| Electronics > Projects, Designs, and Technical Stuff |
| Making an induction motor go crazy fast. |
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| schmitt trigger:
You are correct, shrapnel from a disintegrating fan, is what one should be concerned with. The key is that they have a larger diameter than the rotor itself, meaning larger forces, and they are protected by a thin steel mesh which can be easily breached. |
| Circlotron:
--- Quote from: Yansi on August 29, 2019, 02:33:44 pm ---but y uno 3phase is 120 dungarees, not 60? --- End quote --- I know it sounds wrong, but with one wire of the delta grounded you drive the second wire with a sine wave and the third wire with a sine wave 60 deg shifted. Again, it sounds wrong, I know. I had to simulate it to prove it to myself. |
| coppercone2:
--- Quote from: Yansi on August 29, 2019, 03:44:44 pm ---Welcome to the world of VFDs. Since the 1980s or when... --- End quote --- nothing ruins your day more then 'i need a 200$ vfd to use this totally cool motor I spent 3 hours removing from a washing machine I found on the street so I can do a weekend project'. I hate them. Thought you were in the clear ? no way, now its time to figure out which expensive 200$ mystery box won't blow up for your shoe shiner you can buy for 25$. :P the only reasonable options is belt drives, because gears and shaft alignment are way out of most people leagues. At least the belt is.. kinda achievable. But still adds oodles of work and no one really does it. I want this thing to spin turns into learning how to use bearings and belts and pullies and ugh AC motors are a massive trap IMO, and BLDC is not found in scrapfinds usually :( you get all excited when you get a new blender that you got a motor (which will sit for 10+ years before you scrap it for copper). |
| Circlotron:
--- Quote from: Ian.M on August 29, 2019, 01:01:00 pm ---Edit: corrected assumed rotor diameter - I did the math for 1" radius (and assumed a uniform steel cylinder for the K.E. calculation, so somewhat of a spherical cow). --- End quote --- Rotor is 70mm diameter and 60mm long. Shaft is 14mm. Out of an automatic sliding door like this one -> https://youtu.be/nKdHCjAEKuI?t=82 |
| Miyuki:
Induction motors are very robust I have from one manufacturer affirmed that I can use standard (50hz) rotor up to 400Hz safely and it is much bigger motors in 2kW (50Hz) > 10kW (400hz) / 7000rpm Dont this small one have just plastic fan ? Also this one look like a compact design with internal fan But agree some safety measures shall be applied |
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