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This paper describes a generalized method to develop steady state model (SSM) of different electric motors comprising electric equivalent circuit (EEC) and the torque equation. In most of the books on electric motors, EEC is used to explain operation and performance characteristics of motors, but the development of these EECs is not explained convincingly. This work overcomes this shortcoming by specifically...
This paper presents an improved position-sensorless field-oriented control strategy for a surface-mount permanent magnet synchronous motor (PMSM). In this algorithm, a high-pass filter (HPF) has been applied to the rotor flux estimation to solve the DC drift or offset problem caused by the integration part. The rotor position and speed signal extraction is achieved by mean of a phase-lock loop (PLL)...
This paper proposes a combined parameter estimation for permanent magnet synchronous machines (PMSMs), by which the rotor permanent magnet (PM) flux linkage and mechanical parameters such as the combined moment of inertia and viscous friction coefficient are estimated without the aid from nominal machine parameter values. The proposed estimation of rotor PM flux linkage is based on the addition of...
This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
A novel dynamic decoupling control method based on Linear Extended State Observer(LESO) for attitude stabilization of coaxial tri-rotor UAV is presented. Coaxial tri-rotor UAV system is a strong coupling, susceptible to disturbance, and multi-input multi-output (MIMO) system. High performance stabilization of such UAV is effected by virous uncertainties and disturbances which are difficult to measure...
The spindle motor in machine tool mostly adopt induction motor. In order to achieve dynamic control of the magnetic field and torque, one needs to estimate the synchronous induction motor electrical angle. The calculation is based on the basis of the rotor time constant. The accuracy of the parameter measurements will affect the performance significantly. How to improve the spindle motor torque is...
In this paper, we proposed “half-wave rectified brushless synchronous generator” using a half-wave rectification excitation system, and we analyze of the basic characteristics by the finite element method.
The efficiency concept becomes present at all levels of electric motors design, manufacturing and repairing activity. New legislations including Energy Independence Security Act and similar will effectively impose a new design constraint: efficiency of induction machines (IM). Various motor management programs promoted by the utilities, new standards will also closely monitor efficiency of the repaired...
The efficiency concept becomes present at all levels of electric motors design, manufacturing and repairing activity. New legislations including Energy Independence Security Act and similar will effectively impose a new design constraint: efficiency of induction machines (IM). Various motor management programs promoted by the utilities, new standards will also closely monitor efficiency of the repaired...
The paper deals with a synchronous motor control design. The field oriented control is assumed and it is suited for synchronous motor with permanent magnets. Current and voltage limitations are taken into account therefore a field weakening is used for reach high speed range with a most possible torque. A whole problem is solved using simulations in PC. Mathematical model of the synchronous motor...
Fault diagnosis involves the detection, location and identification of faults. The objective of this work is detection of faults in a synchronous generator (SG) using the parity space approach. The method is based on building the fault indicators using analytical redundancy relationships. The proposed technique is successfully applied for external fault diagnosis of a 4-pole, 60-Hz, 208-V, 1.5-kVA...
The basic function of any type of electric machine used in automotive powertrain is to propel the automobile in motor mode or to recharge the high-voltage battery in generator mode. The torque control of electric machine in motor and generator modes, using more efficient high-voltage battery, is a goal for automotive industry. The entire control structure must be designed so as to take into account...
In order to solve the torque ripple, a novel direct torque control (DTC) scheme for permanent magnet linear synchronous machine (PMLSM) based on adaptive fuzzy control is proposed in this paper. The proposed control method uses the long stator flux amplitude and the electromagnetic torque errors through an adaptive fuzzy inference system to act on both the amplitude and the angle of the desired reference...
Today, in modern three-phase inverter based AC drive systems for electric and hybrid electric vehicles a trend to high voltage levels can be observed. An increase of voltage at constantly leaved power level inherently leads to lower currents in the inverter and in the motor compared with low voltage based drive systems.
This paper presents a novel approach for measuring the differential inductances in a permanent magnet synchronous machine (PMSM). The knowledge of their accurate values is a prerequisite for sensorless vector controlled systems with carrier signal injection. For the measurements a standard industrial power converter is used. Besides the determination of self-inductances in the rotor-fixed reference...
In case of three-phase short circuit fault occurring at the terminal of a doubly-fed induction generator (DFIG), the rotor current characters of DFIG are analyzed from the viewpoint of the flux linkage, and the expression of the rotor current is deduced together with the estimated expression of the maximum rotor current. Based on above analysis, the max rotor currents and their appearing times with...
The mass imbalance often cause the vibration of high-speed rotation machinery in actual use. And it's the most common cause of the malfunction. Based on the theory of rotor dynamics, we can diagnose the failure and its causes more accurately by applying the software to doing simulation analysis of characteristics of rotor dynamic. Moreover, it provides reliable basis for the further solutions to the...
The dynamic behavior of the rotor-bearing system of the slider-crank mechanism was studied in this paper. Based on the finite element method, a model of the rotor-bearing system was developed. The calculation results of the numerical simulation demonstrated that dynamic response of the shaft depended on both the bearing stiffness and the dynamic property of the slider-crank such as rotor rotate speed.
There was a major collection of publications between 1975 and 1985 that established fundamental theory and implementation of power system dynamic analysis. These results recognized the time-scale features of power systems and created strong modeling and analysis tools that are continuing to form the basis for simulation and analysis techniques today. This paper presents the fundamental time-scale...
Adaptive inverse control (AIC) theory is introduced to inhibit interferences such as side wind during hovering control for small-sized unmanned helicopter. Based on this theory, an AIC control block diagram is improved to accommodate with the characteristics of helicopter hovering model and robust design. According to structure and fundamental theory of small-sized unmanned helicopter, a hover flight...
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