関連ワード:  split ring commutator function    split ring commutator function in dc motor    split ring commutator function igcse    slip ring commutator function    split ring commutator purpose    slip ring commutator purpose    function of split ring commutator in dc generator    function of split ring commutator in electric motor    function of split ring commutator and the brushes    function of split ring commutator in ac generator