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Invisiblemicro
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I really should know this (motors, torque, AC and Ohm)
    #21680948 - 05/14/15 10:01 PM (8 years, 8 months ago)

So, I have this hotplate stirrer I'm trying to use as a stirrer/pump but it's not putting out enough torque. It's big ass motor and says 20MHP. It also says "induction protection"" but I guess I'm talking about resistance here :\

The other rheostat for the heater isn't doing anything. If hook this in series with the stirrer rheostat to drive the motor, shouldn't the current go up (the speed will likely be reduced) and thus more torque?

I know it should work with DC but since this is 120V AC I figured I should check...


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Offlinegoldcaphunter
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Re: I really should know this (motors, torque, AC and Ohm) [Re: micro]
    #21691521 - 05/17/15 05:40 PM (8 years, 8 months ago)

Well just because the speed is reduced and current is increased doesn't necessarily mean torque increase.

What you're really looking for is probably the gearing ratio on the output side of the motor. Larger gears generally mean more rotating power, but alas in the end requires a larger current for the rotating Masssssss.

Your idea will likely work in theory, I'm just not sure about the ac vs DC situation to be honest

http://electronics.stackexchange.com/questions/64988/can-supplying-dc-power-into-an-ac-device-break-the-device

Good site for electrical stuffs


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Invisiblemicro
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Registered: 05/09/03
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Re: I really should know this (motors, torque, AC and Ohm) [Re: goldcaphunter]
    #21701922 - 05/20/15 10:38 AM (8 years, 8 months ago)

Thanks!

I had a bit of a brain-fart though.  That's the total power drawn from the circuit but won't increase the resistance of the motor unless you add another coil I don't think.

Besides, the thing wasn't working well anyway. It stirred but was LOUD (I added neodymium to compensate for the added distance) and the pump would be too much. I got new hotplate though, making bromine then ethyamine and then I'm going to play around with the grignard a bit to see if I can prevent at least as much of the carboxyl byproduct from forming and TRY to think of a way to mitigate the other stereo-hindered one. I also got stuff for methyamine by mistake because I was looking at the picture of K and not MXE >.<  There are two easy ways I could synth it from stuff here though. (well, two or three). I might use the compressor to dry and feed back the N2 above a certain pressure.

I got an air compressor from Walgreens that was cheap and I might do this under nitrogen anyway (not sure yet) but I have a professional vacuum system here I really could use, too. I just think it would be neat to have everything self-contained.

My distillation thermometer broke and I was about to try something with my aurduino crap when I realized one of my digital meters has a temperature sensor on it anyway XD (and looks pretty water/corrosion resistant).


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