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I need precise speed regulation that does not change with load. Think screwcutting... A universal motor is generally made to run at high speed. If you try to slow it down it is going to get angry. (technical term).
DC PM motors are the preferred motor for this application. Second would be a 3PH AC. What started me down this route was simply wondering why i could buy 90v-120v DC motor controllers for stationary machines that operated on house current. After speaking with an engineer friend he tells me this is probably due to the fact that making a DC controller of that nature would probably be impractical. Simply because the 120VAC would first need to be converted down to the neighborhood of 36v using a large transformer or other type of converter. > > To (finally) cut to the chase, what you probably want for your lathe is a > 120 volt universal motor, and a nice foot-pedal operated controller. > > > David Roden - Akron, Ohio, USA > |