Harmonics study for induction motors
The presence of harmonics in the work of induction motors can be pretty bad. Why? They produce elastic deformation, that is, shaft deflection, parasitic torques, vibration noise, additional heating, and lower the efficiency of rotating machines.
How Bad Harmonics Influence The Work Of Rotating Machines (Induction Motors) - photo credit: Fluke CorporationThe movement of the harmonics is with or against the direction of the fundamental. Criterion of forward or reverse rotation is established from h = 6m ± 1, where h is the order of harmonic and m is any integer.
If h = 6m ± 1, the rotation is in the forward direction, but at 1 ∕ h speed. Thus, 7th, 13th, 19th, … harmonics rotate in a direction same as the fundamental.
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Edvard Csanyi
Hi, I'm an electrical engineer, programmer and founder of EEP - Electrical Engineering Portal. I worked twelve years at Schneider Electric in the position of technical support for low- and medium-voltage projects and the design of busbar trunking systems.I'm highly specialized in the design of LV/MV switchgear and low-voltage, high-power busbar trunking (<6300A) in substations, commercial buildings and industry facilities. I'm also a professional in AutoCAD programming.
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