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This paper proposes a sensorless field-oriented control(FOC) strategy for Surface-mount Permanent Magnet Synchronous Motor(SPMSM). Firstly, a rotor flux estimation method with a high pass filter is introduced. Secondly, the basic principle of PLL and PI parameters tuning method derivation are demonstrated. And then, the compensation method for the phase shift caused by the high pass filter has been...
This paper has focused on the modified sensorless method for PMSM drive, which could estimate the rotor position information with the small DC-link capacitor. Due to the evaporation of electrolyte with working time, the electrolytic capacitor is vulnerable to the current ripple and heat. Thus, the film capacitor is selected as the DC-link capacitor in recent years. However, the capacitance of film...
Many applications of induction machines require a model and its electrical and mechanical parameters. The parameters can be estimated during the machine's operation in closed-loop by recursive algorithms. On-line estimation algorithms can yield suitable results when parameter identifiability is guaranteed. This work analyzes the identifiability of the induction machine by the condition of sufficient...
This paper presents a novel angular velocity estimation strategy of a Reaction Sphere (RS) for satellite attitude control based on a Linear Parameter-Varying (LPV) Kalman Filter. The reaction sphere is a permanent magnet synchronous spherical actuator whose rotor is magnetically levitated and can be accelerated about any desired axis. The spherical actuator is composed of an 8-pole permanent magnet...
This paper proposes a highly improvised and a vibrant sensorless vector control of the three-phase induction motor drive, brought out by a combination of sliding mode control and Space vector pulse width modulated inverter, with “Direct synthesis from State Equations” (DSS) as the technique for estimating speed. Field oriented Vector control method of decoupling the flux and torque and controlling...
Rotor time constant is a key parameter in an induction motor drive with indirect field oriented control. In this paper, a modified Model Reference Adaptive Controller (MRAC) utilizing d-axis stator voltage is proposed for online updating of rotor time constant. Compared with the traditional d-axis voltage model, the information of torque current and stator frequency is incorporated into the adaptive...
A novel approach to estimate rotor position of a dual three-phase permanent magnet synchronous motor (PMSM) at low speed is investigated in this paper. A position estimation algorithm is developed in two dimensional nature static frame. Proposed algorithm exploits the transient response of line currents, which are integrated within fundamental PWM cycle to estimate rotor position and speed. For successful...
The present paper deals with the sensorless harmonic speed control of a drive for repetitive mechanical systems and proposes a harmonic control scheme, in which a proportional-integral controller is dedicated to each single harmonic component of the speed error. In addition, the harmonic speed controller provides information that can be used for the estimation of the load torque and for a diagnostic...
This paper presents an approach to estimate wind vector for a micro UAV by using only its inertial measurement unit in real-time. This method does not need additional sensors and dedicated anemometer, while just relying on the onboard inertial measurement unit to reserve the valuable payload for other onboard sensors. A smoothing filter is also designed based on the minimum summation of distance vector...
This paper improves the permanent magnet (PM) machine position sensorless drive specifically for high speed operation. To obtain the rotor position, an approximation is typically assumed on the position estimator where the estimated position is almost equal to the actual position per sample instant. This small signal approximation might not be valid at high speed when the ratio of sampling frequency...
This paper presents a mitigation strategy to reduce the risk of Subsynchronous Controller Interaction (SSCI) in Doubly-Fed Induction Generator (DFIG) based wind farms. SSCI mitigation is achieved through the modification of the controller structure within the DFIG turbine. A proportional damping controller tuned to the SSCI oscillatory frequency is proposed and implemented in the current controller...
This paper presents a model-based shadow estimation method that aims at identifying self-cast shadows of aerial vehicles in on-board images. The self-cast shadow poses a non-negligible problem in any kind of on-board processing, e.g. remote sensing, visual odometry, or target tracking. Therefore, it often is necessary to exclude the image regions that contain this self-cast shadow. The presented method...
The paper is devoted to the development and investigation of automatic correction system of rotor radial position updating of micro electric drive, used in high-precision processing systems. A new approach of solving the problem of stabilizing the rotating element of motor, based on active current updating of the spatial position is offered. The development of automatic control algorithm is done using...
This paper proposes a phase correction strategy for the zero sequence back EMF based sensorless drive under current regulation control (viz., I/f control). The straightforward phase correction process based on the nearest principle might lead to false correction under different load conditions. The proposed strategy can achieve robust phase correction by injecting transitory high frequency (HF) signal...
A resistance-or inductance-based saliency is needed as a prerequisite for signal-injection based encoder less position estimation methods. The differential quantities can be influenced by applying a short-circuited electrical winding on the rotor of an electrical machine. To optimize the position of this winding with little computational effort, a simplified model of the machine with a three-phase...
This paper investigates an ordinary least squares based indirect field oriented control (IFOC) of induction motor at very low speed range (1–5 rpm) using a low-count encoder. At very low speeds the speed estimation provided by common techniques for low-count encoder applications such as averaging the last two speed samples and/or considering the previous speed value until the next position update...
This paper addresses the method for total parameters identification in speed sensorless induction motor drives. By total parameters identification, it means that all the inverse-Γ circuit parameters are poorly known and need to be identified. Based on the parameter sensitivity, an alternating-current (AC) signal of medium frequency (25 Hz) is superimposed onto the stator magnetizing current, so that...
The paper addresses the problem of practical estimation of the parameters of induction machines without speed measurement and using only no-load transient voltages and currents, acquired during a startup test performed at the final stage of the production line at the manufacturer site. The test aims to enable a first estimate of the machine parameters, from which standard performance requirements...
This paper proposes a method for parameter estimation of three-phase induction machines based on the concept of instantaneous impedance and using only stator voltages and currents acquired during a no-load startup transient. Basically, the method estimates the parameters using an optimization algorithm which aims to reduce the error between estimated and measured instantaneous impedance. The algorithm...
This paper analyzes the position estimation capability on the saliency-based positon sensorless drive of permanent magnet (PM) machine. To obtain the rotor position information, high frequency (HF) voltage is persistently injected to provide the measurable spatial saliency signal. Although many saliency-based sensorless drives have demonstrated the comparable performance with low-end encoder-based...
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