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Home / Technical Articles / How Bad Harmonics Influence The Work Of Rotating Machines (Induction Motors)

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)
How Bad Harmonics Influence The Work Of Rotating Machines (Induction Motors) - photo credit: Fluke Corporation

The 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

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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