What device can be used to rotate a conductor with a current in a magnetic field?

What device can be used to rotate a conductor with a current in a magnetic field? What device in the frame is used to change the direction of the current every half a turn?

It is possible to rotate a conductor with a current in a magnetic field using the device shown in Fig. 115, in which the frame with an insulated winding is connected to the network through conductive half rings and brushes, which makes it possible to change the direction of the current in the winding after half a turn. As a result, the frame rotates in one direction all the time.



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