Signal Injection in Sensorless PMSM Drives Equipped With Inverter Output Filter

Piippo, A.; Salomaki, J.; Luomi, J.

doi:10.1109/pccon.2007.373104

Cited by 16 publications

(15 citation statements)

References 19 publications

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“…In practice, however, the inverter non-idealities and the inaccuracies of the system parameters cause stability problems in sustained operation at low speeds under load. These problems can be solved by augmenting the adaptive observer with a signal injection method [17]. Signal injection is not used in the following experimental results.…”

Section: Speed-sensorless Vector Controlmentioning

confidence: 99%

Influence of Inverter Output Filter on Maximum Torque and Speed of PMSM Drives

Salomaki¹,

Hinkkanen²,

Luomi³

2007

2007 Power Conversion Conference - Nagoya

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Abstract-The paper deals with the maximum torque and speed of permanent magnet synchronous motor (PMSM) drives when the inverter output voltage is filtered by an LC filter with a cut-off frequency well below the switching frequency. According to steady-state analysis, the filter affects the performance of the motor drive especially at high speeds. The stator current is not equal to the inverter current, and due to the inverter current and inverter voltage limits, the torque-maximizing stator current locus differs from that of a drive without the filter. A field-weakening method is proposed for PMSM drives with an inverter output filter. The method is implemented and tested in a 2.2-kW PMSM drive. The experimental results agree well with the analysis, and validate the high-speed performance of the proposed field-weakening method.Index Terms-Permanent magnet synchronous motor (PMSM) drives, inverter output filter, field-weakening control, vector control.

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Section: Speed-sensorless Vector Controlmentioning

confidence: 99%

Influence of Inverter Output Filter on Maximum Torque and Speed of PMSM Drives

Salomaki¹,

Hinkkanen²,

Luomi³

2007

2007 Power Conversion Conference - Nagoya

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“…In the literature, a plethora of PMSM sensorless approaches have been proposed that could be mainly classified into two strategies: the fundamental excitation and saliency and signal injection [3][4][5][6][7]. The first strategy has been established based on the state observer methodology using only measurements of fundamental excitation variables such as stator voltages and currents.…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of Permanent Magnet Synchronous Machine with Magnetic Saliency Tracking Based on Voltage Signal Injection

Ilioudis

2020

Machines

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This paper presents a sensorless control method of a permanent magnet synchronous machine (PMSM) with magnetic saliency estimation. This is based on a high-frequency injection (HFI) technique applied on the modified PMSM model in the γδ reference frame. Except for sensorless control, an emphasis is placed on the magnetic saliency estimation to indicate a practical approach in tracking PMSM inductance variations. The magnetic saliency is determined using calculations embedded in the speed and position algorithm through current measurements. A notable characteristic of the modified PMSM model is that the corresponding rotor flux integrates both permanent magnet and saliency term fluxes. In applying a HFI technique for sensorless control, the structure of the PMSM flux model is formatted accordingly. A novel inductance matrix is derived that is completely compatible with the HFI methodology, since its elements include terms of angle error differential and average inductances. In addition, a sliding mode observer (SMO) is designed to estimate the speed and angle of rotor flux based on equivalent control applying a smooth function of the angle error instead of a sign one to reduce the chattering phenomenon. The control strategy is principally based on the adequacy of the proposed modified model and on the appropriateness of the SMO structure to successfully track the rotor flux position with the required stability and accuracy. Simulation results demonstrate the performance of the PMSM sensorless control verifying the effectiveness of the proposed algorithm to detect PMSM saliency, speed and position in steady state and transient modes successfully. Keywords: sensorless control of PMSM; sliding mode observer (SMO); magnetic saliency estimation; modified rotor flux; high frequency injection (HFI) Notation u d , u q = dq axis stator voltages i d , i q = dq axis stator currents λ d , λ q = dq axis stator magnetic fluxes λ m = rotor magnetic flux L d , L q = dq axis inductances ΣL =(L d +L q )/2 = average inductance ∆L = (L d -L q )/2 = differential inductance r s = stator resistance u γ , u δ = γδ axis stator voltages i γ , i δ = γδ axis stator currents λ γ , λ δ = γδ axis stator magnetic fluxes p = number of pole pairs θ = θ e = electrical angular position ω = ω e = electrical angular speed Machines 2020, 8, 14 3 of 20However, the observers in the αβ stationary reference frame suffer from phase delay between the real and the estimated EMF, since the real extended EMF is a sinusoidal signal [18,20]. This undesired phase delay is due to the observer operation, which is similar to signal filtering. Despite the αβ stationary frame, PMSM variables, such as flux and extended EMF, are constant quantities in the dq (direct-quadrature) synchronous rotating reference frame that, however, cannot be applied directly. An advantageous alternative proposal is to express PMSM mathematical model in the γδ reference frame, which is rotating at estimated angular velocityω and lagging behind the dq synchronous reference frame by electrical...

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“…This imposes the use of observers in order to realize sensor-less control design [1]. Since many observers for PMSM sensorless control are available, such as the extended Kalman filter [2], the full order and the reduced order observers [3,4], the LMI based methods [5], the high-frequency signal injection methods [6,7], the sliding mode observers [8,9,10], and so on, the main research stream has been focused on searching for reliable speed and position estimation methods with the aim of replacing the mechanical sensors with the observer in the control system [11][12][13][14]. However, the current problems with successful application of sensor-less control for PMSM are the existence of operating regimes for which the observer performance is remarkably deteriorated due to the difficulties in correct estimation of the motor position.…”

Section: Introductionmentioning

confidence: 99%

Observability Analysis and Improved Zero‐Speed Position Observer Design of Synchronous Motor with Experimental Results

Zaltni¹,

Ghanes²

2012

Asian Journal of Control

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This paper deals with the permanent magnet synchronous motor (PMSM) observability analysis for sensorless control design. The problem of loss of observability at low frequency range is always recognized in experimental settings. Nevertheless, there are no sufficient theoretical observability analyses for the PMSM. In the literature, only the sufficient observability condition has been presented. Therefore, the current work is aimed especially towords the necessary observability condition analysis. Furthermore, improved zero-speed observation is presented here for a surface PMSM (SPMSM) to overcome position observability problems at zero-speed which is an unobservable state point. The proposed observer based on higher order sliding mode (HOSM) is designed in order to ensure robustness against disturbances and to avoid the chattering phenomenon which is inherent in standard first order sliding modes. The stability and finite time convergence of the developed observer are studied and discussed. Experimental results are carried out to illustrate the effectiveness and robustness of the proposed observer. d dt P J L L i i f J T J [ sin( ) cos( ) ] 2 1 v v l J T J ω −

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Signal Injection in Sensorless PMSM Drives Equipped With Inverter Output Filter

Cited by 16 publications

References 19 publications

Influence of Inverter Output Filter on Maximum Torque and Speed of PMSM Drives

Influence of Inverter Output Filter on Maximum Torque and Speed of PMSM Drives

Sensorless Control of Permanent Magnet Synchronous Machine with Magnetic Saliency Tracking Based on Voltage Signal Injection

Observability Analysis and Improved Zero‐Speed Position Observer Design of Synchronous Motor with Experimental Results

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