Radial Force

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Angelo Tani - One of the best experts on this subject based on the ideXlab platform.

  • Radial Force control for triple three phase sectored spm machines part ii open winding fault tolerant control
    IEEE Workshop on Electrical Machines Design Control and Diagnosis, 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    A new advanced fault tolerant control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSIs). The proposed current control technique is firstly exploited to avoid the Radial Force appearance in case of open winding of one machine sector. Then, the Radial Force fault tolerant control is improved to compensate for a bearing fault or another source of Radial Force in this open winding condition. Finite element simulations are used to validate the two proposed control techniques. Finally, advantages and drawbacks of the solution are highlighted.

  • Radial Force control for triple three-phase sectored SPM machines. Part I: Machine model
    2017 IEEE Workshop on Electrical Machines Design Control and Diagnosis (WEMDCD), 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    The Radial Force control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). A machine model is developed, based on the multi space vector approach. The multi space vector current control technique is exploited to control the torque and the Radial Force. The Radial Force control can be useful to compensate for a bearing fault or for a rotor eccentricity. Finite element simulations are used to validate the model and the control technique. Finally, criticalities of the control and modelling aspects are discussed.

Sheng-ming Yang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental verification of Radial Force control for a PMSM self-bearing motor drive
    IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society, 2011
    Co-Authors: Sheng-ming Yang, Chia-wei Chou
    Abstract:

    This paper presents a Radial Force control scheme for self-bearing operation of a surface permanent magnet synchronous motor. The control scheme is based on a self-bearing motor which consists of separate torque and suspension windings. Torque winding produces rotational torque, and the suspension winding produces Radial Force for rotor levitation. Calculated winding currents are combined internally in the controller. Thus, only a set of winding is required to produce controllable Radial Force and rotational torque. Analysis, implementation, and experimental verifications of the proposed scheme are presented.

  • Improvements of Radial Force control for a SPM Type PMSM self-bearing motor drive
    2009 IEEE Energy Conversion Congress and Exposition, 2009
    Co-Authors: Sheng-ming Yang, Chih-chun Chen
    Abstract:

    This paper presents a Radial Force control scheme for self-bearing operation of a surface permanent magnet synchronous motor. The scheme is based on a self-bearing motor which consists of the main and suspension windings. The main winding produces rotational torque, and the suspension winding produces Radial Force for rotor levitation. The calculated currents for these windings are combined internally in the controller. Consequently, only a set of windings is required to produce both the Radial Force and rotational torque in the motor. An improved Force model which considering the permanent magnet pull Force is also presented. The control scheme is designed according to this model. Both the finite-element analysis and the experiment verifications of the proposed scheme are performed.

  • An Approach to Producing Controlled Radial Force in a Switched Reluctance Motor
    IEEE Transactions on Industrial Electronics, 2007
    Co-Authors: Feng-chieh Lin, Sheng-ming Yang
    Abstract:

    Unbalanced Radial Force acting on a rotor shaft is undesirable because it causes motor vibrations. However, motor vibrations can be reduced with intentionally produced shaft Radial Force which cancels the existing unbalanced Radial Forces due to a nonuniform air gap or external load. Due to its special structure, the shaft Radial Force and torque of a switched reluctance motor (SRM) can be separately controlled when all pole currents are controlled independently. However, control of SRM Radial Force is rarely discussed in the existing literature. This paper presents a scheme that produces a controlled Radial Force for a 12/8-pole SRM. In this scheme, mutual inductances between stator poles are included in the control model. The motor torque is controlled with the conventional method, i.e., all poles in the conduction phase are energized with the same current to produce the desired torque. Two extra poles from the descending-inductance phase are energized to produce the desired Radial Force. The cross-coupling torque produced by the Force producing poles is compensated. The experimental results have verified that when controlled with the proposed scheme, the SRM was able to produce a controlled Radial Force when at standstill or running, and subjected to a load torque.

  • Instantaneous Shaft Radial Force Control with Sinusoidal Excitations for Switched Reluctance Motors
    IEEE Transactions on Energy Conversion, 2007
    Co-Authors: Feng-chieh Lin, Sheng-ming Yang
    Abstract:

    Unbalanced Radial Forces acting on a rotor shaft exist in motor applications where the external load is not balanced or when the rotor is not centered causing a nonuniform air gap. These Forces are undesirable as they cause motor vibrations. In view of its special structure, the shaft Radial Force and the torque of a three-phase 12/8 pole switched reluctance motor (SRM) can be separately controlled by proper pole current selection in the energized phase. Therefore, Radial Forces can be produced intentionally to cancel the existing Radial Force produced by rotor eccentricity and the unbalanced load inertia. The motor vibrations are thereby reduced. In this paper, a sinusoidal current excitation scheme is proposed for the torque and Radial Force control of a 12/8 pole SRM. When controlled with the selected sinusoidal currents, the SRM can simultaneously produce the desired shaft Radial Force in any rotational plane direction and the required rotational torque. As all pole currents are individually controlled, a more sophisticated phase commutation strategy is also proposed that provides smoother torques and Radial Force ripples.

