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Starting phase of a motor in general is a very complicated period. Motors draw a large amount of current, several times the normal full-load current when first energized. In starting period of Line Start Permanent Magnet Synchronous Motors (LSPMSM), high current causes saturation in stator and rotor. The effect of saturation on the “q-axis” synchronous inductance, Lmq, of LSPMSM is studied in this...
Cogging torque in permanent-magnet motors is one of the most important problems to be considered in high performance applications especially in low speed and direct drive applications. In this paper, the analytical expression for cogging torque in permanent-magnet synchronous motors (PMSM) with auxiliary teeth is derived by the energy method and the Fourier series analysis, based on the air gap permeance...
The development of electric vehicles has brought about a campaign for researching and developing new electric motors. In this paper, a novel wheel hub motor is proposed, according to the regulation that electromagnet and permanent magnet interact in the way that homopolar magnets repel and heteropolar magnets attract. The motor can be assembled by identical electromagnetic units with U-shaped electromagnets...
Permanent magnet brushless DC motors used in aerospace generally have numerous qualities such as light weight, small size, and high efficiency. This means that the thermal design of those motors is very serious. In order to obtain an accurate thermal field simulation of a permanent magnet brushless DC motor, both electromagnetic and thermal fields have to be calculated in a coupled simulation. In...
This study deals with the characteristics analysis and optimum design of Permanent Magnet Assisted Synchronous Reluctance Motor (PMASynRM) using Finite Element Method (FEM) and Response Surface Methodology (RSM). The focus of this paper is finding of optimum design solutions due to the characteristics analysis of d, q axis inductance according to the size and magnetizing quantity of interior permanent...
When we design the PM machines, accurate calculation of inductance parameters are very important. Inductance parameters have nonlinear characteristics along the magnet size, because of iron core is saturated by magnet flux and armature reaction flux. In this paper, we calculate inductance parameters by magnetic equivalent circuit method and finite element method. Moreover, we compensate the equation...
The rotor of IPM (Interior Permanent Magnet) brushless motor is characterized with a high-strength structure so that the magnet is protected from centrifugal separation when running at a high speed; also, as designed a non-concentrically circular rotor to increase the motor torque output, there is a reluctance torque produced by the salient poles effect in addition to the electromagnetic torque generated...
The field regulation range of Synchronous/Permanent Magnet Hybrid Motor is studied by finite element method and magnetic field distribution of different stator yoke widths is calculated in this paper. Synchronously, the influence of yoke width on field regulation range is analyzed and the characteristic of field regulation of different yoke widths is obtained. These analyses testify the characteristic...
This paper provides a novel permanent magnet motor with composite-rotor for flux weakening. The rotor consists of two segments with different permanent magnet materials. One kind of permanent magnet material has very high coercive force and high remanence, thus a strong air gap magnetic field could form; the other has low coercive force, thus d-axis current pulse could demagnetize it easily. The structure...
The magnetically excited acoustic noise is calculated for three high-speed permanent-magnet motors with identical stators, but with different rotors. An analytical approach is used for the calculation of the magnetic radial forces. The components of the radial magnetic flux density in the middle of the air gap are determined with the help of finite element method (FEM) static calculations, which allow...
Permanent magnet synchronous machines are well suited for hybrid electric vehicles due to their unique merits. However they have two major drawbacks i.e. high cost and small speed range. In this paper an optimal design of a permanent magnet machine is presented. A reduction of permanent magnet material for a constant torque and an extension in speed and torque ranges are chosen as the optimization...
The armature reaction of brushless DC motors have important influence on magnetic field distribution, torque ripple, motor inductance and losses. The control mode of surface-mounted brushless DC motors make that the magnetic field circumrotates uniformly but jump every 60deg, and the different angles between stator and rotor magnetic potentials lead to the complexity of armature reaction. The armature...
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