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If current direction through a series motor is reversed, the polarities of the field poles and the armature conductors are both riversed, resulting in a pushing effort between them in the same direction. because of this, a series motor will operate on AC supply, it is direction of rotation being the same for both half cycles. The lower the frequency of AC, the greater the torque that can be produce. If the frequency is high, the inductive reactance of the coil limits the current that can flow and the torque of the motor.