  • Radial Force Control of a Switched Reluctance Motor with Two-Phase Sinusoidal Excitations
    Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting, 2006
    Co-Authors: Feng-chieh Lin, Sheng-ming Yang
    Abstract:

    Due to its special structure, the shaft Radial Force and torque of switched reluctance motor can be separately controlled by proper selection of pole currents. When all the pole currents are controlled independently, it is possible to produce the required Radial Force to cancel the existing Radial Force caused by non-uniform air gap or external load, and consequently motor vibrations can be reduced. In this paper, a Radial Force control scheme which use single or two phase sinusoidal excitations for 12/8 pole SRM is proposed. The pole currents of the conduction phase are energized with phase-shifted sinusoidal currents. Depending on the requested Radial Force and motor torque, the phase with descending-inductance may also be energized to increase Radial Force production. The requested Force and torque are synthesized from the Force and torque produced by these phases. The proposed scheme was verified with finite-element analysis and experiments.

Chris Gerada - One of the best experts on this subject based on the ideXlab platform.

  • Radial Force control of multisector permanent magnet machines for vibration suppression
    IEEE Transactions on Industrial Electronics, 2018
    Co-Authors: Giorgio Valente, Luca Papini, Andrea Formentini, Chris Gerada, Pericle Zanchetta
    Abstract:

    Radial Force control in electrical machines has been widely investigated for a variety of bearingless machines, as well as for the conventional structures featuring mechanical bearings. This paper takes advantage of the spatial distribution of the winding sets within the stator structure in a multisector permanent-magnet (MSPM) machine toward achieving a controllable Radial Force. An alternative Force control technique for MSPM 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. The experimental validation of the proposed control strategy is presented, focusing on the suppression of selected vibration frequencies for different rotational speeds.

  • Radial Force control for triple three phase sectored spm machines part ii open winding fault tolerant control
    IEEE Workshop on Electrical Machines Design Control and Diagnosis, 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    A new advanced fault tolerant control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSIs). The proposed current control technique is firstly exploited to avoid the Radial Force appearance in case of open winding of one machine sector. Then, the Radial Force fault tolerant control is improved to compensate for a bearing fault or another source of Radial Force in this open winding condition. Finite element simulations are used to validate the two proposed control techniques. Finally, advantages and drawbacks of the solution are highlighted.

  • Radial Force control for triple three-phase sectored SPM machines. Part I: Machine model
    2017 IEEE Workshop on Electrical Machines Design Control and Diagnosis (WEMDCD), 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    The Radial Force control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). A machine model is developed, based on the multi space vector approach. The multi space vector current control technique is exploited to control the torque and the Radial Force. The Radial Force control can be useful to compensate for a bearing fault or for a rotor eccentricity. Finite element simulations are used to validate the model and the control technique. Finally, criticalities of the control and modelling aspects are discussed.

  • Radial Force control of multi-sector permanent magnet machines
    2016 XXII International Conference on Electrical Machines (ICEM), 2016
    Co-Authors: Giorgio Valente, Luca Papini, Andrea Formentini, Chris Gerada, Pericle Zanchetta
    Abstract:

    The paper presentsn alternative Radial Force control technique for a Multi-Sector Permanent Magnet machine (MSPM). Radial Force control has been widely investigated for a variety of bearingless machines and can be also applied to conventional PMSM aiming the reduction of the mechanical stress on the bearings as well as reduce the overall vibration. Traditional bearingless motors rely on two independent sets of windings dedicated to torque and suspension respectively. The work presented in this paper takes advantage of the spatial distribution of the winding sets within the stator structure towards achieving a controllable net Radial Force. In this paper the α-β axis model for the MSPM and the theoretical investigation of the Force production principle is presented. A novel Force control methodology based on the Single Value Decomposition (SVD) technique is described. The predicted performances of the MSPM have been validated using Finite Element simulations and benchmarked against state of the art control techniques.

Giacomo Sala - One of the best experts on this subject based on the ideXlab platform.

  • Radial Force control for triple three phase sectored spm machines part ii open winding fault tolerant control
    IEEE Workshop on Electrical Machines Design Control and Diagnosis, 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    A new advanced fault tolerant control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSIs). The proposed current control technique is firstly exploited to avoid the Radial Force appearance in case of open winding of one machine sector. Then, the Radial Force fault tolerant control is improved to compensate for a bearing fault or another source of Radial Force in this open winding condition. Finite element simulations are used to validate the two proposed control techniques. Finally, advantages and drawbacks of the solution are highlighted.

