prasanna S. Gandhi, Fathi H. GhorbelAbstract:Harmonic drives are widely used in precision positioning applications because of their unique advantages including near zero backlash, high gear reduction and small weight. However, precision positioning is made difficult by inherent error that exists between input and output, known as kinematic error. The latter is difficult to compensate for because of its nonlinear periodic behavior and dependence on drive type, assembly, and environmental conditions. We present nonlinear PD-type control algorithms to compensate for the kinematic error independent of its form. Dynamic simulation and experimental regulation and tracking results obtained with a dedicated harmonic drive test setup demonstrate the effectiveness of our proposed control strategies.
Marco Storace - One of the best experts on this subject based on the ideXlab platform.
-
a toolchain for open Loop Compensation of hysteresis and creep in atomic force microscopes
International Symposium on Circuits and Systems, 2019Co-Authors: Alberto Oliveri, Roberto Raiteri, Matteo Lodi, Marco StoraceAbstract:Any Atomic Force Microscope (AFM) scanner based on piezoelectric ceramics is affected by nonlinear distortions, mainly due to rate-independent hysteresis and rate-dependent creep, two different phenomena often referred to, collectively, as rate-dependent hysteresis. To compensate for these distortions, especially in old or cheap instruments, empirical open-Loop Compensation techniques are frequently adopted. In this paper, a complete hardware/software toolchain is proposed, for data acquisition, identification of hysteresis and creep models, and real-time open-Loop Compensation of rate-dependent hysteresis in AFM scanners.
-
open Loop Compensation of hysteresis and creep through a power law circuit model
IEEE Transactions on Circuits and Systems, 2016Co-Authors: Alberto Oliveri, Flavio Stellino, Guido Caluori, Mauro Parodi, Marco StoraceAbstract:The inverse of a recently proposed hysteresis and creep circuit model is proposed and discussed. The model is particularly suitable for piezoelectric actuators and its inverse can be used for open-Loop Compensation of the undesired nonlinearities in high-precision applications. The inverse model is defined, analyzed in terms of conditions ensuring a correct Compensation, and discretized to provide a digital Compensation algorithm suitable for implementation in low-cost programmable devices. Quantitative results on experimental data are provided and discussed, including the Compensation on an atomic force microscope.
