CATASTROPHIC Electric Motor Failure - A Winding Shorted FIRE

Catastrophic Electric Motor Failure - A winding shorted out = FIRE! The Lab's motor did not make it! (A typical day in the electric motor shop, perils-a-plenty!)

Category:

Science & Technology

Tags:

• catastrophic
• electric
• motor
• shorted
• fire
• lab

[LTF85199]

why does a motor burn under stress?, not when you give it over design voltage, i am talking if a motor is strained why does it burn. For example, In you car the side window, you restrain it from rising while the button is depressed and caused for the motor to burn out why?

[r83rob]

Under too much stress, if a motor cannot turn freely and thus, the winding gets overloaded and can then kick up higher amperage than its rated for and heat up and then burn. The motor I videoed here was already shorted out with a bad winding, so feeding it normal power resulted in some explosivety and fireworks. FUN!

[TehMG]

Something like that, yeah. The normal rotation and commutation of the windings creates a changing magnetic field and back EMF. When stalled, the winding sees nothing but DC, at which point it becomes little more than a heating element. Similar destruction will happen if you put DC into a transformer.

[LTF85199]

@dshmechanic lolz

[waswestkan]

@TehMG The windings of a stalled AC motor will see AC, not DC. but still AC Yes they will draw more current than they would under normal operation conditions. Simply applying DC to transformer winding doesn't mean destruction. The DC power source fist has to have enough voltage to overcome the winding's DC resistance & the DC power source has to be able to deliver enough current to create heat

[shoprat17]

@LTF85199 more time to have windings connected to the power though the brush/commutator assembly and the windings are being hit with an amperage that they weren't designed to handle for that long of a time

[kiyotewolf]

i came here cause of the pink flames..

[LTF85199]

@foiwater thanks bud, someone else also explained the same thing to me.. very interesting phenomenon..

[pinoyeh]

The FLUX CAPACITOR needs a tuning.

[foiwater]

@YummyMercury All motor's generate

[foiwater]

@LTF85199 It's easy to explain with very basic electric theory.

The motor will draw locked rotor current when it starts up, or if prevented from rotating when rated voltage is applied.

The current it draws is determined by I = V/R, when the motor is in motion however a counter emf is developed and opposes the source voltage, so the motor armature see;s less current, therefore less heat.

Essentially, the motor draws maximum current when the motor is not turning, because of no induced CEMF.

[dshmechanic]

Which pixel is the catastrophic failure?

[Valdiralita]

240p we meet again