6-pulse Technology and Harmonics (part 5)
Continued from this article: 6-pulse Technology and Harmonics (part 4)
We will explain more on harmonic impact on motors in these 2 articles.
It's said by some experts that harmonics can significantly impact the motors, basically through voltage distortion. This voltage distortion at the motor's terminals translates into harmonic fluxes within the motor. These harmonic fluxes don't contribute much to motor torque. However they do rotate at a frequency different than the rotor synchronous frequency. In turn it induces high-frequency currents in the rotor.
The impact on motors is similar to that of negative-sequence currents at fundamental frequency. The additional fluxes do little more than induce additional losses. One indicator of harmonic voltage distortion is increased motor heating.
Excessive motor heating problems usually begin when the voltage distortion reaches 8% to 10% and higher. (to be continued)
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Powtran Technology Co., Ltd. (Shenzhen Powtran Technology Co., Ltd., DaLian Powtran Technology Co., Ltd.)
