EPE Association: EPE 2025 - DS3i: Control of Electric Drives

EPE 2025 - DS3i: Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 12: Electrical Machines and Drive Systems > EPE 2025 - DS3i: Control of Electric Drives

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   Adaptive Bias Current Control of an Active Magnetic Bearing Under Motion-Induced Eddy Currents
By Timon DEWITTE, Ruben DE CROO, Frederik DE BELIE [View]
[Download]

Abstract: This paper investigates the impact of motion-induced eddy currents on the dynamic performance of active magnetic bearings (AMBs) with a solid rotor. Since these eddy currents weaken the magnetic field in the air gap, the force exerted on the rotor is reduced which affects the dynamic behaviour of the AMB. An analytical model of the change in magnetic field distribution is presented and compared with simulation results using the finite element method for different rotor speeds.An adaptive control approach comprising a parameter estimation algorithm and a PI controller is implemented to mitigate these effects. This is based on an augmented Kalman filter which estimates the bias current corresponding to the weakened magnetic field. Based on this estimate, the actual bias current is adapted in order to counteract the reduction in magnetic field. Experimental results of the adaptive algorithm are presented and compared to simulation results.

   Harmonic Current Injection Method for Torque Ripple Suppression over Wide Speed Range Considering Magnetic Saturation in PMSMs
By Kodai TAKEDA, Shun TANIGUCHI, Takafumi HARA, Kentaro MATSUO [View]
[Download]

Abstract: We propose a flux-based harmonic current injection method that accounts for magnetic saturation to suppress torque ripple in permanent magnet synchronous motors feedforwardly. The key feature of the proposed method is converting a harmonic-current command into a flux command by pre-acquired nonlinear flux information and converting the flux command into voltage commands through an approximate equation. Numerical simulations demonstrate that this method reduces 12th-order torque ripple by over 70\\% within a wide frequency range. Experimental results indicate that the amplitude and phase errors of the injected harmonic flux can be held to as low as 0.2\\% and 2.9°, respectively, even without additional feedback control for harmonics.

   Modelling and Post-Fault Current Control Strategy for Multi-Three-Phase Machines
By Azlia ABDUL RAHMAN, Meiqi WANG, Lorenzo CARBONE, Gioele BAIA, Michele DEGANO [View]
[Download]

Abstract: The growing development of Multi-Three-Phase Machines (MTPM) as competitive to conventional three-phase machines has attracted more attention to the higher reliability and fault-tolerant capability of the electrical drives system especially for safety-critical applications. In this paper, modelling technique and post-fault current control strategy for dual three-phase Interior Permanent Magnet (IPM) synchronous machines are presented, utilizing the Vector Space Decomposition (VSD) algorithm. As the multi-stator (MS) or dq modelling is an ideal option for post-fault strategies, the comparative study between VSD and MS methods are demonstrated in order to analyse their dynamic performance in nominal and faulty conditions. This take into account the equivalent harmonic inductance variation, which is then used to introduce the postfault control strategy. A double three-phase IPM machine is modelled and operated in two different operating conditions: nominal and one three-phase set of windings in open-circuit (OC). In OC fault, the proportional and integral (PI) controllers are re-designed while adapting the inductance variation. The current dynamics responses are analysed in both healthy and faulty conditions by means of Matlab/Simulink ® simulations.

   MRAS-based sensorless field oriented controlled axial flux permanent magnet synchronous machine with additional parameter adaptation
By Michael BRÜNS, Christian RUDOLPH [View]
[Download]

Abstract: The characteristics of a sensorless control method for synchronous machines with a parallel model are investigated, in consideration of additional online parameter adaptation. Using error compensated reference voltage inputs the parallel model's parameters are adapted to the synchronous machine by comparing the model current output with the measured current values. Thus the adaptation to the reference transfer behavior of the system is accomplished using an implicit method. After describing the difference between the reference and the adaptive model mathematically, the system stability is analysed using Popov's hyperstability condition. An additional stability criterion could be derived from the full machine model. The extension of the sensorless control was achieved through a simultaneous adaptation algorithm accounting for coupling effects caused by the influence of misalignment of the field-coordinates.

