How is speed control of a DC propulsion motor accomplished?
β’ DC motor speed control basic relationship between voltage, current, and speed β’ Difference between DC and AC speed control methods β’ How frequency relates to speed in AC motors, not DC motors
β’ Ask yourself: in a DC motor, which electrical quantity has the most direct effect on the motorβs speed? β’ Which of these choices sounds like a general type of equipment, and which sound like the actual method used to change speed? β’ Which options are more closely associated with AC propulsion systems rather than DC systems?
β’ Verify which method directly changes the armature voltage in a DC motor. β’ Check which options mention frequency, and recall whether frequency affects DC or AC machines. β’ Identify which answers describe control techniques specific to AC drives (like inverters) rather than traditional DC motor control.
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