@yesschembri normally a motors field windings are wired in series with the brushes (armature). When you bypass the windings completely and apply power directly to the brushes, the armature induces an opposing magnetic field in the windings so the motor still works (at the cost of torque I would guess). Wired in this way, motors start to burn out at around 80 volts.
Also there is a way to overvoltage the motor yet save it. If motor is being cooled down to refrigerator temperature and has cool surrounding air, it will run fine overvoltaged for several minutes. I would be careful with settting motors on fire because this can blow the variac during short-out, even if it is a powerful one. This happened to my 250W variac, set on 260W (250V, 1.05A at full load). I thought amps will decline as motor gets faster but variac blew, motor label showed 0.7A on full rpm
May I ask how do you burn out a vacuum cleaner motor with just 120Vac? Normally people use variacs to vary the input voltage to the primary of a ballasted MOT or something, so essentially they have a variable transformer from 0-2Kv. Did you wire the motor incorrectly or does your variac have some built in step up transformer ( which i dont think so) Thanks, great video btw
I Enjoyed these vids very much. Infact ive got a vac motor u can have cos i was carrying the vac upstairs the other day for my wife! and the carry handle snapped clean off! All i could do was watch it go crashing down our wooden stairs into many bits! The motor is still good thou and would like to go out in a blaze of glory! Regards Mike in UK
@ElectronSpark The next time you will overvoltage motors, please put relatively heavy balanced disc on the shaft. Listen to a noise of slow acceleration. One more suggestion for fun: If the motor is universal (magnets are electric on the stator), modify the motor to be ran by separate power supply for magnet and armature, you can run it by DC somehow using rectifier. Once at full rpm, reverse the polarity of magnets, and listen it stopping with the heavy load. Very nice sound will be produced.
I made a concrete impeller for my next motor. It is attached to a reversible AC motor that I made. As soon as I have the time to film it and edit it I will upload it. :)
What you can't see in the video is that I am nearly 8 feet away from the action. Nor can you see the large multipurpose fire extinguisher I have sitting within arms reach, or the open garage door that serves as both ventilation and instant fire exit. :)
@xlaptopx I love the smell! It's been a little while since my last video and my garage is starting to smell like a garage again. I think it's time for a little more electronic incense. :)
What is the deal with all these guys on youtube blowing up good parts? I can understand a kid doing this; but an adult just wasting stuff in such a derpy fashion is beyond me.
