A DC stepper motor translates current pulses into motor rotation. It is typically used for applications like camera zoom drive and film feed, fax machines, printers, copying machines, paper feeders/sorters, disk drives and robotics. A typical unipolar motor contains four winding coils. Applying voltage to these coils forces the motor to advance one step. In normal operation, two winding coils are activated at the same time, causing the motor to move one step clockwise. If the sequence is applied in reverse order, the motor will run counterclockwise. The speed of rotation is controlled by the frequency of the pulses. Continuous operation at high speeds is not possible with a DC stepper motor due to rotor heating. High speeds can be used for many positioning applications. It is difficult to de-magnetize a DC stepper motor. However, too much current will damage the motor. Excessive heating may melt the insulation or damage the rotor lamination. If this happens, the effects can be the same as de-magnetizing the rotor.