Rotor Position

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Seung-ki Sul - One of the best experts on this subject based on the ideXlab platform.

  • design and control of ipmsm sensorless drive for mechanical Rotor Position estimation capability
    IEEE Journal of Emerging and Selected Topics in Power Electronics, 2014
    Co-Authors: Yongcheol Kwon, Seung-ki Sul, Noor Aamir Baloch, Sohji Murakami, Shinya Morimoto
    Abstract:

    In this paper, a design and control method of interior permanent magnet synchronous machines (IPMSMs), which is controlled in sensorless Position control mode based on high frequency signal injection, for absolute Position estimation and control capability has been addressed. Although conventional motor designs with symmetric structure work well in sensorless speed and torque control modes, their actual mechanical Rotor Position is unidentifiable since their inductance profile is repeated for every electrical revolution. To realize the mechanical Rotor Position estimation capability, from a given template six-pole/nine-slot IPMSM with symmetric structure, an IPMSM design with asymmetric winding and asymmetric Rotor geometry is proposed and constructed as a prototype. Based on the proposed design, the mechanical Rotor Position can be identified at the cost of slight degradation of basic motor characteristics such as torque ripples, harmonics in back EMF, and so on. The overall performances of the proposed IPMSM have been evaluated by rigorous finite element method simulations and experiments.

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous permanent magnet (PM) motor can be detected by means of the injection of a high-frequency stator voltage superimposed to the fundamental component. Thanks to the Rotor anisotropy, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques are considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and d-and q-axis cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, together with two Rotor geometries, that is, IPM and inset Rotor. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the PM Rotor geometry. Conversely, the choice of the sensorless control technique affects slightly the Rotor Position detection.

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    Power Electronics Specialists Conference, 2006
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous Permanent Magnet (PM) motor can be detected by means of the superimPosition of a high-frequency component to the steady-state stator voltage. Thanks to the anisotropy of the Rotor, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques can be considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, in conjunction with some Rotor geometries. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the choice of the sensorless control technique together with a proper PM Rotor geometry.

  • Initial Rotor Position detection of PMSM at standstill without rotational transducer
    IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 1
    Co-Authors: Dae-woong Chung, Jun-koo Kang, Seung-ki Sul
    Abstract:

    This paper presents a new standstill Rotor Position detecting algorithm for nonsalient permanent magnet synchronous machine (PMSM) without any Position sensor. By injecting high frequency current to the stator of the machine, the proposed algorithm provides the standstill Rotor Position with reasonable accuracy as well as the direction of magnetization. Though this paper focuses on the nonsalient PMSM, the proposed algorithm also works more effectively in the case of the salient machine such as an interior permanent magnet machine. From the experiments, the standstill Rotor Position is successfully detected within /spl plusmn/5/spl deg/ error in electrical degree.

Silverio Bolognani - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Stator and Rotor Saturation on Sensorless Rotor Position Detection
    IEEE Transactions on Industry Applications, 2013
    Co-Authors: Nicola Bianchi, Emanuele Fornasiero, Silverio Bolognani
    Abstract:

    This paper investigates the impact of the geometry of a permanent-magnet (PM) motor on the capability to detect the Rotor Position without sensors by means of a high-frequency signal injection. An interior PM motor with three Rotor flux barriers is considered, which is characterized by a magnetic saliency, necessary for the sensorless Rotor Position detection. The objective is twofold: 1) to keep an adequate saliency in all the operating range of the motor, including operations at high current, and 2) to limit the angular error of the Rotor detection, which is due to the effect of the cross-saturation between the d- and the q-axes. The phenomenon of iron saturation is deeply analyzed, highlighting how the saturation of both the stator and Rotor affects the machine performance, in terms of sensorless Rotor Position detection capability. To this purpose, the motor geometry is modified so as to achieve a higher iron saturation in the stator and, then, in the Rotor. Then, the volume of the PM is changed so as to emphasize the impact of the PM flux. Different Rotor geometries are finally compared with the initial one

  • Rotor Position estimation in IPM motor drives based on PWM current harmonics
    2011 IEEE International Electric Machines & Drives Conference (IEMDC), 2011
    Co-Authors: Silverio Bolognani, Adriano Faggion, L. Sgarbossa
    Abstract:

    The paper investigates successfully the possibility of extracting the Rotor Position information of an Interior Permanent Motors from the PWM current harmonic contents. To this aim, a general description of PWM voltage harmonics is at first given. Current harmonics are then derived assuming an anisotropic Rotor and pointing out the Rotor Position dependence. It is proved that Rotor Position information can be detected if single edge PWM is adopted. A speed and Position estimation scheme is illustrated and the new Rotor Position estimation technique is then validated by simulations and preliminary experimental tests.

  • A new proposal of Rotor Position estimation in IPM motor drives based on PWM current harmonics
    2010 First Symposium on Sensorless Control for Electrical Drives, 2010
    Co-Authors: Adriano Faggion, Silverio Bolognani
    Abstract:

    The paper investigates successfully the possibility of extract Rotor Position information of Interior Permanent Motors from PWM current harmonic contents. To this aim, a general description of PWM voltage harmonics is at first given. Current harmonics are then derived assuming an anisotropic Rotor. It is proved that Rotor Position information can be derived if single edge PWM is adopted. A speed and Position estimation scheme is illustrated and the new Rotor Position estimation technique is then validated by simulations.

