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The magnetic circuit of switched reluctance motor (SRM) is seriously nonlinear because certain parts of the stator and rotor may go into magnetic saturation and the mutual inductance will be large when the motor works at two-phase excitation. These factors make the control of winds current very difficult. This paper analyzed the inductance of 8/6 SRMs including mutual inductance. Then a novel current...
Consideration of the structure and the operation principle of Switched Reluctance Motor (SRM), it is possible to obtain super high speed drive. Therefore, a three-phase 6/2 SRM, the speed of which is 130,000 rpm, is adopted for super high speed drive. Based on the two-dimensional finite element method (FEM), the torque-angle characteristics of 6/2 SRM are analyzed and the motor structure is improved...
The current confluence of energy needs, enhanced environmental awareness and technical developments has led vigorous global efforts toward making wind power a key component of renewable and sustainable energy resources. The conventional wind generators are induction machine types having small and limited wind power production and high cost per unit. Large wind plants involving interior permanent magnet...
A brushless doubly-fed machine with tooth-harmonic wound rotor is a new type of BDFM. The machine is intended for use as a variable speed generator, or drive. Maximum torque output may be obtained by optimally dividing the overall magnetic loadings and electric loadings between the stator windings attending by reasonable rotor winding. This paper proposes an improved particle swarm optimization algorithm...
This paper presents the analysis method of a capacitor-run signal-phase induction motor behavior by using circuit-coupled two-dimensional finite element method. In order to analyze the machines accuracy under rotating magnetic fields, the voltage source, run-capacitor and slide boundary are considered. The voltage coupled model included slip boundary and calculation method is presented, and the simulation...
The synchronous generator model has important influence on analyzing of power system stability. The article introduces that how to build the fifth-order mathematical model of the synchronous generator by Park equation in the stand-alone infinite system firstly. Then the simulation model is built by using the modified Eulerpsilas method. Finally, it can prove that this fifth-order mathematical model...
Permanent magnetic gear (PMG) is a new kind of non-contact power transmission device which has unique advantages to be applied in the situations of airproof and small vibration requirements. A new kind of large torque permanent magnetic gear box with flexible transmission ratio is introduced in this paper. Research on principle analysis and transmission characteristics were carried out on the basis...
The objective of our research is to investigate the performance evaluation of traveling-wave ultrasonic motor with two-degree of freedom (2DOF-USM). The space structure of 2DOF-USM is introduced briefly. The mathematic model of the motor is established based on friction drive mechanism. Through relation of space location, calculating the driving force and friction force at arbitrary point of contact...
This paper mainly discusses several key technologies in high performance BLDCM. A brief summarization on present studies in the field of aviation and aerospace for the enhancement of reliability, efficiency and variable speed capability is given, and its research direction in the future also is looked ahead.
A permanent magnet dual mechanical port machine (DMPM) is a compact and pure electrical solution to the hybrid electric vehicle traction, which features as two independent rotors and permanent magnets mounted on the outer rotor. The key barrier prevent the DMPM from practical usage is the existence of the brush and slipring. A way to eliminate the brush and slipring is presented in this paper, which...
This paper presents the principle of a new rotor of Brushless Doubly-Fed Machine (BDFM) - the tooth harmonic wound rotor. The rotor could be easily coupled with both stator windings because of its high winding factor for both pole-pairs. Given the current of control winding, the harmonic analysis in space is presented. The result shows that some of the special harmonic waves, which deteriorate the...
The focus of this paper is to improve self-sensing performance of interior permanent magnet synchronous machine (IPMSM) by modifying rotor configurations. Field intensified IPMSM (FIIPMSM) is designed by adding flux barriers in the rotor of an IPMSM. In comparison with IPMSMs, FIIPMSMs have the advantage of decoupling saturation-induced saliency, cross-coupling effects and also secondary saliencies,...
The parameters of permanent magnet synchronous motors consists of flux leakage coefficient, direct-axis synchronous reactance, quadrature-axis synchronous reactance and the ratio of two synchronous reactance. They all can influence the performance of permanent magnet synchronous motor such as pullout torque, pull in torque and starting torque. The calculated accuracy of the parameters above mentioned...
Taking a two-pole high-speed permanent magnetic synchronous generator (PMSG) as an example, the mathematic and physical models with generator eccentric are established. This paper presented two different methods to calculate the magnetic field distribution and unilateral magnetic force (UMF) in the whole calculating region. And then analysis of influences of the eccentricity, load current and harmonics...
A combined method of stationary finite element method (FEM) and time-stepping FEM is proposed to calculate the pull out torque of line start permanent magnet motor accurately and efficiently. The power angle characteristic was obtained with stationary FEM, and then the critical step-out power angle and the field-circuit result corresponding to the critical condition can be acquired. On the basis of...
In this paper, a novel concept of repulsion velocity is adapted to original PSO. The concept of repulsive velocity is originated from the behavior to keep out of area which has low fitness. Proposed technique shows more improved convergence and reduces the number of function call compared to original PSO. The validness of the proposed algorithm is verified by an application to a test function.
In this paper, a study focus on cost reduction of magnet material by utilizing the structure advantage of rotor design in a single-phase line-start permanent magnet motor (LSPM) is presented. Base on a prototype LSPM having single-barrier rotor structure, a double-barrier IPM rotor design is adopted for saving the permanent magnet material and maintaining the main machine performances. The advantage...
Space-vector pulse width modulation (SVPWM) method have been wildly developed in direct torque control and vector control. The SVPWM is an excellent control strategy, but the relation between reference voltage and actual output voltage is nonlinear due to the dead time effect and the voltage drop of power devices. The distortion of voltage invokes serious problems such as current waveform distortion...
This paper deals with design criteria and characteristics analysis included electromagnetic losses analysis of a high-speed permanent magnet synchronous motor for a 7.5-kW, 60-krpm class centrifugal air compressor. In order to design this machine, we introduced analytical techniques, such as the electromagnetic transfer relations theorem and equivalent magnetic circuit method. And, from the curve-fitting...
The objective of this paper is to present a novel five phase fault tolerant doubly salient electromagnetic generator (DSEG) for direct driven wind turbine. The novel generator has same distinct features as follows: first, the generator configuration is simple and reliable. The output voltage is controlled by DC exciting current easily and the position sensors and the active power converters are not...
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