The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a new speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor (IPMSM) drive. Closed-loop control of both the torque and stator flux linkage are achieved by using two proportional-integral (PI) controllers. The reference voltage vectors are generated by a space vector modulation (SVM) unit. The drive uses an adaptive sliding mode observer for...
Switched reluctance motors (SRM) have gained more popularity in recent years because of their simple structure, low cost, high reliability, and high torque-to-mass ratio. However, the applications of the SRM have been limited because of their large torque ripple, which causes noise and vibration problems. In order to solve these problems, Ca novel direct torque control (DTC) methodology is directly...
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...
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...
This paper propose a control project using adaptive feedback linearization on the AC servo system. Theory derivation and computer simulation proved that the project can implement robust control of parameters and has the actual application value.
This paper presents the operational principles, design and transient analysis of a new three-phase 12/14-pole doubly salient electrical magnet (DSEM) generator for its application in direct-driven wind power generation. Design equations, finite element and dynamic analysis of the new generator are described. The 12/14-pole DSEM generator with constant self-inductance has lower voltage ripple compared...
This paper presents the result of the two-dimensional finite element analysis on the effects of rotor pole arc variation and number of teeth per rotor pole with different teeth depths and stator excitation pattern on various performance parameters like cogging torque, developed torque, harmonic torques, torque ripple and phase inductance for an 6/8, three phase flux reversal motor. A novel excitation...
The active and reactive components of the power winding current were controlled by the control winding current, which could make power winding current only providing active current component, and the power winding supplying the dynamic torque. The exciting field for the power winding was completely provided by the control winding. On the basis of dq-rotating reference frame of brushless doubly-fed...
This paper proposes a mathematic nonlinear model of phase flux linkage in terms of Fourier series expression and a phase torque model based on adaptive neural fuzzy inference system (ANFIS) to a 6/4 switched reluctance motor(SRM). The novel model for SRM and the switched reluctance drive system based on Matlab/simulink is developed. The various control strategies, such as the chopped current control...
This paper presents the dynamic modeling, prediction, control and experimental aspects of a switched reluctance starter/generator (SRS/G) system. The proposed model utilizes the Fourier series in expression of current dependent arctangent function to characterize the relationship among phase current, rotor position, flux linkage and torque characteristics. Second, a simulation model along with their...
Compared with the conventional short-pitched winding switched reluctance machine, the fully-pitched winding machine can far better utilize the electric circuit. Due to the differences in principles of between motoring operation and generating operation regarding to the fully-pitched winding switched reluctance machine, this paper will propose a novel control strategy of generating operation of a three-phase...
Switched reluctance motors are often running in status of two phases excited simultaneously. Mutual coupling has effects on not only the flux distribution and magnetic saturation, but also the ability of torque output. The two adjacent phases of switched reluctance motor can be excited in two modes, the long-flux-path mode and short-flux-path mode. The calculation method of mutual inductance in two-phase...
After introduced several common hybrid systems, the article gives out a new hybrid system typology which uses a dual rotor machine as an electrical variable transmission. The article briefly introduces the basic working principles of the machine, then analysis the mathematical model of a novel machine in the outer rotor synchronous reference frame, it gives out the equivalent circuit as well. According...
The paper presents a direct-torque-control scheme for a direct drive variable-speed permanent magnet synchronous generator (PMSG) for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of PMSG according to the generator speed. Fixed switching frequency and very low torque ripple are obtained with...
Most dynamic characteristics analyses of magnetic bearing are based on the simplified mathematic model neglecting the non-linear electromagnetic relationship between the stator and rotor. This paper presents a detailed analysis and experimental study on the dynamic characteristics of magnetic bearings for a high speed permanent magnet motor. The analysis based on field-circuit coupling method can...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
Accurate information of rotor permanent magnet field is needed in permanent magnet synchronous motor(PMSM) control, but this information is variable under demagnetization conditions, such as high temperature or peak current. Nonsinusoidal flux density distribution caused by demagnetization induces to torque ripple, which degrades the PMSM drive performance. To estimate flux magnitude, a Kalman filter...
Generally, a back electro-motive-force or flux observer is used for position sensorless drive of permanent magnet synchronous motors from middle to high speed range. Thus, the estimation accuracy of the observer influences position sensorless drive performance. This paper proposes a position sensorless drive system using the Hinfin flux observer in which the observer gain is designed by using the...
A sensorlesss vector control system of PMSM compressor is presented in this paper. By calculating the magnetic flux linkage, the position of magnetic pole and the speed of the compressor are estimated. To realize the low cost sensorless control, an 8-bit high performance microcontroller-XC886 is used. Phase currents measurement based on shunt resistors in lower legs is adopted to simplify the circuit...
Method for 3D dynamic finite element analysis of electromagnetic problems involving movement was presented, in which the external circuits, nonlinear magnetic properties, eddy-current effects and movement are taken into account. In the method, the problem of voltage excitation problem was solved by the field-circuit directly coupled technique, and the 3D electromagnetic torque was calculated through...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.