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Any ideas on what I could do with this monstrosity?
GadgetBoy:
Just pulled this surprisingly nice reversible AC motor out of a really shitty neck massager - it literally left bruises, which isn't surprising, given the gear ratio it was using. LOTS of torque.
I want to do SOMETHING with it, any suggestions?
P.s. I know the capacitor is what helps it be reversible, but my motor control memory is hazy on why, if anyone wants to refresh me...http://cloud.tapatalk.com/s/5c9c0e466c005/VID_20190327_164856_174.mp4
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james_s:
It's hard to see how it's wired there but if it's reversible then it's probably a PSC motor in which case the capacitor creates the phase shift necessary to set up a rotating magnetic field using the two windings. The direction the motor rotates depends on which winding has the capacitor in series, but without it the motor won't run at all.
T3sl4co1l:
Or if you like -- one winding can be powered and the shaft won't spin at all (by itself), but it can be started equally easily in either direction with a gentle push.
Mind, split-phase motors aren't made for "impedance protected" operation. You don't want to leave it plugged in and stalled for any length of time, just long enough to demonstrate this, if you're curious. :)
Tim
GadgetBoy:
--- Quote from: james_s on March 28, 2019, 04:36:22 am ---It's hard to see how it's wired there but if it's reversible then it's probably a PSC motor in which case the capacitor creates the phase shift necessary to set up a rotating magnetic field using the two windings. The direction the motor rotates depends on which winding has the capacitor in series, but without it the motor won't run at all.
--- End quote ---
Forehead smack moment. I even mentioned phase shifting in my video when I took the massager apart (the cap on the motor is suspiciously similar to the ones you find in those power saving scams).
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GadgetBoy:
--- Quote from: T3sl4co1l on March 28, 2019, 12:12:49 pm ---Or if you like -- one winding can be powered and the shaft won't spin at all (by itself), but it can be started equally easily in either direction with a gentle push.
Mind, split-phase motors aren't made for "impedance protected" operation. You don't want to leave it plugged in and stalled for any length of time, just long enough to demonstrate this, if you're curious. :)
Tim
--- End quote ---
I like this idea, I'll have to bodge something together to demonstrate that.
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