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An improved initial rotor position estimation method based on signal injection for position sensorless interior permanent magnet synchronous motor (PMSM) at standstill is presented. In first step, high-frequency rotating voltage signal is injected into stator wingding to obtain magnetic pole position. A PI tracing observer is used to regulate the error signal containing magnetic pole position information...
The phase, frequency, and amplitude of single-phase voltages are the most important and basic information required for single-phase grid connected applications. This paper proposes a new “D-estimation method” for instantly estimating the phase, frequency, and amplitude of frequency-varying single-phase signals in such applications. The D-estimation method has the following attractive features: 1)...
So far, the authors' group have developed a pitching control method for electric vehicle (EV) based on the quick torque response of motors in order to improve the driving comfort. In this paper, a novel estimation method of braking torque is proposed to generate ideal vehicle acceleration for pitching control. The acceleration reference can be obtained from the estimated braking torque, motor torque,...
A new position-sensorless method has been developed for a permanent magnet synchronous motor (PMSM) drive at low speed. This method utilizes the induced voltage caused by magnetic saturation of PMSM. The rotor position can be detected by using the open phase voltage of a conventional 120-degree commutation. No harmonic injection is needed. This paper discusses the principle of the proposed method...
A sensorless control strategy for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) is proposed. The proposed method is based on recursive least square estimation (RLSE) algorithm for rotor speed estimation using an equation containing only stator flux and current. Further, rotor position information used for coordinate transformation is computed...
Owing to the few signals are generated using low resolution position sensor at low speed, rotor position estimation is difficult in drum washing machine application. Besides, inertia of water and drum makes the initial load to almost two times of rated load. Therefore over current can be occurred at initial operation and it can affect the control performance. In this paper, IPMSM vector control for...
This paper presents novel high-frequency signal injection-based self-sensing methods for four-phase switched reluctance machines. The methods cover full magnetic operating range of the drive including saturation and show compensation methods to improve the rotor position estimation under saturation. The effects of magnetic saturation on machine saliencies are studied and modified carrier signal injection...
This paper considers the smooth transition method between the signal injection and the back-EMF based sensorless algorithm for an interior(salient) permanent-magnet synchronous machines(IPMSMs). For the starting algorithm, signal injection techniques are used in the zero-speed and low-speed regions, and the back-electromotive force (EMF) based sensorless technique is used for higher speeds. A phase-locked...
This paper proposes a method for improving the performance of a position sensorless control system for an interior permanent magnet synchronous motor in the low-speed region. Accurate values of motor parameters are required for the model-based position sensorless control. In the case of extreme temperature variation and low-speed operation in particular, motor parameter error affects the accuracy...
This paper presents a new control method for a torque ripple compensation of permanent magnet synchronous motors (PMSMs). The control method is based on a new equation to estimate the instantaneous torque. The equation can accurately take into account variations of both a magnetic energy and a magnetic co-energy. To achieve a stable and an effective torque ripple reduction, a feedforward control and...
This paper presents a simulation model based on support vector regression (SVR) for flicker estimation emitted from wind turbines. Training patterns are developed by applying the moving window method to estimate the voltage flicker. A comparison is done for the fixed speed wind turbine (WT), which leads to a conclusion that the SVR based flicker measurement is effective and not limited by processing...
This paper describes a simplified sensorless vector control for permanent magnet synchronous motors (PMSM) using the average of the DC bus current. This method sets up the drive control system at relatively inexpensive because the micro controller does not need to have a precise timer and the calculation load is slight. The proposed method effectively changes two different current estimation methods...
This paper presents a basic scheme for rotor position estimation of salient synchronous machines by utilizing internal information of a predictive torque controller. Although the proposed estimation scheme is based on a rotor saliency and thereby capable of permanent operation at standstill, this method has no need for the injection of an additional voltage which extends the feasible operation region...
A Novel model reference adaptive system (MRAS) based speed estimation technique is presented in this paper. The speed estimator utilizes instantaneous and steady state values of V⃗* × I⃗ in the reference and adjustable models of the MRAS respectively. The major advantages of this method are: (i) flux estimation is not required and (ii) the method is stable in all the 4-quadrants of operation. The...
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