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flat plate collectors solar power conversion various types of speed control in dc motors speed control methods in dc motors magnetism magntic properties tertiary winding three phase transformer connection types of pmdc working principle of pmdc mmf of distributed windings multiple excited system excited system concept of co-energy singly excited system electromechanical energy conversion phasor diagram equivalent circuit ideal transformer construction and working principle of transformer basic laws anr rules of machines construction of dc machines outdoor lightning lightning types electric traction control roatating machine leakage flux