AC motors have some advantages over DC motors:
AC motors tend to be smaller, more reliable, and less expensive. However, they generally run at a fixed speed that is determined by the line frequency.
DC motors have speed-control capability, which means that speed, torque, and even direction of rotation can be changed at any time to meet new conditions. Also, smaller DC motors commonly operate at lower voltages (for example, a 12-V disk drive motor), which makes them easier to interface with control electronics.
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