What force causes a 3-pole motor to spin one way and not the other?

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If you look at How Electric Motors Work, you will see that the field magnet and the rotor magnet attract and repel one another at different points in the cycle. The commutator is in charge of flipping the rotor’s magnetic field.

from Pocket http://science.howstuffworks.com/transport/engines-equipment/question3.htm
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