Home » English riddles » Electrical Machine » Machine riddle no.3 – Power generation in Mathematical city » Reply To: Machine riddle no.3 – Power generation in Mathematical city

Reply To: Machine riddle no.3 – Power generation in Mathematical city

#1192
Cheers,JSP

    >For integration of distributed forces on induced >current elements we can write: >F = ? IB x dL where ” I ” is loads current, B is >uniform magnetic flux density and ” L ” is electrical >path that closed with electrical loads in region of >uniform magnetic field. >Because of magnetic flux uniformity, we can write: >F = -IB ? dL >Also the loop of electrical path is closed by loads; so >we can write: >? dL = 0 and F = 0 This is misleading. First of all arguing that the line integral of dL is zero because it is a closed path only makes sense for calculating the force on a charge moving in an electric field. It does not apply to a current in a wire in a magnetic field. Second, the current in a closed path will not be in the same direction inside the magnetic field so the net torque will be non zero. Think of a square loop; two sides of the loop will have zero torque on them and the other two sides will have opposite torques so they will add. Third, in some generators the B field is rotating and the load winding is stationary. The varying B field induces a voltage on the load winding. More turns gives more voltage. Stronger B gives more voltage. As the load increases, it takes more work to rotate the B field. If B does not vary, you don’t get any induced voltage. >What is your opinion? Tell the mayor to stick to poltics and let the sparky’s deal with the electricity. Cheers, JSP EE but not a PE