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This paper describes the experimental study of a synchronous magnetoelectric generator which magnetic system is based on the asynchronous motor: the stator of magnetoelectric generator is made up of induction machine with a number of poles pairs 2p=12, a cylindrical inductor (rotor) is composed of permanent magnets distributed on the rotor surface. The modeling of magnetic system was carried out using...
The objective of the paper is to identify a power prediction method suitable to horizontal axis hydrokinetic turbines using simulation, laboratory testing and operational data collected from literature. An open source framework for the simulation and design is used in order to determine the optimal design of the blade geometry for small rotor models which are then tested in a dedicated experimental...
The paper presents a prototype of a high-speed Switched Reluctance Motor designed for power tools and results of simulations of the control system of this motor. The basic aims of the simulation was to determine the efficient control of the motor phases and to determine the electromagnetic torque ripple. Simulations have shown the necessity of modifying the drive control algorithm to reduce the amount...
This paper presents a design and control of the rail mover system for the security system of the wide area. The rail mover is driven by the geared BLDC(Brushless DC) motor on the rail surface. The position of the rail mover body has to be controlled at the correct position during the running on the rail surface. In this paper, the BLDC motor with hall sensor is used to control of the position. Because...
This paper proposes the use of an active yaw system to protect small and medium wind turbines in the high wind zone from overloading. The active yaw system turns the rotor partially out of the wind to decrease the turbine power. The dependency of the power on the yaw angle is modeled by the third power of the cosine of the yaw angle. A proper controller is configured based on on-off control of the...
This paper presents a sensorless control strategy for the surface-mounted permanent magnet synchronous motors (SPMSMs) with a sliding mode controller (SMC). To extract accurate rotor position from the back electromotive force (EMF) of the SPMSM, a tangent function-based phase-locked loop (PLL) is established. Without extra tuning of parameters, the position estimation scheme manages to provide accurate...
A novel design of Composite Turbo-Molecular Pump (CTMP) is proposed. The major configuration of CTMP is composed by a coarse pump, a Turbo-Molecular Pump (TMP) and a Magnetic Gear Unit (MGU) capable of speed amplification. The corresponding modal analysis and the study on rotor/bearing dynamics are undertaken at first to estimate the resonance frequencies of the TMP blade rotor itself solely and the...
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...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
This paper deals with the reliability of today's induction machines. The fault tree analysis is presented including the most important parts of the machine, whereas the bearings are emphasized within this paper. The general focus is set on data acquisition, their analysis, and the resulting statistics which finally allow to derive tendencies and perspectives regarding the reliability of induction...
The rotor position estimation and the speed control for drives of the ceiling fan motor (an outer-rotor permanent magnet synchronous motor) are studied in this paper. Then, the implementation of the aforementioned estimator and control algorithm using FPGA (Field Programmable Gate Array) is proposed. In the aspect of the rotor speed control, an I-ƒ start-up strategy is applied when the motor runs...
Multi-agent pursuit-evasion games are a common way to describe problems in topics like police missions, surveillance, or warfare. Since many agents are involved in such problems, a game-theoretical solution seems reasonable. Game-theoretical solution approaches are generally very complex, especially in games with more than two agents, as it is the case in this paper. More and more unmanned aerial...
Recent developments in electrical drive systems have shown a trend toward higher power densities at increased rotational speeds with application areas in high speed spindles, turbocompressors, flywheels and reaction wheels as well as optical systems. As conventional ball bearings suffer from excessive wear and decreased reliability at such speeds, contactless magnetic levitation offers an interesting...
Oil film bearings have high load capacity and large damping. However, at high rotational speeds, fluid forces in the bearings, such as oil whip or oil whirl, can induce self-excited vibrations in the rotor. A hybrid system consisting of oil film bearings and a bearingless motor (BLM) is one of the possible ways in which a heavy rotor can be supported and rotated at high speed without inducing self-excited...
This paper presents a rotational speed measurement system based on a low-cost imaging device with a simple marker on the rotor. Structural similarity and two-dimensional correlation algorithms are deployed to process the images. The measurement principle, structure design and performance assessment of the proposed system are presented and discussed. The effects of different markers, image processing...
This paper introduces the adaptive bias and adaptive gain (ABAG) algorithm for closed-loop electronic speed control (ESC) of the brushless direct current (BLDC) motors typically used to spin the propellers in multi-rotor aerial robots. The ABAG algorithm is adaptive and robust in the sense that it does not require the knowledge of any mechanical/electrical parameter of the motor/propeller group and...
This paper presents a speed control for a DC motor. Despite the unknown parameters of the plant to be controlled, these parameters are found using a system identification method. The methodology implemented in this study is known as parametric regression and is based on an optimization technique. This optimization, through its fitness function, allows to find the system characteristics in order to...
In this paper, we propose a vector control of a doubly fed induction generator (DFIG) for variable speed wind power generation. The model is developed based on the dual powered generator for the control of the active and reactive powers. Several studies are carried out to test their operation under different wind conditions. The results have shown good performances of the wind energy converter system...
A novel control method to reduce oscillations for three-phase stepper motors and to improve dynamics using a speed control with feed forward technique is proposed. The new concept uses a transformation of the model to allow a linear design of the observer and control, reducing so the real time calculations. Furthermore the stability of the nonlinear process is guaranteed with the optimal choice of...
Noise and vibration of electrical machines are a major concern for applications where comfort is a significant aspect. There are several faults that may arise in machines increasing noise and vibration. Cogging is one of the main faults in Permanent Magnet Synchronous Machines (PMSMs). Tools for the diagnosis of cogging are needed to detect the machines that do not fulfil the quality requirements...
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