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The fundamental positive and negative sequence components of the voltage and current are always characters in induction machine stator fault diagnosis. This paper presents the application of the Pronypsilas method for deriving these components from the measured data. It is known that the Pronypsilas method is sensitive to noise and takes a long computation time by increasing of the length of the data...
The doubly-fed induction generator (DFIG) based wind turbines of today are often equipped with a crowbar, which can be used to limit the inrush rotor current and protect the ac excitation converter from damage via a set of resistors that are connected to the rotor windings of the DFIG. When the rotor current becomes too high due to the severe grid voltage dips on the transmission line, the crowbar...
Adding visualization function can facilitate the motor designer a lot in the CAD of small- and mid-type asynchronous electrical machinery. And so does it in visualization of design with the aid of the improvement of computer hardware and advancement of senior programming language. This paper talks about meaning of visualization of stator, rotor lamination and winding, as well as the programming method...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
Several types of interior permanent magnet synchronous motor have been utilized in the wide rage of applications. The characteristics of their cogging torque and average torque and d and q- axis inductance were clarified for the different shapes of rotor magnet and two types of stator windings. This paper clarifies the characteristics of radial attractive force and vibration for the different shapes...
The V/F controlled induction motor driver systems always suffer from middle frequency oscillations under light load conditions. Many methods were sponsored but always complex and parameters dependent. This paper present one simple and reliable method which can improve the systemspsila stability: First, one efficient dead-time compensating method was present, which can reduce the distortion of phase...
In order to measure accurately rotor flux, easily and simply estimate rotor speed for induction motor, this paper proposed a rotor flux observer based on a novel voltage model, and an original sensorless control method based on the phase difference between the stator current vector and the stator voltage vector. A novel voltage model was constructed, and then the rotor flux observer was established...
In this paper, a speed estimation and control strategy for induction motor drive based on an indirect field-oriented control is presented. The rotor speed estimator based on a RBF neural network utilizes stator voltage and current measured values to calculate the rotor speed, and the control approach based on a sliding-mode controller with an integral sliding surface is proposed in order to regulate...
Equivalent circuit parameters of doubly fed induction generator (DFIG) play an important role in the estimation of steady state and dynamic performance of wind turbine system. A new method based on magnetic field finite element analysis is proposed to improve the calculation of the DFIG parameters, especially the inductances. The magnetic field excited by the stator or rotor current is exactly divided...
Single-sided linear induction motor (SLIM) has many advantages, such as simple structure, easy maintenance, less environmental pollution and direct drive without the translation of mechanisms etc. However, longitudinal end effect deteriorates the performance because of the discontinuous magnetic circuit in SLIM. In this paper, the 2-D transient electromagnetic field of SLIM is computed using finite...
Toroidal motor is a new-style electric machine. In this paper, the basic principle of the motor is introduced. The forming and controlling of the rotational magnetic field are explained. The worm coil distributions for the motor are investigated. Based on the coordinate transforming principle, equations of the stator and the center curve for the worm groove are deduced and the 3D worm and stator models...
According to the torque-speed characteristic of permanent magnet double-rotor machine, the loss has been analyzed. Combining with structure and distribution of heat source of the machine and its cooling system, a lumped parameter thermal model has been formed to simulate analysis and verify thermal design for the adjustment of key design variables.
Three Degree-of-Freedom (3DOF) traveling wave type ultrasonic motor (USM) can move at three degrees. The principle and basic structure of 3DOF traveling-wave type USM are presented in this paper firstly. Then through coordinate conversion the distribution of the force on the contact area of rotor and stators can be obtained when the rotor rotates. Thus the motorpsilas driving and friction force can...
In Part II a comparative analysis of the different brushless PM motor configurations, including exterior and interior rotor arrangements, salient and non-salient surface-mounted PM rotors, concentrated and distributed armature windings is presented. The comparative study is based on the developed design methodology given in the Part I of this paper. These motor configurations are investigated to be...
A concept design approach for the brushless PM traction motor, which has crucial constraints on volume envelope and on the drive, is presented. The considered motor drive is the three-phase DC/AC converter, which is commercially available on the modern market of the standard variable frequency drives. The features of the motor design procedure, which are imposed by the peculiarities of an automotive...
This paper proposes a novel doubly salient machine. The topology of the machine is described. The flux within the air gap of the novel doubly salient machine is excited by both permanent magnets and field coils. The current of the field coils can be regulated to strengthen or weaken the flux level in the air gap. Therefore, the output voltage of the machine can be controlled easily. The method of...
To solve the low efficiency of electric excitation claw-pole synchronous generator (EECSG) and the challenges to regulate the magnetic field of permanent magnet (PM) claw-pole synchronous generator, a novel hybrid excitation claw-pole synchronous generator (HCPSG) with magnetic circuit series connection was proposed in this paper. Through the simulative study to the generator using the calculation...
This paper explores the global performances of doubly-fed asynchronous machines for different specifications: motor and/or generator operation, different torque-speed characteristics of the mechanical load or the prime mover. Simplified models of the active and reactive power balance are used to illustrate the capabilities of such a drive system. The DFAM synchronous speed selection is included in...
The compensated pulsed alternator (CPA) has high energy density and high power density, and can supply repetitive pulse, which can be used as a power supply for a variety of fields including laser and electromagnetic launchers. There are two stages for the operation of the CPA: self-excitation and discharging. It needs to generate an adequate current in the exciting windings as to supply a very large...
The double revolving-field theory is found not to comply with the superposition principle of magnetic fields. A vector expression is proposed to describe the single traveling field wave formed in air-gap by pulsating fields produced by stator windings.
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