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A comparative analysis of ac and dc machines' advantages and disadvantages based on machine design and industry standards is required before making a final selection. Both machines are differentiated from one another by factors such as construction, torque production, equivalent circuits, load ranges, and power and torque density ratings. Dc motors have the advantage over ac motors in terms of maintaining constant power flux at low speeds., Similarities outweigh differences between ac and dc motors, but don't confuse basic machine design with industry standards when making a choice. For many years, speed controls for ac motors relied [...]

Motion control system designers have the option to use either alternating current (ac) or direct current (dc) motors. Ac motors are suitable for systems controlling only speed and operating on open loop. They are less expensive than dc motors and are being built with chip technology. Dc motors are recommended for systems categorized as servocontrollers. They are less expensive compared to other drives and can support the speed and torque specifications of a wider range of equipment., Motion-control systems typically fall into one of two categories. Some systems control only speed and normally run open loop. The prime mover may be a step motor or an ac [...]