3 Phase Motor Startup No Soft Start

Quick comparison between a 2 phase motor VS 3 phase motor, across the line startups. First motor is a 15HP 2 phase motor powering the main supply fresh air fan for a 90+ year old school.
Second one is a 35hp 3 phase motor powering a large fan. The wheel (fan) is roughly 6ft in diameter, weighs over 450 lbs and rotates about 950rpm. First startup after replacing the belt on it and has a great motor whine

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[FerroequinologistofColorado]

The hum of an electric motor starting up is music to my ears

[puxrb]

"Why did the lights just dim?"

[DieselMadman]

The sound of that electric motor tho. Sounds so good. I love the sounds of old electric motors starting up.

[Goetterdaemmerung]

A school I went to had a giant fan just like this one, with the pulley and everything, I was allowed to see it every now and then, it was awesome.

[donwright]

I Like the noise of the London tube trains as they move off.

[bamaslamma]

Love the startup sounds of these motors. Love to see old machinery still running strong. What's the voltage and amperage on these? I counted seven belts on the first fan. How do you loosen them for replacement?

[bledlbledlbledl]

from back in the day when motors were rated for hard-line starting...
Nowadays they tend to be "inverter duty" and "vector duty", which basically means they've skimped on the temporary overload capacity and then put some word-spin on it to make that sound like a good thing :P

[pedro]

Ohh, the electron sound never gets old

[yfnratchet]

Reminds me of the startup for the heating system at my old house— it’d echo all the way through the vents.

[cameron-pggf]

Sometimes i imagine being in a car and the car takes off and you hear the sound of a 3 phase motor

[sharpshooterCZS]

So what? I remember in a water pumping station a pump with a 400V/130kW 3-phase motor - without softstart or Y/Δ starting. When the engine started, the lights went out for 10 seconds...

[vieuxacadian]

I once worked at a building that had 3 fans / 7ft diameter each to a shared chamber . there was ship door hatches and the motors were 200 hp @ 600 vac each !

[alenanikitina]

your electric company must love you for the Amps you pull when turning on

[williamgunter]

The 3 phase system allows for a faster, smoother start up under load than single phase. It's tough to explain, but in simpke terms imagine a sequenced electromagnetic push at each 120° around the entite circle.

Man, the second 3 phase motor sounds like a subway accelerating :D

[logycam]

Gotta love when there is zero belt slip!

[sr]

Back in the 1950's we had a large three phase motor that pumped water from a well for 60 Cabins in our Motel. The transfer belt got warm and we "had" a cat that laid on it for naps.

[alouisschafer]

0:27 oh boy that thing needs a VDF starter bad

[MenzelMotors]

we can understand the electric motor sound fans very well, that's why we upload several videos of this kind to our channel

[vacexpert]

I wish modern school still used big ass fans to bring in fresh air