Spaceclam

12-15-2005, 03:54 PM

Hello,

i know how to calculate current draw in a stall situation, but how do i calculate current draw while the motor is running at a certain rpm?

reason being, i am making a powerfeed for a mini-mill, and am stacking (4) 56mm stators together, and i want this motor to be as powerful as possible without exceeding 12a @ 5v while running under load, becuase that is what the only power supply that will fit on the back of the mill nicely that i own will supply.

also, one other question. i had an idea, that will allow me to change the wiring of the motor from wye to delta by flipping a switch, which will allow me to move the mill table rapidly with no load, without compromising the ability of the wye winding to produce the low rpms and torque required for a steady slow cut. do you think this will work? the "b" stands for beginning, the "e" stands for end. the numbers stand for the phase#. the switch is a 3 row on/on toggle. the circle is the motor

i know how to calculate current draw in a stall situation, but how do i calculate current draw while the motor is running at a certain rpm?

reason being, i am making a powerfeed for a mini-mill, and am stacking (4) 56mm stators together, and i want this motor to be as powerful as possible without exceeding 12a @ 5v while running under load, becuase that is what the only power supply that will fit on the back of the mill nicely that i own will supply.

also, one other question. i had an idea, that will allow me to change the wiring of the motor from wye to delta by flipping a switch, which will allow me to move the mill table rapidly with no load, without compromising the ability of the wye winding to produce the low rpms and torque required for a steady slow cut. do you think this will work? the "b" stands for beginning, the "e" stands for end. the numbers stand for the phase#. the switch is a 3 row on/on toggle. the circle is the motor