DC Motors:Principles of Operation ME350 A wire carrying current experiences a force in a magnetic field. F-(lx B) Magnetic Flux Density(磁通量) Induced force (Tesla) Current Length of wire in the (amp) direction of i(m) IxB I×B=|IBsin B 88 ME 350 DC Motors: Principles of Operation • A wire carrying current experiences a force in a magnetic field. Magnetic Flux Density (磁通量) (Tesla) = i l ×BF )( Induced force Current (amp) Length of wire in the direction of i (m) ×BI I B θ =× BIBI sin θ