How does a sensorless brushless motor work?

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A typical sensorless brushless motor has permanent magnets fixed on the rotor with the electro-magnets mounted around the edge of the motor. As the motor picks up speed it starts to generate electro-motive force in the stator coils. As an example, with the unit switched off and the rotor being spun (for example by a bicycle dynamo) this can be used to generate electricity.

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Author: https://www.zikodrive.com/support/zikouniversity-motor-control-theory-application/sensored-versus-sensorless-brushless-motors-controllers/