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In switched-flux permanent magnet (SFPM) machines, the 6th-harmonic back electromotive force (EMF) is dominant, whilst the 3rd-harmonic back-EMF is much smaller. This paper proposes several new position estimation methods for sensorless control based on the 6th-harmonic back-EMF. Firstly, by detecting the zero-crossings of the 6th-harmonic back-EMF with/without eliminating the influence of the 3rd-harmonic...
This paper proposes a novel inductance estimation method based on a signal injection to improve a position error estimation performance of sensorless control by using a rotation matrix for interior permanent magnet synchronous motor. Using the rotation matrix method for estimating a rotor position error has advantages as wide estimation range and satisfy with linearity of the position error. However...
In this paper a combined position estimation approach for Switched Reluctance Machines (SRMs) using a signalinjection technique and a flux-linkage based method is presented. A second-order Kalman filter is used for smoothing the position as well as for providing the speed; this leads to a considerable reduction of the position error, especially in the vicinity of the speed for which the filter is...
Multirotor helicopters are expected to be utilized various tasks including rescue missions and surveillance. For those missions, sensors are equipped with helicopters in order to recognize the environment, and auditory information is one of such information that can be utilized to find the target sound source even if it is occluded by objects. One of the difficulty comes from the fact that the noise...
In this paper, a robust trajectory tracking control strategy for a quadrotor flying robot is developed. At first, the quadrotor's dynamic model is obtained by Euler — Newton approach. Then, control strategy, consist of a robust linear H∞ control to track transitional movements for reference trajectory and a robust nonlinear H∞ control for rotational movements and rejecting the external disturbances...
A new rotor flux linkage estimator based on sliding mode control (SMC) is proposed for vector controlled induction machine (IM) to improve the performance of the flux orientation and torque control for IM. The stator current and rotor flux sliding mode estimators were constructed in stator coordinate frame. Furthermore, the adjusting parameters for SMC are optimized to improve the estimation accuracy...
Using integrated sensors carried onboard a quadrotor unmanned aerial vehicle (UAV) can be used to wind field estimation through intelligent dynamic analysis, UAV control, and sensor management. The data from UAV on-board sensors such as GPS and inertial measurement units are utilized such that no dedicated sensors (i.e., pitot tube) for wind characterization are necessary. Using the estimated ground...
An attempt to record speech signals using an array of directional microphones carried by an unmanned aerial vehicle (UAV) is reported. The speech enhancement algorithm estimates the power spectral densities (PSD) of the target speech and rotor noise which are used to calculate a Wiener filter for extracting the target speech. The calculated Wiener filter is then applied to the output of a beamforming...
The motor speed of an induction machine can be accurately estimated by utilizing speed-dependent harmonics in the stator current. This paper presents a PLL-based approach to identify one of these harmonics and reduce bandwidth-limiting filtering operations. Experimental results show the ability for tracking dynamic speed transitions.
Dynamic State Estimation (DSE) is a critical tool for analysis, monitoring and planning of a power system. The concept of DSE involves designing state estimation with Extended Kalman Filter (EKF) or Unscented Kalman Filter (UKF) methods, which can be used by wide area monitoring to improve the stability of power system. State estimation with EKF and UKF methods can be used for monitoring and estimating...
Rapid technological advances in electronics, computers, software applications and the aerospace industry have dramatically decreased the cost of implementation while increasing the availability of Unmanned Aerial vehicles (UAVs). UAVs are those flying aircrafts that runs without an onboard pilot. They are controlled through a computer or remote. The main motive of this survey is to scrutinize theoretical...
In this paper, a novel high-frequency (HF) injection method of sensorless drive for doubly-fed induction machines (DFIM) is proposed. The high-frequency voltage is injected into the rotor winding and according to the concept of synchro, the rotor position can be simply extracted from the phase difference among the stator current and the rotor current regardless of machine and grid parameters. In addition,...
Thermal monitoring is a common feature in most of electric machine drives since thermal overloading is one of the most common causes of motor failures. Contact-type sensors are normally used to measure the stator temperature in electric machines. However, use of this type of sensor is not advisable in the rotor as it requires cabling to a rotating part or the use of a wireless transmission system...
In the field of permanent magnet synchronous motor (PMSM) self-sensing control, the initial rotor position estimation is always important, for which, the rotor magnetic polarity estimation is particularly a major task. This paper presents a robust rotor polarity estimation method based on the comprehensive utility of both magnetic saturation effect and rotor angular acceleration. The method can be...
The complexity of core loss estimation is an essential limitation for electric machine design engineers. It is critical to estimate the core losses and reduce them in the design stage to improve the machine efficiency. Current estimation methods based on the Steinmetz equation and loss separation are not accurate enough even at the rated conditions. This work describes a loss estimation technique...
The performance and life expectance of Permanent Magnet Synchronous Machines (PMSMs) is strongly affected by the PM temperature. An increase of the PM temperature reduces the PM strength and consequently the machine torque production capability. Also there is a risk of irreversible demagnetization if PM temperature is too high. Directly measurement of the PM temperature is not easy, PM temperature...
This paper investigates the modeling, simulation and implementation of sensorless maximum power point tracking (MPPT) of permanent magnet synchronous generator wind power system. A comprehensive portfolio of control schemes are discussed and verified by simulations and experiments. Particularly, a PMSG-based wind power emulation system has been developed based on two machine drive setups — one is...
This paper considers the possibility of adopting a conical shaped motor for Green Taxiing (GT) application. This topology of motor has been selected in order to obviate the presence of external declutching system (i.e. mechanical or electromagnetic clutch) interposed between the electric actuator and the wheel. An axial force contributes to move the rotor inside-out of the stator (principle of sliding-rotor)...
Aggressive maneuvers for micro unmanned aerial vehicle (MAV) require short settling time for attitude reference tracking and small overshoot for stabilization, which leads to the implementation of composite nonlinear feedback (CNF) control method. In this paper, an MAV platform is customized with all of the sub-systems designed to be small in size factor and simplified with their functionality. A...
This paper proposes a methodology to efficiently estimate the probability of small-disturbance rotor angle instability of uncertain power systems. Traditional Monte Carlo (MC) approaches are computationally intensive and inefficient, particularly when used to study low probability conditions which result in small disturbance instabilities and develop into serious outage events high impact. The proposed...
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