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While there are important advantages of DC motors, including compact design and battery operation for portability, as well as a high degree of torque and speed control, DC motors have some inherent disadvantages that include relatively high initial cost and short operational lifespan for heavy-use industrial applications. High maintenance due to wear of brushes and commutators. Potential for sparks between contact surfaces, requiring operation outside of hazardous or explosive environments. And possible radio frequency or RF interference with nearby devices due to strong magnetic fields produced by the stator.