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Tractorsport Flowbench Forum Archive • View topic - Source for Variacs

Source for Variacs

Discussion on general flowbench design

Postby LGHeath » Mon Jan 19, 2009 6:34 pm

[color=#000000]I have pretty much decided on a variac for motor control for the fine control of test depression and have looked through the forms and don
LGHeath
 
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Postby 2seater » Mon Jan 19, 2009 10:41 pm

I have a six motor bench and I use a router speed control on one motor only. It seems to do what I need. A Harbor Freight special, $15. I am sure the Variac is more elegant, but only if you can control several motorrs at the same time.

2seater
 
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Postby 49-1183904562 » Mon Jan 19, 2009 10:50 pm

Larry,

the model will work fine for 2 motors and will give you a little extra on top end as the variac will go to 130vac. Still not sure why you would use this over a $20 router speed controller.

I use a variac to test my motors but have found it not much better than a cheep Harbor Freight controller.

Rick
49-1183904562
 

Postby Tony » Tue Jan 20, 2009 2:04 am

A variac has one big advantage, it will not self destruct when a vacuum motor eventually blows up. Anything electronic is fragile, and if the motor dies, expect to have to replace the router speed controller as well. Every time.

A variac is so massive and huge, it can carry enormous brief overloads, until the fuse or circuit breaker protecting it turns off the power.

So basically one variac will last a lifetime. ANY cheap electronic controller is a disposable item.

A pretty good source for variacs is still e-bay in various countries.
Also known as the infamous "Warpspeed" on some other Forums.
Tony
 
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