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In this paper, a novel 12/14 bearingless switched reluctance motor (BLSRM) with a biased permanent magnet is presented. For this novel 12/14 BLSRM structure, the torque control can be naturally decoupled from the levitation force control according to the principle of the BLSRM. Based on the novel structure, a control system is designed to verify the performance of the proposed BLSRM. On the basis...
This paper mainly studies the speed control for a permanent magnet synchronous motor (PMSM) system with parameters uncertainties and torque change. PMSM is a typical nonlinear multivariable coupled system, and is sensitive to the load disturbance and the changing of motor parameters. Hence, the drive performance of PMSM is deteriorated when faced with all kinds of disturbances. A new control algorithm...
An analytical model based on subdomain model method is proposed for surface-mounted permanent magnet synchronous machine (SMPMSM) with radial and parallel magnetized eccentric magnetic pole. Further back-EMF, cogging torque and electromagnetic torque is calculated by using this model. This method provides a useful tool to mathematically illustrate the magnets with different circumferential thickness...
This paper presents the online identification method for interior permanent-magnet synchronous motor (IPMSM) drive system with the maximum torque per ampere (MTPA). The inductances of the motor are identified by recursive least square (RLS) method based on mathematical model, considering the flux saturation state. Using this technique, the improvement of the MTPA trajectory for IPMSM can be implemented...
Usually, SRMs are operated in discontinuous conduction mode (DCM), in which the phase winding is fully demagnetized to zero current before starting the next excitation. In CCM, the dwell angle is set so large that the phase current flows continuously and it results in a higher torque production. However, the behaviors of SRMs in CCM are highly nonlinear and it is difficult to predict the torque output...
Applications of switched reluctance motors (SRMs) are limited due to their high torque ripple that caused by the doubly salient motor structure and unbalanced electromagnetic torque. In this paper, two methods are presented to eliminate the torque ripple, including direct torque control (DTC) method and torque sharing function (TSF) strategy. The fundamental theories of the two control schemes are...
Due to the execution delay of the control signal caused by digital controller, there is one sampling time delay between the required optimal switching state and the executed switching state under the conventional model predictive controlled (MPC) systems, which lowers the system performance. In this paper, a two-step model predictive control (TS-MPC) strategy is proposed for a dual induction motor...
This paper presents the mathematical model of dual-stator-winding induction generator (DWIG) for aircraft variable frequency ac generating system under asymmetric operation. Firstly, the asymmetric mathematical model of DWIG under the A-B-C three-phase static coordinate system is built. Then, for the asymmetric operation, the zero-axis component is considered, and the asymmetric mathematical model...
The permanent magnet synchronous motor which has permanent magnet instead of field winding in the rotor has especially higher efficiency and torque per weight than other types of motor. When the irreversible demagnetization is occurred, users can be exposed to high risk of accident by the fault operation of motor. Because of this, the irreversible demagnetization of permanent magnet should be detected...
The external rotor permanent magnet motor has large air gap area, which can get high output torque. In order to reduce the stator core loss and the magnet eddy-current loss caused by high harmonic wave in the air-gap flux, in this paper a new kind of Halbach array form has been presented to achieve more sinusoidal air gap flux wave. Firstly, the optimal Halbach array form of m=3 was obtained by analytic...
This is paper on traction motor design for a Tram-Train which takes into consideration of a permanent magnet scattering. A Tram-Train is a railway vehicle that runs at the maximum speed of 70km/h in downtown area and at the maximum speed of 150km/h in-between cities. For this reason, a Tram-Train has characteristics of a wide variable speed area, requiring a traction motor design that is appropriate...
A new dual 3-phase flux-switching permanent magnet (FSPM) machine having 12/11-stator/rotor-pole is proposed and analyzed in this paper. Compared with the conventional 12/11-pole 3-phase FSPM machine, it is analytically deduced that the proposed dual 3-phase machine has better torque characteristics, i.e. higher torque density due to larger distribution factor and smaller torque ripple due to 30 electrical...
The foremost requirement of todays electric vehicle is comfort and power. The challenge that todays electric motor designer face is to have a large traction torque at low speed and wide constant power speed range. Flux switching machine has magnets parallel to stator winding that avoids the risk of demagnetisation because of better thermal cooling. Efficiency map of such machines can be determined...
In these days, importance of motor increase, As increasing of importance, there are many studies on increasing accuracy of controlling motor. Torque ripple is disturbance of torque control. There are many ways to reduce torque ripple and Skew analysis is widely used. This paper shows how to modeling Skew rotor and torque result of skew rotor.
The mechanical structure of the 2-phase 4/3 switched reluctance motor (SRM) with a non-uniform air gap make it suitable for unidirectional rotation applications such as air-blower. The non-uniform air gap is applied on the rotor shape to increase the positive torque region, and makes the motor can be operated at any rotor position without torque dead-zone. The 4/3 SRM is employed 4-stator and 3-rotor...
This paper presents performance evaluation as grid connected induction generator (IG) system has attracted great interest in DC-Link using battery and photovoltaic (PV) panel. In the single-phase utility grid connect power maximum from three-phases operating on single-phase induction generator there is the necessity. System can meet the requirement for constant DC-Link voltage of the wind turbine...
The paper proposes a novel dual-redundancy permanent magnet synchronous motor(DRPMSM) with low thermal coupling and non-electromagnetic coupling between windings of different phases which is sufficient in a range of safety-critical applications. Considering the serious consequences, three-phase short circuit is analyzed in detail and characteristics of short-circuit current and corresponding braking...
The 10poles-12slots brushless DC motor is superior as AC servo motor by sine-wave excitation, but its characteristics like efficiency get worse by using as BLDC motor by square-wave excitation. However, 150 degree excitation which adjusted excitation angle and excitation phase can increase 3% of efficiency from general 120 degree excitation, and it can make phase current similar to sine wave. And...
This paper presents a drive system of asymmetrical two — phase induction motors (TPIMS), which is able to operate in four quadrants. A front end converter connected with grid allows bidirectional power flow for rectification and inversion modes based on vector control to keep dc link voltage constant. A machine side converter uses a three — leg voltage source inverter based on a space vector pulse...
This paper describes an interior permanent magnet synchronous motor (IPMSM) employing ferrite magnets instead of rare earth magnets that can be driven at high speeds. Neodymium and dysprosium are raw materials of rare earth magnets used in IPMSM, and the prices of these materials rose until recently. Although the prices are stable at present, the use of high performance rare earth magnets is increasing...
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