is it possible to use a motor from sewing machine to use as wind turbine? it has no magnets, i think its induction type. it produces like .5 milliamps when i turn by hand. it runs on 120V @ 95A. think you can help. thank you
I think the answer is no, because the only way to induce a magnetic field into the rotor is to apply a voltage to the same stator, where you want to extract the energy.
Could it be primed, like a water pump ?
I doubt it.
Would it have to be at the same freuency as the rotation of the propeller, lagging ?
By the way, that tiny current is likely from some residual magnetism in the rotor, which theoretically has zero magnetism when no current is applied to the motor.
Yes; driving one of the main coils and synchronous demodulation of the 2 sense coil outputs would enable angle to be found as arctan of demod. outputs. However, easier to drive both main coils with cos() and sin() as for motor, and use 1 sense coil. Comparing phase of its output with one of the drive signals would give direct info. on angular position.
Best Ive seen so FAR!
gddeen1 10 months ago
Very well presented.
ntn888 2 years ago
is it possible to use a motor from sewing machine to use as wind turbine? it has no magnets, i think its induction type. it produces like .5 milliamps when i turn by hand. it runs on 120V @ 95A. think you can help. thank you
ppsjsh 2 years ago
Nobody answered. So I will take a try at it.
I think the answer is no, because the only way to induce a magnetic field into the rotor is to apply a voltage to the same stator, where you want to extract the energy.
Could it be primed, like a water pump ?
I doubt it.
Would it have to be at the same freuency as the rotation of the propeller, lagging ?
Difficult to do, at best.
I say forget it.
Good webpage here about such motors:
phys unsw edu au/hsc/hsc/electric_motors1 html
definitionofis 2 years ago
By the way, that tiny current is likely from some residual magnetism in the rotor, which theoretically has zero magnetism when no current is applied to the motor.
definitionofis 2 years ago
Comment removed
Hadesqq 2 years ago
Awesome. Perfectly explained!
chiefer99 2 years ago
Absolutely amazing job! Your first application was the principle a resolver operates on correct?
chiefer99 3 years ago
Yes; driving one of the main coils and synchronous demodulation of the 2 sense coil outputs would enable angle to be found as arctan of demod. outputs. However, easier to drive both main coils with cos() and sin() as for motor, and use 1 sense coil. Comparing phase of its output with one of the drive signals would give direct info. on angular position.
james9149 3 years ago
Thank you. Very informative and clear.
urveen 3 years ago