Originally Posted by asarose247
ok - strong motor good . . .
any EE minded folks that can discuss why a 1, 1 1/2, or 2 hp @ 220 might be able to provide the power to maintain the rpm as monitored/controlled by the VFD?
I have 200 amp service at my home, I can do some power if needed , like a 60 amp welding circuit . . just sayin'
some benefits of a flat pack would be: no heavy double baffle, less shipping costs (?), minimum glue up time, air tight sealing not required, saves a buttload on veneer/exotic finishes,
tinkerers delight . ., vibration isolation desired?, no warped plywood, no duratex, . . . it's endless
because of torque strength. its been mentioned a few times now lol. i would say a 3/4 1ph is minimum and 3/4 3ph or 1hp 1ph would be reccomended but i use a 1/2 3ph. id say a 1/4hp 3ph would be min
3phase is more economical too. as discussed here:
and i quote: http://www.practicalmachinist.com/vb...ciency-171972/
The problem with a single phase capacitor run motor is they have a secondary motor winding and a capacitor in series to provide delayed supply of AC sort of like a pseudo two phase AC motor. The ideal value of the motor run capacitor varies with the mechanical load to keep the phase delay right for maximum electrical efficiency.
If you could get a really high quality single phase motor and rig up some microprocessor circuit to switch different value capacitors in and out depending on loading, you'd have much better efficiency than a normal single phase motor with a "Best guess" value of capacitance that can be a compromise unless the mechanical load is constant at just the ideal amount.
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01-06-2009, 10:39 AM #4
MBensema MBensema is offline
A quick check of the Baldor website shows many of the 1 hp single phase motors have an efficiency of about 65-70%.
Other then losses due to the capacitor, I would expect higher losses due to the higher current in the windings for single phase motors vs three phase. For the same HP and voltage, a three phase motor requires 43% less current per phase which means less heat and less power loss."