05-14-2015, 12:05 PM
Thanks for the responses.
Did a little research on the great goddess google. No representative curves of current vs torque but seams the split phase motor is less efficient than a capacitor start.
Did a little more physical testing with my hi tech dyno (stick) and yes there is a slight change in current with a reasonable load, but less than I expected as Steve saw too. So induction motors are horrible power eaters with no load.
Interesting info on the rpm at rated hp Terry, thanks on that one, didn't know that gem of knowledge. Will now tack the motor with no load and see what it reads, should be higher than the plate rating then.
Was planning on a timer Steve, no point running at night when the air is damp.
Guess I may as well load it and move lots of air if reducing the flow is going to make so little difference. The one paper I read said they were the most efficient at or near rated hp.
I have a 1/4 hp motor so will use it instead of the 1/3 hp and save an amp or 110 wats and belt it to get the motor close to the rated rpm.
Thanks
Did a little research on the great goddess google. No representative curves of current vs torque but seams the split phase motor is less efficient than a capacitor start.
Did a little more physical testing with my hi tech dyno (stick) and yes there is a slight change in current with a reasonable load, but less than I expected as Steve saw too. So induction motors are horrible power eaters with no load.
Interesting info on the rpm at rated hp Terry, thanks on that one, didn't know that gem of knowledge. Will now tack the motor with no load and see what it reads, should be higher than the plate rating then.
Was planning on a timer Steve, no point running at night when the air is damp.
Guess I may as well load it and move lots of air if reducing the flow is going to make so little difference. The one paper I read said they were the most efficient at or near rated hp.
I have a 1/4 hp motor so will use it instead of the 1/3 hp and save an amp or 110 wats and belt it to get the motor close to the rated rpm.
Thanks
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Greg
Greg