  • Radial Force control for triple three-phase sectored SPM machines. Part I: Machine model
    2017 IEEE Workshop on Electrical Machines Design Control and Diagnosis (WEMDCD), 2017
    Co-Authors: Giacomo Sala, Chris Gerada, David Gerada, Angelo Tani
    Abstract:

    The Radial Force control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). A machine model is developed, based on the multi space vector approach. The multi space vector current control technique is exploited to control the torque and the Radial Force. The Radial Force control can be useful to compensate for a bearing fault or for a rotor eccentricity. Finite element simulations are used to validate the model and the control technique. Finally, criticalities of the control and modelling aspects are discussed.

Akira Chiba - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous Torque and Radial Force Ripple Control for Reduction of Acoustic Noise and Vibration in Switch Reluctance Machines
    2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018
    Co-Authors: Omer Gundogmus, Mohammed Elamin, Yilmaz Sezer, Akira Chiba
    Abstract:

    SRM has high torque and Radial Force ripple, as a result it has the disadvantages of large vibration and acoustic noise compared to other types of electric machines. This paper introduces a new torque ripple and Radial Force ripple reduction technique which generates optimum current profile using multi objective optimum control algorithms. Electromagnetic Finite Element Analysis have been performed to develop SRM model for predicting the torque and Radial Force generation. The proposed current profiling technique develops off-line current shaping aiming to reduce both the torque ripple and the Radial Force ripple simultaneously. 2D and 3D Multi-physics simulations have been performed to evaluate the vibration and acoustic noise performance of the SRM drive operating with conventional and proposed optimal current waveforms. Simulation results proved that the proposed current profile can reduce the vibration and acoustic noise significantly.

  • Approximation of Radial Force in highly saturated region of switched reluctance motor
    2016
    Co-Authors: Jihad Furqani, Masachika Kawa, Kyohei Kiyota, Akira Chiba
    Abstract:

    In this paper, an approximation of Radial Force in highly saturated region of a switched reluctance motor is investigated. From FEM results, it is known that Radial Force is depending on two components, those are electrical rotational position and current. In addition, the mutual effect of another phase is also included in the approximation. The principle of Radial Force approximation is based on the Fourier series method.

  • A relationship of Radial Force sum and current waveforms in switched reluctance motor for noise reduction
    2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015
    Co-Authors: Noboru Kurihara, Akira Chiba, Kentaro Yamada, Akihiko Souda
    Abstract:

    In this paper, current command to reduce noise and vibration of switched reluctance motors have been investigated. Noise and vibration were reported to be significantly reduced by making a Radial Force sum as flat as possible with current profiling. In order to realize flat Radial Force sum, dc, fundamental, and second harmonic components were required. The dc and fundamental components are determined by torque requirement, thus, the second harmonic amplitude i 2 and phase shift ϕ 2 are adjusted to minimize variation of Radial Force sum of three-phase stator teeth. In this paper, i 2 and ϕ 2 are intentionally varied to see how Radial Force sum changes. Mathematical analysis is also carried. It was found that the third harmonic component is zero if i 2 and ϕ 2 are properly selected. The sixth harmonic component is also found to be limited. In addition 9, 12, 15, 18 and higher, and other harmonics 1, 2, 4, 5, 7, 8, 10, 11… are inherently zero, and only dc component remains. Effectiveness is verified in experiments in small size and full size test switched reluctance motors.

  • Radial Force and speed detection for improved magnetic suspension in bearingless motors
    IEEE Transactions on Industry Applications, 2006
    Co-Authors: Akira Chiba, Mustafizur Rahman, K. Kiryu, T. Fukao
    Abstract:

    In this paper, Radial Forces and speeds are detected and used in negative feedback loops to enhance damping factors and response speed in bearingless induction motors. Radial Forces and speeds are calculated from the detected Radial Force fluxes. Both Radial Force and torque generating fluxes are detected from search coil fluxes wound around stator teeth. The effectiveness on improving damping of Radial positioning is shown both theoretically and experimentally.

  • Effects of magnetic saturation on Radial Force of bearingless synchronous reluctance machines
    Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting, 1993
    Co-Authors: Akira Chiba, Tadashi Fukao, M. Hanazawa, M.a. Rahman
    Abstract:

    The effects of magnetic saturation on Radial Force production in synchronous reluctance type bearingless motors are discussed. MMFs are calculated and flux densities are derived with approximated magnetic saturation curve. The Radial Force is almost proportional to the difference of squared flux densities. The maximum Radial Force is limited by magnetic saturation. To achieve maximum Radial Force, motor excitation has to be set to an optimal value. The Force constant (Radial Force/Radial Force winding current) can also be maximized at the optimal excitation. The maximum Radial Force value is derived.