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The excitation windings of the series excitation DC motor are connected with the armature windings and then connected with the DC power supply. The excitation current of the DC motor is the armature current. The compound excitation DC motor has two excitation windings with shunt excitation and series excitation. If the flux potential generated by the series excitation winding is the same as the flux potential direction of the shunt winding, it is called the product complex excitation. If the two magnetic flux direction is opposite, it is called the difference compound excitation.