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A novel control algorithm, one-cycle control, was adopted in five-phase six-leg switching power amplifiers for magnetic bearing. Mathematical models of current ripple were derived, from which methods to reduce the current ripple is obtained. Simulation and experiments were conducted on for different parameters. The results were compared with bipolar and unipolar one-cycle control, which agrees with...
For the permanent magnet (PM) machine, 180 degree commutation method can reduce the switching frequency and increase the voltage utilization, which is suitable for high speed operation. However, higher speed operation needs more precise position sensor which is relatively expensive. To increase the reliability and reduce the cost, a new sensorless control method is proposed for the PM machine with...
In conventional bearingless switched reluctance motors (BSRMs), the current control algorithm is quite complex due to the coupling between torque and levitation forces. In this paper, a 12/4 dual-winding BSRM is proposed, which can realize decoupling control of torque and levitation forces. Because of the special inductance profile and two windings mounted on the stator pole, the torque and levitation...
When one winding of the single-winding bearingless switched reluctance motor (SWBSRM) is short-circuited, a continuous radial force for the levitation can be obtained by extending the conduction of the prior energized phase. Based on the force compensation strategy, this paper aims to further improve the fault-tolerant ability of the motor. Optimized fault-tolerant current mathematical model is proposed...
Open-winding permanent magnet (PM) generator power system is an important research direction of wind power. Compared with rotor-PM motor, flux-switching permanent magnet (FSPM) machines have the advantage that is suitable for flux-weakening operation and has no risk of PM demagnetization. Hence, FSPM machine is applied to the open-winding power system in this paper and six topologies of FSPM machines...
In order to avoid the limitation of the mathematical model of single-winding bearingless switched reluctance motor (SWBSRM) in the single-phase excitation mode, a new model considering two-phase coupling is proposed in this paper which is suitable for both single- and two-phase excitation. Firstly, the inductance matrix is developed based on the magnetic equivalent circuit considering two-phase coupling...
In order to improve the reliability of the Bearingless Switched Reluctance Motor (BSRM), this paper develops the mathematical model and compensation control of radial forces for the 12/8 dual-winding BSRM when a levitation winding is short-circuited. Firstly, based on the normal mathematical model of BSRM, short-circuit current model is derived and radial force model with short-circuit fault is also...
The Intelligent control methods are drawing great attentions due to their strong adaptive ability and learning ability. Because of strongly nonlinear magnetic characteristics of switched reluctance motor(SRM), modeling of the torque characteristics is difficult. In this paper, the new torque modeling approach based on artificial neural network(ANN) is investigated, where the training data are obtained...
Accurate modeling of flux-linkage characteristics is the basis of design and control of switched reluctance motor (SRM). The flux-linkage characteristic of SRM is a function of both the excitation current and rotor position. But due to the highly nonlinear characteristics of SRM, modeling is cumbersome. In this paper, three effective algorithms for modeling of SRM are investigated, which are based...
A bearingless switched reluctance generator (BSRG) is developed, which is operated in full-period generating mode. In the proposed 12/8 bearingless generator, two sets of windings are embedded in the stator. The coils of excitation winding wound on each stator pole are separately controlled, whereas the coils of generation winding are connected in series for each phase. To begin with, the voltage...
Accurate calculation of the flux linkage characteristics is the basis of design and control of bearingless switched reluctance motor (BSRM). In this paper, flux linkage of main-and suspended windings for a BSRM were calculated by using 3D finite element method (FEM). A new subregional fitting algorithm was proposed and a novel mathematical model of flux linkage was built by using Fourier series and...
This paper presents a method of optimizing number of turns of the main and radial force winding for a bearingless switched reluctance motor (BSRM) with 12/8 teeth configuration based on its mathematical model. The radial force and torque of BSRM are analyzed on condition of different combinations of the magnetomotive force of two kinds of windings. The winding configuration has a strongly influence...
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