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Learn about regeneration, Part 2: Motor as a generator

Posted: 05 Mar 2009     Print Version  Bookmark and Share

Keywords:regeneration  counter electromotive force  motor  generator 

Part 1 of this article provides an overview of regeneration—what it is and how it occurs. This second instalment takes a look at the motor as a generator and offers example formulas for calculating the required size of a motor.

A motor behaves as motor and as generator at the same time. In fact while a motor is 'motoring', that is doing mechanical work, it generates counter electromotive force (CEMF) acting as generator, although the CEMF is lower than the battery voltage so the motor acts as a load and absorbs current.

In certain situations the CEMF may overcome the battery, in which case the generator component becomes dominant; the motor acts as a generator inverting the direction of its current and forcing it into the battery.

View the PDF document for more information.

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