   Online Inductance Identification of Permanent Magnet Synchronous Motor Based on Extended Kalman Filter With Dead-Time Compensation
By Kai YANG, Guoyi QIU, Cheng LUO [View]
[Download]

Abstract: A dq-axis inductance identification method is proposed for permanent magnet synchronous motor (PMSM) , which is based on an extended Kalman filter with dead-time compensation. The proposed method is intended to estimate the disturbance voltage in the dq coordinate system, which is caused by dead-time and non-ideal switching characteristics of the power devices. The proposed method is achieved by means of parametric calculation, which is then fed into the Kalman filter to compensate the dead-time effect. Furthermore, the sensitivity analyses of the input parameters demonstrate that the accuracy of the extended Kalman filter discrimination is contingent on the precision of the input parameters. The effectiveness of the proposed method is demonstrated by simulation results.

   Performance analysis of PMSM servo-drive with state feedback and hybrid position controllers
By Tomasz TARCZEWSKI, Hubert LISINSKI, Lech GRZESIAK [View]
[Download]

Abstract: High-performance operation of servo-drivewith permanent magnet synchronous motor (PMSM) is requiredin many industrial applications, including robotics,machines, and, recently, aircraft components. Complexcontrol structures are necessary to meet the specific requirementsof these applications. In this paper, two controlstructures developed for position control of PMSM servodriveare presented. The state feedback control (SFC)structure augmented by state variables' limitation andload torque compensation is presented and comparedwith a hybrid control structure (HSC) where the innercurrent control loop exists. An experimental evaluationof both control schemes regarding dynamic properties,disturbance compensation, and robustness against themoment of inertia changes is included.

   Sensorless Position Control of Synchronous Reluctance Motor with Real Time Path Generation
By Federico CENTI, Andrea CREDO, Giuseppe FABRI, Rama SALLOUM, Marco TURSINI [View]
[Download]

Abstract: This paper presents a sensorless position controlfor synchronous reluctance motors with real-timepath generation. Sensorless control employs highfrequency flux injection with digitaldemodulation by sampling. The path generationis embedded in the drive microcontroller makingavailable the use of fast feedforward actions bothin the control loops and in the sensorless engine.The experimental results show the feasibility ofthe approach although the intrinsic positionestimation error of the high-frequency injectionlimits the speed range.

EPE 2025 - DS3i: Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 12: Electrical Machines and Drive Systems > EPE 2025 - DS3i: Control of Electric Drives
	[return to parent folder]

	Adaptive Bias Current Control of an Active Magnetic Bearing Under Motion-Induced Eddy Currents By Timon DEWITTE, Ruben DE CROO, Frederik DE BELIE	[View] [Download]
Abstract: This paper investigates the impact of motion-induced eddy currents on the dynamic performance of active magnetic bearings (AMBs) with a solid rotor. Since these eddy currents weaken the magnetic field in the air gap, the force exerted on the rotor is reduced which affects the dynamic behaviour of the AMB. An analytical model of the change in magnetic field distribution is presented and compared with simulation results using the finite element method for different rotor speeds.An adaptive control approach comprising a parameter estimation algorithm and a PI controller is implemented to mitigate these effects. This is based on an augmented Kalman filter which estimates the bias current corresponding to the weakened magnetic field. Based on this estimate, the actual bias current is adapted in order to counteract the reduction in magnetic field. Experimental results of the adaptive algorithm are presented and compared to simulation results.

	Harmonic Current Injection Method for Torque Ripple Suppression over Wide Speed Range Considering Magnetic Saturation in PMSMs By Kodai TAKEDA, Shun TANIGUCHI, Takafumi HARA, Kentaro MATSUO	[View] [Download]
Abstract: We propose a flux-based harmonic current injection method that accounts for magnetic saturation to suppress torque ripple in permanent magnet synchronous motors feedforwardly. The key feature of the proposed method is converting a harmonic-current command into a flux command by pre-acquired nonlinear flux information and converting the flux command into voltage commands through an approximate equation. Numerical simulations demonstrate that this method reduces 12th-order torque ripple by over 70\\% within a wide frequency range. Experimental results indicate that the amplitude and phase errors of the injected harmonic flux can be held to as low as 0.2\\% and 2.9°, respectively, even without additional feedback control for harmonics.

