- #1
21joanna12
- 126
- 2
i have heard it said that back force occurs in generators and back emf occurs in motors, however I was considering a motor and I thought that it seems to me that as the coil is rotating and it has the changing flux linkage, and thus a back end is induced in it by Lenz's law, this reduces the overall potential difference in the coil circuit, reducing the circuit current and so the rate of rotation of the coil decreases, effectively acting as if there is a back force on the coil. Do back emf and back force always come together? I'm not quite sure how to apply this to a generator though- the coil rotates in the magnetic field so an emf is induced in it which creates a current so that a back force is experienced on the coil, but I can't see how back emf comes into this...