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Due to its high energy density, NdFeB permanentmagnets (PM) are very often used in the rotors of radial-flux PM machines. As the NdFeB-magnets are good electric conductive, electric currents are induced in the magnets when they are exposed to a varying magnetic field. This varying magnetic field has two causes: variation of the air-gap reluctance due to the effect of stator slots, and armature reaction...
Torque pulsations are one of the major disadvantages of the Permanent Magnet Synchronous Motor (PMSM) servo drives. In this paper a new on-line three phase reference currents modification method is proposed based on Fourier analysis and harmonic identification to reduce torque pulsations and current harmonic noises in PMSM driven by field oriented control algorithm. Although the new effective schemes...
Multilevel voltage source inverters are emerging as a new breed of power converter options for high-power applications. Various topologies and modulation strategies of multilevel inverters have been proposed. In this paper, the different multi-carrier PWM techniques are investigated and several interesting characteristics of them are revealed. A new method of multi-carrier PWM strategies is also proposed...
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