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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...
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...
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...
This paper presents the design approach of a power train used in an advanced high-lift system for future aircraft. Aircraft applications require an ultra-light and integrated design leading to an electrical machine with a high power to weight ratio of 2.82 kW/kg. To achieve additional high lift during take-off and landing, air is blown out at the back flaps of the aircraft wings using a turbo compressor...
Induction motor is an electric motor which has many advantages. One of them is robust and relatively cheap. But has some disadvantages in the regulation of speed, because of that, the system need smart control to operated the induction motor. in this case used Backstepping control as intelligent control to maximize the performance of induction motor. In this method Indirect Field Oriented Control...
The main objective is to study dynamic behavior of hydro generator at variable excitation. This paper presents analysis of the dynamic behavior of a hydroelectric power plant including hydraulic system, electrical installations, rotating inertia and control systems. First, the modeling of the electrical and hydraulic systems is described. The electrical system is constituted by a salient-pole synchronous...
In this paper, the optimal speed control, based on Linear Quadratic Regulator (LQR) theory, through stator field orientation (SFO) of an inverter fed induction motor is addressed. The voltage source inverter, behaving as an actuator, is operated using space vector pulse width modulation (SVPWM) technique. The state feedback system is augmented with integral output error to enhance reference tracking...
In wind farms, rotor speed control of generator is essential to generate appropriate electric energy. In this study, squirrel cage induction generator (SCIG) is used and its rotor speed is controlled with Genetic Proportional-Integral (GPI) method. Determination of PI coefficients providing SCIG to operate reference rotor speed promptly is obtained with Genetic Algorithm (GA) known as an optimization...
In this paper the Fault Tolerant (FTC) vector controlled induction motor drive system (Direct Torque Control — DTC-SVM) is described and tested during different drive conditions. Influence of the incremental rotor speed sensor faults to the properties of the analyzed drive is tested. Faults detection algorithm is developed and presented. The control structure is modified by adaptive system in the...
In order to compare braking performance of dual torus hydrodynamic retarderwith different blades, the braking performances of dual torus hydrodynamic retarder with the bowed blade and different angle straight blades are calculated. The internal flow fields of different blade hydrodynamic retarder are numerically simulated by computational fluid dynamics (CFD) method. The braking torque, the distribution...
The paper discussed several designed variants of TFG with different number of poles, speed and dimensional coefficients starting from two base module variants with a rated power of 8kW and 11 kW respectively. The proposed layout came from reluctance one and it is suitable to equipped stand-alone electric power plant being a proper solution for isolated farms. The influence of large number of poles...
The speed control of electric machines employed in automotive electrical traction drives is a challenging problem. Indeed, these applications are subject to physical and computational constraints. This paper addresses this challenging problem by employing a multi-rate predictive cascade state-space control structure, focusing on the design of the outer loop controller. Firstly, the mathematical model...
Magnetic bearings can support a floater (rotor) without mechanical contacts in rotating machinery systems. Since the rotors can be supported by magnetic bearings without mechanical contacts, some merits are expected. For example, (1) there are no friction and wear, (2) the system can be operated at higher rotational speeds than bearing systems with mechanical contacts, (3) vibration and noise can...
This paper presents the study of a multi-pole exterior-rotor permanent magnet synchronous machine as a part of a hybrid drive for a small unmanned aircraft. The electric machine is designed to operate in generator or motor mode. Gramme's winding is used in the construction of the analysed machine. The paper covers the load test analysis of the electric machine in generator mode. Motor mode tests are...
This work proposes a new control scheme for electrical drives system, named cascaded predictive speed control (PSC). The strategy seeks to maintain the simplicity of the classic predictive control while excluding linear or other controllers. The control strategy has a cascade architecture, similar to the techniques of classical control (FOC or DTC). The outer loop controls the speed of the machine,...
The speed control problem of permanent magnet synchronous machine drives is a challenging problem which has to deal with physical and computational constraints. Moreover, the speed control has to provide also the references of the stator currents. The goal of this paper is to develop an effective control methodology for speed control in permanent magnet synchronous machine drives using a two step...
This paper focuses on the low speed performance of extended electromotive force (EMF) based position-sensorless speed control of surface permanent magnet synchronous motors (SPMSMs) in real-time. It is the first time Morimoto's extended EMF approach is applied to SPMSM and its low speed performance is evaluated by real-time experiments. The results obtained from the designed position-sensorless drive...
We present the performance of a micro ultrasonic motor using a stator with a volume of approximately one cubic millimeter, which is one of the smallest ultrasonic motors. The stator consists of a metallic cube with through-hole, a rotor shaft is inserted to the hole, and piezoelectric elements adhered to its four sides. When voltages are applied to the piezoelectric elements, the stator generates...
The paper deals with the fault tolerant Direct Torque Control of an induction motor drive. Influence of the speed sensor faults to the properties of the DTC-SVM drive system is presented. Control structure with and without outer speed control loop is analyzed. Simple algorithmic mechanism of the speed sensor fault detection is described. During the faulted conditions vector controlled drive is switched...
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