Performance Comparison of Different Estimation Techniques of the External Load-torque applied on a PMSM using Direct Flux Control

Fabbri, Stefano; D’Amato, Davide; Palmieri, Marco; Cupertino, Francesco; Nienhaus, Matthias; Grasso, Emanuele

doi:10.1109/speedam48782.2020.9161858

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…Although this state observer is easy to implement, it very often has a very high computational cost, especially when implemented in very non-linear systems. Moreover, relying on the linearization of the state variables, it has a first-order accuracy that can lead to filter instability [67]. Jensen et al designed the state observer with a low sampling rate, finding a trade-off between the estimation accuracy and the computational cost of the technique.…”

Section: Macroscopic Effectsmentioning

confidence: 99%

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

et al. 2022

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The insulation system’s dielectric of the electric motor is very often subjected to severe electrical stress generated by the high dv/dt seen at the machine’s terminals. The electrical stress and high reflected wave transient overvoltage are even more evident in case of high-speed machines fed by high-frequency (HF) converters featuring very fast wide-bandgap devices. They are promoting the occurrence of partial discharges and consequently accelerate ageing. As this is serious issue and the main cause of the drive failure, it is important to analyse and characterise the surges at the motor terminals. Several HF models of motors have been proposed in the literature for this purpose. This article presents a survey on HF motor models, which is crucial in understanding and studying the most critical parameter identification and overvoltage mitigation techniques. Moreover, it offers a comparison of the models’ main features as well as a comparison with the experimental voltage waveform at motor terminals. A general overview of the partial discharge (PD) phenomenon is also provided, as it is favoured by HF operation and together with HF motor modelling provides key insights to the insulation ageing issue. In particular, an analysis of the effects of PWM waveform affecting insulation is given, as well as useful methods for developing strategies for the inspection and maintenance of winding insulation.

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Section: Macroscopic Effectsmentioning

confidence: 99%

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

et al. 2022

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“…No assumptions on the behaviour of the applied load torque can be made, since this torque is an external unknown disturbance. Therefore, the only valid assumption is to consider the unknown disturbance applied to the motor to be invariable in a short time interval [32,35]. Considering the mechanical rotor position as the only measurable quantity, ( 13)-( 15) can be written using a continuous-time state-variables representation:…”

Section: Motor Load Torque Observationmentioning

confidence: 99%

“…Also, in [34], a comparison between sensored and sensorless load torque estimation based on UKFs is reported. Moreover, in [35], several state observers which rely on the position information given by the DFC sensorless technique have been successfully implemented and compared. Also in this work, a LTO which exploits the DFC sensorless technique is proposed showing the robustness of the pedalling torque estimation to errors on the measured mechanical quantities.…”

Section: Introductionmentioning

confidence: 99%

Sensorless Pedalling Torque Estimation Based on Motor Load Torque Observation for Electrically Assisted Bicycles

et al. 2021

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The need for reducing the cost of and space in Electrically Assisted Bicycles (EABs) has led the research to the development of solutions able to sense the applied pedalling torque and to provide a suitable electrical assistance avoiding the installation of torque sensors. Among these approaches, this paper proposes a novel method for the estimation of the pedalling torque starting from an estimation of the motor load torque given by a Load Torque Observer (LTO) and evaluating the environmental disturbances that act on the vehicle longitudinal dynamics. Moreover, this work shows the robustness of this approach to rotor position estimation errors introduced when sensorless techniques are used to control the motor. Therefore, this method allows removing also position sensors leading to an additional cost and space reduction. After a mathematical description of the vehicle longitudinal dynamics, this work proposes a state observer capable of estimating the applied pedalling torque. The theory is validated by means of experimental results performed on a bicycle under different conditions and exploiting the Direct Flux Control (DFC) sensorless technique to obtain the rotor position information. Afterwards, the identification of the system parameters together with the tuning of the control system and of the LTO required for the validation of the proposed theory are thoroughly described. Finally, the capabilities of the state observer of estimating an applied pedalling torque and of recognizing the application of external disturbance torques to the motor is verified.

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“…To overcome this limitation in [30], the technique has been combined with BEMF information in order to extend the speed range also to high speed using an extended Kalman filter (EKF). Moreover, the DFC technique has been successfully used in several practical applications such as the identification of electrical and mechanical parameters of PMSMs [31] and the observation of the external load torque using state observation techniques in [32]. Besides this technique, another interesting approach was proposed by [33] that goes under the name of IVMS (induced voltage caused by magnetic saturation), that is capable of estimating the electrical rotor position by exciting two machine phases at a time and measuring the neutral point voltage.…”

Section: Introductionmentioning

confidence: 99%

Influence and compensation of the stator flux on the direct flux control sensorless technique for PMSMs

Grasso

Palmieri

Mandriota

et al. 2021

J. eng.

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Several techniques exploiting machines anisotropies have been proposed in literature for sensorless control of synchronous machines. Among them, the direct flux control (DFC) technique allows estimating the electrical rotor position by exploiting the zero-sequence voltage of the machine. This work aims at analysing the effects of magnetic saturation on the application of the DFC technique to permanent magnet synchronous machines. This effect is present when stator flux is controlled during machine operation, leading to an error in the estimation of the electrical rotor position. Starting from an analytical model of the machine phase inductances, a complete mathematical description of the DFC technique is derived and presented. The proposed mathematical model shows how the estimated electrical rotor position is biased when operating under load conditions. Moreover, the result of the analysis of the DFC technique allows to refine the obtained estimate and to reduce the electrical rotor estimation error. Experimental results on a test motor are provided in order to verify and support the proposed mathematical model and technique.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Performance Comparison of Different Estimation Techniques of the External Load-torque applied on a PMSM using Direct Flux Control

Cited by 3 publications

References 10 publications

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

Impact of PWM Voltage Waveforms in High-Speed Drives: A Survey on High-Frequency Motor Models and Partial Discharge Phenomenon

Sensorless Pedalling Torque Estimation Based on Motor Load Torque Observation for Electrically Assisted Bicycles

Influence and compensation of the stator flux on the direct flux control sensorless technique for PMSMs

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