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous permanent magnet (PM) motor can be detected by means of the injection of a high-frequency stator voltage superimposed to the fundamental component. Thanks to the Rotor anisotropy, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques are considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and d-and q-axis cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, together with two Rotor geometries, that is, IPM and inset Rotor. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the PM Rotor geometry. Conversely, the choice of the sensorless control technique affects slightly the Rotor Position detection.

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    Power Electronics Specialists Conference, 2006
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous Permanent Magnet (PM) motor can be detected by means of the superimPosition of a high-frequency component to the steady-state stator voltage. Thanks to the anisotropy of the Rotor, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques can be considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, in conjunction with some Rotor geometries. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the choice of the sensorless control technique together with a proper PM Rotor geometry.

Nicola Bianchi - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Stator and Rotor Saturation on Sensorless Rotor Position Detection
    IEEE Transactions on Industry Applications, 2013
    Co-Authors: Nicola Bianchi, Emanuele Fornasiero, Silverio Bolognani
    Abstract:

    This paper investigates the impact of the geometry of a permanent-magnet (PM) motor on the capability to detect the Rotor Position without sensors by means of a high-frequency signal injection. An interior PM motor with three Rotor flux barriers is considered, which is characterized by a magnetic saliency, necessary for the sensorless Rotor Position detection. The objective is twofold: 1) to keep an adequate saliency in all the operating range of the motor, including operations at high current, and 2) to limit the angular error of the Rotor detection, which is due to the effect of the cross-saturation between the d- and the q-axes. The phenomenon of iron saturation is deeply analyzed, highlighting how the saturation of both the stator and Rotor affects the machine performance, in terms of sensorless Rotor Position detection capability. To this purpose, the motor geometry is modified so as to achieve a higher iron saturation in the stator and, then, in the Rotor. Then, the volume of the PM is changed so as to emphasize the impact of the PM flux. Different Rotor geometries are finally compared with the initial one

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    IEEE Transactions on Power Electronics, 2007
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous permanent magnet (PM) motor can be detected by means of the injection of a high-frequency stator voltage superimposed to the fundamental component. Thanks to the Rotor anisotropy, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques are considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and d-and q-axis cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, together with two Rotor geometries, that is, IPM and inset Rotor. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the PM Rotor geometry. Conversely, the choice of the sensorless control technique affects slightly the Rotor Position detection.

  • comparison of pm motor structures and sensorless control techniques for zero speed Rotor Position detection
    Power Electronics Specialists Conference, 2006
    Co-Authors: Nicola Bianchi, Silverio Bolognani, Jihoon Jang, Seung-ki Sul
    Abstract:

    The Rotor Position of a synchronous Permanent Magnet (PM) motor can be detected by means of the superimPosition of a high-frequency component to the steady-state stator voltage. Thanks to the anisotropy of the Rotor, the corresponding high-frequency current is modulated and used to determine the Rotor Position. Two techniques can be considered: the first one adopts a pulsating voltage vector in the estimated synchronous reference frame, while the second one adopts a rotating voltage vector. These techniques are effective at zero and at low motor speed. The accuracy of the Rotor Position detection depends strictly on the Rotor saliency, that is, on the geometry of the PM Rotor. In fact both saturation and cross-coupling have a heavy influence on the correct Rotor Position detection. The aim of this paper is to compare the two sensorless control techniques, in conjunction with some Rotor geometries. In order to highlight the effectiveness of the sensorless technique, the tests are carried out at various operating conditions. It is found that the effectiveness of the sensorless Rotor Position detection strongly depends on the choice of the sensorless control technique together with a proper PM Rotor geometry.

Wu Jian - One of the best experts on this subject based on the ideXlab platform.

  • Modeling and Simulation of Soft Sensor of Rotor Position for Switched Reluctance Motor
    Computer Simulation, 2010
    Co-Authors: Wu Jian
    Abstract:

    Rotor Position detection is essential to the speed regulation system of SRM.Duo to the doubly salient structure of SRM,its Rotor Position is a highly nonlinear function of stator winding current and flux linkage,so general linear methods are hard to achieve precise results.This paper presents an approach of Rotor Position estimation for switched reluctance motor based on BP neural network.In this thesis,Soft sensor modeling for SRM Rotor Position using BP neural network is used for the BP neural network,the training data are comprised of magnetiaztion data of the SRM in which the phase current and phase flux linkage are input data and the corresponding Position is the output.Through off-line and online training,the BP neural network can build up a correlation among phase current,phase flux linkage and Position,thereby facilitating the detection of the Rotor Position sensorless.The simulation and experimental results show that this method can achieve correct Rotor Position estimation,and thus the sensorless control of SRM is realized.

Sun Hai-meng - One of the best experts on this subject based on the ideXlab platform.

  • Study on Rotor Position Identification of Permanent Magnet Synchronous Motor
    IEEE Transactions on Power Electronics, 2010
    Co-Authors: Sun Hai-meng
    Abstract:

    The estimation result of the Rotor Position for permanent magnet synchronous motor(PMSM) maybe reverse with traditional pulsing high-frequency voltage signal injection method,since this method cannot recognize N/S Rotor polarity.A new method is proposed to identify Rotor Position based on motor saturation effect.N/S polarity is distinguished by analyzing the second high-frequency current component with Rotor Position error information,and then Rotor Position can be easily obtained.The experiment is implemented on a PMSM with salient pole.The experimental results verify the proposed approach,and it achieves the valid Rotor Position polarity identification.

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