25 Circuits Overview

When discussing motor controls, there are two circuits that need to be well understood.

The first is the . This circuit is relatively straightforward. It is a 3-phase circuit which powers the motor and can operate as high as 600A at 600V or even beyond.

The second is the . This is the circuit which controls the power circuit. This circuit can be as simple as a two-wire , or it can be very complex with many interlocking features and multiple starter and timer coils. The control circuit will often operate at a lower relative to the power circuit.

We will be spending the majority of our time discussing common control-circuit designs, so it’s best to start with a quick overview of the power circuit.


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Basic Motor Control by Aaron Lee and Chad Flinn is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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