Radial force control of Multi-Sector Permanent Magnet machines considering radial rotor displacement

Valente, Giorgio; Papini, Luca; Formentini, Andrea; Gerada, Chris; Zanchetta, Pericle

doi:10.1109/wemdcd.2017.7947737

Cited by 8 publications

(6 citation statements)

References 15 publications

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“…System (24) is obtained merging systems (15) and (21) and assuming the rotor position as input of the MRC (21). Minimizing the cost function (23) results in a state feedback control law in the form…”

Section: Integration Of Mrc In the Optimal Position Controlmentioning

confidence: 99%

“…A forth order highcut filter is implemented in the practical derivative block. In the proposed work, the mathematical model of the MSPM machine is presented according to [11], [20], [21] in order to calculate the reference current optimized values for both radial force and torque production. In particular, the minimization of the stator Joule losses has been chosen as optimization objective.…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control

Valente

Formentini

Papini

et al. 2019

IEEE Trans. Power Electron.

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Abstract-Bearingless machines are relatively new devices that consent to suspend and spin the rotor at the same time. They commonly rely on two independent sets of three-phase windings to achieve a decoupled torque and suspension force control. Instead, the winding structure of the proposed multi-sector permanent magnet (MSPM) bearingless machine permits to combine the force and torque generation in the same three-phase winding. In this paper the theoretical principles for the torque and suspension force generation are described and a reference current calculation strategy is provided. Then, a robust optimal position controller is synthesized. A Multiple Resonant Controller (MRC) is then integrated in the control scheme in order to suppress the position oscillations due to different periodic force disturbances and enhance the levitation performance. The Linear-Quadratic Regulator (LQR) combined with the Linear Matrix Inequalities (LMI) theory have been used to obtain the optimal controller gains that guarantee a good system robustness. Simulation and experimental results will be presented to validate the proposed position controller with a prototype bearingless MSPM machine.

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Section: Integration Of Mrc In the Optimal Position Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control

Valente

Formentini

Papini

et al. 2019

IEEE Trans. Power Electron.

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“…Further considerations can be done to include the effect of rotor displacement in the x−y plane [22]. The equivalent description of the electromagnetic quantities in the Clarke reference frame is adopted to simplify the mathematics.…”

Section: B the Mathematical Modelmentioning

confidence: 99%

“…The no load components are dependant by means of the stator-rotor relative angular position [26] while the incremental ones consider the effect of current flowing in the three-phase winding [27]. A detailed procedure for the force coefficients calculation is presented in [22]. According to the harmonic spectrum of the coefficient presented in Fig.…”

Section: B the Torque Capabilitymentioning

confidence: 99%

Radial Force Control of Multisector Permanent-Magnet Machines for Vibration Suppression

Valente

Papini

Formentini

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-Radial force control in electrical machines has been widely investigated for a variety of bearingless machines as well as for conventional structures featuring mechanical bearings. This work takes advantage of the spatial distribution of the winding sets within the stator structure in Multi-Sector Permanent Magnet machine towards achieving a controllable radial force. An alternative force control technique for Multi-Sector Permanent Magnet machines is presented. The mathematical model of the machine and the theoretical investigation of the force production principle are provided. A novel force control methodology based on the minimization of the copper losses is described and adopted to calculate the d-q axis current references. The predicted performances of the considered machine are benchmarked against Finite Element Analysis. Experimental validation of the proposed control strategy is presented focusing on the suppression of selected vibration frequencies for different rotational speeds.

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“…UMP rises as eccentricity increases. Eccentricity in such machines is very important to research, as it is one of the causes of unwanted vibrations [5]. Machine research can be classified into two different categories.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

Sharukh,

kalita

2023

Preprint

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<p>Electrical machines with eccentrically positioned rotors experience strong unbalanced magnetic pull directed towards the narrowest air gap. This unbalanced force increases the rotor eccentricity and degrades machine performance. Accurate computation and reduction of electromagnetic force are required for controlling electromagnetic vibration, and this can be achieved by employing a bridge-configured winding scheme. This paper presents a two-dimensional bridge configured permanent magnet synchronous machine model to investigates the force compensating strategy under different eccentricity of PMSM. Furthermore, the force components under rotor eccentricity are compared with Bridge ON and Bridge OFF conditions. The connection of bridge points allows the different currents to flow in different coil groups, reducing the unbalanced magnetic pull. The modelling and simulation of PMSM have been done using time-stepping finite element method. The finding indicates that connecting the bridge points can significantly reduce the amplitude of the electromagnetic force components induced by different rotor eccentricities.</p>

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Radial force control of Multi-Sector Permanent Magnet machines considering radial rotor displacement

Cited by 8 publications

References 15 publications

Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control

Performance Improvement of Bearingless Multisector PMSM With Optimal Robust Position Control

Radial Force Control of Multisector Permanent-Magnet Machines for Vibration Suppression

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

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