Premium Membership

Study specialized electrical engineering articles, papers & video courses in low/high voltage areas. Get 50% OFF on all courses at the EEP Academy with the Enterprise Plan.

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.

Premium Membership Required

This technical article/guide requires a Premium Membership. You can choose an annually based Plus, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers. With EEP’s premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.

Check out each plan’s benefits and choose the membership plan that works best for you or your organization.

Note that an Enterprise subscription plan includes a 50% discount on all video courses and bundles at the EEP Academy.

Log In »Learn More »

Premium Membership

Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! It helps you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

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.

Leave a Comment

Tell us what you're thinking... we care about your opinion!

  −  four  =  four

Electrical Engineering Courses

Learn to design electrical power and industrial automation systems through professional video courses.
Protection testing