Induction Motor Theory and Operating Principles

This content was originally developed by the Pacific Energy Center to support the Design, Performance and Commissioning Issues class series.   There are also videos that complement these slide presentations by demonstrating basic induction principles that you can access from the Videos page of the website.

The first video in the series provides an overview of the other modules in the series and then moves on to demonstrate the basic principles behind induction motor operation using a simple PowerPoint animation.

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 The second video in the series takes the basic concepts developed in the first video and illustrates their application in the context of the physical form of a real world motor.

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The third video in the series looks at how induction motor characteristics like efficiency, power factor, speed, amps and kW vary with load.

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The fourth video in the series looks at the relationship between work, horsepower, and torque and at the speed vs. torque characteristics of an induction motor.

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​This is the last video in the series.  It looks at how a centrifugal load and its associated speed vs. torque curve interacts with the speed torque curve of the induction motor serving it.   A number of methods for estimating acceleration time are discussed along with the concept of moment of inertia and WK2/WR2.