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Electric Motor


     

    Use Fleming's LH Rule to confirm that:

     

    AB : experiences force into page

    CD : experiences force out of page

    BC & AD:  parallel to field thus no force.

     

    After half a turn the coil is in this position.

     

    Use Fleming's LH Rule to confirm that:

     

    CD : experiences force into page

    AB : experiences force out of page

    BC & AD:  parallel to field thus no force.

    To keep the coil rotating, the current must be reversed each time the coil has rotated through 180° - the commutator does this.

    You should be able to use diagrams and/or other appropriate information to explain how electromagnetic effects are used in simple d.c. motors and circuit breakers.

    Here is a link to a set of pages from Schoolscience - this takes you through how the motor works with some interactive illustrations - worth a look!

    Here is a link to a pdf that compares the motor and the generator - they are often confused by students because the scientific diagram is so similar! My students found this very useful.