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DrMemory · 10-07-2004, 10:47 PM

The only way to have a continuous (wide range) variable speed AC motor (not the 2 to 4 speed version) is to use a VFD (Variable FREQUENCY Drive). This can be done electronically by converting AC voltage to DC, and then converting the DC back to AC at different frequencies (at the motors rated AC voltage) to drive the AC motor.

You can also convert the AC to DC and use a DC motor. This is what variable speed AC hand drills do.

10-07-2004, 10:47 PM	#17
DrMemory Cooling Savant Join Date: Jun 2004 Location: Dallas, TX Posts: 101	The only way to have a continuous (wide range) variable speed AC motor (not the 2 to 4 speed version) is to use a VFD (Variable FREQUENCY Drive). This can be done electronically by converting AC voltage to DC, and then converting the DC back to AC at different frequencies (at the motors rated AC voltage) to drive the AC motor. You can also convert the AC to DC and use a DC motor. This is what variable speed AC hand drills do. Last edited by DrMemory; 10-07-2004 at 11:01 PM.