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This paper investigates the influence of the magnetic saturation on the transient performance of Synchronous Reluctance Motors (SynRMs). In addition, the stability limits for the SynRM are studied using a more accurate model. The saturation, cross-saturation and position effects on both direct (d) and quadrature (q) axis flux linkages are considered. A Finite Element Method (FEM) is used to obtain...
This paper analyses a kind of leaf spring ultrasonic motor (USM). A radial vibration of the stator is excited by PZT and then the radial displacement is converted to a rotation of the rotor by the bending of leaf springs. The dynamics model of the motor is firstly studied by theoretical method and then the amplitude-frequency characteristic of the stator is calculated by the Finite Element Method...
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 high speed permanent-magnet (HSPM) machine is appropriate for high speed operation due to its simple structure and high power density. In order to avoid stress damage to rotor caused by the centrifugal force and thermal stress, the strength analysis is very important. The rotor should have enough stability to avoid spaning the critical speed of bending mode. In addition, the structural vibration...
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...
This paper proposes a low-speed, high-torque, axial-flux permanent magnet vernier motor (PMVM) for the auto-focusing system application. The proposed motor is designed by precisely taking into consideration of the limited lens dimensions and camera installation space. The design approach of the vernier motor is an alternative combined design solution, coupled with the analytical method and finite...
A new type of hybrid stepping motor (HSM) with permanent magnets mounted on the stator, namely the stator permanent magnet stepping motor (SPMSM), is put forward based on the structural topology of the conventional one with permanent magnet embedded in rotor. Schematic structures and superiorities of the novel SPMSM are firstly presented. Then the equivalent magnetic circuit of a 2-phase 8-pole SPMSM...
Compact main insulation structure of a power electronic traction transformer(PETT) is designed in this paper. Angle ring and electrostatic ring are set on the end of the high voltage winding to reduce the maximum electric field intensity value and improve the electric field distribution. A model of the end insulation structure is established in ANSYS. By the scanning method, the distance between the...
In order to calculate the stray losses and to avoid overheating hazard as accurately as possible in metal structural parts of power transformer with less computational effort, an analysis method which combined FEM and analytical method is presented. Based on the magnetic flux density and eddy current density on the surface of metal structural parts which are obtained by FEM, the stray losses of power...
The PM parts and electrical excitation part synchronously contribute to the output torque for the parallel hybrid excitation machine (PHEM), which consists of the permanent magnet synchronous machine (PMSM) and the doubly salient electro-magnet machine (DSEM). In this paper, the torque-angle characteristic of the presented machine is analyzed by finite element analysis (FEA). The field current has...
The thrust ripple of Permanent Magnet Linear Synchronous Motor (PMLSM) at load can reach 10% average thrust, which deteriorates thrust performance. To reduce the thrust ripple, two methods of optimizing the primary length and skewing are widely adopted during PMLSM design. In this paper, the effect of skewing technology is investigated. Based on 2D finite element method (FEM), the characteristics...
It is well known that the stranded wire coil is used to reduce the electrical loss of the coil. In this paper, some stranded wire coils with a magnetic substrate are analyzed using the three-dimensional parallel finite element method on the Earth Simulator, which is the vector-type parallel supercomputer. The effects of the magnetic substance on the electrical loss of the stranded wire coils are clarified...
Transverse flux permanent magnet generator (TFPMG) with double-C stator-hoop and flux-concentrated rotor attracts people's attention due to its high power density and simple fabricated procedure. The structure and electromagnetic characteristics of the proposed generator with different pole-pair numbers are described and analyzed in detail by three-dimensional (3-D) finite element method (FEM). The...
In this paper, the thermal field of a large scale permanent magnet embedded salient pole wind generator (PMESPWG) is investigated by using the computational fluid dynamic (CFD) modeling. To reduce the calculation, only one quarter model of the PMESPWG is established according to its symmetry. Based on the electromagnetic analysis and the empirical equations, the copper loss, stator iron loss and rotor...
This paper deals with the design and analysis of high speed 100,000 rpm blushes DC (BLDC) motor for centrifuge. To determine the specifications, the proposed motor is designed using a loading ratio method based on the rated speed and power. First, the design results of the investigated 3kW 100,000 rpm BLDC motor are compared with the simulation results by a 2-D finite element method (FEM), to confirm...
In this paper, the estimation method for operation region of Interior Permanent Magnet Synchronous Motor (IPMSM) is investigated and its improvement method considering dominant harmonics is proposed. The operation region estimated by conventional method does not consider the abrupt back-EMF increase due to harmonics. It causes poor performance than estimation or requirement for marginal voltage on...
Two-phase switched reluctance motor (SRM) attracts more and more attention in both high-speed and unidirectional applications because of its moderate performance and cost compared with its counterpart of three-phase SRM and single-phase one. 8/4-pole two-phase SRM is developed in this paper to take place of the common AC series motor to drive the grinding machine in this paper. The design optimization...
To solve the disadvantages of the permanent magnet synchronous generator, this paper discusses a brushless synchronous generator combining induced excitation and permanent magnet. The structure and principle of the machine are introduced in detail and the finite element model is analyzed. We can get the no-load characteristics and external characteristics by 2D finite element method. The simulation...
This research propose an Artificial Intelligence (AI) technique for transformer design optimization. The optimization is carried out using a genetic algorithm (GA) which allows finding the global minimum. Also the finite element method (FEM) is functional tool for illustrating the resultant optimal design of transformer before making the actual transformer model. Potentially this method can be applied...
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