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Permanent magnet (PM) synchronous motor has the magnet devices with variable shapes and location, so the electromagnetic field in PM synchronous motor is more complex. Finite element method (FEM) provides an accurate means of determining the electromagnetic field distribution, with due account magnetic saturation characteristics. With the ANSYS, the distribution of electromagnetic field in PM synchronous...
This paper presents effect of magnet arrangement on torque characteristics of a magnetic flux concentration type surface magnet motor. Some constructions of the permanent magnet array were tried to reduce the cogging torque. Their magnetic flux distributions and torque characteristics were calculated by using the finite element method.
A new surface permanent magnet synchronous motor is developed by using concentrated permanent magnet arrangement. In this motor, the same magnetic poles of the assembling permanent magnets are faced to each other to generate larger magnetic flux density in the air gap. We call this the concentrated surface permanent magnet synchronous motor (CSPMSM). In order to realize higher torque and lower cogging,...
The problem of electromagnetic field in permanent magnet synchronous motor(PMSM) used for hybrid electric vehicle(HEV) is discussed in this paper. The electromagnetic field distribution, air-gap magnetic flux density and the magnetic leakage factors under no-load conditions were analyzed with finite element method(FEM). The result is very useful for optimizing the design of the motor.
If the air-gap is small, the computing error can be neglected when the conventional formulas are used to calculate the air-gap magnetic field. But they will result in a great error for the calculation of the air-gap magnetic field of a motor with a big air-gap. The magnetic potential superimposed method is hereby a more precise calculation solution for a motor with a big air-gap. The validity of the...
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...
It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when permanent magnet (PM) shifting is adopted. To reduce cogging torque, both the original and newly introduced lower harmonics of cogging torque should be reduced. In this paper, the effect of PM shifting on Bnz(B nz is the Fourier coefficient of the square of magnetic flux density...
In this paper, the method with different pole arc combination was adopted to reduce the cogging torque in PMDC motors. To minimize the cogging torque, a global optimization algorithm (zooming algorithm) and the finite element method (FEM) are combined to find the best pole arc combination. The Fourier coefficient of the square of magnetic flux density is analyzed to determine the feasible region from...
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