上帝克道大学 PM(Permanent Magnet)DC Motor Permanent Magnet n Armature (Coil) Cannot rotate further!! 1 国上大峰 Mechanical“Brushes” Armature Magnets (coil) Comutato (rotates) Brushes (⑤tationary) Brushes(电刷)and commutator(换向器)supply and switch current to armature while it rotates 1817 PM (Permanent Magnet) DC Motor B N S Permanent Magnet i i + - n F F Armature (Coil) B N i S i + - n F F F F F F Cannot rotate further!! 18 Mechanical “Brushes” Brushes(电刷) and commutator (换向器) supply and switch current to armature while it rotates