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The supply given to the tractive electromagnets is typically DC (Direct Current) or AC (Alternating Current) electrical power, depending on the design and application of the electromagnetic system. Tractive electromagnets, used in various applications such as electrically powered trains, magnetic levitation systems, and certain types of cranes, require a substantial and controlled power supply to generate the magnetic field needed for their operation. This magnetic field is used to create the traction force necessary for movement or to hold objects in place. The choice between AC and DC supply depends on factors like efficiency, control complexity, and the specific requirements of the application, such as the need for variable speed control or the magnitude of the force required.