Abstract |
In power converter systems for AC electric cars, the DC link voltage contains a ripple component
because of the single-phase voltage source. Therefore, a beat phenomenon of the motor current
occurs, which causes torque ripple and a howling noise of the motor. A solution to this problem is use
of an additional series resonant filter at the DC link. However, addition of another component is an
obstacle to making the power converter system smaller and lighter. This paper proposes a novel
beatless control, based on the frequency modulation and vector control, which can effectively
suppress the beat phenomenon without using an additional resonant filter at DC link. Effectiveness of
the control is demonstrated with simulation and experimental results. |