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Torque ripples exist in permanent magnet synchronous motors (PMSMs) mainly due to non-sinusoidal flux density distribution around the air-gap. These torque ripples vary periodically with rotor position and are reflected as speed ripple, which degrades the PMSM drive performance, particularly at low speeds. In this paper, a simple expression based on the harmonic compensation technique and Fourier...
This paper proposes a novel digital hardware control of motor drive system implemented in FPGA (field programmable gate array) not only a current control loop but also a speed control loop. In addition, to decrease a torque ripple caused by a PWM switching, linear servo amplifiers are employed for the driving source. As the results of using hard ware control, high precision speed control system of...
This paper proposes an active filter (AF) topology to reduce the torque ripple and harmonic noises in a permanent-magnet synchronous motor. The topology consists of an insulated-gate bipolar transistor AF and two resistance-inductance-capacitance high-pass electromagnetic interference (EMI) noise filters, i.e., one in the primary and the other in the secondary circuit of the coupling 1:1 transformer...
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