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The magnetic fields of permanent magnet brushless DC motors surface-mounted with parallel magnetization magnets and radial magnetization magnets were computed with finite element method. The finite element computation results show that the air-gap flux density of brushless DC motor with radial magnetization magnets is increased by 25% than that of brushless DC motor with parallel magnetization magnets...
As VLSI fabrication technology developing to VDSM and the magnitude increasing rapidly??a more effective optimized algorithm is requited to realize circuit routing in the physical design. In this paper, through optimizing the basic ant colony algorithm based on ant colony system, a better solution is found. It can improve the problem of excessive search time using the basic ant colony to solve traveling...
An optimization method for power/ground network based on genetic algorithm was presented in this paper. The method could deal with the problem from the VLSI placement stage combined with the characteristic of the power/ground network. It had optimized the power/ground network floor planning by the improvement of the placement of the modules. The simulation proved that the anticipant result was achieved.
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...
In order to obtain p-type ZnO thin films, effect of atomic ratio of Zn:N:Al on the electronic and structural characteristic of ZnO thin films was investigated. Hall measurement indicated that with the increase of Al doping, conductive type of as-grown ZnO thin films changed from n-type to p-type and then to n-type again, reasons are discussed in details. Results of X-ray diffraction revealed that...
Permanent magnet brushless DC motors possess high efficiency and high energy density, so they are provided with the features of saving energy and high power volume ratio. These features fit traction drive for Electric vehicle and railway trains excellently. An advance angle technique extends the constant power speed-adjust scope, and advance angle affect the electromagnetic performance of brushless...
A Limited frequency current controller suitable for Switched Reluctance Motor Drives (SRD) is introduced in the paper. Chop frequency upper limit of the controller is fixed, but the chopping frequency will change low according the winding current and rotor speed. The controller eliminates the unnecessary chopping at high rotor speed and limits the chop ping frequency at low speed. A Matlab simulation...
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