	Modelling and Post-Fault Current Control Strategy for Multi-Three-Phase Machines By Azlia ABDUL RAHMAN, Meiqi WANG, Lorenzo CARBONE, Gioele BAIA, Michele DEGANO	[View] [Download]
Abstract: The growing development of Multi-Three-Phase Machines (MTPM) as competitive to conventional three-phase machines has attracted more attention to the higher reliability and fault-tolerant capability of the electrical drives system especially for safety-critical applications. In this paper, modelling technique and post-fault current control strategy for dual three-phase Interior Permanent Magnet (IPM) synchronous machines are presented, utilizing the Vector Space Decomposition (VSD) algorithm. As the multi-stator (MS) or dq modelling is an ideal option for post-fault strategies, the comparative study between VSD and MS methods are demonstrated in order to analyse their dynamic performance in nominal and faulty conditions. This take into account the equivalent harmonic inductance variation, which is then used to introduce the postfault control strategy. A double three-phase IPM machine is modelled and operated in two different operating conditions: nominal and one three-phase set of windings in open-circuit (OC). In OC fault, the proportional and integral (PI) controllers are re-designed while adapting the inductance variation. The current dynamics responses are analysed in both healthy and faulty conditions by means of Matlab/Simulink ® simulations.

	MRAS-based sensorless field oriented controlled axial flux permanent magnet synchronous machine with additional parameter adaptation By Michael BRÜNS, Christian RUDOLPH	[View] [Download]
Abstract: The characteristics of a sensorless control method for synchronous machines with a parallel model are investigated, in consideration of additional online parameter adaptation. Using error compensated reference voltage inputs the parallel model's parameters are adapted to the synchronous machine by comparing the model current output with the measured current values. Thus the adaptation to the reference transfer behavior of the system is accomplished using an implicit method. After describing the difference between the reference and the adaptive model mathematically, the system stability is analysed using Popov's hyperstability condition. An additional stability criterion could be derived from the full machine model. The extension of the sensorless control was achieved through a simultaneous adaptation algorithm accounting for coupling effects caused by the influence of misalignment of the field-coordinates.

	Online Inductance Identification of Permanent Magnet Synchronous Motor Based on Extended Kalman Filter With Dead-Time Compensation By Kai YANG, Guoyi QIU, Cheng LUO	[View] [Download]
Abstract: A dq-axis inductance identification method is proposed for permanent magnet synchronous motor (PMSM) , which is based on an extended Kalman filter with dead-time compensation. The proposed method is intended to estimate the disturbance voltage in the dq coordinate system, which is caused by dead-time and non-ideal switching characteristics of the power devices. The proposed method is achieved by means of parametric calculation, which is then fed into the Kalman filter to compensate the dead-time effect. Furthermore, the sensitivity analyses of the input parameters demonstrate that the accuracy of the extended Kalman filter discrimination is contingent on the precision of the input parameters. The effectiveness of the proposed method is demonstrated by simulation results.

	Performance analysis of PMSM servo-drive with state feedback and hybrid position controllers By Tomasz TARCZEWSKI, Hubert LISINSKI, Lech GRZESIAK	[View] [Download]
Abstract: High-performance operation of servo-drivewith permanent magnet synchronous motor (PMSM) is requiredin many industrial applications, including robotics,machines, and, recently, aircraft components. Complexcontrol structures are necessary to meet the specific requirementsof these applications. In this paper, two controlstructures developed for position control of PMSM servodriveare presented. The state feedback control (SFC)structure augmented by state variables' limitation andload torque compensation is presented and comparedwith a hybrid control structure (HSC) where the innercurrent control loop exists. An experimental evaluationof both control schemes regarding dynamic properties,disturbance compensation, and robustness against themoment of inertia changes is included.

	Sensorless Position Control of Synchronous Reluctance Motor with Real Time Path Generation By Federico CENTI, Andrea CREDO, Giuseppe FABRI, Rama SALLOUM, Marco TURSINI	[View] [Download]
Abstract: This paper presents a sensorless position controlfor synchronous reluctance motors with real-timepath generation. Sensorless control employs highfrequency flux injection with digitaldemodulation by sampling. The path generationis embedded in the drive microcontroller makingavailable the use of fast feedforward actions bothin the control loops and in the sensorless engine.The experimental results show the feasibility ofthe approach although the intrinsic positionestimation error of the high-frequency injectionlimits the speed range.