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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...
To satisfy the requirement of the low speed high torque permanent magnet synchronous motor (PMSM) used in the precise numerical control (NC) rotary table, the multipolar PMSM with similar pole number and slot number and unequal teeth structure is designed in this paper. This kind of motors can operate with lower speed, and the structure of similar pole number and slot number can reduce its inherent...
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...
This paper deals with temperature calculation using equivalent thermal network in interior permanent magnet synchronous motor (IPMSM) under the steady-state condition. The equivalent thermal network consists of heat sources, which are generated from copper loss and iron loss, and thermal resistances considering conduction and convection. The heat transfer coefficient in conduction is decided by material...
This paper deals with the core loss reduction according to the change of stator shape in an interior permanent magnet synchronous motor (IPMSM). The number of slots per pole per phase of the IPMSM is 0.5, and the tooth width and yoke thickness are chosen as design factors. According to the ratio of tooth width and yoke thickness, the core loss is analyzed under considering the rotating and alternating...
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...
In the model reference adaptive system (MRAS) implemented in the two-axis stationary reference frame, the convergence performance is poor due to the cross feedback relationship between the alpha-axis component and beta-axis component of the rotor flux when the discrete-time calculation is operated. In this paper, a MRAS implemented in the synchronous rotating reference frame is proposed to identify...
In a three-phase PWM voltage-source inverter, there have voltage losses that cannot be neglected between the reference voltage and the actual output voltage due to the dead time effect. The distortion of voltage leads to serious problems such as current waveform distortion and torque oscillation of motor driving systems. In this paper, an improved method which effective reduces the losses of voltage...
A flux linkage estimation method for induction motor based on extended Kalman filter theory (EKF) is presented in this paper. In order to improve the accuracy of filtering, genetic algorithm (GA) is introduced to optimize the noise matrix, and also filtering parameters in EKF. Simulation results show that the flux observer with optimized filtering parameter has better estimation accuracy and dynamic...
Flux-switching permanent magnet (FSPM) motor is a new brushless machine with magnets in the stator, offering the advantages of robust rotor structure, high power density and high efficiency. In this paper, a transient co-simulation method of coupled magnetic and electric circuit solvers is adopted for performance analysis of a FSPM motor drive. The magnetic circuit and the electric circuit are coupled...
This paper describes novel claw-pole movers interior permanent magnets linear synchronous motor (CPIP-LSM). However the cogging of the CPIP-LSM was very large, it was almost 100% of maximum thrust in the initial model. Changing parameters of the CPIP-LSM partially at 1-phase-driven, and using 3-phase-driven the cogging was dramatically decreased. Finally it was confirmed with the high-thrust model,...
Multi-consequent-pole bearingless motors can be used in low speed rotating and swinging stages (or platforms) under specific conditions. A test machine has been designed and built and in this machine two axes of freedom are actively controlled in the radial x-y directions. The suspension windings are of a novel toroidal shape, i.e., they are wound around the stator yoke. This produces a low axial...
In this paper, a novel structure for axial-flux generators in automotive applications is presented. The machine has a field winding in the inner part of the stator core around the rotor shaft. Because of unidirectional magnetic flux in the stator, the generator behaves as a homoploar machine. For better utilization of the generator, grain oriented silicon steel laminations are used for the stator...
Based on radial basis function neuron network (RBFNN), the model of nonlinear radial force in switched reluctance motor(SRM) is constructed in this paper. Training samples for RBFNN are obtained from the calculation results of a prototype SRM(8/6) with finite element method(FEM). Training algorithm is a hybrid method combining nearest neighbor clustering with steepest gradient descent. The simulation...
In this paper, the time-delayed feedback control method is introduced to stabilize unstable equilibrium points undergoing Hopf bifurcation for an induction motor (IM) drive system. Stability criterion of a nonlinear time-delayed system is first established, and then an effective procedure is shown how to stabilize the unstable equilibrium points by suitably select the feedback gain k and the time-delay...
A simple analytical method is developed to compare the combinations of stator and rotor pole numbers in flux-switching PM machines in terms of back-EMF and electromagnetic torque. The winding connections for machines having all poles and alternate poles wound are determined, based on the coil-EMF vectors. The conditions are established for balanced symmetrical back-EMF waveform. It shows that the...
For induction motor rotating near the synchronous speed, re-switching of power supply could be realized by rapid soft re-switching technology which could eliminate or reduce the inrush current and torque. The intelligent hybrid switches(IHS) based on SCRs is used to implement the control strategy of rapid soft re-switching with series of firing angles. Aiming at the alternating state of soft re-switching...
For stabilizing the steel plate conveyance process, feasibilities of incorporating the linear induction motor scheme to provide the desired normal and propulsive forces have been intensively proposed. With proper optical measurement system installation and electromagnetic force estimations, those gaps among the steel plate and the stator poles can be continuously evaluated and adjusted. Based on such...
This paper presents a new method of on-line estimation for the stator and rotor resistances of the induction motor in the indirect vector controlled drive, using artificial neural networks. The back propagation algorithm is used for training of the neural networks. The error between the rotor flux linkages based on a neural network model and a voltage model is back propagated to adjust the weights...
With the purpose of improving the operation efficiency of wind power generator, this paper, by analyzing the doubly-fed induction generatorpsilas (DFIG) power characteristic, built up the DFIG active power reference calculation model to achieve the maximal power point tracing (MPPT) and the reactive power reference calculation model to minimize generator loss. The stator flux-linkage oriented vector...
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